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#!/bin/sh
# mdview - simple markdown viewer
# Usage: mdview [--light|--dark|--auto] [--live] <file.md>
theme="auto"
live_mode=0
filename=""
# lang="en" - maybe support language tags later
for arg in "$@"; do
case "$arg" in
--light) theme="light" ;;
--dark) theme="dark" ;;
--auto) theme="auto" ;;
--live|-w) live_mode=1 ;;
--help|-h)
echo "Usage: mdview [--light|--dark|--auto] [--live] <file.md>"
echo " --light Light theme"
echo " --dark Dark theme"
echo " --auto Follow system (default)"
echo " --live Watch file for changes"
exit 0
;;
*) filename="$arg" ;;
esac
done
if [ -z "$filename" ]; then
echo "Usage: mdview [--light|--dark|--auto] [--live] <file.md>" >&2
exit 1
fi
# Resolve the base directory for relative paths
if [ "$filename" = "-" ]; then
base_dir="file://$(pwd)/"
else
base_dir="file://$(cd "$(dirname "$filename")" && pwd)/"
fi
case "$theme" in
light)
css_file="$HOME/.config/mdview/github-markdown-light.css"
page_background="#ffffff"
page_scheme="light"
;;
dark)
css_file="$HOME/.config/mdview/github-markdown-dark.css"
page_background="#0d1117"
page_scheme="dark"
;;
auto)
css_file="$HOME/.config/mdview/github-markdown.css"
page_background="Canvas"
page_scheme="light dark"
;;
esac
html() {
if [ "$filename" = "-" ]; then
body=$(cat | cmark-gfm --width 80 --unsafe)
else
body=$(cmark-gfm --width 80 --unsafe "$filename")
fi
cat <<EOF
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<base href="$base_dir">
<style>
:root {
color-scheme: $page_scheme;
}
html,
body {
min-height: 100%;
}
body {
margin: 0;
background-color: $page_background;
}
.markdown-body {
box-sizing: border-box;
min-width: 200px;
max-width: 980px;
min-height: 100vh;
margin: 0 auto;
padding: 45px;
}
@media (max-width: 767px) {
.markdown-body {
padding: 15px;
}
}
</style>
</head>
<body>
<article class="markdown-body">
$body
</article>
</body>
</html>
EOF
}
if [ "$live_mode" -eq 1 ]; then
if [ "$filename" = "-" ]; then
echo "mdview: --live cannot be used with standard input" >&2
exit 1
fi
tmp=$(mktemp /tmp/mdview_live_XXXXXX.html)
surf_pid=""
cleanup() {
[ -n "$surf_pid" ] && kill "$surf_pid" 2>/dev/null
rm -f "$tmp"
}
render() {
html > "$tmp" || return 1
if [ -n "$surf_pid" ]; then
kill -HUP "$surf_pid" 2>/dev/null || return 1
fi
}
trap cleanup EXIT INT TERM
render || exit 1
echo "Live preview: $filename (theme: $theme)"
echo "Press Ctrl+C to stop"
# -d disables surf's disk cache.
surf -d -C "$css_file" "$tmp" &
surf_pid=$!
old_sum=$(cksum < "$filename") || exit 1
while kill -0 "$surf_pid" 2>/dev/null; do
sleep 1
new_sum=$(cksum < "$filename") || continue
[ "$new_sum" = "$old_sum" ] && continue
old_sum=$new_sum
if render; then
echo "Updated: $filename"
fi
done
else
tmp=$(mktemp /tmp/mdview_XXXXXX.html)
html > "$tmp"
surf -C "$css_file" "$tmp"
rm -f "$tmp"
fi
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