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Add copy button to code blocks #54

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Merged
patakuti merged 3 commits into from
Jun 18, 2026
Merged

Add copy button to code blocks #54

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326d898
Add copy button to code blocks
patakuti Jun 18, 2026
d29b8d2
Fix trailing newlines in copied code
patakuti Jun 18, 2026
67a7abb
Fix extra newlines in copied code by using textContent
patakuti Jun 18, 2026
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89 changes: 89 additions & 0 deletions internal/template/copybutton.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,89 @@
package template

const copyButtonCSS = `
.markdown-body pre {
position: relative;
}
.copy-btn {
position: absolute;
top: 6px;
right: 6px;
padding: 3px 8px;
font-size: 11px;
line-height: 1.5;
border-radius: 4px;
border: 1px solid transparent;
cursor: pointer;
opacity: 0;
transition: opacity 0.15s ease, background-color 0.15s ease;
}
.markdown-body pre:hover .copy-btn,
.copy-btn:focus {
opacity: 1;
}
.copy-btn.copied {
opacity: 1;
}
.theme-github .copy-btn,
.theme-simple .copy-btn {
background: #fff;
color: #444;
border-color: #d0d7de;
}
.theme-github .copy-btn:hover,
.theme-simple .copy-btn:hover {
background: #f3f4f6;
border-color: #adb5bd;
}
.theme-github .copy-btn.copied,
.theme-simple .copy-btn.copied {
background: #d4edda;
color: #155724;
border-color: #c3e6cb;
}
.theme-dark .copy-btn {
background: #21262d;
color: #c9d1d9;
border-color: #30363d;
}
.theme-dark .copy-btn:hover {
background: #2d333b;
border-color: #6e7681;
}
.theme-dark .copy-btn.copied {
background: #1a3d2b;
color: #3fb950;
border-color: #2ea043;
}
@media print {
.copy-btn { display: none !important; }
}
`

const copyButtonJS = `<script>
(function() {
document.addEventListener('DOMContentLoaded', function() {
document.querySelectorAll('.markdown-body pre').forEach(function(pre) {
var btn = document.createElement('button');
btn.className = 'copy-btn';
btn.textContent = 'Copy';
btn.addEventListener('click', function() {
var code = pre.querySelector('code');
var text = (code ? code.textContent : pre.textContent).replace(/\n+$/, '');
navigator.clipboard.writeText(text).then(function() {
btn.textContent = 'Copied!';
btn.classList.add('copied');
setTimeout(function() {
btn.textContent = 'Copy';
btn.classList.remove('copied');
}, 2000);
}).catch(function() {
btn.textContent = 'Error';
setTimeout(function() { btn.textContent = 'Copy'; }, 2000);
});
});
pre.appendChild(btn);
});
});
})();
</script>`
2 changes: 2 additions & 0 deletions internal/template/template.go
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,7 @@ const markdownPageTplHead = `<!DOCTYPE html>
<style>` + commonCSS + `</style>
<style>` + lineAnchorCSS + `</style>
<style>` + tocCSS + `</style>
<style>` + copyButtonCSS + `</style>
`

const markdownPageTplTail = `<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.11/dist/katex.min.css">
Expand Down Expand Up @@ -156,6 +157,7 @@ document.addEventListener('DOMContentLoaded', function() {
</script>
` + lineAnchorJS + `
` + tocJS + `
` + copyButtonJS + `
{{if .WatchPath}}
<script>
(function() {
Expand Down
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