1 files changed, 71 insertions, 0 deletions
diff --git a/debputy/plugins/gnome.py b/debputy/plugins/gnome.py
new file mode 100644
index 0000000..6ea56eb
--- /dev/null
+++ b/debputy/plugins/gnome.py
@@ -0,0 +1,71 @@
+import re
+from typing import Any
+
+from debputy.plugin.api import (
+    DebputyPluginInitializer,
+    BinaryCtrlAccessor,
+    PackageProcessingContext,
+)
+from debputy.util import _error
+
+GNOME_VERSION1_RE = re.compile(r"^(\d+:)?(\d+)\.(\d+)\.[\d.]+.*$")
+GNOME_VERSION2_RE = re.compile(
+    r"^(\d+:)?(\d+)(?:\.[\d.]+|~(alpha|beta|rc)[\d.]*|[+~])?.*$"
+)
+
+
+def initialize(api: DebputyPluginInitializer) -> None:
+    api.metadata_or_maintscript_detector(
+        "gnome-versions",
+        gnome_versions,
+        # Probably not necessary, but this is the most faithful conversion
+        package_type=["deb", "udeb"],
+    )
+    # Looking for "clean_la_files"? The `debputy` plugin provides a replacement
+    # feature.
+
+
+def gnome_versions(
+    _unused: Any,
+    ctrl: BinaryCtrlAccessor,
+    context: PackageProcessingContext,
+) -> None:
+    # Conversion note: In debhelper, $dh{VERSION} is actually the "source" version
+    # (though sometimes it has a binNMU version too).  In `debputy`, we have access
+    # to the "true" binary version (dpkg-gencontrol -v<VERSION>). In 99% of all cases,
+    # the difference is irrelevant as people rarely use dpkg-gencontrol -v<VERSION>.
+    version = context.binary_package_version
+    m = GNOME_VERSION1_RE.match(version)
+    epoch = ""
+    gnome_version = ""
+    gnome_next_version = ""
+    if m:
+        major_version = int(m.group(2))
+        if major_version < 40:
+            epoch = m.group(1)
+            minor_version = int(m.group(3))
+            gnome_version = f"{major_version}.{minor_version}"
+            if major_version == 3 and minor_version == 38:
+                prefix = ""
+            else:
+                prefix = f"{major_version}."
+            gnome_next_version = f"{prefix}{minor_version + 2}"
+    if gnome_version == "":
+        m = GNOME_VERSION2_RE.match(version)
+        if not m:
+            _error(
+                f"Unable to determine the GNOME major version from {version} for package"
+                f" {context.binary_package.name}. If this is not a GNOME package or it does"
+                f" not follow the GNOME version standard, please disable the GNOME plugin"
+                f" (debputy-plugin-gnome)."
+            )
+        epoch = m.group(1)
+        version = int(m.group(2))
+        gnome_version = f"{version}~"
+        gnome_next_version = f"{version + 1}~"
+    if epoch is None:
+        epoch = ""
+    ctrl.substvars["gnome:Version"] = f"{epoch}{gnome_version}"
+    ctrl.substvars["gnome:UpstreamVersion"] = f"{gnome_version}"
+    ctrl.substvars["gnome:NextVersion"] = f"{epoch}{gnome_next_version}"
+    ctrl.substvars["gnome:NextUpstreamVersion"] = f"{gnome_next_version}"