Script that lists the commit messages that were commited in a new branch, and also displays the Phabricator revision number from each commit

commits_for_release_notes.sh

#!/bin/bash

while [[ $# > 1 ]]
do
key="$1"

case $key in
    -f|--from)
    FROM="$2"
    shift
    ;;
    -t|--to)
    TO="$2"
    shift
    ;;
    *)
    ;;
esac
shift
done

if [ -z "$FROM" ] || [ -z "$TO" ]; then
  echo "Please specify the FROM and TO branches (-f or --from, -t or --to)!"

else
  # First, do the opposite to find out the cherry picks, in order to ignore the original commits in the list,
  # and put them in an array
  CP_TEMPFILE=$(mktemp)
  CP_DIFF_NUMBERS=()
  git log --pretty=format:'%h %s' --abbrev-commit --date=relative $TO..$FROM > $CP_TEMPFILE
  
  while read CP_LINE; do
    CP_COMMIT_HASH=$(echo "$CP_LINE" | awk '{print $1}')
    CP_DIFF_NUMBER=$(git show -s --format=%B $CP_COMMIT_HASH | tail -2 | head -1 | awk -F "/" '{print $4}')
    CP_DIFF_NUMBERS=("${CP_DIFF_NUMBERS[@]}" "$CP_DIFF_NUMBER")
  done < $CP_TEMPFILE

  
  # Now finds the new commits.  
  # For each one, if the cherry pick list contains the diff revision number, then it is not displayed.
  TEMPFILE=$(mktemp)
  git log --pretty=format:'%h %s' --abbrev-commit --date=relative $FROM..$TO > $TEMPFILE

  while read LINE; do
    COMMIT_HASH=$(echo "$LINE" | awk '{print $1}')
    DIFF_NUMBER=$(git show -s --format=%B $COMMIT_HASH | tail -2 | head -1 | awk -F "/" '{print $4}')

    if [[ ! " ${CP_DIFF_NUMBERS[@]} " =~ " ${DIFF_NUMBER} " ]]; then
      echo "$LINE ($DIFF_NUMBER)"
    fi
  done < $TEMPFILE
fi