1 files changed, 101 insertions, 0 deletions
diff --git a/libgithook.sh b/libgithook.sh
new file mode 100755
index 0000000..30ca43f
--- /dev/null
+++ b/libgithook.sh
@@ -0,0 +1,101 @@
+#!/usr/bin/env bash
+# Library for easier Git hook scripting
+# Copyright (C) 2019  Aaron Ball <nullspoon@oper.io>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+set -eou pipefail
+
+export OLDREV NEWREV REFNAME
+declare -a TAGS
+declare -a REFS
+declare -a FILES_A
+declare -a FILES_M
+declare -a FILES_D
+declare -a FILES_R
+
+export IFS=$' \n\t'
+read OLDREV NEWREV REFNAME
+export IFS=$'\n'
+[ ${OLDREV} = '0000000000000000000000000000000000000000' ] && OLDREV=${NEWREV}
+[ ${NEWREV} = '0000000000000000000000000000000000000000' ] && NEWREV=${OLDREV}
+
+
+# load_tags:
+# Loads any tags into the TAGS array that were created within the changed refs.
+load_tags() {
+  if [ "${REFNAME:0:10}" = 'refs/tags/' ]; then
+    if [ -f "${REFNAME}" ]; then
+      printf '[tag] created %s\n' "$(basename ${REFNAME})"
+      TAGS+=("$(basename ${REFNAME})")
+    elif [ ! -f "${REFNAME}" ]; then
+      printf '[tag] deleted %s\n' "$(basename ${REFNAME})"
+    else
+      printf '[tag] Something went wrong with "%s"\n' "${REFNAME}"
+    fi
+  fi
+}
+
+
+# load_refs:
+# Loads the list of new refs into the REFS array
+load_refs() {
+  REFS=($(git rev-list "^${OLDREV}" "${NEWREV}"))
+}
+
+
+# load_file_actions:
+# Reads the changed refs list and loads file paths into their respective files
+# arrays (eg: FILES_A (added), FILES_D (deleted), FILES_M (modified), and
+# FILES_R (renamed)).
+load_file_actions() {
+  local changes=($(git diff --name-status "^${OLDREV}" "${NEWREV}"))
+  for change in ${changes[@]}; do
+    if [ "${change:0:1}" = 'A' ]; then
+      # File is added
+      FILES_A+=(${change#*	})
+    elif [ "${change:0:1}" = 'M' ]; then
+      # File is modified
+      FILES_M+=(${change#*	})
+    elif [ "${change:0:1}" = 'D' ]; then
+      # File is deleted
+      FILES_D+=(${change#*	})
+    elif [ "${change:0:4}" = 'R100' ]; then
+      # File is moved/renamed
+      FILES_R+=(${change#*	})
+    fi
+  done
+}
+
+
+# dump_sess:
+# Dumps all gathered info about the git operation to stdout so clients can see
+# the changes that were detected. This includes dumping the files arrays, tags
+# arrays and the ref information.
+dump_sess() {
+  printf '\n'
+  printf 'OLD:  %s\n' "${OLDREV}"
+  printf 'NEW:  %s\n' "${NEWREV}"
+  printf 'NAME: %s\n\n' "${REFNAME}"
+  printf 'Files added:\n'
+  printf '  %s\n' "${FILES_A[@]}"
+  printf 'Files modified:\n'
+  printf '  %s\n' "${FILES_M[@]}"
+  printf 'Files deleted:\n'
+  printf '  %s\n' "${FILES_D[@]}"
+  printf 'Files renamed:\n'
+  printf '  %s\n' "${FILES_R[@]}"
+  printf 'Tags created:\n'
+  printf '  %s\n' "${TAGS[@]}"
+  printf '\n'
+}