Add a dark theme for code blocks

Now that code highlighting is just a normal stylesheet, it's easy to add a separate set of dark-mode rules. Do so and update the documentation. Fixes #24
jeffreytse · Aug 24, 2023 · 6418e50 · 6418e50
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commit 6418e50
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diff --git a/_config.yml b/_config.yml
@@ -156,13 +156,20 @@ yat:
 # use. This setting affects both Markdown code blocks and Liquid `highlight`
 # blocks. You can set it to `none` to disable highlighting.
 #
-# By default, we highlight code with Rouge's "github.light" theme. If you want
-# to change that, you can override `assets/css/code-highlight-rouge.css` with a
-# different stylesheet generated with Rouge's `rougify` command. If you do so,
-# you must set the CSS scope to `.highlight pre` for proper rendering:
+# By default, we highlight code with Rouge's "github.light" and `github.dark`
+# themes for light and dark mode, respectively. If you want to change that, you
+# can override `assets/css/code-highlight-rouge.css` with a different
+# stylesheet generated with Rouge's `rougify` command. If you do so, you must
+# set the CSS scope to `.highlight pre` for your light-mode theme:
 #
 #   $ mkdir -p assets/css
 #   $ bundle exec rougify style --scope '.highlight pre' <THEME> >assets/css/code-highlight-rouge.css
+#
+# ...and to `html[data-theme="dark"] .highlight pre` for your dark-mode theme.
+# A dark-mode theme is optional, but if you want one just append its stylesheet
+# to the same CSS file (note the >>):
+#
+#   $ bundle exec rougify style --scope 'html[data-theme="dark"] .highlight pre' <DARK_THEME> >>assets/css/code-highlight-rouge.css
 # highlighter: rouge
 
 # If you want to link only specific pages in your header, uncomment

diff --git a/_sass/yat/_dark.scss b/_sass/yat/_dark.scss
@@ -30,6 +30,10 @@ html[data-theme="dark"]  {
     background-color: #454545;
   }
 
+  pre {
+    background-color: #222222;
+  }
+
   blockquote {
     border-left: 4px solid #484848;
   }

diff --git a/assets/css/code-highlight-rouge.css b/assets/css/code-highlight-rouge.css
@@ -110,3 +110,115 @@
   color: #24292f;
   font-weight: bold;
 }
+html[data-theme="dark"] .highlight pre table td { padding: 5px; }
+html[data-theme="dark"] .highlight pre table pre { margin: 0; }
+html[data-theme="dark"] .highlight pre, html[data-theme="dark"] .highlight pre .w {
+  color: #c9d1d9;
+  background-color: #161b22;
+}
+html[data-theme="dark"] .highlight pre .k, html[data-theme="dark"] .highlight pre .kd, html[data-theme="dark"] .highlight pre .kn, html[data-theme="dark"] .highlight pre .kp, html[data-theme="dark"] .highlight pre .kr, html[data-theme="dark"] .highlight pre .kt, html[data-theme="dark"] .highlight pre .kv {
+  color: #ff7b72;
+}
+html[data-theme="dark"] .highlight pre .gr {
+  color: #f0f6fc;
+}
+html[data-theme="dark"] .highlight pre .gd {
+  color: #ffdcd7;
+  background-color: #67060c;
+}
+html[data-theme="dark"] .highlight pre .nb {
+  color: #ffa657;
+}
+html[data-theme="dark"] .highlight pre .nc {
+  color: #ffa657;
+}
+html[data-theme="dark"] .highlight pre .no {
+  color: #ffa657;
+}
+html[data-theme="dark"] .highlight pre .nn {
+  color: #ffa657;
+}
+html[data-theme="dark"] .highlight pre .sr {
+  color: #7ee787;
+}
+html[data-theme="dark"] .highlight pre .na {
+  color: #7ee787;
+}
+html[data-theme="dark"] .highlight pre .nt {
+  color: #7ee787;
+}
+html[data-theme="dark"] .highlight pre .gi {
+  color: #aff5b4;
+  background-color: #033a16;
+}
+html[data-theme="dark"] .highlight pre .kc {
+  color: #79c0ff;
+}
+html[data-theme="dark"] .highlight pre .l, html[data-theme="dark"] .highlight pre .ld, html[data-theme="dark"] .highlight pre .m, html[data-theme="dark"] .highlight pre .mb, html[data-theme="dark"] .highlight pre .mf, html[data-theme="dark"] .highlight pre .mh, html[data-theme="dark"] .highlight pre .mi, html[data-theme="dark"] .highlight pre .il, html[data-theme="dark"] .highlight pre .mo, html[data-theme="dark"] .highlight pre .mx {
+  color: #79c0ff;
+}
+html[data-theme="dark"] .highlight pre .sb {
+  color: #79c0ff;
+}
+html[data-theme="dark"] .highlight pre .bp {
+  color: #79c0ff;
+}
+html[data-theme="dark"] .highlight pre .ne {
+  color: #79c0ff;
+}
+html[data-theme="dark"] .highlight pre .nl {
+  color: #79c0ff;
+}
+html[data-theme="dark"] .highlight pre .py {
+  color: #79c0ff;
+}
+html[data-theme="dark"] .highlight pre .nv, html[data-theme="dark"] .highlight pre .vc, html[data-theme="dark"] .highlight pre .vg, html[data-theme="dark"] .highlight pre .vi, html[data-theme="dark"] .highlight pre .vm {
+  color: #79c0ff;
+}
+html[data-theme="dark"] .highlight pre .o, html[data-theme="dark"] .highlight pre .ow {
+  color: #79c0ff;
+}
+html[data-theme="dark"] .highlight pre .gh {
+  color: #1f6feb;
+  font-weight: bold;
+}
+html[data-theme="dark"] .highlight pre .gu {
+  color: #1f6feb;
+  font-weight: bold;
+}
+html[data-theme="dark"] .highlight pre .s, html[data-theme="dark"] .highlight pre .sa, html[data-theme="dark"] .highlight pre .sc, html[data-theme="dark"] .highlight pre .dl, html[data-theme="dark"] .highlight pre .sd, html[data-theme="dark"] .highlight pre .s2, html[data-theme="dark"] .highlight pre .se, html[data-theme="dark"] .highlight pre .sh, html[data-theme="dark"] .highlight pre .sx, html[data-theme="dark"] .highlight pre .s1, html[data-theme="dark"] .highlight pre .ss {
+  color: #a5d6ff;
+}
+html[data-theme="dark"] .highlight pre .nd {
+  color: #d2a8ff;
+}
+html[data-theme="dark"] .highlight pre .nf, html[data-theme="dark"] .highlight pre .fm {
+  color: #d2a8ff;
+}
+html[data-theme="dark"] .highlight pre .err {
+  color: #f0f6fc;
+  background-color: #8e1519;
+}
+html[data-theme="dark"] .highlight pre .c, html[data-theme="dark"] .highlight pre .ch, html[data-theme="dark"] .highlight pre .cd, html[data-theme="dark"] .highlight pre .cm, html[data-theme="dark"] .highlight pre .cp, html[data-theme="dark"] .highlight pre .cpf, html[data-theme="dark"] .highlight pre .c1, html[data-theme="dark"] .highlight pre .cs {
+  color: #8b949e;
+}
+html[data-theme="dark"] .highlight pre .gl {
+  color: #8b949e;
+}
+html[data-theme="dark"] .highlight pre .gt {
+  color: #8b949e;
+}
+html[data-theme="dark"] .highlight pre .ni {
+  color: #c9d1d9;
+}
+html[data-theme="dark"] .highlight pre .si {
+  color: #c9d1d9;
+}
+html[data-theme="dark"] .highlight pre .ge {
+  color: #c9d1d9;
+  font-style: italic;
+}
+html[data-theme="dark"] .highlight pre .gs {
+  color: #c9d1d9;
+  font-weight: bold;
+}