Add CI via GitHub Actions (#9)

The version of inkscape available uses new commandline flags and
generates slightly different output, so the exports have been updated as
well.

.github/workflows/ci.yml

@@ -0,0 +1,33 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  format:
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install black
+      run: pip3 install black
+    - name: Run black
+      run: python3 -m black .
+    - name: Check output
+      run: git --no-pager diff --exit-code HEAD
+
+  export:
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install inkscape and imagemagick
+      run: |
+        sudo add-apt-repository ppa:inkscape.dev/stable
+        sudo apt-get update -q
+        sudo apt-get install inkscape imagemagick -y
+    - name: Run inkscape export
+      run: |
+        inkscape --version
+        ./export.py
+    - name: Check output
+      # Ignore .svg files because Ubuntu 22.04 inkscape has round-off issues and
+      # .ico files because Ubuntu 22.04 ImageMagick gives different results
+      run: git --no-pager diff --exit-code HEAD -- . ':!ico' ':!svg'

export.py

@@ -22,22 +22,20 @@ def main():
         subprocess.run(
             [
                 "inkscape",
-                "-z",
-                "--file=" + svg[i],
-                "--export-plain-svg=" + plain_svg[i],
+                "--export-type=svg",
+                "--export-filename=" + plain_svg[i],
                 "--export-text-to-path",
+                svg[i],
             ]
         )
         print(" done.")
 
     # Compile regexes
     rgxes = [
-        re.compile('^\s+sodipodi:docname="((.|\n)*?")\n', re.M),
-        re.compile('^\s+inkscape:export="((.|\n)*?")\n', re.M),
-        re.compile('^\s+inkscape:version="((.|\n)*?")\n', re.M),
-        re.compile("^\s+<metadata\s+((.|\n)*?</metadata>)\n", re.M),
-        re.compile("^\s+<defs\s+((.|\n)*?/>)\n", re.M),
-        re.compile("^\s+<sodipodi:namedview\s+((.|\n)*?/>)\n", re.M),
+        re.compile(r'^\s+sodipodi:docname="((.|\n)*?")\n', re.M),
+        re.compile(r"^\s+<metadata\s+((.|\n)*?</metadata>)\n", re.M),
+        re.compile(r"^\s+<defs\s+((.|\n)*?/>)\n", re.M),
+        re.compile(r"^\s+<sodipodi:namedview\s+((.|\n)*?/>)\n", re.M),
     ]
 
     # Remove excess metadata from Inkscape and plain SVGs

rasterize.py

@@ -35,10 +35,10 @@ def rasterize(svg, raster_extension, raster_sizes):
                 subprocess.run(
                     [
                         "inkscape",
-                        "-z",
-                        "--file=" + svg,
-                        "--export-png=" + out_name,
+                        "--export-type=png",
+                        "--export-filename=" + out_name,
                         "--export-height=" + str(size),
+                        svg,
                     ]
                 )
             except FileNotFoundError: