Merging upstream version 0.1.33.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

23 files changed, 1625 insertions, 226 deletions

diff --git a/debputy/plugins/grantlee.json b/debputy/plugins/grantlee.json
new file mode 100644
index 0000000..00f63be
--- /dev/null
+++ b/debputy/plugins/grantlee.json
@@ -0,0 +1,4 @@
+{
+  "api-compat-version": 1,
+  "plugin-initializer": "initialize"
+}
diff --git a/debputy/plugins/grantlee.py b/debputy/plugins/grantlee.py
new file mode 100644
index 0000000..e804ce5
--- /dev/null
+++ b/debputy/plugins/grantlee.py
@@ -0,0 +1,62 @@
+import functools
+import os
+import re
+import subprocess
+from typing import Any, Optional
+
+from debputy.plugin.api import (
+    DebputyPluginInitializer,
+    BinaryCtrlAccessor,
+    PackageProcessingContext,
+    VirtualPath,
+)
+from debputy.util import _error
+
+
+_RE_GRANTLEE_VERSION = re.compile(r"^\d\.\d$")
+
+
+def initialize(api: DebputyPluginInitializer) -> None:
+    api.metadata_or_maintscript_detector(
+        "detect-grantlee-dependencies",
+        detect_grantlee_dependencies,
+    )
+
+
+def detect_grantlee_dependencies(
+    fs_root: VirtualPath,
+    ctrl: BinaryCtrlAccessor,
+    context: PackageProcessingContext,
+) -> None:
+    binary_package = context.binary_package
+    if binary_package.is_arch_all:
+        # Delta from dh_grantlee, but the MULTIARCH paths should not
+        # exist in arch:all packages
+        return
+    ma = binary_package.package_deb_architecture_variable("MULTIARCH")
+    grantlee_root_dirs = [
+        f"usr/lib/{ma}/grantlee",
+        f"usr/lib/{ma}/qt5/plugins/grantlee",
+    ]
+    grantee_version: Optional[str] = None
+    for grantlee_root_dir in grantlee_root_dirs:
+        grantlee_root_path = fs_root.lookup(grantlee_root_dir)
+        if grantlee_root_path is None or not grantlee_root_path.is_dir:
+            continue
+        # Delta: The original code recurses and then checks for "grantee/VERSION".
+        # Code here assumes that was just File::Find being used as a dir iterator.
+        for child in grantlee_root_path.iterdir:
+            if not _RE_GRANTLEE_VERSION.fullmatch(child.name):
+                continue
+            version = child.name
+            if grantee_version is not None and version != grantee_version:
+                _error(
+                    f"Package {binary_package.name} contains plugins for different grantlee versions"
+                )
+            grantee_version = version
+
+    if grantee_version is None:
+        return
+    dep_version = grantee_version.replace(".", "-")
+    grantee_dep = f"grantlee5-templates-{dep_version}"
+    ctrl.substvars["grantlee:Depends"] = grantee_dep
diff --git a/src/debputy/dh_migration/migrators_impl.py b/src/debputy/dh_migration/migrators_impl.py
index 2ceefd5..d68768c 100644
--- a/src/debputy/dh_migration/migrators_impl.py
+++ b/src/debputy/dh_migration/migrators_impl.py
@@ -231,6 +231,11 @@ DH_ADDONS_TO_PLUGINS = {
         remove_dh_sequence=False,
         must_use_zz_debputy=True,
     ),
+    "grantlee": DHSequenceMigration(
+        "grantlee",
+        remove_dh_sequence=True,
+        must_use_zz_debputy=True,
+    ),
     "numpy3": DHSequenceMigration(
         "numpy3",
         # The sequence provides (build-time) dependencies that we cannot provide
diff --git a/src/debputy/linting/lint_impl.py b/src/debputy/linting/lint_impl.py
index 81ce0e9..6ccf03d 100644
--- a/src/debputy/linting/lint_impl.py
+++ b/src/debputy/linting/lint_impl.py
@@ -6,24 +6,9 @@ import sys
 import textwrap
 from typing import Optional, List, Union, NoReturn, Mapping
 
-from debputy.filesystem_scan import FSROOverlay
-from debputy.lsp.vendoring._deb822_repro import Deb822FileElement
-from debputy.plugin.api import VirtualPath
-from debputy.yaml import MANIFEST_YAML, YAMLError
-from lsprotocol.types import (
-    CodeAction,
-    Command,
-    CodeActionParams,
-    CodeActionContext,
-    TextDocumentIdentifier,
-    TextEdit,
-    Position,
-    DiagnosticSeverity,
-    Diagnostic,
-)
-
 from debputy.commands.debputy_cmd.context import CommandContext
 from debputy.commands.debputy_cmd.output import _output_styling, OutputStylingBase
+from debputy.filesystem_scan import FSROOverlay
 from debputy.linting.lint_util import (
     report_diagnostic,
     LinterImpl,
@@ -41,6 +26,7 @@ from debputy.lsp.lsp_debian_copyright import (
     _reformat_debian_copyright,
 )
 from debputy.lsp.lsp_debian_debputy_manifest import _lint_debian_debputy_manifest
+from debputy.lsp.lsp_debian_patches_series import _lint_debian_patches_series
 from debputy.lsp.lsp_debian_rules import _lint_debian_rules_impl
 from debputy.lsp.lsp_debian_tests_control import (
     _lint_debian_tests_control,
@@ -59,10 +45,24 @@ from debputy.lsp.text_edit import (
     apply_text_edits,
     OverLappingTextEditException,
 )
+from debputy.lsp.vendoring._deb822_repro import Deb822FileElement
 from debputy.packages import SourcePackage, BinaryPackage
+from debputy.plugin.api import VirtualPath
 from debputy.plugin.api.feature_set import PluginProvidedFeatureSet
 from debputy.util import _warn, _error, _info
-from debputy.yaml.compat import CommentedMap, __all__
+from debputy.yaml import MANIFEST_YAML, YAMLError
+from debputy.yaml.compat import CommentedMap
+from lsprotocol.types import (
+    CodeAction,
+    Command,
+    CodeActionParams,
+    CodeActionContext,
+    TextDocumentIdentifier,
+    TextEdit,
+    Position,
+    DiagnosticSeverity,
+    Diagnostic,
+)
 
 LINTER_FORMATS = {
     "debian/changelog": _lint_debian_changelog,
@@ -70,6 +70,7 @@ LINTER_FORMATS = {
     "debian/copyright": _lint_debian_copyright,
     "debian/debputy.manifest": _lint_debian_debputy_manifest,
     "debian/rules": _lint_debian_rules_impl,
+    "debian/patches/series": _lint_debian_patches_series,
     "debian/tests/control": _lint_debian_tests_control,
 }
 
diff --git a/src/debputy/linting/lint_util.py b/src/debputy/linting/lint_util.py
index 78e9f9a..745d24c 100644
--- a/src/debputy/linting/lint_util.py
+++ b/src/debputy/linting/lint_util.py
@@ -1,16 +1,24 @@
 import dataclasses
 import os
-from typing import List, Optional, Callable, Counter, TYPE_CHECKING, Mapping, Sequence
-
-from lsprotocol.types import Position, Range, Diagnostic, DiagnosticSeverity, TextEdit
+from typing import (
+    List,
+    Optional,
+    Callable,
+    Counter,
+    TYPE_CHECKING,
+    Mapping,
+    Sequence,
+    cast,
+)
 
 from debputy.commands.debputy_cmd.output import OutputStylingBase
 from debputy.filesystem_scan import VirtualPathBase
+from debputy.lsp.diagnostics import LintSeverity
 from debputy.lsp.vendoring._deb822_repro import Deb822FileElement, parse_deb822_file
 from debputy.packages import SourcePackage, BinaryPackage
-from debputy.plugin.api import VirtualPath
 from debputy.plugin.api.feature_set import PluginProvidedFeatureSet
 from debputy.util import _DEFAULT_LOGGER, _warn
+from lsprotocol.types import Position, Range, Diagnostic, DiagnosticSeverity, TextEdit
 
 if TYPE_CHECKING:
     from debputy.lsp.text_util import LintCapablePositionCodec
@@ -158,26 +166,26 @@ LINTER_POSITION_CODEC = LinterPositionCodec()
 
 
 _SEVERITY2TAG = {
-    DiagnosticSeverity.Error: lambda fo: fo.colored(
-        "error",
+    DiagnosticSeverity.Error: lambda fo, lint_tag=None: fo.colored(
+        lint_tag if lint_tag else "error",
         fg="red",
         bg="black",
         style="bold",
     ),
-    DiagnosticSeverity.Warning: lambda fo: fo.colored(
-        "warning",
+    DiagnosticSeverity.Warning: lambda fo, lint_tag=None: fo.colored(
+        lint_tag if lint_tag else "warning",
         fg="yellow",
         bg="black",
         style="bold",
     ),
-    DiagnosticSeverity.Information: lambda fo: fo.colored(
-        "informational",
+    DiagnosticSeverity.Information: lambda fo, lint_tag=None: fo.colored(
+        lint_tag if lint_tag else "informational",
         fg="blue",
         bg="black",
         style="bold",
     ),
-    DiagnosticSeverity.Hint: lambda fo: fo.colored(
-        "pedantic",
+    DiagnosticSeverity.Hint: lambda fo, lint_tag=None: fo.colored(
+        lint_tag if lint_tag else "pedantic",
         fg="green",
         bg="black",
         style="bold",
@@ -231,12 +239,15 @@ def report_diagnostic(
         missing_severity = True
     if not auto_fixed:
         tag_unresolved = _SEVERITY2TAG.get(severity)
+        lint_tag: Optional[LintSeverity] = None
+        if isinstance(diagnostic.data, dict):
+            lint_tag = cast("LintSeverity", diagnostic.data.get("lint_severity"))
         if tag_unresolved is None:
             tag_unresolved = _SEVERITY2TAG[DiagnosticSeverity.Warning]
             lint_report.diagnostics_without_severity += 1
         else:
             lint_report.diagnostics_count[severity] += 1
-        tag = tag_unresolved(fo)
+        tag = tag_unresolved(fo, lint_tag)
     else:
         tag = fo.colored(
             "auto-fixing",
@@ -264,8 +275,13 @@ def report_diagnostic(
         # If it is fixed, there is no reason to show additional context.
         lint_report.fixed += 1
         return
+    if _is_file_level_diagnostic(
+        lines, start_line, start_position, end_line, end_position
+    ):
+        print(f"    File-level diagnostic")
+        return
     lines_to_print = _lines_to_print(diagnostic.range)
-    if diagnostic.range.end.line > len(lines) or diagnostic.range.start.line < 0:
+    if end_line > len(lines) or start_line < 0:
         lint_report.diagnostic_errors += 1
         _warn(
             "Bug in the underlying linter: The line numbers of the warning does not fit in the file..."
@@ -278,3 +294,18 @@ def report_diagnostic(
         for line_no in range(start_line, end_line):
             line = _highlight_range(fo, lines[line_no], line_no, diagnostic.range)
             print(f"    {line_no+1:{line_no_width}}: {line}")
+
+
+def _is_file_level_diagnostic(
+    lines: List[str],
+    start_line: int,
+    start_position: int,
+    end_line: int,
+    end_position: int,
+) -> bool:
+    if start_line != 0 or start_position != 0:
+        return False
+    line_count = len(lines)
+    if end_line + 1 == line_count and end_position == 0:
+        return True
+    return end_line == line_count and line_count and end_position == len(lines[-1])
diff --git a/src/debputy/lsp/diagnostics.py b/src/debputy/lsp/diagnostics.py
index 6e0b88a..5ae7ec5 100644
--- a/src/debputy/lsp/diagnostics.py
+++ b/src/debputy/lsp/diagnostics.py
@@ -1,6 +1,6 @@
 from typing import TypedDict, NotRequired, List, Any, Literal, Optional
 
-LintSeverity = Literal["style"]
+LintSeverity = Literal["spelling"]
 
 
 class DiagnosticData(TypedDict):
diff --git a/src/debputy/lsp/lsp_debian_control.py b/src/debputy/lsp/lsp_debian_control.py
index 699193c..ce92374 100644
--- a/src/debputy/lsp/lsp_debian_control.py
+++ b/src/debputy/lsp/lsp_debian_control.py
@@ -9,6 +9,7 @@ from typing import (
     Mapping,
     List,
     Dict,
+    Any,
 )
 
 from lsprotocol.types import (
@@ -43,6 +44,7 @@ from debputy.lsp.lsp_debian_control_reference_data import (
     DctrlFileMetadata,
     package_name_to_section,
     all_package_relationship_fields,
+    extract_first_value_and_position,
 )
 from debputy.lsp.lsp_features import (
     lint_diagnostics,
@@ -67,6 +69,7 @@ from debputy.lsp.quickfixes import (
     range_compatible_with_remove_line_fix,
     propose_correct_text_quick_fix,
     propose_insert_text_on_line_after_diagnostic_quick_fix,
+    propose_remove_range_quick_fix,
 )
 from debputy.lsp.spellchecking import default_spellchecker
 from debputy.lsp.text_util import (
@@ -82,6 +85,8 @@ from debputy.lsp.vendoring._deb822_repro import (
 from debputy.lsp.vendoring._deb822_repro.parsing import (
     Deb822KeyValuePairElement,
     LIST_SPACE_SEPARATED_INTERPRETATION,
+    Interpretation,
+    Deb822ParsedTokenList,
 )
 
 try:
@@ -414,30 +419,46 @@ def _paragraph_representation_field(
     return next(iter(paragraph.iter_parts_of_type(Deb822KeyValuePairElement)))
 
 
-def _extract_first_value_and_position(
-    kvpair: Deb822KeyValuePairElement,
-    stanza_pos: "TEPosition",
-    position_codec: "LintCapablePositionCodec",
-    lines: List[str],
-) -> Tuple[Optional[str], Optional[Range]]:
-    kvpair_pos = kvpair.position_in_parent().relative_to(stanza_pos)
-    value_element_pos = kvpair.value_element.position_in_parent().relative_to(
-        kvpair_pos
-    )
-    for value_ref in kvpair.interpret_as(
-        LIST_SPACE_SEPARATED_INTERPRETATION
-    ).iter_value_references():
-        v = value_ref.value
-        section_value_loc = value_ref.locatable
-        value_range_te = section_value_loc.range_in_parent().relative_to(
-            value_element_pos
+def _source_package_checks(
+    stanza: Deb822ParagraphElement,
+    stanza_position: "TEPosition",
+    lint_state: LintState,
+    diagnostics: List[Diagnostic],
+) -> None:
+    vcs_fields = {}
+    for kvpair in stanza.iter_parts_of_type(Deb822KeyValuePairElement):
+        name = normalize_dctrl_field_name(kvpair.field_name.lower())
+        if (
+            not name.startswith("vcs-")
+            or name == "vcs-browser"
+            or name not in SOURCE_FIELDS
+        ):
+            continue
+        vcs_fields[name] = kvpair
+
+    if len(vcs_fields) < 2:
+        return
+    for kvpair in vcs_fields.values():
+        kvpair_range_server_units = te_range_to_lsp(
+            kvpair.range_in_parent().relative_to(stanza_position)
         )
-        section_range_server_units = te_range_to_lsp(value_range_te)
-        section_range = position_codec.range_to_client_units(
-            lines, section_range_server_units
+        diagnostics.append(
+            Diagnostic(
+                lint_state.position_codec.range_to_client_units(
+                    lint_state.lines, kvpair_range_server_units
+                ),
+                f'Multiple Version Control fields defined ("{kvpair.field_name}")',
+                severity=DiagnosticSeverity.Warning,
+                source="debputy",
+                data=DiagnosticData(
+                    quickfixes=[
+                        propose_remove_range_quick_fix(
+                            proposed_title=f'Remove "{kvpair.field_name}"'
+                        )
+                    ]
+                ),
+            )
         )
-        return v, section_range
-    return None, None
 
 
 def _binary_package_checks(
@@ -445,8 +466,7 @@ def _binary_package_checks(
     stanza_position: "TEPosition",
     source_stanza: Deb822ParagraphElement,
     representation_field_range: Range,
-    position_codec: "LintCapablePositionCodec",
-    lines: List[str],
+    lint_state: LintState,
     diagnostics: List[Diagnostic],
 ) -> None:
     package_name = stanza.get("Package", "")
@@ -454,11 +474,10 @@ def _binary_package_checks(
     section_kvpair = stanza.get_kvpair_element("Section", use_get=True)
     section: Optional[str] = None
     if section_kvpair is not None:
-        section, section_range = _extract_first_value_and_position(
+        section, section_range = extract_first_value_and_position(
             section_kvpair,
             stanza_position,
-            position_codec,
-            lines,
+            lint_state,
         )
     else:
         section_range = representation_field_range
@@ -476,11 +495,10 @@ def _binary_package_checks(
             )
             package_type_range = None
             if package_type_kvpair is not None:
-                _, package_type_range = _extract_first_value_and_position(
+                _, package_type_range = extract_first_value_and_position(
                     package_type_kvpair,
                     stanza_position,
-                    position_codec,
-                    lines,
+                    lint_state,
                 )
             if package_type_range is None:
                 package_type_range = representation_field_range
@@ -528,16 +546,15 @@ def _diagnostics_for_paragraph(
     other_known_fields: Mapping[str, DctrlKnownField],
     is_binary_paragraph: bool,
     doc_reference: str,
-    position_codec: "LintCapablePositionCodec",
-    lines: List[str],
+    lint_state: LintState,
     diagnostics: List[Diagnostic],
 ) -> None:
     representation_field = _paragraph_representation_field(stanza)
     representation_field_range = representation_field.range_in_parent().relative_to(
         stanza_position
     )
-    representation_field_range = position_codec.range_to_client_units(
-        lines,
+    representation_field_range = lint_state.position_codec.range_to_client_units(
+        lint_state.lines,
         te_range_to_lsp(representation_field_range),
     )
     for known_field in known_fields.values():
@@ -563,8 +580,14 @@ def _diagnostics_for_paragraph(
             stanza_position,
             source_stanza,
             representation_field_range,
-            position_codec,
-            lines,
+            lint_state,
+            diagnostics,
+        )
+    else:
+        _source_package_checks(
+            stanza,
+            stanza_position,
+            lint_state,
             diagnostics,
         )
 
@@ -583,8 +606,8 @@ def _diagnostics_for_paragraph(
         )
         field_position_te = field_range_te.start_pos
         field_range_server_units = te_range_to_lsp(field_range_te)
-        field_range = position_codec.range_to_client_units(
-            lines,
+        field_range = lint_state.position_codec.range_to_client_units(
+            lint_state.lines,
             field_range_server_units,
         )
         field_name_typo_detected = False
@@ -609,8 +632,8 @@ def _diagnostics_for_paragraph(
                         field_position_te, kvpair.field_token.size()
                     )
                 )
-                field_range = position_codec.range_to_client_units(
-                    lines,
+                field_range = lint_state.position_codec.range_to_client_units(
+                    lint_state.lines,
                     token_range_server_units,
                 )
                 field_name_typo_detected = True
@@ -659,8 +682,7 @@ def _diagnostics_for_paragraph(
                 stanza,
                 stanza_position,
                 kvpair_position,
-                position_codec,
-                lines,
+                lint_state,
                 field_name_typo_reported=field_name_typo_detected,
             )
         )
@@ -689,8 +711,8 @@ def _diagnostics_for_paragraph(
                     word_range_server_units = te_range_to_lsp(
                         TERange.from_position_and_size(word_pos_te, word_range_te)
                     )
-                    word_range = position_codec.range_to_client_units(
-                        lines,
+                    word_range = lint_state.position_codec.range_to_client_units(
+                        lint_state.lines,
                         word_range_server_units,
                     )
                     diagnostics.append(
@@ -700,10 +722,11 @@ def _diagnostics_for_paragraph(
                             severity=DiagnosticSeverity.Hint,
                             source="debputy",
                             data=DiagnosticData(
+                                lint_severity="spelling",
                                 quickfixes=[
                                     propose_correct_text_quick_fix(c)
                                     for c in corrections
-                                ]
+                                ],
                             ),
                         )
                     )
@@ -827,9 +850,10 @@ def _scan_for_syntax_errors_and_token_level_diagnostics(
                         severity=DiagnosticSeverity.Hint,
                         source="debputy",
                         data=DiagnosticData(
+                            lint_severity="spelling",
                             quickfixes=[
                                 propose_correct_text_quick_fix(c) for c in corrections
-                            ]
+                            ],
                         ),
                     )
                 )
@@ -875,8 +899,7 @@ def _lint_debian_control(
             other_known_fields,
             is_binary_paragraph,
             doc_reference,
-            position_codec,
-            lines,
+            lint_state,
             diagnostics,
         )
 
diff --git a/src/debputy/lsp/lsp_debian_control_reference_data.py b/src/debputy/lsp/lsp_debian_control_reference_data.py
index bd2a43d..5b2e5f3 100644
--- a/src/debputy/lsp/lsp_debian_control_reference_data.py
+++ b/src/debputy/lsp/lsp_debian_control_reference_data.py
@@ -28,7 +28,7 @@ from typing import (
 from debputy.filesystem_scan import VirtualPathBase
 from debputy.linting.lint_util import LintState
 from debputy.lsp.vendoring._deb822_repro.types import TE
-from debian.debian_support import DpkgArchTable
+from debian.debian_support import DpkgArchTable, Version
 from lsprotocol.types import (
     DiagnosticSeverity,
     Diagnostic,
@@ -52,6 +52,7 @@ from debputy.lsp.lsp_reference_keyword import (
 from debputy.lsp.quickfixes import (
     propose_correct_text_quick_fix,
     propose_remove_line_quick_fix,
+    propose_remove_range_quick_fix,
 )
 from debputy.lsp.text_edit import apply_text_edits
 from debputy.lsp.text_util import (
@@ -86,6 +87,7 @@ from debputy.lsp.vendoring._deb822_repro.tokens import (
 )
 from debputy.lsp.vendoring._deb822_repro.types import FormatterCallback
 from debputy.lsp.vendoring.wrap_and_sort import _sort_packages_key
+from debputy.path_matcher import BasenameGlobMatch
 from debputy.plugin.api import VirtualPath
 from debputy.util import PKGNAME_REGEX, _info
 
@@ -109,6 +111,8 @@ S = TypeVar("S", bound="StanzaMetadata")
 
 # FIXME: should go into python3-debian
 _RE_COMMA = re.compile("([^,]*),([^,]*)")
+_RE_SV = re.compile(r"(\d+[.]\d+[.]\d+)([.]\d+)?")
+CURRENT_STANDARDS_VERSION = Version("4.7.0")
 
 
 @_value_line_tokenizer
@@ -151,8 +155,7 @@ CustomFieldCheck = Callable[
         "TERange",
         Deb822ParagraphElement,
         "TEPosition",
-        "LintCapablePositionCodec",
-        List[str],
+        LintState,
     ],
     Iterable[Diagnostic],
 ]
@@ -389,49 +392,105 @@ def dpkg_arch_and_wildcards() -> FrozenSet[Union[str, Keyword]]:
     return frozenset(all_architectures_and_wildcards(dpkg_arch_table._arch2table))
 
 
-def _extract_first_value_and_position(
+def extract_first_value_and_position(
     kvpair: Deb822KeyValuePairElement,
     stanza_pos: "TEPosition",
-    position_codec: "LintCapablePositionCodec",
-    lines: List[str],
+    lint_state: LintState,
+    *,
+    interpretation: Interpretation[
+        Deb822ParsedTokenList[Any, Any]
+    ] = LIST_SPACE_SEPARATED_INTERPRETATION,
 ) -> Tuple[Optional[str], Optional[Range]]:
     kvpair_pos = kvpair.position_in_parent().relative_to(stanza_pos)
     value_element_pos = kvpair.value_element.position_in_parent().relative_to(
         kvpair_pos
     )
-    for value_ref in kvpair.interpret_as(
-        LIST_SPACE_SEPARATED_INTERPRETATION
-    ).iter_value_references():
+    for value_ref in kvpair.interpret_as(interpretation).iter_value_references():
         v = value_ref.value
         section_value_loc = value_ref.locatable
         value_range_te = section_value_loc.range_in_parent().relative_to(
             value_element_pos
         )
-        value_range_server_units = te_range_to_lsp(value_range_te)
-        value_range = position_codec.range_to_client_units(
-            lines, value_range_server_units
+        section_range_server_units = te_range_to_lsp(value_range_te)
+        section_range = lint_state.position_codec.range_to_client_units(
+            lint_state.lines,
+            section_range_server_units,
         )
-        return v, value_range
+        return v, section_range
     return None, None
 
 
+def _sv_field_validation(
+    _known_field: "F",
+    kvpair: Deb822KeyValuePairElement,
+    _field_range: "TERange",
+    _stanza: Deb822ParagraphElement,
+    stanza_position: "TEPosition",
+    lint_state: LintState,
+) -> Iterable[Diagnostic]:
+    sv_value, sv_value_range = extract_first_value_and_position(
+        kvpair,
+        stanza_position,
+        lint_state,
+    )
+    m = _RE_SV.fullmatch(sv_value)
+    if m is None:
+        yield Diagnostic(
+            sv_value_range,
+            f'Not a valid version. Current version is "{CURRENT_STANDARDS_VERSION}"',
+            severity=DiagnosticSeverity.Warning,
+            source="debputy",
+        )
+        return
+
+    sv_version = Version(sv_value)
+    if sv_version < CURRENT_STANDARDS_VERSION:
+        yield Diagnostic(
+            sv_value_range,
+            f"Latest Standards-Version is {CURRENT_STANDARDS_VERSION}",
+            severity=DiagnosticSeverity.Information,
+            source="debputy",
+        )
+        return
+    extra = m.group(2)
+    if extra:
+        extra_len = lint_state.position_codec.client_num_units(extra)
+        yield Diagnostic(
+            Range(
+                Position(
+                    sv_value_range.end.line,
+                    sv_value_range.end.character - extra_len,
+                ),
+                sv_value_range.end,
+            ),
+            "Unnecessary version segment. This part of the version is only used for editorial changes",
+            severity=DiagnosticSeverity.Information,
+            source="debputy",
+            data=DiagnosticData(
+                quickfixes=[
+                    propose_remove_range_quick_fix(
+                        proposed_title="Remove unnecessary version part"
+                    )
+                ]
+            ),
+        )
+
+
 def _dctrl_ma_field_validation(
     _known_field: "F",
     _kvpair: Deb822KeyValuePairElement,
     _field_range: "TERange",
     stanza: Deb822ParagraphElement,
     stanza_position: "TEPosition",
-    position_codec: "LintCapablePositionCodec",
-    lines: List[str],
+    lint_state: LintState,
 ) -> Iterable[Diagnostic]:
     ma_kvpair = stanza.get_kvpair_element("Multi-Arch", use_get=True)
     arch = stanza.get("Architecture", "any")
     if arch == "all" and ma_kvpair is not None:
-        ma_value, ma_value_range = _extract_first_value_and_position(
+        ma_value, ma_value_range = extract_first_value_and_position(
             ma_kvpair,
             stanza_position,
-            position_codec,
-            lines,
+            lint_state,
         )
         if ma_value == "same":
             yield Diagnostic(
@@ -448,14 +507,13 @@ def _udeb_only_field_validation(
     field_range_te: "TERange",
     stanza: Deb822ParagraphElement,
     _stanza_position: "TEPosition",
-    position_codec: "LintCapablePositionCodec",
-    lines: List[str],
+    lint_state: LintState,
 ) -> Iterable[Diagnostic]:
     package_type = stanza.get("Package-Type")
     if package_type != "udeb":
         field_range_server_units = te_range_to_lsp(field_range_te)
-        field_range = position_codec.range_to_client_units(
-            lines,
+        field_range = lint_state.position_codec.range_to_client_units(
+            lint_state.lines,
             field_range_server_units,
         )
         yield Diagnostic(
@@ -495,14 +553,13 @@ def _arch_not_all_only_field_validation(
     field_range_te: "TERange",
     stanza: Deb822ParagraphElement,
     _stanza_position: "TEPosition",
-    position_codec: "LintCapablePositionCodec",
-    lines: List[str],
+    lint_state: LintState,
 ) -> Iterable[Diagnostic]:
     architecture = stanza.get("Architecture")
     if architecture == "all":
         field_range_server_units = te_range_to_lsp(field_range_te)
-        field_range = position_codec.range_to_client_units(
-            lines,
+        field_range = lint_state.position_codec.range_to_client_units(
+            lint_state.lines,
             field_range_server_units,
         )
         yield Diagnostic(
@@ -525,8 +582,7 @@ def _each_value_match_regex_validation(
         field_range_te: "TERange",
         _stanza: Deb822ParagraphElement,
         _stanza_position: "TEPosition",
-        position_codec: "LintCapablePositionCodec",
-        lines: List[str],
+        lint_state: LintState,
     ) -> Iterable[Diagnostic]:
 
         value_element_pos = kvpair.value_element.position_in_parent().relative_to(
@@ -545,8 +601,8 @@ def _each_value_match_regex_validation(
                 value_element_pos
             )
             value_range_server_units = te_range_to_lsp(value_range_te)
-            value_range = position_codec.range_to_client_units(
-                lines, value_range_server_units
+            value_range = lint_state.position_codec.range_to_client_units(
+                lint_state.lines, value_range_server_units
             )
             yield Diagnostic(
                 value_range,
@@ -558,6 +614,129 @@ def _each_value_match_regex_validation(
     return _validator
 
 
+class Dep5Matcher(BasenameGlobMatch):
+    def __init__(self, basename_glob: str) -> None:
+        super().__init__(
+            basename_glob,
+            only_when_in_directory=None,
+            path_type=None,
+            recursive_match=False,
+        )
+
+
+def _match_dep5_segment(
+    current_dir: VirtualPathBase, basename_glob: str
+) -> Iterable[VirtualPathBase]:
+    if "*" in basename_glob or "?" in basename_glob:
+        return Dep5Matcher(basename_glob).finditer(current_dir)
+    else:
+        res = current_dir.get(basename_glob)
+        if res is None:
+            return tuple()
+        return (res,)
+
+
+_RE_SLASHES = re.compile(r"//+")
+
+
+def _dep5_unnecessary_symbols(
+    value: str,
+    value_range: TERange,
+    lint_state: LintState,
+) -> Iterable[Diagnostic]:
+    slash_check_index = 0
+    if value.startswith(("./", "/")):
+        prefix_len = 1 if value[0] == "/" else 2
+        if value[prefix_len - 1 : prefix_len + 2].startswith("//"):
+            _, slashes_end = _RE_SLASHES.search(value).span()
+            prefix_len = slashes_end
+
+        slash_check_index = prefix_len
+        prefix_range = te_range_to_lsp(
+            TERange(
+                value_range.start_pos,
+                TEPosition(
+                    value_range.start_pos.line_position,
+                    value_range.start_pos.cursor_position + prefix_len,
+                ),
+            )
+        )
+        yield Diagnostic(
+            lint_state.position_codec.range_to_client_units(
+                lint_state.lines,
+                prefix_range,
+            ),
+            f'Unnecessary prefix "{value[0:prefix_len]}"',
+            DiagnosticSeverity.Warning,
+            source="debputy",
+            data=DiagnosticData(
+                quickfixes=[
+                    propose_remove_range_quick_fix(
+                        proposed_title=f'Delete "{value[0:prefix_len]}"'
+                    )
+                ]
+            ),
+        )
+
+    for m in _RE_SLASHES.finditer(value, slash_check_index):
+        m_start, m_end = m.span(0)
+
+        prefix_range = te_range_to_lsp(
+            TERange(
+                TEPosition(
+                    value_range.start_pos.line_position,
+                    value_range.start_pos.cursor_position + m_start,
+                ),
+                TEPosition(
+                    value_range.start_pos.line_position,
+                    value_range.start_pos.cursor_position + m_end,
+                ),
+            )
+        )
+        yield Diagnostic(
+            lint_state.position_codec.range_to_client_units(
+                lint_state.lines,
+                prefix_range,
+            ),
+            'Simplify to a single "/"',
+            DiagnosticSeverity.Warning,
+            source="debputy",
+            data=DiagnosticData(quickfixes=[propose_correct_text_quick_fix("/")]),
+        )
+
+
+def _dep5_files_check(
+    known_field: "F",
+    kvpair: Deb822KeyValuePairElement,
+    field_range_te: "TERange",
+    _stanza: Deb822ParagraphElement,
+    _stanza_position: "TEPosition",
+    lint_state: LintState,
+) -> Iterable[Diagnostic]:
+    interpreter = known_field.field_value_class.interpreter()
+    assert interpreter is not None
+    full_value_range = kvpair.value_element.range_in_parent().relative_to(
+        field_range_te.start_pos
+    )
+    values_with_ranges = []
+    for value_ref in kvpair.interpret_as(interpreter).iter_value_references():
+        value_range = value_ref.locatable.range_in_parent().relative_to(
+            full_value_range.start_pos
+        )
+        value = value_ref.value
+        values_with_ranges.append((value_ref.value, value_range))
+        yield from _dep5_unnecessary_symbols(value, value_range, lint_state)
+
+    source_root = lint_state.source_root
+    if source_root is None:
+        return
+    i = 0
+    limit = len(values_with_ranges)
+    while i < limit:
+        value, value_range = values_with_ranges[i]
+        i += 1
+
+
 def _combined_custom_field_check(*checks: CustomFieldCheck) -> CustomFieldCheck:
     def _validator(
         known_field: "F",
@@ -565,8 +744,7 @@ def _combined_custom_field_check(*checks: CustomFieldCheck) -> CustomFieldCheck:
         field_range_te: "TERange",
         stanza: Deb822ParagraphElement,
         stanza_position: "TEPosition",
-        position_codec: "LintCapablePositionCodec",
-        lines: List[str],
+        lint_state: LintState,
     ) -> Iterable[Diagnostic]:
         for check in checks:
             yield from check(
@@ -575,8 +753,7 @@ def _combined_custom_field_check(*checks: CustomFieldCheck) -> CustomFieldCheck:
                 field_range_te,
                 stanza,
                 stanza_position,
-                position_codec,
-                lines,
+                lint_state,
             )
 
     return _validator
@@ -1039,8 +1216,7 @@ class Deb822KnownField:
         stanza: Deb822ParagraphElement,
         stanza_position: "TEPosition",
         kvpair_position: "TEPosition",
-        position_codec: "LintCapablePositionCodec",
-        lines: List[str],
+        lint_state: LintState,
         *,
         field_name_typo_reported: bool = False,
     ) -> Iterable[Diagnostic]:
@@ -1052,8 +1228,7 @@ class Deb822KnownField:
             field_name_token,
             field_range_te,
             field_name_typo_reported,
-            position_codec,
-            lines,
+            lint_state,
         )
         if self.custom_field_check is not None:
             yield from self.custom_field_check(
@@ -1062,15 +1237,13 @@ class Deb822KnownField:
                 field_range_te,
                 stanza,
                 stanza_position,
-                position_codec,
-                lines,
+                lint_state,
             )
         if not self.spellcheck_value:
             yield from self._known_value_diagnostics(
                 kvpair,
                 kvpair_position,
-                position_codec,
-                lines,
+                lint_state,
             )
 
     def _diagnostics_for_field_name(
@@ -1078,15 +1251,14 @@ class Deb822KnownField:
         token: Deb822FieldNameToken,
         token_range: "TERange",
         typo_detected: bool,
-        position_codec: "LintCapablePositionCodec",
-        lines: List[str],
+        lint_state: LintState,
     ) -> Iterable[Diagnostic]:
         field_name = token.text
         # Defeat the case-insensitivity from python-debian
         field_name_cased = str(field_name)
         token_range_server_units = te_range_to_lsp(token_range)
-        token_range = position_codec.range_to_client_units(
-            lines,
+        token_range = lint_state.position_codec.range_to_client_units(
+            lint_state.lines,
             token_range_server_units,
         )
         if self.deprecated_with_no_replacement:
@@ -1125,8 +1297,7 @@ class Deb822KnownField:
         self,
         kvpair: Deb822KeyValuePairElement,
         kvpair_position: "TEPosition",
-        position_codec: "LintCapablePositionCodec",
-        lines: List[str],
+        lint_state: LintState,
     ) -> Iterable[Diagnostic]:
         unknown_value_severity = self.unknown_value_diagnostic_severity
         interpreter = self.field_value_class.interpreter()
@@ -1146,8 +1317,8 @@ class Deb822KnownField:
                 continue
             if last_token_non_ws_sep_token is not None:
                 sep_range_te = token.range_in_parent().relative_to(value_off)
-                value_range = position_codec.range_to_client_units(
-                    lines,
+                value_range = lint_state.position_codec.range_to_client_units(
+                    lint_state.lines,
                     te_range_to_lsp(sep_range_te),
                 )
                 yield Diagnostic(
@@ -1176,8 +1347,8 @@ class Deb822KnownField:
                 value_loc = value_ref.locatable
                 range_position_te = value_loc.range_in_parent().relative_to(value_off)
                 value_range_in_server_units = te_range_to_lsp(range_position_te)
-                value_range = position_codec.range_to_client_units(
-                    lines,
+                value_range = lint_state.position_codec.range_to_client_units(
+                    lint_state.lines,
                     value_range_in_server_units,
                 )
                 yield Diagnostic(
@@ -1194,8 +1365,8 @@ class Deb822KnownField:
                 value_loc = first_exclusive_value_ref.locatable
                 value_range_te = value_loc.range_in_parent().relative_to(value_off)
                 value_range_in_server_units = te_range_to_lsp(value_range_te)
-                value_range = position_codec.range_to_client_units(
-                    lines,
+                value_range = lint_state.position_codec.range_to_client_units(
+                    lint_state.lines,
                     value_range_in_server_units,
                 )
                 yield Diagnostic(
@@ -1272,8 +1443,8 @@ class Deb822KnownField:
             value_loc = value_ref.locatable
             value_range_te = value_loc.range_in_parent().relative_to(value_off)
             value_range_in_server_units = te_range_to_lsp(value_range_te)
-            value_range = position_codec.range_to_client_units(
-                lines,
+            value_range = lint_state.position_codec.range_to_client_units(
+                lint_state.lines,
                 value_range_in_server_units,
             )
             yield from (Diagnostic(value_range, **issue_data) for issue_data in issues)
@@ -1473,6 +1644,7 @@ SOURCE_FIELDS = _fields(
         "Standards-Version",
         FieldValueClass.SINGLE_VALUE,
         missing_field_severity=DiagnosticSeverity.Error,
+        custom_field_check=_sv_field_validation,
         synopsis_doc="Debian Policy version this package complies with",
         hover_text=textwrap.dedent(
             """\
@@ -2328,7 +2500,7 @@ BINARY_FIELDS = _fields(
                 **Example**:
                 ```
                 Package: foo
-                Provide: debputy-plugin-foo
+                Provides: debputy-plugin-foo
                 Enhances: debputy
                 ```
             """
@@ -3129,6 +3301,7 @@ _DEP5_FILES_FIELDS = _fields(
         "Files",
         FieldValueClass.DEP5_FILE_LIST,
         is_stanza_name=True,
+        custom_field_check=_dep5_files_check,
         missing_field_severity=DiagnosticSeverity.Error,
         hover_text=textwrap.dedent(
             """\
diff --git a/src/debputy/lsp/lsp_debian_copyright.py b/src/debputy/lsp/lsp_debian_copyright.py
index 843627e..5895669 100644
--- a/src/debputy/lsp/lsp_debian_copyright.py
+++ b/src/debputy/lsp/lsp_debian_copyright.py
@@ -142,8 +142,7 @@ def _diagnostics_for_paragraph(
     other_known_fields: Mapping[str, Deb822KnownField],
     is_files_or_license_paragraph: bool,
     doc_reference: str,
-    position_codec: "LintCapablePositionCodec",
-    lines: List[str],
+    lint_state: LintState,
     diagnostics: List[Diagnostic],
 ) -> None:
     representation_field = _paragraph_representation_field(stanza)
@@ -155,8 +154,8 @@ def _diagnostics_for_paragraph(
             representation_field_pos, representation_field.size()
         )
     )
-    representation_field_range = position_codec.range_to_client_units(
-        lines,
+    representation_field_range = lint_state.position_codec.range_to_client_units(
+        lint_state.lines,
         representation_field_range_server_units,
     )
     for known_field in known_fields.values():
@@ -188,8 +187,8 @@ def _diagnostics_for_paragraph(
         )
         field_position_te = field_range_te.start_pos
         field_range_server_units = te_range_to_lsp(field_range_te)
-        field_range = position_codec.range_to_client_units(
-            lines,
+        field_range = lint_state.position_codec.range_to_client_units(
+            lint_state.lines,
             field_range_server_units,
         )
         field_name_typo_detected = False
@@ -214,8 +213,8 @@ def _diagnostics_for_paragraph(
                         field_position_te, kvpair.field_token.size()
                     )
                 )
-                field_range = position_codec.range_to_client_units(
-                    lines,
+                field_range = lint_state.position_codec.range_to_client_units(
+                    lint_state.lines,
                     token_range_server_units,
                 )
                 field_name_typo_detected = True
@@ -266,8 +265,7 @@ def _diagnostics_for_paragraph(
                 stanza,
                 stanza_position,
                 kvpair_position,
-                position_codec,
-                lines,
+                lint_state,
                 field_name_typo_reported=field_name_typo_detected,
             )
         )
@@ -296,8 +294,8 @@ def _diagnostics_for_paragraph(
                     word_range_server_units = te_range_to_lsp(
                         TERange.from_position_and_size(word_pos_te, word_range_te)
                     )
-                    word_range = position_codec.range_to_client_units(
-                        lines,
+                    word_range = lint_state.position_codec.range_to_client_units(
+                        lint_state.lines,
                         word_range_server_units,
                     )
                     diagnostics.append(
@@ -307,10 +305,11 @@ def _diagnostics_for_paragraph(
                             severity=DiagnosticSeverity.Hint,
                             source="debputy",
                             data=DiagnosticData(
+                                lint_severity="spelling",
                                 quickfixes=[
                                     propose_correct_text_quick_fix(c)
                                     for c in corrections
-                                ]
+                                ],
                             ),
                         )
                     )
@@ -418,9 +417,10 @@ def _scan_for_syntax_errors_and_token_level_diagnostics(
                         severity=DiagnosticSeverity.Hint,
                         source="debputy",
                         data=DiagnosticData(
+                            lint_severity="spelling",
                             quickfixes=[
                                 propose_correct_text_quick_fix(c) for c in corrections
-                            ]
+                            ],
                         ),
                     )
                 )
@@ -470,8 +470,7 @@ def _lint_debian_copyright(
             other_known_fields,
             is_files_or_license_paragraph,
             doc_reference,
-            position_codec,
-            lines,
+            lint_state,
             diagnostics,
         )
     if not is_dep5:
diff --git a/src/debputy/lsp/lsp_debian_patches_series.py b/src/debputy/lsp/lsp_debian_patches_series.py
new file mode 100644
index 0000000..c703e37
--- /dev/null
+++ b/src/debputy/lsp/lsp_debian_patches_series.py
@@ -0,0 +1,454 @@
+import itertools
+import re
+from typing import (
+    Union,
+    Sequence,
+    Optional,
+    Iterable,
+    List,
+    Mapping,
+)
+
+from debputy.filesystem_scan import VirtualPathBase
+from debputy.linting.lint_util import LintState
+from debputy.lsp.debputy_ls import DebputyLanguageServer
+from debputy.lsp.diagnostics import DiagnosticData
+from debputy.lsp.lsp_features import (
+    lint_diagnostics,
+    lsp_standard_handler,
+    lsp_completer,
+    lsp_semantic_tokens_full,
+    SEMANTIC_TOKEN_TYPES_IDS,
+)
+from debputy.lsp.quickfixes import (
+    propose_remove_range_quick_fix,
+    propose_correct_text_quick_fix,
+)
+from debputy.lsp.text_util import (
+    SemanticTokensState,
+)
+from lsprotocol.types import (
+    CompletionItem,
+    Diagnostic,
+    CompletionList,
+    CompletionParams,
+    TEXT_DOCUMENT_WILL_SAVE_WAIT_UNTIL,
+    SemanticTokensParams,
+    SemanticTokens,
+    SemanticTokenTypes,
+    Position,
+    Range,
+    DiagnosticSeverity,
+    CompletionItemKind,
+    CompletionItemLabelDetails,
+)
+
+try:
+    from debputy.lsp.vendoring._deb822_repro.locatable import (
+        Position as TEPosition,
+        Range as TERange,
+        START_POSITION,
+    )
+
+    from pygls.server import LanguageServer
+    from pygls.workspace import TextDocument
+except ImportError:
+    pass
+
+
+_LANGUAGE_IDS = [
+    "debian/patches/series",
+    # quilt path name
+    "patches/series",
+]
+
+
+def _as_hook_targets(command_name: str) -> Iterable[str]:
+    for prefix, suffix in itertools.product(
+        ["override_", "execute_before_", "execute_after_"],
+        ["", "-arch", "-indep"],
+    ):
+        yield f"{prefix}{command_name}{suffix}"
+
+
+# lsp_standard_handler(_LANGUAGE_IDS, TEXT_DOCUMENT_CODE_ACTION)
+lsp_standard_handler(_LANGUAGE_IDS, TEXT_DOCUMENT_WILL_SAVE_WAIT_UNTIL)
+
+_RE_LINE_COMMENT = re.compile(r"^\s*(#(?:.*\S)?)\s*$")
+_RE_PATCH_LINE = re.compile(
+    r"""
+    ^  \s* (?P<patch_name> \S+ ) \s*
+       (?: (?P<options> [^#\s]+ ) \s* )?
+       (?: (?P<comment> \# (?:.*\S)? ) \s* )?
+""",
+    re.VERBOSE,
+)
+_RE_UNNECESSARY_LEADING_PREFIX = re.compile(r"(?:(?:[.]{1,2})?/+)+")
+_RE_UNNECESSARY_SLASHES = re.compile("//+")
+
+
+def is_valid_file(path: str) -> bool:
+    return path.endswith("/patches/series")
+
+
+def _all_patch_files(
+    debian_patches: VirtualPathBase,
+) -> Iterable[VirtualPathBase]:
+    if not debian_patches.is_dir:
+        return
+
+    for patch_file in debian_patches.all_paths():
+        if patch_file.is_dir or patch_file.path in (
+            "debian/patches/series",
+            "./debian/patches/series",
+        ):
+            continue
+
+        if patch_file.name.endswith("~"):
+            continue
+        if patch_file.name.startswith((".#", "#")):
+            continue
+        parent = patch_file.parent_dir
+        if (
+            parent is not None
+            and parent.path in ("debian/patches", "./debian/patches")
+            and patch_file.name.endswith(".series")
+        ):
+            continue
+        yield patch_file
+
+
+def _listed_patches(
+    lines: List[str],
+) -> Iterable[str]:
+    for line in lines:
+        m = _RE_PATCH_LINE.match(line)
+        if m is None:
+            continue
+        filename = m.group(1)
+        if filename.startswith("#"):
+            continue
+        filename = _RE_UNNECESSARY_LEADING_PREFIX.sub("", filename, count=1)
+        filename = _RE_UNNECESSARY_SLASHES.sub("/", filename)
+        if not filename:
+            continue
+        yield filename
+
+
+@lint_diagnostics(_LANGUAGE_IDS)
+def _lint_debian_patches_series(lint_state: LintState) -> Optional[List[Diagnostic]]:
+    if not is_valid_file(lint_state.path):
+        return None
+
+    source_root = lint_state.source_root
+    if source_root is None:
+        return None
+
+    dpatches = source_root.lookup("debian/patches/")
+    if dpatches is None or not dpatches.is_dir:
+        return None
+
+    position_codec = lint_state.position_codec
+    diagnostics = []
+    used_patches = set()
+    all_patches = {pf.path for pf in _all_patch_files(dpatches)}
+
+    for line_no, line in enumerate(lint_state.lines):
+        m = _RE_PATCH_LINE.match(line)
+        if not m:
+            continue
+        groups = m.groupdict()
+        orig_filename = groups["patch_name"]
+        filename = orig_filename
+        patch_start_col, patch_end_col = m.span("patch_name")
+        orig_filename_start_col = patch_start_col
+        if filename.startswith("#"):
+            continue
+        if filename.startswith(("../", "./", "/")):
+            sm = _RE_UNNECESSARY_LEADING_PREFIX.match(filename)
+            assert sm is not None
+            slash_start, slash_end = sm.span(0)
+            orig_filename_start_col = slash_end
+            prefix = filename[:orig_filename_start_col]
+            filename = filename[orig_filename_start_col:]
+            slash_range = position_codec.range_to_client_units(
+                lint_state.lines,
+                Range(
+                    Position(
+                        line_no,
+                        patch_start_col + slash_start,
+                    ),
+                    Position(
+                        line_no,
+                        patch_start_col + slash_end,
+                    ),
+                ),
+            )
+            skip_use_check = False
+            if ".." in prefix:
+                diagnostic_title = f'Disallowed prefix "{prefix}"'
+                severity = DiagnosticSeverity.Error
+                skip_use_check = True
+            else:
+                diagnostic_title = f'Unnecessary prefix "{prefix}"'
+                severity = DiagnosticSeverity.Warning
+            diagnostics.append(
+                Diagnostic(
+                    slash_range,
+                    diagnostic_title,
+                    source="debputy",
+                    severity=severity,
+                    data=DiagnosticData(
+                        quickfixes=[
+                            propose_remove_range_quick_fix(
+                                proposed_title=f'Remove prefix "{prefix}"'
+                            )
+                        ]
+                    ),
+                )
+            )
+            if skip_use_check:
+                continue
+        if "//" in filename:
+            for usm in _RE_UNNECESSARY_SLASHES.finditer(filename):
+                start_col, end_cold = usm.span()
+                slash_range = position_codec.range_to_client_units(
+                    lint_state.lines,
+                    Range(
+                        Position(
+                            line_no,
+                            orig_filename_start_col + start_col,
+                        ),
+                        Position(
+                            line_no,
+                            orig_filename_start_col + end_cold,
+                        ),
+                    ),
+                )
+                diagnostics.append(
+                    Diagnostic(
+                        slash_range,
+                        "Unnecessary slashes",
+                        source="debputy",
+                        severity=DiagnosticSeverity.Warning,
+                        data=DiagnosticData(
+                            quickfixes=[propose_correct_text_quick_fix("/")]
+                        ),
+                    )
+                )
+            filename = _RE_UNNECESSARY_SLASHES.sub("/", filename)
+
+        patch_name_range = position_codec.range_to_client_units(
+            lint_state.lines,
+            Range(
+                Position(
+                    line_no,
+                    patch_start_col,
+                ),
+                Position(
+                    line_no,
+                    patch_end_col,
+                ),
+            ),
+        )
+        if not filename.lower().endswith((".diff", ".patch")):
+            diagnostics.append(
+                Diagnostic(
+                    patch_name_range,
+                    f'Patch not using ".patch" or ".diff" as extension: "{filename}"',
+                    source="debputy",
+                    severity=DiagnosticSeverity.Hint,
+                    data=DiagnosticData(
+                        quickfixes=[propose_correct_text_quick_fix(f"{filename}.patch")]
+                    ),
+                )
+            )
+        patch_path = f"{dpatches.path}/{filename}"
+        if patch_path not in all_patches:
+            diagnostics.append(
+                Diagnostic(
+                    patch_name_range,
+                    f'Non-existing patch "{filename}"',
+                    source="debputy",
+                    severity=DiagnosticSeverity.Error,
+                )
+            )
+        elif patch_path in used_patches:
+            diagnostics.append(
+                Diagnostic(
+                    patch_name_range,
+                    f'Duplicate patch: "{filename}"',
+                    source="debputy",
+                    severity=DiagnosticSeverity.Error,
+                )
+            )
+        else:
+            used_patches.add(patch_path)
+
+    unused_patches = all_patches - used_patches
+    for unused_patch in sorted(unused_patches):
+        patch_name = unused_patch[len(dpatches.path) + 1 :]
+        line_count = len(lint_state.lines)
+        file_range = Range(
+            Position(
+                0,
+                0,
+            ),
+            Position(
+                line_count,
+                len(lint_state.lines[-1]) if line_count else 0,
+            ),
+        )
+        diagnostics.append(
+            Diagnostic(
+                file_range,
+                f'Unused patch: "{patch_name}"',
+                source="debputy",
+                severity=DiagnosticSeverity.Warning,
+            )
+        )
+
+    return diagnostics
+
+
+@lsp_completer(_LANGUAGE_IDS)
+def _debian_patches_series_completions(
+    ls: "DebputyLanguageServer",
+    params: CompletionParams,
+) -> Optional[Union[CompletionList, Sequence[CompletionItem]]]:
+    doc = ls.workspace.get_text_document(params.text_document.uri)
+    if not is_valid_file(doc.path):
+        return None
+    lint_state = ls.lint_state(doc)
+    source_root = lint_state.source_root
+    dpatches = source_root.lookup("debian/patches") if source_root is not None else None
+    if dpatches is None:
+        return None
+    lines = doc.lines
+    position = doc.position_codec.position_from_client_units(lines, params.position)
+    line = lines[position.line]
+    if line.startswith("#"):
+        return None
+    try:
+        line.rindex(" #", 0, position.character)
+        return None  # In an end of line comment
+    except ValueError:
+        pass
+    already_used = set(_listed_patches(lines))
+    # `debian/patches + "/"`
+    dpatches_dir_len = len(dpatches.path) + 1
+    all_patch_files_gen = (
+        p.path[dpatches_dir_len:] for p in _all_patch_files(dpatches)
+    )
+    return [
+        CompletionItem(
+            p,
+            kind=CompletionItemKind.File,
+            insert_text=f"{p}\n",
+            label_details=CompletionItemLabelDetails(
+                description=f"debian/patches/{p}",
+            ),
+        )
+        for p in all_patch_files_gen
+        if p not in already_used
+    ]
+
+
+@lsp_semantic_tokens_full(_LANGUAGE_IDS)
+def _debian_patches_semantic_tokens_full(
+    ls: "DebputyLanguageServer",
+    request: SemanticTokensParams,
+) -> Optional[SemanticTokens]:
+    doc = ls.workspace.get_text_document(request.text_document.uri)
+    if not is_valid_file(doc.path):
+        return None
+    lines = doc.lines
+    position_codec = doc.position_codec
+
+    tokens: List[int] = []
+    string_token_code = SEMANTIC_TOKEN_TYPES_IDS[SemanticTokenTypes.String.value]
+    comment_token_code = SEMANTIC_TOKEN_TYPES_IDS[SemanticTokenTypes.Comment.value]
+    options_token_code = SEMANTIC_TOKEN_TYPES_IDS[SemanticTokenTypes.Keyword.value]
+    sem_token_state = SemanticTokensState(
+        ls,
+        doc,
+        lines,
+        tokens,
+    )
+
+    for line_no, line in enumerate(lines):
+        if line.isspace():
+            continue
+        m = _RE_LINE_COMMENT.match(line)
+        if m:
+            start_col, end_col = m.span(1)
+            start_pos = position_codec.position_to_client_units(
+                sem_token_state.lines,
+                Position(
+                    line_no,
+                    start_col,
+                ),
+            )
+            sem_token_state.emit_token(
+                start_pos,
+                position_codec.client_num_units(line[start_col:end_col]),
+                comment_token_code,
+            )
+            continue
+        m = _RE_PATCH_LINE.match(line)
+        if not m:
+            continue
+        groups = m.groupdict()
+        _emit_group(
+            line_no,
+            string_token_code,
+            sem_token_state,
+            "patch_name",
+            groups,
+            m,
+        )
+        _emit_group(
+            line_no,
+            options_token_code,
+            sem_token_state,
+            "options",
+            groups,
+            m,
+        )
+        _emit_group(
+            line_no,
+            comment_token_code,
+            sem_token_state,
+            "comment",
+            groups,
+            m,
+        )
+
+    return SemanticTokens(tokens)
+
+
+def _emit_group(
+    line_no: int,
+    token_code: int,
+    sem_token_state: SemanticTokensState,
+    group_name: str,
+    groups: Mapping[str, str],
+    match: re.Match,
+) -> None:
+    value = groups.get(group_name)
+    if not value:
+        return None
+    patch_start_col, patch_end_col = match.span(group_name)
+    position_codec = sem_token_state.doc.position_codec
+    patch_start_pos = position_codec.position_to_client_units(
+        sem_token_state.lines,
+        Position(
+            line_no,
+            patch_start_col,
+        ),
+    )
+    sem_token_state.emit_token(
+        patch_start_pos,
+        position_codec.client_num_units(value),
+        token_code,
+    )
diff --git a/src/debputy/lsp/lsp_debian_tests_control.py b/src/debputy/lsp/lsp_debian_tests_control.py
index 20a198c..3d418cb 100644
--- a/src/debputy/lsp/lsp_debian_tests_control.py
+++ b/src/debputy/lsp/lsp_debian_tests_control.py
@@ -138,8 +138,7 @@ def _diagnostics_for_paragraph(
     stanza_position: "TEPosition",
     known_fields: Mapping[str, Deb822KnownField],
     doc_reference: str,
-    position_codec: "LintCapablePositionCodec",
-    lines: List[str],
+    lint_state: LintState,
     diagnostics: List[Diagnostic],
 ) -> None:
     representation_field = _paragraph_representation_field(stanza)
@@ -151,8 +150,8 @@ def _diagnostics_for_paragraph(
             representation_field_pos, representation_field.size()
         )
     )
-    representation_field_range = position_codec.range_to_client_units(
-        lines,
+    representation_field_range = lint_state.position_codec.range_to_client_units(
+        lint_state.lines,
         representation_field_range_server_units,
     )
     for known_field in known_fields.values():
@@ -203,8 +202,8 @@ def _diagnostics_for_paragraph(
         )
         field_position_te = field_range_te.start_pos
         field_range_server_units = te_range_to_lsp(field_range_te)
-        field_range = position_codec.range_to_client_units(
-            lines,
+        field_range = lint_state.position_codec.range_to_client_units(
+            lint_state.lines,
             field_range_server_units,
         )
         field_name_typo_detected = False
@@ -229,8 +228,8 @@ def _diagnostics_for_paragraph(
                         field_position_te, kvpair.field_token.size()
                     )
                 )
-                field_range = position_codec.range_to_client_units(
-                    lines,
+                field_range = lint_state.position_codec.range_to_client_units(
+                    lint_state.lines,
                     token_range_server_units,
                 )
                 field_name_typo_detected = True
@@ -266,8 +265,7 @@ def _diagnostics_for_paragraph(
                 stanza,
                 stanza_position,
                 kvpair_position,
-                position_codec,
-                lines,
+                lint_state,
                 field_name_typo_reported=field_name_typo_detected,
             )
         )
@@ -296,8 +294,8 @@ def _diagnostics_for_paragraph(
                     word_range_server_units = te_range_to_lsp(
                         TERange.from_position_and_size(word_pos_te, word_range)
                     )
-                    word_range = position_codec.range_to_client_units(
-                        lines,
+                    word_range = lint_state.position_codec.range_to_client_units(
+                        lint_state.lines,
                         word_range_server_units,
                     )
                     diagnostics.append(
@@ -307,10 +305,11 @@ def _diagnostics_for_paragraph(
                             severity=DiagnosticSeverity.Hint,
                             source="debputy",
                             data=DiagnosticData(
+                                lint_severity="spelling",
                                 quickfixes=[
                                     propose_correct_text_quick_fix(c)
                                     for c in corrections
-                                ]
+                                ],
                             ),
                         )
                     )
@@ -417,9 +416,10 @@ def _scan_for_syntax_errors_and_token_level_diagnostics(
                         severity=DiagnosticSeverity.Hint,
                         source="debputy",
                         data=DiagnosticData(
+                            lint_severity="spelling",
                             quickfixes=[
                                 propose_correct_text_quick_fix(c) for c in corrections
-                            ]
+                            ],
                         ),
                     )
                 )
@@ -455,8 +455,7 @@ def _lint_debian_tests_control(
             paragraph_pos,
             known_fields,
             doc_reference,
-            position_codec,
-            lines,
+            lint_state,
             diagnostics,
         )
     return diagnostics
diff --git a/src/debputy/lsp/lsp_features.py b/src/debputy/lsp/lsp_features.py
index 63e4cd2..41313f3 100644
--- a/src/debputy/lsp/lsp_features.py
+++ b/src/debputy/lsp/lsp_features.py
@@ -20,6 +20,7 @@ from lsprotocol.types import (
     DidOpenTextDocumentParams,
     SemanticTokensLegend,
     TEXT_DOCUMENT_FORMATTING,
+    SemanticTokenTypes,
 )
 
 from debputy.commands.debputy_cmd.context import CommandContext
@@ -39,7 +40,12 @@ from debputy.lsp.text_util import on_save_trim_end_of_line_whitespace
 C = TypeVar("C", bound=Callable)
 
 SEMANTIC_TOKENS_LEGEND = SemanticTokensLegend(
-    token_types=["keyword", "enumMember", "comment"],
+    token_types=[
+        SemanticTokenTypes.Keyword.value,
+        SemanticTokenTypes.EnumMember.value,
+        SemanticTokenTypes.Comment.value,
+        SemanticTokenTypes.String.value,
+    ],
     token_modifiers=[],
 )
 SEMANTIC_TOKEN_TYPES_IDS = {
diff --git a/src/debputy/lsp/lsp_generic_deb822.py b/src/debputy/lsp/lsp_generic_deb822.py
index 5b1a22a..c8b476a 100644
--- a/src/debputy/lsp/lsp_generic_deb822.py
+++ b/src/debputy/lsp/lsp_generic_deb822.py
@@ -31,6 +31,7 @@ from lsprotocol.types import (
     SemanticTokens,
     TextEdit,
     MessageType,
+    SemanticTokenTypes,
 )
 
 from debputy.linting.lint_util import LintState
@@ -46,6 +47,7 @@ from debputy.lsp.lsp_features import SEMANTIC_TOKEN_TYPES_IDS
 from debputy.lsp.text_util import (
     te_position_to_lsp,
     trim_end_of_line_whitespace,
+    SemanticTokensState,
 )
 from debputy.lsp.vendoring._deb822_repro.locatable import (
     START_POSITION,
@@ -446,47 +448,35 @@ def deb822_folding_ranges(
     return folding_ranges
 
 
-@dataclasses.dataclass(slots=True)
-class SemanticTokenState:
-    ls: "DebputyLanguageServer"
-    file_metadata: Deb822FileMetadata[Any]
-    doc: "TextDocument"
-    lines: List[str]
-    tokens: List[int]
-    keyword_token_code: int
-    known_value_token_code: int
-    comment_token_code: int
-    _previous_line: int = 0
-    _previous_col: int = 0
-
-    def emit_token(
-        self,
-        start_pos: Position,
-        len_client_units: int,
-        token_code: int,
-        *,
-        token_modifiers: int = 0,
-    ) -> None:
-        line_delta = start_pos.line - self._previous_line
-        self._previous_line = start_pos.line
-        previous_col = self._previous_col
+class Deb822SemanticTokensState(SemanticTokensState):
 
-        if line_delta:
-            previous_col = 0
-
-        column_delta = start_pos.character - previous_col
-        self._previous_col = start_pos.character
+    __slots__ = (
+        "file_metadata",
+        "keyword_token_code",
+        "known_value_token_code",
+        "comment_token_code",
+    )
 
-        tokens = self.tokens
-        tokens.append(line_delta)  # Line delta
-        tokens.append(column_delta)  # Token column delta
-        tokens.append(len_client_units)  # Token length
-        tokens.append(token_code)
-        tokens.append(token_modifiers)
+    def __init__(
+        self,
+        ls: "DebputyLanguageServer",
+        doc: "TextDocument",
+        lines: List[str],
+        tokens: List[int],
+        file_metadata: Deb822FileMetadata[Any],
+        keyword_token_code: int,
+        known_value_token_code: int,
+        comment_token_code: int,
+    ) -> None:
+        super().__init__(ls, doc, lines, tokens)
+        self.file_metadata = file_metadata
+        self.keyword_token_code = keyword_token_code
+        self.known_value_token_code = known_value_token_code
+        self.comment_token_code = comment_token_code
 
 
 def _deb822_paragraph_semantic_tokens_full(
-    sem_token_state: SemanticTokenState,
+    sem_token_state: Deb822SemanticTokensState,
     stanza: Deb822ParagraphElement,
     stanza_idx: int,
 ) -> None:
@@ -612,15 +602,15 @@ def deb822_semantic_tokens_full(
         return None
 
     tokens: List[int] = []
-    comment_token_code = SEMANTIC_TOKEN_TYPES_IDS["comment"]
-    sem_token_state = SemanticTokenState(
+    comment_token_code = SEMANTIC_TOKEN_TYPES_IDS[SemanticTokenTypes.Comment.value]
+    sem_token_state = Deb822SemanticTokensState(
         ls,
-        file_metadata,
         doc,
         lines,
         tokens,
-        SEMANTIC_TOKEN_TYPES_IDS["keyword"],
-        SEMANTIC_TOKEN_TYPES_IDS["enumMember"],
+        file_metadata,
+        SEMANTIC_TOKEN_TYPES_IDS[SemanticTokenTypes.Keyword],
+        SEMANTIC_TOKEN_TYPES_IDS[SemanticTokenTypes.EnumMember],
         comment_token_code,
     )
 
diff --git a/src/debputy/lsp/quickfixes.py b/src/debputy/lsp/quickfixes.py
index a9fcf7b..8787d9f 100644
--- a/src/debputy/lsp/quickfixes.py
+++ b/src/debputy/lsp/quickfixes.py
@@ -10,6 +10,7 @@ from typing import (
     Optional,
     List,
     cast,
+    NotRequired,
 )
 
 from lsprotocol.types import (
@@ -44,6 +45,7 @@ except ImportError:
 CodeActionName = Literal[
     "correct-text",
     "remove-line",
+    "remove-range",
     "insert-text-on-line-after-diagnostic",
 ]
 
@@ -62,6 +64,11 @@ class RemoveLineCodeAction(TypedDict):
     code_action: Literal["remove-line"]
 
 
+class RemoveRangeCodeAction(TypedDict):
+    code_action: Literal["remove-range"]
+    proposed_title: NotRequired[str]
+
+
 def propose_correct_text_quick_fix(correct_value: str) -> CorrectTextCodeAction:
     return {
         "code_action": "correct-text",
@@ -84,6 +91,17 @@ def propose_remove_line_quick_fix() -> RemoveLineCodeAction:
     }
 
 
+def propose_remove_range_quick_fix(
+    *, proposed_title: Optional[str]
+) -> RemoveRangeCodeAction:
+    r: RemoveRangeCodeAction = {
+        "code_action": "remove-range",
+    }
+    if proposed_title:
+        r["proposed_title"] = proposed_title
+    return r
+
+
 CODE_ACTION_HANDLERS: Dict[
     CodeActionName,
     Callable[
@@ -230,6 +248,35 @@ def _remove_line_code_action(
     )
 
 
+@_code_handler_for("remove-range")
+def _remove_range_code_action(
+    code_action_data: RemoveRangeCodeAction,
+    code_action_params: CodeActionParams,
+    diagnostic: Diagnostic,
+) -> Iterable[Union[CodeAction, Command]]:
+    edit = TextEdit(
+        diagnostic.range,
+        "",
+    )
+    title = code_action_data.get("proposed_title", "Delete")
+    yield CodeAction(
+        title=title,
+        kind=CodeActionKind.QuickFix,
+        diagnostics=[diagnostic],
+        edit=WorkspaceEdit(
+            changes={code_action_params.text_document.uri: [edit]},
+            document_changes=[
+                TextDocumentEdit(
+                    text_document=OptionalVersionedTextDocumentIdentifier(
+                        uri=code_action_params.text_document.uri,
+                    ),
+                    edits=[edit],
+                )
+            ],
+        ),
+    )
+
+
 def provide_standard_quickfixes_from_diagnostics(
     code_action_params: CodeActionParams,
 ) -> Optional[List[Union[Command, CodeAction]]]:
diff --git a/src/debputy/lsp/spellchecking.py b/src/debputy/lsp/spellchecking.py
index b767802..4cf71f2 100644
--- a/src/debputy/lsp/spellchecking.py
+++ b/src/debputy/lsp/spellchecking.py
@@ -160,7 +160,8 @@ def spellcheck_line(
             severity=DiagnosticSeverity.Hint,
             source="debputy",
             data=DiagnosticData(
-                quickfixes=[propose_correct_text_quick_fix(c) for c in corrections]
+                lint_severity="spelling",
+                quickfixes=[propose_correct_text_quick_fix(c) for c in corrections],
             ),
         )
 
diff --git a/src/debputy/lsp/style_prefs.py b/src/debputy/lsp/style_prefs.py
index 755e67c..1bcd800 100644
--- a/src/debputy/lsp/style_prefs.py
+++ b/src/debputy/lsp/style_prefs.py
@@ -627,7 +627,9 @@ def determine_effective_style(
         return maint_style.as_effective_pref(), None
     uploaders = source_package.fields.get("Uploaders")
     if uploaders is None:
-        detected_style = maint_style.as_effective_pref() if maint_style is not None else None
+        detected_style = (
+            maint_style.as_effective_pref() if maint_style is not None else None
+        )
         return detected_style, None
     all_styles: List[Optional[EffectivePreference]] = []
     if maint_style is not None:
diff --git a/src/debputy/lsp/text_util.py b/src/debputy/lsp/text_util.py
index e58990f..dd87571 100644
--- a/src/debputy/lsp/text_util.py
+++ b/src/debputy/lsp/text_util.py
@@ -15,6 +15,7 @@ try:
         Position as TEPosition,
         Range as TERange,
     )
+    from debputy.lsp.debputy_ls import DebputyLanguageServer
 except ImportError:
     pass
 
@@ -138,3 +139,46 @@ def te_range_to_lsp(te_range: "TERange") -> Range:
         te_position_to_lsp(te_range.start_pos),
         te_position_to_lsp(te_range.end_pos),
     )
+
+
+class SemanticTokensState:
+    __slots__ = ("ls", "doc", "lines", "tokens", "_previous_line", "_previous_col")
+
+    def __init__(
+        self,
+        ls: "DebputyLanguageServer",
+        doc: "TextDocument",
+        lines: List[str],
+        tokens: List[int],
+    ) -> None:
+        self.ls = ls
+        self.doc = doc
+        self.lines = lines
+        self.tokens = tokens
+        self._previous_line = 0
+        self._previous_col = 0
+
+    def emit_token(
+        self,
+        start_pos: Position,
+        len_client_units: int,
+        token_code: int,
+        *,
+        token_modifiers: int = 0,
+    ) -> None:
+        line_delta = start_pos.line - self._previous_line
+        self._previous_line = start_pos.line
+        previous_col = self._previous_col
+
+        if line_delta:
+            previous_col = 0
+
+        column_delta = start_pos.character - previous_col
+        self._previous_col = start_pos.character
+
+        tokens = self.tokens
+        tokens.append(line_delta)  # Line delta
+        tokens.append(column_delta)  # Token column delta
+        tokens.append(len_client_units)  # Token length
+        tokens.append(token_code)
+        tokens.append(token_modifiers)
diff --git a/tests/lint_tests/lint_tutil.py b/tests/lint_tests/lint_tutil.py
index 26df505..65fe0ad 100644
--- a/tests/lint_tests/lint_tutil.py
+++ b/tests/lint_tests/lint_tutil.py
@@ -3,8 +3,8 @@ from typing import List, Optional, Mapping, Any, Callable
 
 import pytest
 
+from debputy.filesystem_scan import VirtualPathBase
 from debputy.linting.lint_util import (
-    LinterImpl,
     LinterPositionCodec,
     LintStateImpl,
     LintState,
@@ -44,6 +44,7 @@ class LintWrapper:
         self.dctrl_lines: Optional[List[str]] = None
         self.path = path
         self._dctrl_parser = dctrl_parser
+        self.source_root: Optional[VirtualPathBase] = None
         self.lint_style_preference_table = StylePreferenceTable({}, {})
         self.effective_preference: Optional[EffectivePreference] = None
 
@@ -57,11 +58,13 @@ class LintWrapper:
                     dctrl_lines, ignore_errors=True
                 )
             )
+        source_root = self.source_root
+        debian_dir = source_root.get("debian") if source_root is not None else None
         state = LintStateImpl(
             self._debputy_plugin_feature_set,
             self.lint_style_preference_table,
-            None,
-            None,
+            source_root,
+            debian_dir,
             self.path,
             "".join(dctrl_lines) if dctrl_lines is not None else "",
             lines,
@@ -84,6 +87,7 @@ def check_diagnostics(
     if diagnostics:
         for diagnostic in diagnostics:
             assert diagnostic.severity is not None
+            assert diagnostic.source is not None
     return diagnostics
 
 
diff --git a/tests/lint_tests/test_lint_dcpy.py b/tests/lint_tests/test_lint_dcpy.py
new file mode 100644
index 0000000..f827d3e
--- /dev/null
+++ b/tests/lint_tests/test_lint_dcpy.py
@@ -0,0 +1,64 @@
+import textwrap
+
+import pytest
+
+from debputy.lsp.lsp_debian_copyright import _lint_debian_copyright
+from debputy.packages import DctrlParser
+from debputy.plugin.api.feature_set import PluginProvidedFeatureSet
+from lint_tests.lint_tutil import (
+    group_diagnostics_by_severity,
+    LintWrapper,
+)
+
+try:
+    from lsprotocol.types import Diagnostic, DiagnosticSeverity
+except ImportError:
+    pass
+
+
+@pytest.fixture
+def line_linter(
+    debputy_plugin_feature_set: PluginProvidedFeatureSet,
+    lint_dctrl_parser: DctrlParser,
+) -> LintWrapper:
+    return LintWrapper(
+        "/nowhere/debian/copyright",
+        _lint_debian_copyright,
+        debputy_plugin_feature_set,
+        lint_dctrl_parser,
+    )
+
+
+def test_dcpy_files_lint(line_linter: LintWrapper) -> None:
+    lines = textwrap.dedent(
+        """\
+    Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+
+    Files: foo .//unnecessary///many/slashes
+    Copyright: Noone <noone@example.com>
+    License: something
+     yada yada yada
+    """
+    ).splitlines(keepends=True)
+
+    diagnostics = line_linter(lines)
+    by_severity = group_diagnostics_by_severity(diagnostics)
+    assert DiagnosticSeverity.Warning in by_severity
+
+    assert DiagnosticSeverity.Error not in by_severity
+    assert DiagnosticSeverity.Hint not in by_severity
+    assert DiagnosticSeverity.Information not in by_severity
+
+    warnings = by_severity[DiagnosticSeverity.Warning]
+    print(warnings)
+    assert len(warnings) == 2
+
+    first_warn, second_warn = warnings
+
+    msg = 'Unnecessary prefix ".//"'
+    assert first_warn.message == msg
+    assert f"{first_warn.range}" == "2:11-2:14"
+
+    msg = 'Simplify to a single "/"'
+    assert second_warn.message == msg
+    assert f"{second_warn.range}" == "2:25-2:28"
diff --git a/tests/lint_tests/test_lint_dctrl.py b/tests/lint_tests/test_lint_dctrl.py
index bcb1613..7e9477e 100644
--- a/tests/lint_tests/test_lint_dctrl.py
+++ b/tests/lint_tests/test_lint_dctrl.py
@@ -4,6 +4,7 @@ from typing import List, Optional
 import pytest
 
 from debputy.lsp.lsp_debian_control import _lint_debian_control
+from debputy.lsp.lsp_debian_control_reference_data import CURRENT_STANDARDS_VERSION
 from debputy.packages import DctrlParser
 from debputy.plugin.api.feature_set import PluginProvidedFeatureSet
 from lint_tests.lint_tutil import (
@@ -18,9 +19,6 @@ except ImportError:
     pass
 
 
-STANDARDS_VERSION = "4.7.0"
-
-
 class DctrlLintWrapper(LintWrapper):
 
     def __call__(self, lines: List[str]) -> Optional[List["Diagnostic"]]:
@@ -104,7 +102,7 @@ def test_dctrl_lint_typos(line_linter: LintWrapper) -> None:
     lines = textwrap.dedent(
         f"""\
     Source: foo
-    Standards-Version: {STANDARDS_VERSION}
+    Standards-Version: {CURRENT_STANDARDS_VERSION}
     Priority: optional
     Section: devel
     Maintainer: Jane Developer <jane@example.com>
@@ -137,7 +135,7 @@ def test_dctrl_lint_mx_value_with_typo(line_linter: LintWrapper) -> None:
     lines = textwrap.dedent(
         f"""\
     Source: foo
-    Standards-Version: {STANDARDS_VERSION}
+    Standards-Version: {CURRENT_STANDARDS_VERSION}
     Priority: optional
     Section: devel
     Maintainer: Jane Developer <jane@example.com>
@@ -176,7 +174,7 @@ def test_dctrl_lint_mx_value(line_linter: LintWrapper) -> None:
     lines = textwrap.dedent(
         f"""\
     Source: foo
-    Standards-Version: {STANDARDS_VERSION}
+    Standards-Version: {CURRENT_STANDARDS_VERSION}
     Priority: optional
     Section: devel
     Maintainer: Jane Developer <jane@example.com>
@@ -205,7 +203,7 @@ def test_dctrl_lint_mx_value(line_linter: LintWrapper) -> None:
     lines = textwrap.dedent(
         f"""\
     Source: foo
-    Standards-Version: {STANDARDS_VERSION}
+    Standards-Version: {CURRENT_STANDARDS_VERSION}
     Priority: optional
     Section: devel
     Maintainer: Jane Developer <jane@example.com>
@@ -238,14 +236,14 @@ def test_dctrl_lint_dup_sep(line_linter: LintWrapper) -> None:
     Source: foo
     Section: devel
     Priority: optional
-    Standards-Version: {STANDARDS_VERSION}
+    Standards-Version: {CURRENT_STANDARDS_VERSION}
     Maintainer: Jane Developer <jane@example.com>
     Build-Depends: debhelper-compat (= 13)
 
     Package: foo
     Architecture: all
-    Depends: foo,
-     , bar
+    Depends: bar,
+     , baz
     Description: Some very interesting synopsis
      A very interesting description
      that spans multiple lines
@@ -263,3 +261,250 @@ def test_dctrl_lint_dup_sep(line_linter: LintWrapper) -> None:
     assert error.message == msg
     assert f"{error.range}" == "10:1-10:2"
     assert error.severity == DiagnosticSeverity.Error
+
+
+def test_dctrl_lint_ma(line_linter: LintWrapper) -> None:
+    lines = textwrap.dedent(
+        f"""\
+    Source: foo
+    Section: devel
+    Priority: optional
+    Standards-Version: {CURRENT_STANDARDS_VERSION}
+    Maintainer: Jane Developer <jane@example.com>
+    Build-Depends: debhelper-compat (= 13)
+
+    Package: foo
+    Architecture: all
+    Multi-Arch: same
+    Depends: bar, baz
+    Description: Some very interesting synopsis
+     A very interesting description
+     that spans multiple lines
+     .
+     Just so be clear, this is for a test.
+    """
+    ).splitlines(keepends=True)
+
+    diagnostics = line_linter(lines)
+    print(diagnostics)
+    assert diagnostics and len(diagnostics) == 1
+    error = diagnostics[0]
+
+    msg = "Multi-Arch: same is not valid for Architecture: all packages. Maybe you want foreign?"
+    assert error.message == msg
+    assert f"{error.range}" == "9:12-9:16"
+    assert error.severity == DiagnosticSeverity.Error
+
+
+def test_dctrl_lint_udeb(line_linter: LintWrapper) -> None:
+    lines = textwrap.dedent(
+        f"""\
+    Source: foo
+    Section: devel
+    Priority: optional
+    Standards-Version: {CURRENT_STANDARDS_VERSION}
+    Maintainer: Jane Developer <jane@example.com>
+    Build-Depends: debhelper-compat (= 13)
+
+    Package: foo
+    Architecture: all
+    XB-Installer-Menu-Item: 1234
+    Depends: bar, baz
+    Description: Some very interesting synopsis
+     A very interesting description
+     that spans multiple lines
+     .
+     Just so be clear, this is for a test.
+
+    Package: bar-udeb
+    Architecture: all
+    Section: debian-installer
+    Package-Type: udeb
+    XB-Installer-Menu-Item: golf
+    Description: Some very interesting synopsis
+     A very interesting description
+     that spans multiple lines
+     .
+     Just so be clear, this is for a test.
+    """
+    ).splitlines(keepends=True)
+
+    diagnostics = line_linter(lines)
+    print(diagnostics)
+    assert diagnostics and len(diagnostics) == 2
+    first, second = diagnostics
+
+    msg = "The XB-Installer-Menu-Item field is only applicable to udeb packages (`Package-Type: udeb`)"
+    assert first.message == msg
+    assert f"{first.range}" == "9:0-9:22"
+    assert first.severity == DiagnosticSeverity.Warning
+
+    msg = r'The value "golf" does not match the regex ^[1-9]\d{3,4}$.'
+    assert second.message == msg
+    assert f"{second.range}" == "21:24-21:28"
+    assert second.severity == DiagnosticSeverity.Error
+
+
+def test_dctrl_lint_arch_only_fields(line_linter: LintWrapper) -> None:
+    lines = textwrap.dedent(
+        f"""\
+    Source: foo
+    Section: devel
+    Priority: optional
+    Standards-Version: {CURRENT_STANDARDS_VERSION}
+    Maintainer: Jane Developer <jane@example.com>
+    Build-Depends: debhelper-compat (= 13)
+
+    Package: foo
+    Architecture: all
+    X-DH-Build-For-Type: target
+    Depends: bar, baz
+    Description: Some very interesting synopsis
+     A very interesting description
+     that spans multiple lines
+     .
+     Just so be clear, this is for a test.
+    """
+    ).splitlines(keepends=True)
+
+    diagnostics = line_linter(lines)
+    print(diagnostics)
+    assert diagnostics and len(diagnostics) == 1
+    issue = diagnostics[0]
+
+    msg = "The X-DH-Build-For-Type field is not applicable to arch:all packages (`Architecture: all`)"
+    assert issue.message == msg
+    assert f"{issue.range}" == "9:0-9:19"
+    assert issue.severity == DiagnosticSeverity.Warning
+
+
+def test_dctrl_lint_sv(line_linter: LintWrapper) -> None:
+    lines = textwrap.dedent(
+        f"""\
+    Source: foo
+    Section: devel
+    Priority: optional
+    Standards-Version: 4.6.2
+    Maintainer: Jane Developer <jane@example.com>
+    Build-Depends: debhelper-compat (= 13)
+
+    Package: foo
+    Architecture: all
+    Depends: bar, baz
+    Description: Some very interesting synopsis
+     A very interesting description
+     that spans multiple lines
+     .
+     Just so be clear, this is for a test.
+    """
+    ).splitlines(keepends=True)
+
+    diagnostics = line_linter(lines)
+    print(diagnostics)
+    assert diagnostics and len(diagnostics) == 1
+    issue = diagnostics[0]
+
+    msg = f"Latest Standards-Version is {CURRENT_STANDARDS_VERSION}"
+    assert issue.message == msg
+    assert f"{issue.range}" == "3:19-3:24"
+    assert issue.severity == DiagnosticSeverity.Information
+
+    lines = textwrap.dedent(
+        f"""\
+    Source: foo
+    Section: devel
+    Priority: optional
+    Standards-Version: Golf
+    Maintainer: Jane Developer <jane@example.com>
+    Build-Depends: debhelper-compat (= 13)
+
+    Package: foo
+    Architecture: all
+    Depends: bar, baz
+    Description: Some very interesting synopsis
+     A very interesting description
+     that spans multiple lines
+     .
+     Just so be clear, this is for a test.
+    """
+    ).splitlines(keepends=True)
+
+    diagnostics = line_linter(lines)
+    print(diagnostics)
+    assert diagnostics and len(diagnostics) == 1
+    issue = diagnostics[0]
+
+    msg = f'Not a valid version. Current version is "{CURRENT_STANDARDS_VERSION}"'
+    assert issue.message == msg
+    assert f"{issue.range}" == "3:19-3:23"
+    assert issue.severity == DiagnosticSeverity.Warning
+
+    lines = textwrap.dedent(
+        f"""\
+    Source: foo
+    Section: devel
+    Priority: optional
+    Standards-Version: {CURRENT_STANDARDS_VERSION}.0
+    Maintainer: Jane Developer <jane@example.com>
+    Build-Depends: debhelper-compat (= 13)
+
+    Package: foo
+    Architecture: all
+    Depends: bar, baz
+    Description: Some very interesting synopsis
+     A very interesting description
+     that spans multiple lines
+     .
+     Just so be clear, this is for a test.
+    """
+    ).splitlines(keepends=True)
+
+    diagnostics = line_linter(lines)
+    print(diagnostics)
+    assert diagnostics and len(diagnostics) == 1
+    issue = diagnostics[0]
+
+    msg = "Unnecessary version segment. This part of the version is only used for editorial changes"
+    assert issue.message == msg
+    assert f"{issue.range}" == "3:24-3:26"
+    assert issue.severity == DiagnosticSeverity.Information
+
+
+def test_dctrl_lint_multiple_vcs(line_linter: LintWrapper) -> None:
+    lines = textwrap.dedent(
+        f"""\
+    Source: foo
+    Section: devel
+    Priority: optional
+    Standards-Version: {CURRENT_STANDARDS_VERSION}
+    Maintainer: Jane Developer <jane@example.com>
+    Build-Depends: debhelper-compat (= 13)
+    Vcs-Git: https://salsa.debian.org/debian/foo
+    Vcs-Svn: https://svn.debian.org/debian/foo
+    Vcs-Browser: https://salsa.debian.org/debian/foo
+
+    Package: foo
+    Architecture: all
+    Depends: bar, baz
+    Description: Some very interesting synopsis
+     A very interesting description
+     that spans multiple lines
+     .
+     Just so be clear, this is for a test.
+    """
+    ).splitlines(keepends=True)
+
+    diagnostics = line_linter(lines)
+    print(diagnostics)
+    assert diagnostics and len(diagnostics) == 2
+    first_issue, second_issue = diagnostics
+
+    msg = f'Multiple Version Control fields defined ("Vcs-Git")'
+    assert first_issue.message == msg
+    assert f"{first_issue.range}" == "6:0-7:0"
+    assert first_issue.severity == DiagnosticSeverity.Warning
+
+    msg = f'Multiple Version Control fields defined ("Vcs-Svn")'
+    assert second_issue.message == msg
+    assert f"{second_issue.range}" == "7:0-8:0"
+    assert second_issue.severity == DiagnosticSeverity.Warning
diff --git a/tests/lint_tests/test_lint_dpatches_series.py b/tests/lint_tests/test_lint_dpatches_series.py
new file mode 100644
index 0000000..ed2a802
--- /dev/null
+++ b/tests/lint_tests/test_lint_dpatches_series.py
@@ -0,0 +1,152 @@
+import textwrap
+
+import pytest
+
+from debputy.lsp.lsp_debian_patches_series import _lint_debian_patches_series
+from debputy.packages import DctrlParser
+from debputy.plugin.api.feature_set import PluginProvidedFeatureSet
+from debputy.plugin.api.test_api import build_virtual_file_system
+from lint_tests.lint_tutil import (
+    LintWrapper,
+)
+
+try:
+    from lsprotocol.types import Diagnostic, DiagnosticSeverity
+except ImportError:
+    pass
+
+
+@pytest.fixture
+def line_linter(
+    debputy_plugin_feature_set: PluginProvidedFeatureSet,
+    lint_dctrl_parser: DctrlParser,
+) -> LintWrapper:
+    return LintWrapper(
+        "/nowhere/debian/patches/series",
+        _lint_debian_patches_series,
+        debputy_plugin_feature_set,
+        lint_dctrl_parser,
+    )
+
+
+def test_dpatches_series_files_lint(line_linter: LintWrapper) -> None:
+    lines = textwrap.dedent(
+        """\
+    # Some leading comment
+
+    ../some.patch
+
+    .//.//./subdir/another-delta.diff # foo
+
+    subdir/no-issues.patch # bar
+    """
+    ).splitlines(keepends=True)
+
+    fs = build_virtual_file_system(
+        [
+            "./debian/patches/series",
+            "./debian/some.patch",
+            "./debian/patches/subdir/another-delta.diff",
+            "./debian/patches/subdir/no-issues.patch",
+        ]
+    )
+
+    line_linter.source_root = fs
+
+    diagnostics = line_linter(lines)
+    print(diagnostics)
+    assert len(diagnostics) == 2
+
+    first_issue, second_issue = diagnostics
+
+    msg = 'Disallowed prefix "../"'
+    assert first_issue.message == msg
+    assert f"{first_issue.range}" == "2:0-2:3"
+    assert first_issue.severity == DiagnosticSeverity.Error
+
+    msg = 'Unnecessary prefix ".//.//./"'
+    assert second_issue.message == msg
+    assert f"{second_issue.range}" == "4:0-4:8"
+    assert second_issue.severity == DiagnosticSeverity.Warning
+
+
+def test_dpatches_series_files_file_mismatch_lint(line_linter: LintWrapper) -> None:
+    lines = textwrap.dedent(
+        """\
+    # Some leading comment
+
+    some/used-twice.patch
+
+    some/missing-file.patch
+
+    some/used-twice.patch
+    """
+    ).splitlines(keepends=True)
+
+    fs = build_virtual_file_system(
+        [
+            "./debian/patches/series",
+            "./debian/ignored.patch",
+            "./debian/patches/some/unused-file.diff",
+            "./debian/patches/some/used-twice.patch",
+        ]
+    )
+
+    line_linter.source_root = fs
+
+    diagnostics = line_linter(lines)
+    print(diagnostics)
+    assert len(diagnostics) == 3
+
+    first_issue, second_issue, third_issue = diagnostics
+
+    msg = 'Non-existing patch "some/missing-file.patch"'
+    assert first_issue.message == msg
+    assert f"{first_issue.range}" == "4:0-4:23"
+    assert first_issue.severity == DiagnosticSeverity.Error
+
+    msg = 'Duplicate patch: "some/used-twice.patch"'
+    assert second_issue.message == msg
+    assert f"{second_issue.range}" == "6:0-6:21"
+    assert second_issue.severity == DiagnosticSeverity.Error
+
+    msg = 'Unused patch: "some/unused-file.diff"'
+    assert third_issue.message == msg
+    assert f"{third_issue.range}" == "0:0-7:22"
+    assert third_issue.severity == DiagnosticSeverity.Warning
+
+
+def test_dpatches_series_files_ext_lint(line_linter: LintWrapper) -> None:
+    lines = textwrap.dedent(
+        """\
+    # Some leading comment
+
+    some/ok.diff
+
+    some/ok.patch
+
+    some/no-extension
+    """
+    ).splitlines(keepends=True)
+
+    fs = build_virtual_file_system(
+        [
+            "./debian/patches/series",
+            "./debian/patches/some/ok.diff",
+            "./debian/patches/some/ok.patch",
+            "./debian/patches/some/no-extension",
+        ]
+    )
+
+    line_linter.source_root = fs
+
+    diagnostics = line_linter(lines)
+    print(diagnostics)
+    assert len(diagnostics) == 1
+
+    issue = diagnostics[0]
+
+    msg = 'Patch not using ".patch" or ".diff" as extension: "some/no-extension"'
+    assert issue.message == msg
+    assert f"{issue.range}" == "6:0-6:17"
+    assert issue.severity == DiagnosticSeverity.Hint
diff --git a/tests/lsp_tests/test_lsp_dpatches_series.py b/tests/lsp_tests/test_lsp_dpatches_series.py
new file mode 100644
index 0000000..e7a1275
--- /dev/null
+++ b/tests/lsp_tests/test_lsp_dpatches_series.py
@@ -0,0 +1,59 @@
+import textwrap
+
+from debputy.lsp.debputy_ls import DebputyLanguageServer
+
+try:
+    from lsprotocol.types import (
+        CompletionParams,
+        TextDocumentIdentifier,
+        HoverParams,
+        MarkupContent,
+        SemanticTokensParams,
+    )
+
+    from debputy.lsp.lsp_debian_patches_series import (
+        _debian_patches_semantic_tokens_full,
+        _debian_patches_series_completions,
+    )
+
+    from pygls.server import LanguageServer
+except ImportError:
+    pass
+from lsp_tests.lsp_tutil import (
+    put_doc_no_cursor,
+    resolve_semantic_tokens,
+    resolved_semantic_token,
+)
+
+
+def test_dpatches_series_semantic_tokens(ls: "DebputyLanguageServer") -> None:
+    doc_uri = "file:///nowhere/debian/patches/series"
+    put_doc_no_cursor(
+        ls,
+        doc_uri,
+        "debian/patches/series",
+        textwrap.dedent(
+            """\
+        # Some leading comment
+
+        some.patch
+
+        another-delta.diff # foo
+"""
+        ),
+    )
+
+    semantic_tokens = _debian_patches_semantic_tokens_full(
+        ls,
+        SemanticTokensParams(TextDocumentIdentifier(doc_uri)),
+    )
+    resolved_semantic_tokens = resolve_semantic_tokens(semantic_tokens)
+    assert resolved_semantic_tokens is not None
+    assert resolved_semantic_tokens == [
+        resolved_semantic_token(0, 0, len("# Some leading comment"), "comment"),
+        resolved_semantic_token(2, 0, len("some.patch"), "string"),
+        resolved_semantic_token(4, 0, len("another-delta.diff"), "string"),
+        resolved_semantic_token(
+            4, len("another-delta.diff") + 1, len("# foo"), "comment"
+        ),
+    ]
diff --git a/tests/plugin_tests/grantlee_test.py b/tests/plugin_tests/grantlee_test.py
new file mode 100644
index 0000000..2cbcd2c
--- /dev/null
+++ b/tests/plugin_tests/grantlee_test.py
@@ -0,0 +1,34 @@
+from debputy.plugin.api.test_api import (
+    initialize_plugin_under_test,
+    build_virtual_file_system,
+    package_metadata_context,
+)
+
+
+def test_grantlee_dependencies(amd64_dpkg_architecture_variables) -> None:
+    plugin = initialize_plugin_under_test()
+    fs = build_virtual_file_system([])
+    context = package_metadata_context(package_fields={"Architecture": "all"})
+    metadata = plugin.run_metadata_detector("detect-grantlee-dependencies", fs, context)
+    assert "grantlee:Depends" not in metadata.substvars
+
+    context = package_metadata_context(
+        package_fields={"Architecture": "any"},
+        host_arch=amd64_dpkg_architecture_variables.current_host_arch,
+    )
+    madir = amd64_dpkg_architecture_variables.current_host_multiarch
+    fs = build_virtual_file_system(
+        [
+            f"usr/lib/{madir}/grantlee/random-dir",
+        ]
+    )
+    metadata = plugin.run_metadata_detector("detect-grantlee-dependencies", fs, context)
+    assert "grantlee:Depends" not in metadata.substvars
+
+    fs = build_virtual_file_system(
+        [
+            f"usr/lib/{madir}/grantlee/5.0/foo.so",
+        ]
+    )
+    metadata = plugin.run_metadata_detector("detect-grantlee-dependencies", fs, context)
+    assert metadata.substvars["grantlee:Depends"] == "grantlee5-templates-5-0"