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path: root/src/git-permalink.sh
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#!/bin/sh
set -eu

FILE="${1:-}"
MYLINENO="${2:-}"
COMMIT="$(git rev-parse HEAD)"
ORIGIN="$(git config --get remote.origin.url)"
REPOSITORY="$(basename "$PWD")"

usage() {
	printf 'Usage:  %s [-p] FILE [LINENO]\n' "$0"
}

help() {
	cat <<EOF

Options:
  -p             only print the link, don't try to open it
  -h, --help     show this help
  -V, --version  print the version number
EOF
}

version() {
	echo 'git-permalink-@VERSION@ @DATE@'
}

if [ -z "$FILE" ]; then
	printf "Missing \$FILE argument\n\n" >&2
	usage >&2
	exit 2
fi

PRINTONLY=false
for flag in $@; do
	case "$flag" in
		-h|--help)
			usage
			help
			exit
			;;
		-V|--version)
			version
			exit
			;;
		-p)
			PRINTONLY=true
			shift
			;;
		*)
			;;
	esac
done

euandreh() {
	printf 'https://git.euandreh.xyz/%s/tree/%s?id=%s%s\n' "$REPOSITORY" "$FILE" "$COMMIT" "${MYLINENO:+#n$MYLINENO}"
}

sourcehut() {
	printf '%s/tree/%s/item/%s%s\n' "$ORIGIN" "$COMMIT" "$FILE" "${MYLINENO:+#L$MYLINENO}"
}

savannah() {
	printf '%s/tree/%s?id=%s%s\n' "$(echo "$ORIGIN" | sed 's|gnu.org/git|gnu.org/cgit|')" "$FILE" "$COMMIT" "${MYLINENO:+#n$MYLINENO}"
}

gitlab() {
	if echo "$ORIGIN" | grep -q '^git@gitlab.com:'; then
		NAME="$(echo "$ORIGIN" | cut -d: -f2 | cut -d/ -f1)"
		ORIGIN="https://gitlab.com/$NAME/$REPOSITORY"
	fi
	printf '%s/-/blob/%s/%s%s\n' "$ORIGIN" "$COMMIT" "$FILE" "${MYLINENO:+#L$MYLINENO}"
}

damnyou_github() {
	if echo "$MYLINENO" | grep -q -- -; then
		P1="$(echo "$MYLINENO" | cut -d- -f1)"
		P2="$(echo "$MYLINENO" | cut -d- -f2)"
		printf '#L%s-L%s' "$P1" "$P2"
	elif [ -n "$MYLINENO" ]; then
		printf '#L%s' "${MYLINENO}"
	else
		printf ''
	fi
}

github() {
	if echo "$ORIGIN" | grep -q '^git@github.com:'; then
		NAME="$(echo "$ORIGIN" | cut -d: -f2 | cut -d/ -f1)"
		ORIGIN="https://github.com/$NAME/$REPOSITORY"
	fi
	printf '%s/blob/%s/%s%s\n' "$ORIGIN" "$COMMIT" "$FILE" "$(damnyou_github)"
}

guess_permalink() {
	case "$ORIGIN" in
		*euandreh.xyz*)
			euandreh
			;;
		*git.sr.ht*)
			sourcehut
			;;
		*git.savannah.gnu.org*)
			savannah
			;;
		*gitlab.com*)
			gitlab
			;;
		*github.com*)
			github
			;;
		*)
			echo "Unsupported origin: $ORIGIN" >&2
			exit 1
			;;
	esac
}

LINK="$(guess_permalink)"
if [ "$PRINTONLY" = true ]; then
	echo "$LINK"
else
	echo "Opening $LINK" >&2
	xdg-open "$LINK"
fi