Add --gradient option, allow specification of custom gradients.

Closes #47

1 files changed, 24 insertions, 0 deletions

diff --git a/xterm256lut_gen.py b/xterm256lut_gen.py
new file mode 100644
index 0000000..16d8f4b
--- /dev/null
+++ b/xterm256lut_gen.py
@@ -0,0 +1,24 @@
+
+xterm_colors = []
+
+# This is ripped out of pygments
+# I leave out the 16 standard colors since people tend to re-define them to their liking.
+
+# colors 16..232: the 6x6x6 color cube
+_valuerange = (0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff)
+for i in range(217):
+	r = _valuerange[(i // 36) % 6]
+	g = _valuerange[(i // 6) % 6]
+	b = _valuerange[i % 6]
+	xterm_colors.append((r, g, b))
+
+# colors 233..253: grayscale
+for i in range(1, 24):
+	v = 8 + i * 10
+	xterm_colors.append((v, v, v))
+
+print('/* GENERATED HEADER FILE DO NOT EDIT */')
+print('union rgb_c xterm256lut[256-16] = {')
+for r,g,b in xterm_colors:
+    print(f'    {{{{0x{b:02x}, 0x{g:02x}, 0x{r:02x}}}}},');
+print('};');