Add pre-commit hook

pre-commit

@@ -0,0 +1,112 @@
+#!/bin/bash
+#
+# Author: Julian Ospald <hasufell@posteo.de>
+# Version: 0.0.1
+# Date: 2018-06-08
+# Reason: automate digest generation
+#
+# This pre-commit hook generates digests for all packages
+# that have been changed and possibly adds the Manifests to the index.
+#
+# For non-interactive mode set "DIGEST_NONINTERACTIVE=y".
+#
+
+
+die() {
+	echo "$@" 1>&2
+	exit 1
+}
+
+edo() {
+	echo "$@" 1>&2
+	"$@" || exit 1
+}
+
+
+# all staged files
+file_names=(  )
+
+# all touched packages (${CATEGORY}/${PN})
+pkgs=(  )
+
+# all packages that we generated digest for
+pkg_digs=(  )
+
+
+# set file_names
+while IFS= read -r -d '' f; do
+	file_names+=( "${f}" )
+done < <(git diff --cached --name-only -z HEAD)
+unset f IFS
+
+# exit early
+if [[ -z ${file_names[@]} ]] ; then
+	exit 0
+fi
+
+
+# name of the repository
+repo_name="$(cat $(git rev-parse --show-toplevel)/profiles/repo_name)"
+if [[ -z ${repo_name} ]] ; then
+	die "no repository name!"
+fi
+
+
+# set pkgs
+for f in "${file_names[@]}" ; do
+	ext="${f##*.}"
+	if [[ ${ext} =~ exheres-[0-9]+ ]] ; then
+		pkg=${f#packages/}
+		pkg=${pkg%/*}
+		pkgs+=( "${pkg}" )
+	fi
+done
+unset ext pkg f
+
+
+# sort array
+IFS=$'\n' pkgs=( $(sort -u <<<"${pkgs[*]}") )
+unset IFS
+
+# Allows us to read user input below, assigns stdin to keyboard
+if [[ -z ${DIGEST_NONINTERACTIVE} ]] ; then
+	exec < /dev/tty
+fi
+
+# call digest
+for pkg in "${pkgs[@]}" ; do
+	if [[ -n ${DIGEST_NONINTERACTIVE} ]] ; then
+		edo ${CAVE:-cave} digest ${pkg} ${repo_name}
+		pkg_digs+=( "${pkg}" )
+	else
+		read -p "Generate digest for ${pkg}? " -n 1 -r
+		echo
+		if [[ $REPLY =~ ^[Yy]$ ]]
+		then
+			edo ${CAVE:-cave} digest ${pkg} ${repo_name}
+			pkg_digs+=( "${pkg}" )
+		fi
+	fi
+done
+unset pkg
+
+
+# stage Manifests
+for pkg_dig in "${pkg_digs[@]}" ; do
+	if [[ -n ${DIGEST_NONINTERACTIVE} ]] ; then
+		edo git add -- packages/${pkg_dig}/Manifest
+	else
+		read -p "Add packages/${pkg_dig}/Manifest to commit? " -n 1 -r
+		echo
+		if [[ $REPLY =~ ^[Yy]$ ]]
+		then
+			edo git add -- packages/${pkg_dig}/Manifest
+		fi
+	fi
+done
+unset pkg_dig
+
+# close STDIN
+if [[ -z ${DIGEST_NONINTERACTIVE} ]] ; then
+	exec <&-
+fi