general: Add -a to support terminal transparency.

pywal/__main__.py

@@ -29,6 +29,10 @@ def get_args():
     description = "wal - Generate colorschemes on the fly"
     arg = argparse.ArgumentParser(description=description)
 
+    arg.add_argument("-a", metavar="\"alpha\"",
+                     help="Set terminal background transparency. \
+                           *Only works in URxvt*")
+
     arg.add_argument("-c", action="store_true",
                      help="Delete all cached colorschemes.")
 
@@ -86,6 +90,9 @@ def process_args(args):
     if args.r:
         reload.colors(args.t)
 
+    if args.a:
+        util.Color.alpha_num = args.a
+
     if args.i:
         image_file = image.get(args.i)
         colors_plain = colors.get(image_file, notify=not args.q)

pywal/reload.py

@@ -48,7 +48,7 @@ def colors(vte, cache_dir=__cache_dir__):
 
         # If vte mode was used, remove the unsupported sequence.
         if vte:
-            sequences = re.sub(r"\]708;\#.{6}", "", sequences)
+            sequences = re.sub(r"\]708;(\[..\])?\#.{6}", "", sequences)
 
         print(sequences, end="")
 

pywal/sequences.py

@@ -9,6 +9,11 @@ from . import util
 
 def set_special(index, color):
     """Convert a hex color to a special sequence."""
+    alpha = util.Color.alpha_num
+
+    if index in [11, 708] and alpha != 100:
+        return f"\033]{index};[{alpha}]{color}\007"
+
     return f"\033]{index};{color}\007"
 
 

pywal/templates/colors.Xresources

@@ -2,7 +2,7 @@
 ! Generated by 'wal'
 URxvt*foreground:  {foreground}
 XTerm*foreground:  {foreground}
-URxvt*background:  {background}
+URxvt*background:  {background.alpha}
 XTerm*background:  {background}
 URxvt*cursorColor: {cursor}
 XTerm*cursorColor: {cursor}
@@ -60,3 +60,6 @@ XClock*minorColor:  rgba:{color15.xrgba}
 XClock*hourColor:   rgba:{color15.xrgba}
 XClock*minuteColor: rgba:{color15.xrgba}
 XClock*secondColor: rgba:{color15.xrgba}
+
+! Set depth to make transparency work.
+URxvt*depth: 32

pywal/util.py

@@ -9,6 +9,8 @@ import subprocess
 
 class Color:
     """Color formats."""
+    alpha_num = 100
+
     def __init__(self, hex_color):
         self.hex_color = hex_color
 
@@ -25,6 +27,11 @@ class Color:
         """Convert a hex color to xrdb rgba."""
         return hex_to_xrgba(self.hex_color)
 
+    @property
+    def alpha(self):
+        """Add URxvt alpha value to color."""
+        return f"[{self.alpha_num}]{self.hex_color}"
+
 
 def set_grey(colors):
     """Set a grey color based on the brightness