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gh-129939: Add darkmode support for difflib's comparison pages #129940

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Feb 11, 2025
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gh-129939: Add darkmode support for difflib's comparison pages #129940

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Add darkmode support for difflib's comparison pages
Wulian233 Feb 10, 2025
ff66981
whatsnew
Wulian233 Feb 10, 2025
3cfd78d
WCAG AA
Wulian233 Feb 10, 2025
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Wulian233 Feb 11, 2025
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7 changes: 7 additions & 0 deletions Doc/whatsnew/3.14.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -410,6 +410,13 @@ decimal
:meth:`Decimal.from_number() <decimal.Decimal.from_number>`.
(Contributed by Serhiy Storchaka in :gh:`121798`.)

difflib
-------

* Comparison pages with highlighted changes generated by the
:class:`difflib.HtmlDiff` class now support dark mode.
(Contributed by Jiahao Li in :gh:`129939`.)

dis
---

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13 changes: 11 additions & 2 deletions Lib/difflib.py
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Expand Up @@ -1632,13 +1632,22 @@ def _line_pair_iterator():
</html>"""

_styles = """
:root {color-scheme: light dark}
table.diff {font-family:Courier; border:medium;}
.diff_header {background-color:#e0e0e0}
td.diff_header {text-align:right}
.diff_next {background-color:#c0c0c0}
.diff_add {background-color:#aaffaa}
.diff_add {background-color:palegreen}
.diff_chg {background-color:#ffff77}
.diff_sub {background-color:#ffaaaa}"""
.diff_sub {background-color:#ffaaaa}

@media (prefers-color-scheme: dark) {
.diff_header {background-color:#666}
.diff_next {background-color:#444}
.diff_add {background-color:darkgreen}
.diff_chg {background-color:goldenrod}
.diff_sub {background-color:darkred}
}"""

_table_template = """
<table class="diff" id="difflib_chg_%(prefix)s_top"
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11 changes: 10 additions & 1 deletion Lib/test/test_difflib_expect.html
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Expand Up @@ -9,13 +9,22 @@
content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
:root {color-scheme: light dark}
table.diff {font-family:Courier; border:medium;}
.diff_header {background-color:#e0e0e0}
td.diff_header {text-align:right}
.diff_next {background-color:#c0c0c0}
.diff_add {background-color:#aaffaa}
.diff_add {background-color:palegreen}
.diff_chg {background-color:#ffff77}
.diff_sub {background-color:#ffaaaa}

@media (prefers-color-scheme: dark) {
.diff_header {background-color:#666}
.diff_next {background-color:#444}
.diff_add {background-color:darkgreen}
.diff_chg {background-color:goldenrod}
.diff_sub {background-color:darkred}
}
</style>
</head>

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2025-02-10-14-34-34.gh-issue-129939.B08L4e.rst
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@@ -0,0 +1,2 @@
Comparison pages with highlighted changes generated by the
:class:`difflib.HtmlDiff` class now support dark mode.
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