git-create-patch-zip

#!/bin/bash
# vi: ft=bash

# exit on error
set -e
#set -x

usage(){
    printf "USAGE: $0 <branch-base>\n"
    printf "\nWill create a set of patches starting from the commit after <branch-base> and zip it\n"
    exit 1
}

if [[ $# < 1 ]]; then
    usage
fi

LAST_COMMIT=$(git rev-parse --short HEAD)
BASE_COMMIT=$(git rev-parse --short $1 )
# in case we reference a remote branch, we need to escape directory separators
BRANCH_SAFE=$(echo "$1" | sed -e 's/\//_/g')

if [[ $LAST_COMMIT == $BASE_COMMIT ]]; then
    echo "ERROR: Base commit is the same as the last commit. Nothing to do!"
    exit 200
fi

CURRENT_BRANCH=$(git branch --show-current)
MAX_LEN=30
DATETIME_NOW="$( date +"%Y%m%d-%H%M" )"
MSG_LAST_COMMIT="$(git log -n1 --pretty=format:'%s' | cut -c1-$MAX_LEN)"
FILENAME="${DATETIME_NOW}__patches_on_top_of__${BRANCH_SAFE}_${BASE_COMMIT}__${CURRENT_BRANCH}___$(change-case --kebab \"$MSG_LAST_COMMIT\")"
OUTPUT="patches-$RANDOM"
mkdir $OUTPUT
cd $OUTPUT
git format-patch "$BASE_COMMIT"
zip -q ../$FILENAME *.patch
cd ..
rm -r $OUTPUT
printf "\nPatch archive created: %s\n" "$FILENAME"