tools/clean_svg: allow passing in a .tablet file

If the svg file passed in is a .tablet file, extract the layout and
tablet name from there. This allows us to run the tool on the existing
tablet files to check for any differences.

Add this into the CI so we ensure that script doesn't crash on our SVG
files.

.github/workflows/main.yml

@@ -194,6 +194,22 @@ jobs:
           test $(libwacom-list-devices --format=yaml | yq -r '.devices[] | select(.bus == "usb") | select(.vid == "0x056a") | select(.pid == "0x0358") | .name' | wc -l) -eq 1
           test $(libwacom-list-devices --format=yaml | yq -r '.devices[] | select(.bus == "usb") | select(.vid == "0x056a") | select(.pid == "0x032a") | .name' | wc -l) -eq 1
 
+  ####
+  # make sure clean_svg.py works on our layout files
+  clean-svg-check:
+    needs: build-and-dist
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - name: run clean-svg on all .tablet files
+        run: |
+          for tabletfile in data/*.tablet; do
+            ./tools/clean_svg.py --ignore-missing "$tabletfile" ""
+          done
+
   ###
   #
   # tarball verification

tools/clean_svg.py

@@ -19,6 +19,7 @@
 #
 
 import sys
+from pathlib import Path
 from argparse import ArgumentParser
 from xml.etree import ElementTree as ET
 
@@ -301,6 +302,9 @@ def clean_svg(root, tabletname):
 
 if __name__ == "__main__":
     parser = ArgumentParser(description="Clean SVG files for libwacom")
+    parser.add_argument(
+        "--ignore-missing", action="store_true", default=False, help="Ignore .tablet files without a Layout"
+    )
     parser.add_argument(
         "filename", type=str, help="SVG file to clean", metavar="FILE"
     )
@@ -312,12 +316,27 @@ def clean_svg(root, tabletname):
     )
     args = parser.parse_args()
 
+    svgfile = args.filename
+    tabletname = args.tabletname
+    if args.filename.endswith(".tablet"):
+        import configparser
+        config = configparser.ConfigParser()
+        config.read(args.filename)
+        try:
+            svgname = config["Device"]["Layout"]
+        except KeyError:
+            print(f"{args.filename} does not specify a layout, skipping", file=sys.stderr)
+            sys.exit(0 if args.ignore_missing else 77)
+        svgfile = Path(args.filename).parent / "layouts" / svgname
+        tabletname = config["Device"]["Name"]
+
+
     ET.register_namespace("", NAMESPACE)
     try:
-        tree = ET.parse(args.filename)
+        tree = ET.parse(svgfile)
     except Exception as e:
         sys.stderr.write(str(e) + "\n")
         sys.exit(1)
     root = tree.getroot()
-    clean_svg(root, args.tabletname)
+    clean_svg(root, tabletname)
     print(to_string(root))