repo-generate

#!/bin/sh

progname="$(basename "$0")"
export TZ=''

release_pattern='v[0-9]*'

warn() {
	printf >&2 "%s: %s\n" "$progname" "$*"
}

die() { warn "$@"; exit 1; }

git_last_version() {
	git describe --match="$release_pattern"
}

files_changed_in_last_version() {
	git diff-tree --no-commit-id --name-only -r $(git_last_version)
}

partial_changelog() {
# the sed filter is against spammers
	git log --decorate=short --date=iso "$@" | sed '/^Author:/s/ <.*//' | sed '/^Author:/s/ [A-Za-z0-9._-]\+@.*$//'
}

gen_changelog() {
	if files_changed_in_last_version | fgrep -q sieve-connect.
	then
		partial_changelog -- sieve-connect.\*
	else
		latest="$(git_last_version)"
		partial_changelog "${latest}^..${latest}"
		echo
		partial_changelog -- sieve-connect.\*
	fi
}

missing_year() {
	local complain
	complain=die
	[ -n "${RELEASE_IGNORE_COPYRIGHT_YEAR:-}" ] && complain=warn
	$complain "Current year not in $* Copyright line"
}

check_copyright() {
	if [ $# -eq 0 ]; then
		die "Missing files to check for copyright year"
	fi
	local fn
	for fn
	do
		grep -q "Copyright.*\\<`date +%Y`" "$fn" || missing_year "$fn"
	done
}

gen_version() {
	local dirty
	dirty='--dirty=-XX'
	[ -n "${RELEASE_PRETEND_CLEAN_REPO:-}" ] && dirty=''
	git describe --match="$release_pattern" $dirty | sed -n 's/^v//p'
}

gen_date() {
	git show -s --format=%ci HEAD | cut -d ' ' -f 1
}

filter_embed_version() {
	[ $# -ne 2 ] && die "Usage: ${progname} versionfilter <infile> <outfile>"
	[ -f versionfile ] || die "missing file: versionfile"
	local repo_src="$1"
	local distributed_src="$2"

	perl -MFile::Slurp -p < "${repo_src:?}" > "${distributed_src:?}" -e '
BEGIN { $newver = read_file("versionfile"); chomp $newver; };
next unless /VERSION.*MAGIC LINE REPLACED IN DISTRIBUTION/;
$_ = qq{our \$VERSION = '"'"'$newver'"'"';\n};'
	chmod +x "${distributed_src:?}"
}

cmd="$1"
shift

case "${cmd:-unknown}" in
	copyright) check_copyright "$@" ;;
	changelog) gen_changelog "$@" ;;
	date) gen_date "$@" ;;
	version) gen_version "$@" ;;
	versionfilter) filter_embed_version "$@" ;;
	help) echo "$0 changelog|date|version|{copyright <files>}|{versionfilter <in> <out>}" ;;
	*) echo >&2 "$0: unknown action" ; exit 1 ;;
esac