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allow generated html being rendered in dark mode

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`<meta name="color-scheme" content="light dark" />` is a hint to the browsers
that the page can be rendered in light as well as in dark mode
and that the browser can apply corresponding defaults.

as we do not add css colors on our own,
this is sufficient for letting generated html messasge being rendered
in dark mode.

cmp. https://drafts.csswg.org/css-color-adjust/#color-scheme-prop

closes #4146
This commit is contained in:
B. Petersen
2023-03-12 19:40:37 +01:00
committed by bjoern
parent b14e59c5f3
commit 11ca698139
3 changed files with 52 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
src/plaintext.rs
View File

@@ -34,8 +34,13 @@ impl PlainText {
let lines = split_lines(&self.text);
let mut ret =
"<!DOCTYPE html>\n<html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" /></head><body>\n".to_string();
let mut ret = r#"<!DOCTYPE html>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="color-scheme" content="light dark" />
</head><body>
"#
.to_string();
for line in lines {
let is_quote = line.starts_with('>');
@@ -118,7 +123,10 @@ http://link-at-start-of-line.org
assert_eq!(
html,
r##"<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="color-scheme" content="light dark" />
</head><body>
line 1<br/>
line 2<br/>
line with <a href="https://link-mid-of-line.org">https://link-mid-of-line.org</a> and <a href="http://link-end-of-line.com/file?foo=bar%20">http://link-end-of-line.com/file?foo=bar%20</a><br/>
@@ -140,7 +148,10 @@ line with <a href="https://link-mid-of-line.org">https://link-mid-of-line.org</a
assert_eq!(
html,
r#"<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="color-scheme" content="light dark" />
</head><body>
line with &lt;<a href="http://encapsulated.link/?foo=_bar">http://encapsulated.link/?foo=_bar</a>&gt; here!<br/>
</body></html>
"#
@@ -158,7 +169,10 @@ line with &lt;<a href="http://encapsulated.link/?foo=_bar">http://encapsulated.l
assert_eq!(
html,
r#"<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="color-scheme" content="light dark" />
</head><body>
line with nohttp://no.link here<br/>
</body></html>
"#
@@ -176,7 +190,10 @@ line with nohttp://no.link here<br/>
assert_eq!(
html,
r#"<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="color-scheme" content="light dark" />
</head><body>
just an address: <a href="mailto:foo@bar.org">foo@bar.org</a> <a href="mailto:another@one.de">another@one.de</a><br/>
</body></html>
"#
@@ -194,7 +211,10 @@ just an address: <a href="mailto:foo@bar.org">foo@bar.org</a> <a href="mailto:an
assert_eq!(
html,
r#"<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="color-scheme" content="light dark" />
</head><body>
line still line<br/>
<em>&gt;quote </em><br/>
<em>&gt;still quote</em><br/>
@@ -215,7 +235,10 @@ line still line<br/>
assert_eq!(
html,
r#"<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="color-scheme" content="light dark" />
</head><body>
linestill line<br/>
<em>&gt;quote </em><br/>
<em>&gt;still quote</em><br/>
@@ -236,7 +259,10 @@ linestill line<br/>
assert_eq!(
html,
r#"<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="color-scheme" content="light dark" />
</head><body>
line <br/>
still line<br/>
<em>&gt;quote </em><br/>