bashForCopyingBranchName.txt

Step 1. 

Rename C:\code\ifrs17\.git\hooks\prepare-commit-msg.sample
and remove .sample

Step 2.
copy/paste the following bash script into prepare-commit-msg

#!/bin/bash

BRANCH_NAME=$(git symbolic-ref --short HEAD)
BRANCH_NAME="${BRANCH_NAME##*/}"

USER_STORY_ID_LOWERCASE_REGEXP='^(us)[0-9]{6,7}'
COMMIT_MESSAGE=$(cat $1)

if [ -n "$BRANCH_NAME" ] && ! [[ "${COMMIT_MESSAGE}" =~ ${USER_STORY_ID_LOWERCASE_REGEXP} ]]; then
  [[ "${BRANCH_NAME}" =~ ${USER_STORY_ID_LOWERCASE_REGEXP} ]]
  sed -i.bak -e "1s/^/${BASH_REMATCH[0]}: /" $1
fi


Step 2. Test your hook.
If the hook is active, when you do $git commit -m "My awesome commit" 
then it appears on git log as US12345 My awesome commit
Note: Your branch should be named properly such as feature/edi/US12345_awesomeness