Prepend JIRA issue name to commits

README.txt

To set up:
Create the directory ~/.git-templates/hooks and save the above content in a file named prepare-commit-msg in that directory
Run chmod a+x ~/.git-templates/hooks/prepare-commit-msg
Run git config --global init.templatedir '~/.git-templates'
In any repos you already have on your machine, run git init to apply the changes. Newly cloned repos won't need this step.
Once this has been set up, running a command like git commit -m "This is a test message" on a branch such as ABC-123 will produce a final commit message of [ABC-123] This is a test message automatically.

prepare-commit-msg.sh

#!/bin/bash

# Include any branches for which you wish to disable this script
if [ -z "$BRANCHES_TO_SKIP" ]; then
  BRANCHES_TO_SKIP=(master develop staging test)
fi

# Get the current branch name and check if it is excluded
BRANCH_NAME=$(git symbolic-ref --short HEAD)
BRANCH_EXCLUDED=$(printf "%s\n" "${BRANCHES_TO_SKIP[@]}" | grep -c "^$BRANCH_NAME$")

# Trim it down to get the parts we're interested in
TRIMMED=$(echo $BRANCH_NAME | sed -e 's:^\([^-]*-[^-]*\)-.*:\1:' -e \
    'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/')

# If it isn't excluded, preprend the trimmed branch identifier to the given message
if [ -n "$BRANCH_NAME" ] &&  ! [[ $BRANCH_EXCLUDED -eq 1 ]]; then
  sed -i.bak -e "1s/^/[$TRIMMED] /" $1
fi