colorschemes: add script to generate faint colors

data/colorschemes/gen_faint.py

@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+
+import argparse
+import configparser
+import sys
+from ini2desc import parse_color
+
+def blend_color(cfg, blend_factor, color_name):
+    (r1, g1, b1, a1) = parse_color(cfg.get('Colors', 'bg'))
+    (r2, g2, b2, a2) = parse_color(cfg.get('Normal', color_name))
+    def blend(c1, c2, f):
+        d = c2 - c1
+        return int(c1 + d * f)
+    r = blend(r1, r2, blend_factor)
+    g = blend(g1, g2, blend_factor)
+    b = blend(b1, b2, blend_factor)
+    a = blend(a1, a2, blend_factor)
+    if a != 255:
+        cfg.set('Faint', color_name,
+                '#{:02x}{:02x}{:02x}{:02x}'.format(r, g, b, a))
+    else:
+        cfg.set('Faint', color_name,
+                '#{:02x}{:02x}{:02x}'.format(r, g, b))
+
+def main():
+    parser = argparse.ArgumentParser(description='Generate Faint colors in INI colorschemes description files.')
+    parser.add_argument('input_file',
+                        type=argparse.FileType('r'),
+                        help='INI File to convert')
+    parser.add_argument('blend_factor',
+                        type=int, nargs='?', default=70,
+                        help='blend factor between normal color and background')
+    args = parser.parse_args()
+
+    cfg = configparser.ConfigParser()
+    cfg.read_file(args.input_file)
+
+    f = args.blend_factor
+
+    assert( 0 < f and f < 100)
+    f = f / 100
+
+    if not cfg.has_section('Faint'):
+        cfg.add_section('Faint')
+
+    blend_color(cfg, f, 'def')
+    blend_color(cfg, f, 'black')
+    blend_color(cfg, f, 'red')
+    blend_color(cfg, f, 'green')
+    blend_color(cfg, f, 'yellow')
+    blend_color(cfg, f, 'blue')
+    blend_color(cfg, f, 'magenta')
+    blend_color(cfg, f, 'cyan')
+    blend_color(cfg, f, 'white')
+    blend_color(cfg, f, 'inverse_fg')
+    blend_color(cfg, f, 'inverse_bg')
+
+    cfg.write(sys.stdout)
+
+
+if __name__ == "__main__":
+    main()