Extract Issue Tags from Commit History in a Branch Based Off develop

list-issues.sh

#!/usr/bin/env bash

##
# @file
# Extracts all of the issue tags in commit messages of a branch_ref and lists them.
#
# Usage:
# list-issues.sh [branch_ref ref] [base branch_ref ref]
#
# - If [branch_ref ref] is not specified, it defaults to "HEAD" (whatever is
#   currently checked out.
# - If [base branch_ref ref] is not specified, it defaults to "main"
#   (the develop branch_ref).
#
# If the Git history looked like this:
#   [ABC-123] Some change
#   [ABC-456] Another change
#   [ABC-123] [ABC-786] Still other changes
#
# Then the output would be a sorted list of tickets, like this:
#   ABC-123
#   ABC-456
#   ABC-786
#

set -eu

################################################################################
# Constants
################################################################################
project="ABC"
default_branch_ref="HEAD"
default_base_branch_ref="main"

################################################################################
# Command-line Arguments with Defaults
################################################################################
branch_ref="${1:-${default_branch_ref}}"
base_branch_ref="${2:-${default_base_branch_ref}}"

################################################################################
# Main Script
################################################################################
git log --format=oneline "${base_branch_ref}...${branch_ref}" | \
  sed -E 's/\[|\]/\n/g' | grep -E "^${project}-" | sort --numeric-sort | uniq