1 files changed, 97 insertions, 0 deletions
diff --git a/src/debputy/plugin/debputy/discard_rules.py b/src/debputy/plugin/debputy/discard_rules.py
new file mode 100644
index 0000000..689761e
--- /dev/null
+++ b/src/debputy/plugin/debputy/discard_rules.py
@@ -0,0 +1,97 @@
+import re
+
+from debputy.plugin.api import VirtualPath
+
+_VCS_PATHS = {
+    ".arch-inventory",
+    ".arch-ids",
+    ".be",
+    ".bzrbackup",
+    ".bzrignore",
+    ".bzrtags",
+    ".cvsignore",
+    ".hg",
+    ".hgignore",
+    ".hgtags",
+    ".hgsigs",
+    ".git",
+    ".gitignore",
+    ".gitattributes",
+    ".gitmodules",
+    ".gitreview",
+    ".mailmap",
+    ".mtn-ignore",
+    ".svn",
+    "{arch}",
+    "CVS",
+    "RCS",
+    "_MTN",
+    "_darcs",
+}
+
+_BACKUP_FILES_RE = re.compile(
+    "|".join(
+        [
+            # Common backup files
+            r".*~",
+            r".*[.](?:bak|orig|rej)",
+            # Editor backup/swap files
+            r"[.]#.*",
+            r"[.].*[.]sw.",
+            # Other known stuff
+            r"[.]shelf",
+            r",,.*",  # "baz-style junk" (according to dpkg (Dpkg::Source::Package)
+            r"DEADJOE",  # Joe's one line of immortality that just gets cargo cult'ed around ... just in case.
+        ]
+    )
+)
+
+_DOXYGEN_DIR_TEST_FILES = ["doxygen.css", "doxygen.svg", "index.html"]
+
+
+def _debputy_discard_pyc_files(path: "VirtualPath") -> bool:
+    if path.name == "__pycache__" and path.is_dir:
+        return True
+    return path.name.endswith((".pyc", ".pyo")) and path.is_file
+
+
+def _debputy_prune_la_files(path: "VirtualPath") -> bool:
+    return (
+        path.name.endswith(".la")
+        and path.is_file
+        and path.absolute.startswith("/usr/lib")
+    )
+
+
+def _debputy_prune_backup_files(path: VirtualPath) -> bool:
+    return bool(_BACKUP_FILES_RE.match(path.name))
+
+
+def _debputy_prune_vcs_paths(path: VirtualPath) -> bool:
+    return path.name in _VCS_PATHS
+
+
+def _debputy_prune_info_dir_file(path: VirtualPath) -> bool:
+    return path.absolute == "/usr/share/info/dir"
+
+
+def _debputy_prune_binary_debian_dir(path: VirtualPath) -> bool:
+    return path.absolute == "/DEBIAN"
+
+
+def _debputy_prune_doxygen_cruft(path: VirtualPath) -> bool:
+    if not path.name.endswith((".md5", ".map")) or not path.is_file:
+        return False
+    parent_dir = path.parent_dir
+    while parent_dir:
+        is_doxygen_dir = True
+        for name in _DOXYGEN_DIR_TEST_FILES:
+            test_file = parent_dir.get(name)
+            if test_file is None or not test_file.is_file:
+                is_doxygen_dir = False
+                break
+
+        if is_doxygen_dir:
+            return True
+        parent_dir = parent_dir.parent_dir
+    return False