Prepare commit message using conventional commits

prepare-commit-msg

#!/bin/bash

# Format commits using JIRA issue ID and conventional commits.
# E.g.
#   Branch name: fix/ABC-123/bug-fixing
#   Commit message: Bug fixed
#   Formatted commit message: fix: [ABC-123] Bug fixed

REGEX_ISSUE_ID="[a-zA-Z0-9,\.\_\-]+-[0-9]+"
REGEX_ISSUE_TYPE="[a-z]+"
BRANCH_NAME=$(git rev-parse --abbrev-ref HEAD)

if [ "$BRANCH_NAME" != 'HEAD' ]; then

    ISSUE_TYPE=$(echo "$BRANCH_NAME" | grep -o -E "$REGEX_ISSUE_TYPE" | head -1)
    ISSUE_ID=$(echo "$BRANCH_NAME" | grep -o -E "$REGEX_ISSUE_ID")

    if [[ -z "$ISSUE_ID" ]]; then
        echo "$ISSUE_TYPE: $(cat $1)" >"$1"
    else
        echo "$ISSUE_TYPE: [$ISSUE_ID] $(cat $1)" >"$1"
    fi

    echo " " >>"$1"
    echo "$TAG" >>"$1"

fi