Partial solution to remove ImageMagick dependency

The convert.py script will do the necessary scaling and changing of
colors instead of ImageMagick. Inkscape is still required to do the
final conversion of svg to png.

Requires lxml python package but in theory, can modify it to just do the
svg transformations using plain regex.

convert.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+import os
+import lxml.etree as ET
+
+def inkscape_export_svg2png(color, src_path, dst_path):
+    NS = {"svg" : 'http://www.w3.org/2000/svg'}
+    FRAC = 0.7
+    TEMPFILE = 'temp.svg'
+
+    dom = ET.parse(src_path)
+    root = dom.getroot()
+    width, height = int(root.attrib['width']), int(root.attrib['height'])
+    interval = (1-FRAC)*width/2
+
+    elements = root.findall('svg:path', namespaces=NS)
+    group = ET.SubElement(root, "g")
+    for element in elements:
+        element.attrib['style'] = f'fill:{color};fill-opacity:1'
+        group.append(element)
+    group.attrib['transform'] = f"matrix({FRAC},0,0,{FRAC},{interval},{interval})"
+
+    et = ET.ElementTree(root)
+    et.write(TEMPFILE, pretty_print=True)
+
+    cmd = f"inkscape --export-filename='{dst_path}' {TEMPFILE} -w 72 2>/dev/null"
+    exit_code = os.system(cmd)
+    os.remove(TEMPFILE)
+    return exit_code
+
+def magick_convert_svg2png(color, src_path, dst_path):
+    command = (
+        r"convert -trim -scale 36x36 -extent 72x72 -gravity center "
+        r"-define png:color-type=6 -background none -colorspace sRGB -channel RGB "
+        rf"-threshold -1 -density 300 -fill \{color} +opaque none "
+        rf"{src_path} {dst_path}"
+        )
+    return os.system(command)
+
+if __name__ == '__main__':
+    for file in os.listdir('./icons'):
+        basename, ext = os.path.splitext(file)
+        if ext == '.svg':
+            inkscape_export_svg2png('#FFFFFF', f'icons/{basename}.svg', f'icons/INK_{basename}.png')

matter.py

@@ -11,6 +11,8 @@
 from subprocess import run, check_call, PIPE
 from shutil import which, rmtree, copytree, copyfile
 
+from convert import inkscape_export_svg2png
+
 # Configuration constants
 
 MIN_PYTHON_VERSION = (3, 6)  # Mainly for f-strings
@@ -248,13 +250,14 @@ def convert_icon_svg2png(icon_name):
     )
     src_path = ICON_SVG_PATHF.format(icon_name)
     dst_path = ICON_PNG_PATHF.format(icon_name)
-    command = (
-        r"convert -trim -scale 36x36 -extent 72x72 -gravity center "
-        r"-define png:color-type=6 -background none -colorspace sRGB -channel RGB "
-        rf"-threshold -1 -density 300 -fill \{color} +opaque none "
-        rf"{src_path} {dst_path}"
-    )
-    exit_code = sh(command)
+    # command = (
+        # r"convert -trim -scale 36x36 -extent 72x72 -gravity center "
+        # r"-define png:color-type=6 -background none -colorspace sRGB -channel RGB "
+        # rf"-threshold -1 -density 300 -fill \{color} +opaque none "
+        # rf"{src_path} {dst_path}"
+    # )
+    # exit_code = sh(command)
+    exit_code = inkscape_export_svg2png(color, src_path, dst_path)
     if exit_code != 0:
         error("Stop. The convert command returned an error")