Checks if a git commit or PR no exists between two tags (i.e. in a release)

git_between.rb

#!/usr/bin/env ruby
# frozen_string_literal: true

# Check if a commit hash or PR no (e.g. #1234) exists between two git tags.
#
# Usage:
#   ruby git-between.rb <tag1> <tag2> <commit_or_PR>
#
# Examples:
#   ruby git-between.rb 2026.03.16-1 2026.03.16-1 8e9dbe631
#   ruby git-between.rb 2026.03.16-1 2026.03.16-1 "#7351"

if ARGV.length != 3
  warn "Usage: #{$PROGRAM_NAME} <tag1> <tag2> <commit_or_string>"
  warn ""
  warn "Examples:"
  warn "  #{$PROGRAM_NAME} v1.0.0 v1.1.0 abc123f"
  warn "  #{$PROGRAM_NAME} v1.0.0 v1.1.0 '#1234'"
  exit 1
end

tag1, tag2, search_term = ARGV

# Verify both tags exist
[tag1, tag2].each do |tag|
  unless system("git rev-parse #{tag} >/dev/null 2>&1")
    warn "Error: tag '#{tag}' not found"
    exit 1
  end
end

# Get the log between the two tags (tag1 exclusive, tag2 inclusive)
log = `git log --oneline --decorate #{tag1}..#{tag2}`.strip

if log.empty?
  puts "No commits found between #{tag1} and #{tag2}"
  exit 1
end

matches = log.lines.select { |line| line.include?(search_term) }

if matches.any?
  puts "Found '#{search_term}' between #{tag1} and #{tag2}:"
  puts ""
  matches.each { |line| puts "  #{line}" }
else
  puts "'#{search_term}' was NOT found between #{tag1} and #{tag2}"
  exit 1
end