Git hook that checks if an issue was linked to the commit. If not, adds default issue reference and marks the commit as draft. To use - save as .git\hooks\commit-msg and make it executable

commit-msg

#!/usr/bin/bash

# Git hook that checks if an issue was linked to the commit.
# If not, adds default issue reference and marks the commit as draft.

ISSUE_KEYWORD='JIRA'
DEFAULT_ISSUE='NA'
DRAFT_KEYWORD='DRAFT'

# File containing the commit message is passed as first argument
COMMIT_MESSGAE_FILE="$1"
COMMIT_TITLE=$(cat "$COMMIT_MESSGAE_FILE" | head --lines 1)

LINKED_ISSUE=$(git interpret-trailers --parse --trim-empty "$COMMIT_MESSGAE_FILE" | grep "$ISSUE_KEYWORD")

# If there is no issue referenced
if [ -z "$LINKED_ISSUE" ]; then
    # Add default issue reference
    git interpret-trailers --in-place --if-exists replace --trailer "$ISSUE_KEYWORD: $DEFAULT_ISSUE"  "$COMMIT_MESSGAE_FILE"

    # Insert the draft keyword if it is not added already
    if [[ ! "$COMMIT_TITLE" =~ ^\[$DRAFT_KEYWORD\] ]]; then
        sed --in-place "1 s/^/[$DRAFT_KEYWORD] /" "$COMMIT_MESSGAE_FILE"
    fi    
fi