Add color darkening

src/main.py

@@ -1,6 +1,6 @@
 from svgutils.compose import *
 from cairosvg import svg2png
-import toml, os
+import toml, os, re
 
 asset_path = "../assets/"
 CONFIG["svg.file_path"] = asset_path
@@ -17,10 +17,18 @@ with open("../assets/colors/base.toml", "r") as color_file: #Load the user confi
 os.makedirs("../output/vector/", exist_ok=True)
 os.makedirs("../output/" + str(config["raster_size"]) + "/", exist_ok=True)
 
+def DarkenColor(inputColor, percentage):
+  inputColor = inputColor.replace('0x', '').replace('#', '').upper()
+  valLen = int(len(inputColor) / 3)
+  outputColor = ""
+  for value in list(map(''.join, zip( * [iter(inputColor)] * valLen))):
+    outputColor += str(hex(int(int(value, 16) * ((100 - int(percentage)) / 100))))[2: ].zfill(valLen).upper()
+  return outputColor
+
 for key in designs:
   currentDesign = designs[key] #Select the current design which is a list of parts
   partsList = []
-  colors_out = {}
+  colorsOut = {}
   for part in currentDesign:
     for url in definitions[part]:
       partsList.append(url) #For each part add each element to the list
@@ -30,7 +38,7 @@ for key in designs:
       if "color" in part:
         with open(asset_path + part) as transform_file:
           swaps = toml.loads(transform_file.read())
-          colors_out.update(swaps)
+          colorsOut.update(swaps)
       else:
         with open(asset_path + part) as transform_file:
           transforms = toml.loads(transform_file.read())
@@ -39,15 +47,21 @@ for key in designs:
       svg_parts.append(SVG(part)) #Add each element of the list of paths to a new list as a SVG element
   Figure("128","128", *svg_parts, SVG("credits.svg")).save(f"../output/vector/{key}.svg") #Compile all parts into an SVG
   
-  with open(f"../output/vector/{key}.svg", "r") as in_file:
-    in_lines = in_file.read()
-  for color_key in colors_out:
-    if base_colors[color_key].lower() in in_lines.lower():
-      pattern = re.compile(base_colors[color_key], re.IGNORECASE)
-      in_lines = pattern.sub(colors_out[color_key].lower(), in_lines)
+  with open(f"../output/vector/{key}.svg", "r") as inFile:
+    inLines = inFile.read()
+  for colorKey in colorsOut:
+    if base_colors[colorKey].lower() in inLines.lower():
+      pattern = re.compile(base_colors[colorKey], re.IGNORECASE)
+      inLines = pattern.sub(colorsOut[colorKey].lower(), inLines)
+  if "DARKEN" in inLines:
+    darkenMatches =  re.findall("(#DARKEN\( ?((?:(?:[a-f]|[A-F]|[0-9]){3}){1,2}) ?\, ?(\d{1,2}) ?\))", inLines)
+    if darkenMatches:
+      for match in darkenMatches:
+        newColor = DarkenColor(match[1], match[2])
+        inLines = inLines.replace(match[0], "#"+newColor.lower())
 
   with open(f"../output/vector/{key}.svg", "w") as out_file:
-    out_file.write(in_lines)
+    out_file.write(inLines)
 
   if config["raster_images"]: #Create png of designated size
     svg2png(