Git prepare-commit-msg hook adding JIRA issue key before git commit message based on your branch name e.g. feature/KEY-1234

prepare-commit-msg

#!/bin/sh

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# Setup                                                                       #
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# Use global hooks directory for each existing and new repository:
# $ git config --global core.hooksPath '~/.git-hooks'
# $ mkdir ~/.git-hooks
# $ chmod a+x ~/.git-hooks/prepare-commit-msg

# Or automatically copy your hooks to each new repository:
# $ git config --global init.templatedir '~/.git-templates'
# $ mkdir -p ~/.git-templates/hooks
# $ chmod a+x ~/.git-templates/hooks/prepare-commit-msg

# How to remove global git configuration:
# $ git config --global --list
# $ git config --global --unset core.hooksPath
# $ git config --global --unset init.templatedir

###############################################################################
# Hook                                                                        #
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BRANCH_NAME="$(git symbolic-ref --short HEAD)"
ISSUE_KEY="$(echo $BRANCH_NAME | grep -oEe '[A-Z0-9]+-[0-9]+')"
COMMIT_MESSAGE="$(cat $1)"
COMMIT_SOURCE=$2

# echo $BRANCH_NAME
# echo $ISSUE_KEY
# echo "$COMMIT_MESSAGE"
# echo $COMMIT_SOURCE

if [[ -n $ISSUE_KEY && $COMMIT_SOURCE == 'message' ]]
then
    echo "[$ISSUE_KEY] $COMMIT_MESSAGE" > $1
fi