Script Git hook which prefix BRANCH name in every COMMIT if this one is like MAG-1234 or SUP-1234. Add also the branch description if define a the end of the commit.

prepare-commit-msg

#!/bin/sh

BRANCH_NAME=$(git symbolic-ref --short HEAD)
# Set description with : git branch --edit-description $(git symbolic-ref --short HEAD)
BRANCH_DESCRIPTION=$(git config branch."$BRANCH_NAME".description)
STORY_NUMBER=$(echo $BRANCH_NAME | sed -n 's/\(\(MAG\|SUP\)-[0-9]*\).*/\1/p')

if [ -n "$STORY_NUMBER" ]; then
    sed -i.back "1s/^/$STORY_NUMBER :  \n/" "$1" 

    # Add the branch description if there is one
    if [ -n "$BRANCH_DESCRIPTION" ]; then
       echo $BRANCH_DESCRIPTION >> "$1"
    fi
fi