Pre-commit hook to prefix the jira issue number to commit message using bash

prepare-commit-msg

#!/bin/sh

# Get current branch name
branch_name="$(git rev-parse --symbolic-full-name --abbrev-ref HEAD)"
# Replace or add the board name abbreviations here
jira_abbreviations=("JIRA_BOARD_ABBREVIATION") 

# Check if current branch is a feature branch i.e. starts with a ticket number
check_is_issue_branch () {
    for abbrv in "${jira_abbreviations[@]}"
    do
        if grep -i "^$abbrv" <<< "$branch_name"; then
            return 0
        fi
    done
    return 1
}

# Check if user already prefixed the issue number to the code
check_is_commit_prefixed () {
    commit_msg="$1"
    for abbrv in "${jira_abbreviations[@]}"
    do
        if grep -i "^$abbrv" <<< "$commit_msg"; then
            return 0
        fi
    done
    return 1
}

# Attach the prefix to commit message
attach_prefix () {
    file_path="$1"
    commit_msg="$(<$file_path)"
    check_is_commit_prefixed "$commit_msg"
    if [ "$?" = 1 ];  then
        delimiter="-"
        combined_branch_name=$branch_name$delimiter
        split_branch_name=();
        while [[ $combined_branch_name ]]; do
            split_branch_name+=( "${combined_branch_name%%"$delimiter"*}" );
            combined_branch_name=${combined_branch_name#*"$delimiter"};
        done;
        commit_prefix="${split_branch_name[0]}-${split_branch_name[1]}"
        commit_msg="${commit_prefix} ${commit_msg}"
        echo "$commit_msg" | tee "$file_path"
    fi
}

# Path to commit message
file_path=$1

# Getting the current commit message
commit_msg="$(<$file_path)"

check_is_issue_branch
if [ "$?" = 0 ]; then
    attach_prefix "$file_path"
fi

exit 0