css: Support for dark mode

Modern browsers have a "dark mode" preference, which enables alternate
styles on web sites that support this.

This patch adds a dark color scheme, that is automatically activated
via a CSS @media query.

Older browsers that do not support color schemes will simply show the
light scheme, but possibly without syntax highlighting.

Note that filters that use color (such as source highlighters) and
logotypes may need to be updated to work with a black background!
See the updated files in the filters/ directory.

Signed-off-by: Samuel Lidén Borell <samuel@kodafritt.se>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/filters/syntax-highlighting.py b/filters/syntax-highlighting.py
index e912594..f2c0fe1 100755
--- a/filters/syntax-highlighting.py
+++ b/filters/syntax-highlighting.py
@@ -29,12 +29,16 @@ from pygments.lexers import guess_lexer
 from pygments.lexers import guess_lexer_for_filename
 from pygments.formatters import HtmlFormatter
 
+# The dark style is automatically selected if the browser is in dark mode
+light_style='pastie'
+dark_style='monokai'
 
 sys.stdin = io.TextIOWrapper(sys.stdin.buffer, encoding='utf-8', errors='replace')
 sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8', errors='replace')
 data = sys.stdin.read()
 filename = sys.argv[1]
-formatter = HtmlFormatter(style='pastie', nobackground=True)
+light_formatter = HtmlFormatter(style=light_style, nobackground=True)
+dark_formatter = HtmlFormatter(style=dark_style, nobackground=True)
 
 try:
 	lexer = guess_lexer_for_filename(filename, data)
@@ -50,6 +54,10 @@ except TypeError:
 # highlight! :-)
 # printout pygments' css definitions as well
 sys.stdout.write('<style>')
-sys.stdout.write(formatter.get_style_defs('.highlight'))
+sys.stdout.write('\n@media only all and (prefers-color-scheme: dark) {\n')
+sys.stdout.write(dark_formatter.get_style_defs('.highlight'))
+sys.stdout.write('\n}\n@media (prefers-color-scheme: light) {\n')
+sys.stdout.write(light_formatter.get_style_defs('.highlight'))
+sys.stdout.write('\n}\n')
 sys.stdout.write('</style>')
-sys.stdout.write(highlight(data, lexer, formatter, outfile=None))
+sys.stdout.write(highlight(data, lexer, light_formatter, outfile=None))