Adds a GitHub Issue number to a commit message based on the branch name. I.e.: branch-name-123

prepare-commit-msg

#!/bin/bash

branchPath=$(git symbolic-ref -q HEAD) #Somthing like refs/heads/myBranchName
branchName=${branchPath##*/}      #Get text behind the last / of the branch path

issueNumber=$(echo "$branchName" | grep -Po "\-\d+$" | grep -Po "\d+")
# If there was a issue number in the branch name, append it to the commit message.
if [ -n "$issueNumber" ]; then
    # Write the issue number to the commit message.
    echo "Issue: #$issueNumber" >> $1
fi