css: Support for dark modeben/123-dark

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>

4 files changed, 246 insertions, 44 deletions

diff --git a/cgit.css b/cgit.css
index d4aadbf..cc5e234 100644
--- a/cgit.css
+++ b/cgit.css
@@ -893,3 +893,145 @@ div#cgit table.ssdiff td.space {
 div#cgit table.ssdiff td.space div {
 	min-height: 3em;
 }
+
+div#cgit span.libravatar img.onhover {
+        display: none;
+        border: 1px solid gray;
+        padding: 0px;
+        -webkit-border-radius: 4px;
+        -moz-border-radius: 4px;
+        border-radius: 4px;
+        width: 128px;
+        height: 128px;
+}
+
+div#cgit span.libravatar img.inline {
+        -webkit-border-radius: 3px;
+        -moz-border-radius: 3px;
+        border-radius: 3px;
+        width: 13px;
+        height: 13px;
+        margin-right: 0.2em;
+        opacity: 0.6;
+}
+
+div#cgit span.libravatar:hover > img.onhover {
+        display: block;
+        position: absolute;
+        margin-left: 1.5em;
+        background-color: #eeeeee;
+        box-shadow: 2px 2px 7px rgba(100,100,100,0.75);
+}
+
+/*
+   Color overrides for browsers running in dark mode.
+   "only all and ..." forces very old browsers to ignore the media query:
+   https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries#improving_compatibility_with_older_browsers
+*/
+:root { color-scheme: light dark; }
+@media only all and (prefers-color-scheme: dark) {
+	html, div#cgit { color: #eee; background: #171717; }
+	div#cgit a { color: #3af; }
+	div#cgit .diffstat-header a { color: #28d; }
+	div#cgit table#header td.main a { color: #eee; }
+	div#cgit table#header td.sub { color: #999; }
+	div#cgit table.tabs { border-bottom-color: #444; }
+	div#cgit table.tabs td a { color: #888; }
+	div#cgit table.tabs td a.active { color: #fff; background-color: #444; }
+	div#cgit div.path { color: #eee; background-color: #333; }
+	div#cgit div.content { border-bottom-color: #bbb; }
+	div#cgit table.list tr { background: #171717; }
+	div#cgit table.list tr.logheader { background: #171717; }
+	div#cgit table.list tr:nth-child(even) { background: #171717; }
+	div#cgit table.list tr:nth-child(odd) { background: #1f1f1f; }
+	div#cgit table.list tr:hover { background: #333; }
+	div#cgit table.list tr.nohover { background: #171717; }
+	div#cgit table.list tr.nohover:hover { background: #171717; }
+	div#cgit table.list tr.nohover-highlight:hover:nth-child(even) { background: #171717; }
+	div#cgit table.list tr.nohover-highlight:hover:nth-child(odd) { background: #1f1f1f; }
+	div#cgit table.list td.commitgraph .column1 { color: #f55; }
+	div#cgit table.list td.commitgraph .column2 { color: #5f5; }
+	div#cgit table.list td.commitgraph .column3 { color: #ff5; }
+	div#cgit table.list td.commitgraph .column4 { color: #55f; }
+	div#cgit table.list td.commitgraph .column5 { color: #f5f; }
+	div#cgit table.list td.commitgraph .column6 { color: #5ff; }
+	div#cgit table.list td a { color: #eee; }
+	div#cgit table.list td a.ls-dir { color: #28d; }
+	div#cgit table.list td a:hover { color: #3af; }
+	div#cgit table#downloads { border-color: #888; }
+	div#cgit table#downloads th { background-color: #333; }
+	div#cgit div#blob { border-color: #eee; }
+	div#cgit table.blob { border-top-color: #eee; }
+	div#cgit table.blob td.hashes,
+	div#cgit table.blob td.lines { color: #eee; }
+	div#cgit table.blob td.linenumbers { border-right-color: gray; }
+	div#cgit table.blob td.linenumbers a,
+	div#cgit table.ssdiff td.lineno a { color: gray; }
+	div#cgit table.blob td.linenumbers a:hover,
+	div#cgit table.ssdiff td.lineno a:hover { color: #eee; }
+	div#cgit table.blame div.alt:nth-child(even) { background: #171717; }
+	div#cgit table.blame div.alt:nth-child(odd) { background: #1f1f1f; }
+	div#cgit table.bin-blob { border-color: #eee; }
+	div#cgit table.bin-blob th { border-color: #888; }
+	div#cgit table.bin-blob td { border-left-color: #888; }
+	div#cgit div.cgit-panel table { border-color: #555; background-color: #282828; }
+	div#cgit div.notes { border-color: #661; background-color: #220; }
+	div#cgit table.diffstat { border-color: #555; background-color: #282828; }
+	div#cgit table.diffstat td span.modechange { color: #c66; }
+	div#cgit table.diffstat td.add a { color: #6c6; }
+	div#cgit table.diffstat td.del a { color: #c66; }
+	div#cgit table.diffstat td.upd a { color: #3af; }
+	div#cgit table.diffstat td.graph td.add { background-color: #3a3; }
+	div#cgit table.diffstat td.graph td.rem { background-color: #a33; }
+	div#cgit div.diffstat-summary { color: #777; }
+	div#cgit table.diff td div.head { color: #eee; }
+	div#cgit table.diff td div.hunk { color: #28d; }
+	div#cgit table.diff td div.add { color: #6c6; }
+	div#cgit table.diff td div.del { color: #c66; }
+	div#cgit table.list td.reposection { color: #777; }
+	div#cgit ul.pager a { color: #888; }
+	div#cgit span.age-mins { color: #7f7; }
+	div#cgit span.age-hours { color: #7f7; }
+	div#cgit span.age-days { color: #9d9; }
+	div#cgit span.age-weeks { color: #bbb; }
+	div#cgit span.age-months { color: #888; }
+	div#cgit span.age-years { color: #666; }
+	div#cgit span.insertions { color: #7f7; }
+	div#cgit span.deletions { color: #e33; }
+	div#cgit div.footer { color: #555; }
+	div#cgit div.footer a { color: #555; }
+	div#cgit a.branch-deco { color: #fff; background-color: #361; border-color: #3b2; }
+	div#cgit a.tag-deco { color: #fff; background-color: #650; border-color: #ba3; }
+	div#cgit a.tag-annotated-deco { color: #fff; background-color: #840; border-color: #b96; }
+	div#cgit a.remote-deco { color: #fff; background-color: #348; border-color: #67c; }
+	div#cgit a.deco { color: #fff; background-color: #922; border-color: #d55; }
+	div#cgit a.branch-deco:hover, div#cgit table.list td a.branch-deco:hover,
+	div#cgit a.tag-deco:hover, div#cgit table.list td a.tag-deco:hover,
+	div#cgit a.tag-annotated-deco:hover, div#cgit table.list td a.tag-annotated-deco:hover,
+	div#cgit a.remote-deco:hover, div#cgit table.list td a.remote-deco:hover,
+	div#cgit a.deco:hover, div#cgit table.list td a.deco:hover { color: #fff; }
+	div#cgit table.stats { border-color: #555; }
+	div#cgit table.stats th { background-color: #333; border-color: #555; }
+	div#cgit table.stats td { border-color: #555; }
+	div#cgit table.stats td.sum { color: #5C7E9B; }
+	div#cgit table.vgraph { border-color: #eee; }
+	div#cgit table.vgraph th { background-color: #1f1f1f; border-color: black; }
+	div#cgit table.vgraph div.bar { background-color: #1f1f1f; }
+	div#cgit table.hgraph { border-color: #eee; }
+	div#cgit table.hgraph th { background-color: #1f1f1f; border-color: #eee; }
+	div#cgit table.hgraph div.bar { background-color: #1f1f1f; }
+	div#cgit table.ssdiff td { border-left-color: #555; border-right-color: #555; }
+	div#cgit table.ssdiff td.add { color: #eee; background: #353; }
+	div#cgit table.ssdiff td.add_dark { color: #eee; background: #030; }
+	div#cgit table.ssdiff span.add { background: #030; }
+	div#cgit table.ssdiff td.del { color: #eee; background: #533; }
+	div#cgit table.ssdiff td.del_dark { color: #eee; background: #411; }
+	div#cgit table.ssdiff span.del { background: #300; }
+	div#cgit table.ssdiff td.changed { color: #eee; background: #553; }
+	div#cgit table.ssdiff td.changed_dark { color: #eee; background: #330; }
+	div#cgit table.ssdiff td.lineno { color: #eee; background: #1f1f1f; }
+	div#cgit table.ssdiff td.hunk { color: #eee; background: #0D3D64; border-top-color: #555; border-bottom-color: #555; }
+	div#cgit table.ssdiff td.head { border-top-color: #555; border-bottom-color: #555; }
+	div#cgit table.ssdiff td.head div.head { color: #eee; }
+	div#cgit table.ssdiff td.foot { border-top-color: #555; }
+}
diff --git a/filters/html-converters/md2html b/filters/html-converters/md2html
index dc20f42..90b10e8 100755
--- a/filters/html-converters/md2html
+++ b/filters/html-converters/md2html
@@ -4,6 +4,11 @@ import sys
 import io
 from pygments.formatters import HtmlFormatter
 from markdown.extensions.toc import TocExtension
+
+# 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')
 sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8')
 sys.stdout.write('''
@@ -287,10 +292,31 @@ div#cgit .markdown-body h1 a.toclink, div#cgit .markdown-body h2 a.toclink, div#
     background-color: transparent;
     border: none;
 }
+@media only all and (prefers-color-scheme: dark) {
+.markdown-body a.absent { color: #f33; }
+.markdown-body h1 .mini-icon-link, .markdown-body h2 .mini-icon-link, .markdown-body h3 .mini-icon-link, .markdown-body h4 .mini-icon-link, .markdown-body h5 .mini-icon-link, .markdown-body h6 .mini-icon-link { color: #eee; }
+div#cgit .markdown-body h1 a.toclink, div#cgit .markdown-body h2 a.toclink, div#cgit .markdown-body h3 a.toclink, div#cgit .markdown-body h4 a.toclink, div#cgit .markdown-body h5 a.toclink, div#cgit .markdown-body h6 a.toclink { color: #eee; }
+.markdown-body h1 { color: #eee; }
+.markdown-body h2 { border-bottom-color: #333; color: #eee; }
+.markdown-body h6 { color: #888; }
+.markdown-body hr { border-color: #333; }
+.markdown-body blockquote { border-left-color: #222; color: #888; }
+.markdown-body table th, .markdown-body table td { border-color: #333; }
+.markdown-body table tr { border-top-color: #333; background-color: #111; }
+.markdown-body table tr:nth-child(2n) { background-color: #070707; }
+.markdown-body span.frame span span { color: #ccc; }
+.markdown-body code, .markdown-body tt { border-color: #151515; background-color: #070707; }
+.markdown-body .highlight pre, .markdown-body pre { background-color: #070707; border-color: #333; }
 ''')
-sys.stdout.write(HtmlFormatter(style='pastie').get_style_defs('.highlight'))
+sys.stdout.write(HtmlFormatter(style=dark_style).get_style_defs('.highlight'))
 sys.stdout.write('''
-</style>   
+}
+@media (prefers-color-scheme: light) {
+''')
+sys.stdout.write(HtmlFormatter(style=light_style).get_style_defs('.highlight'))
+sys.stdout.write('''
+}
+</style>
 ''')
 sys.stdout.write("<div class='markdown-body'>")
 sys.stdout.flush()
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))
diff --git a/filters/syntax-highlighting.sh b/filters/syntax-highlighting.sh
index 840bc34..0429b0f 100755
--- a/filters/syntax-highlighting.sh
+++ b/filters/syntax-highlighting.sh
@@ -25,6 +25,20 @@
 # table.blob .kwb  { color:#830000; }
 # table.blob .kwc  { color:#000000; font-weight:bold; }
 # table.blob .kwd  { color:#010181; }
+# @media only all and (prefers-color-scheme: dark) { /* cgit addition for dark mode */
+# 	table.blob .num  { color:#ff814f; }
+# 	table.blob .esc  { color:#f60; }
+# 	table.blob .str  { color:#cc0; }
+# 	table.blob .dstr { color:#ffff7e; }
+# 	table.blob .slc  { color:#7f7c7f; }
+# 	table.blob .com  { color:#7e7c7e; }
+# 	table.blob .dir  { color:#7dff7d; }
+# 	table.blob .sym  { color:#eeeeee; }
+# 	table.blob .kwa  { color:#bb0; }
+# 	table.blob .kwb  { color:#0a0; }
+# 	table.blob .kwc  { color:#eeeeee; }
+# 	table.blob .kwd  { color:#7e7efe; }
+# }
 #
 #
 # Style definition file generated by highlight 2.6.14, http://www.andre-simon.de/
@@ -45,45 +59,57 @@
 # .hl.kwb  { color:#830000; }
 # .hl.kwc  { color:#000000; font-weight:bold; }
 # .hl.kwd  { color:#010181; }
-#
-#
-# Style definition file generated by highlight 3.8, http://www.andre-simon.de/
-#
-# body.hl { background-color:#e0eaee; }
-# pre.hl  { color:#000000; background-color:#e0eaee; font-size:10pt; font-family:'Courier New';}
-# .hl.num { color:#b07e00; }
-# .hl.esc { color:#ff00ff; }
-# .hl.str { color:#bf0303; }
-# .hl.pps { color:#818100; }
-# .hl.slc { color:#838183; font-style:italic; }
-# .hl.com { color:#838183; font-style:italic; }
-# .hl.ppc { color:#008200; }
-# .hl.opt { color:#000000; }
-# .hl.lin { color:#555555; }
-# .hl.kwa { color:#000000; font-weight:bold; }
-# .hl.kwb { color:#0057ae; }
-# .hl.kwc { color:#000000; font-weight:bold; }
-# .hl.kwd { color:#010181; }
-#
-#
-# Style definition file generated by highlight 3.13, http://www.andre-simon.de/
-#
-# body.hl { background-color:#e0eaee; }
-# pre.hl  { color:#000000; background-color:#e0eaee; font-size:10pt; font-family:'Courier New',monospace;}
-# .hl.num { color:#b07e00; }
-# .hl.esc { color:#ff00ff; }
-# .hl.str { color:#bf0303; }
-# .hl.pps { color:#818100; }
-# .hl.slc { color:#838183; font-style:italic; }
-# .hl.com { color:#838183; font-style:italic; }
-# .hl.ppc { color:#008200; }
-# .hl.opt { color:#000000; }
-# .hl.ipl { color:#0057ae; }
-# .hl.lin { color:#555555; }
-# .hl.kwa { color:#000000; font-weight:bold; }
-# .hl.kwb { color:#0057ae; }
-# .hl.kwc { color:#000000; font-weight:bold; }
-# .hl.kwd { color:#010181; }
+# @media only all and (prefers-color-scheme: dark) { /* cgit addition for dark mode */
+# 	pre.hl  { color:#eeeeee; background-color:#111; }
+# 	.hl.num  { color:#ff814f; }
+# 	.hl.esc  { color:#f60; }
+# 	.hl.str  { color:#cc0; }
+# 	.hl.dstr { color:#ffff7e; }
+# 	.hl.slc  { color:#7f7c7f; }
+# 	.hl.com  { color:#7e7c7e; }
+# 	.hl.dir  { color:#7dff7d; }
+# 	.hl.sym  { color:#eeeeee; }
+# 	.hl.line { color:#aaaaaa; }
+# 	.hl.mark { background-color:#444400; }
+# 	.hl.kwa  { color:#bb0; }
+# 	.hl.kwb  { color:#a0a; }
+# 	.hl.kwc  { color:#eeeeee; }
+# 	.hl.kwd  { color:#7e7efe; }
+# }
+#
+#
+# Style definition file generated by highlight 3.8 / 3.13 / 3.41, http://www.andre-simon.de/
+#
+# table.blob .num { color:#b07e00; }
+# table.blob .esc { color:#ff00ff; }
+# table.blob .str { color:#bf0303; }
+# table.blob .pps { color:#818100; }
+# table.blob .slc { color:#838183; font-style:italic; }
+# table.blob .com { color:#838183; font-style:italic; }
+# table.blob .ppc { color:#008200; }
+# table.blob .opt { color:#000000; }
+# table.blob .ipl { color:#0057ae; }
+# table.blob .lin { color:#555555; }
+# table.blob .kwa { color:#000000; font-weight:bold; }
+# table.blob .kwb { color:#0057ae; }
+# table.blob .kwc { color:#000000; font-weight:bold; }
+# table.blob .kwd { color:#010181; }
+# @media only all and (prefers-color-scheme: dark) { /* cgit addition for dark mode */
+# 	table.blob .num { color:#ff814f; }
+# 	table.blob .esc { color:#f60; }
+# 	table.blob .str { color:#cc0; }
+# 	table.blob .pps { color:#ffff7f; }
+# 	table.blob .slc { color:#7f7c7f; }
+# 	table.blob .com { color:#7e7c7e; }
+# 	table.blob .ppc { color:#8dd; }
+# 	table.blob .opt { color:#eeeeee; }
+# 	table.blob .ipl { color:#51a8ff; }
+# 	table.blob .lin { color:#aaaaaa; }
+# 	table.blob .kwa { color:#bb0; }
+# 	table.blob .kwb { color:#0a0; }
+# 	table.blob .kwc { color:#eeeeee; }
+# 	table.blob .kwd { color:#7e7efe; }
+# }
 #
 #
 # The following environment variables can be used to retrieve the configuration