Initial import

.gitignore

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+/.bundle/
+/.yardoc
+/_yardoc/
+/coverage/
+/doc/
+/pkg/
+/spec/reports/
+/tmp/

.rubocop.yml

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+AllCops:
+  TargetRubyVersion: 3.1
+
+Style/StringLiterals:
+  EnforcedStyle: double_quotes
+
+Style/StringLiteralsInInterpolation:
+  EnforcedStyle: double_quotes

CHANGELOG.md

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+## [Unreleased]
+
+## [0.1.0] - 2025-01-19
+
+- Initial release

Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+# Specify your gem's dependencies in picop.gemspec
+gemspec
+
+gem "rake", "~> 13.0"
+
+gem "minitest", "~> 5.16"
+
+gem "rubocop", "~> 1.21"

Gemfile.lock

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+PATH
+  remote: .
+  specs:
+    picop (0.1.0)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ast (2.4.2)
+    json (2.9.1)
+    language_server-protocol (3.17.0.3)
+    minitest (5.25.4)
+    parallel (1.26.3)
+    parser (3.3.6.0)
+      ast (~> 2.4.1)
+      racc
+    racc (1.8.1)
+    rainbow (3.1.1)
+    rake (13.2.1)
+    regexp_parser (2.10.0)
+    rubocop (1.70.0)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 2.9.3, < 3.0)
+      rubocop-ast (>= 1.36.2, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 4.0)
+    rubocop-ast (1.37.0)
+      parser (>= 3.3.1.0)
+    ruby-progressbar (1.13.0)
+    unicode-display_width (3.1.4)
+      unicode-emoji (~> 4.0, >= 4.0.4)
+    unicode-emoji (4.0.4)
+
+PLATFORMS
+  arm64-darwin-24
+  ruby
+
+DEPENDENCIES
+  minitest (~> 5.16)
+  picop!
+  rake (~> 13.0)
+  rubocop (~> 1.21)
+
+BUNDLED WITH
+   2.6.2

LICENSE.txt

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+The MIT License (MIT)
+
+Copyright (c) 2025 Dan Milne
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# Picop
+
+TODO: Delete this and the text below, and describe your gem
+
+Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file `lib/picop`. To experiment with that code, run `bin/console` for an interactive prompt.
+
+## Installation
+
+TODO: Replace `UPDATE_WITH_YOUR_GEM_NAME_IMMEDIATELY_AFTER_RELEASE_TO_RUBYGEMS_ORG` with your gem name right after releasing it to RubyGems.org. Please do not do it earlier due to security reasons. Alternatively, replace this section with instructions to install your gem from git if you don't plan to release to RubyGems.org.
+
+Install the gem and add to the application's Gemfile by executing:
+
+```bash
+bundle add UPDATE_WITH_YOUR_GEM_NAME_IMMEDIATELY_AFTER_RELEASE_TO_RUBYGEMS_ORG
+```
+
+If bundler is not being used to manage dependencies, install the gem by executing:
+
+```bash
+gem install UPDATE_WITH_YOUR_GEM_NAME_IMMEDIATELY_AFTER_RELEASE_TO_RUBYGEMS_ORG
+```
+
+## Usage
+
+TODO: Write usage instructions here
+
+## Development
+
+After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake test` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
+
+To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and the created tag, and push the `.gem` file to [rubygems.org](https://rubygems.org).
+
+## Contributing
+
+Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/picop.
+
+## License
+
+The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).

Rakefile

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+# frozen_string_literal: true
+
+require "bundler/gem_tasks"
+require "minitest/test_task"
+
+Minitest::TestTask.create
+
+require "rubocop/rake_task"
+
+RuboCop::RakeTask.new
+
+task default: %i[test rubocop]

bin/console

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+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "bundler/setup"
+require "picop"
+
+# You can add fixtures and/or initialization code here to make experimenting
+# with your gem easier. You can also use a different console, if you like.
+
+require "irb"
+IRB.start(__FILE__)

bin/setup

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+#!/usr/bin/env bash
+set -euo pipefail
+IFS=$'\n\t'
+set -vx
+
+bundle install
+
+# Do any other automated setup that you need to do here

exe/picop

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+#!/usr/bin/env ruby
+
+# Add lib directory to load path
+lib_path = File.expand_path('../lib', __dir__)
+$LOAD_PATH.unshift(lib_path) unless $LOAD_PATH.include?(lib_path)
+
+require 'picop'
+
+begin
+  Geckin::CLI.run(ARGV)
+rescue => e
+  warn "Error: #{e.message}"
+  warn e.backtrace if ENV['DEBUG']
+  exit 1
+end

lib/picop.rb

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+# frozen_string_literal: true
+
+require_relative "picop/version"
+require_relative "picop/source_file"
+require_relative "picop/scanner"
+require_relative "picop/cli"
+
+module Picop
+  class Error < StandardError; end
+  # Your code goes here...
+end

lib/picop/cli.rb

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+require "optparse"
+
+module Picop
+  class CLI
+    def self.run(argv = ARGV)
+      command = argv.shift
+      case command
+      when 'scan'
+        options = {}
+        OptionParser.new do |opts|
+          opts.banner = "Usage: picop scan [options] DIRECTORY"
+          opts.on('-v', '--verbose', 'Run verbosely') { |v| options[:verbose] = v }
+        end.parse!(argv)
+
+        dir = argv.first || '.'
+        Picop::Scanner.scan(dir, options)
+
+      when 'sign'
+        OptionParser.new do |opts|
+          opts.banner = "Usage: picop sign FILE"
+        end.parse!(argv)
+
+        file = argv.first
+        Picop::SourceFile.new(file).sign
+
+      when 'checksum'
+        OptionParser.new do |opts|
+          opts.banner = "Usage: picop checksum FILE"
+        end.parse!(argv)
+        file = argv.first
+        puts Picop::SourceFile.new(file).checksum
+
+      when 'verify'
+        OptionParser.new do |opts|
+          opts.banner = "Usage: picop sign FILE"
+        end.parse!(argv)
+
+        path = argv.first
+        source = SourceFile.new(path)
+
+        if source.metadata['content_checksum'].nil?
+          puts "⚠️  No checksum found in #{path}"
+          puts "Run 'picop sign #{path}' to add one"
+          exit 1
+        end
+
+        unless source.verify
+          puts "❌ Checksum verification failed for #{path}"
+          puts "Expected: #{source.metadata['content_checksum']}"
+          puts "Got:      #{source.checksum}"
+          exit 1
+        end
+  
+        puts "✅ #{path} verified successfully"
+
+      when 'show'
+        OptionParser.new do |opts|
+          opts.banner = "Usage: picop show FILE|DIRECTORY"
+        end.parse!(argv)
+
+        path = argv.first
+        Picop.show(path)
+
+      when 'update'
+        options = {}
+        OptionParser.new do |opts|
+          opts.banner = "Usage: picop update [options] FILE"
+          opts.on('-f', '--force', 'Force update') { |f| options[:force] = f }
+        end.parse!(argv)
+
+        file = argv.first
+        Picop.update(file, options)
+
+      else
+        puts "Unknown command: #{command}"
+        puts "Available commands: scan, sign, show, update"
+        exit 1
+      end
+    rescue OptionParser::InvalidOption => e
+      puts e.message
+      exit 1
+    rescue => e
+      puts "Error: #{e.message}"
+      puts e.backtrace if ENV['DEBUG']
+      exit 1
+    end
+  end
+end

lib/picop/scanner.rb

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+module Picop
+  module Scanner
+    def self.scan(directory, pattern: "**/*")
+      Dir.glob(File.join(directory, pattern)).select do |file|
+        next unless File.file?(file)
+        content = File.read(file)
+        content.match?(SourceFile::METADATA_PATTERN)
+      end.map { |file| SourceFile.new(file) }
+    end
+  end
+end

lib/picop/source_file.rb

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+require "yaml"
+require "digest"
+
+module Picop
+  class SourceFile
+    attr_reader :file_path, :content
+
+    METADATA_PATTERN = /^\s*#\s*@META_START\n(.*?)^\s*#\s*@META_END/m
+
+    def initialize(file_path)
+      @file_path = file_path
+      @content = File.read(file_path)
+    end
+
+    def metadata
+      @metadata ||= begin
+        return {} unless content =~ METADATA_PATTERN
+    
+        yaml_content = $1.lines.map do |line|
+          line.sub(/^\s*#\s?/, '').rstrip
+        end.join("\n")
+    
+        YAML.safe_load(yaml_content)
+      end
+    end
+
+    def file_content = content.sub(/^\s*#\s*@META_START\n.*?^\s*#\s*@META_END\n*/m, '')
+
+    def checksum = "sha256:#{Digest::SHA256.hexdigest(file_content)}"
+
+    def show = puts(metadata.merge({checksum: checksum}))
+
+    def save = File.write(file_path, content)
+
+    def add_metadata(metadata_hash)
+      yaml_content = metadata_hash.to_yaml.strip
+      metadata_block = [
+        "# @META_START",
+        yaml_content.lines.map { |line| "# #{line}" }.join,
+        "# @META_END"
+      ].join("\n")
+
+      if content =~ METADATA_PATTERN
+        @content = content.sub(METADATA_PATTERN, metadata_block)
+      else
+        @content = [metadata_block, content].join("\n\n")
+      end
+    end
+    
+    def sign
+      hash = checksum
+      meta = metadata || {}
+      return puts "File already signed" if meta['content_checksum'] == hash
+    
+      meta['content_checksum'] = "#{hash}"
+      add_metadata(meta)
+      save
+    end
+
+    def verify
+      return false unless metadata.key? 'content_checksum'
+      checksum == metadata['content_checksum']
+    end
+  end
+end

lib/picop/version.rb

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+# frozen_string_literal: true
+
+module Picop
+  VERSION = "0.1.0"
+end

picop.gemspec

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+# frozen_string_literal: true
+
+require_relative "lib/picop/version"
+
+Gem::Specification.new do |spec|
+  spec.name = "picop"
+  spec.version = Picop::VERSION
+  spec.authors = ["Dan Milne"]
+  spec.email = ["d@nmilne.com"]
+
+  spec.summary = "TODO: Write a short summary, because RubyGems requires one."
+  spec.description = "TODO: Write a longer description or delete this line."
+  spec.homepage = "TODO: Put your gem's website or public repo URL here."
+  spec.license = "MIT"
+  spec.required_ruby_version = ">= 3.1.0"
+
+  spec.metadata["allowed_push_host"] = "TODO: Set to your gem server 'https://example.com'"
+
+  spec.metadata["homepage_uri"] = spec.homepage
+  spec.metadata["source_code_uri"] = "TODO: Put your gem's public repo URL here."
+  spec.metadata["changelog_uri"] = "TODO: Put your gem's CHANGELOG.md URL here."
+
+  # Specify which files should be added to the gem when it is released.
+  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
+  gemspec = File.basename(__FILE__)
+  spec.files = IO.popen(%w[git ls-files -z], chdir: __dir__, err: IO::NULL) do |ls|
+    ls.readlines("\x0", chomp: true).reject do |f|
+      (f == gemspec) ||
+        f.start_with?(*%w[bin/ test/ spec/ features/ .git appveyor Gemfile])
+    end
+  end
+  spec.bindir = "exe"
+  spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
+  spec.require_paths = ["lib"]
+
+  spec.add_dependency "open-uri", "~> 0.5"
+  spec.add_dependency "yaml", "~> 0.4"
+  spec.add_dependency "digest"
+  spec.add_development_dependency "debug"
+  
+  # For more information and examples about making a new gem, check out our
+  # guide at: https://bundler.io/guides/creating_gem.html
+end

test/files/broken_front_matter_1.rb

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+# @META_START
+# home_url: https://github.com/user/repo/blob/main/path/to/file.rb
+# source_url: https://github.com/user/repo/raw/#{version}/path/to/file.rb
+# version: 1.0.0
+# alsdfkasf
+# content_hash: sha256:d747c448ce60a6ef1a8372f7c7eee10160075acbed6412a12c2f6d71ca8b2f76
+# @META_END
+require "cgi"
+puts "hi"

test/test_helper.rb

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+# frozen_string_literal: true
+
+$LOAD_PATH.unshift File.expand_path("../lib", __dir__)
+require "picop"
+
+require "minitest/autorun"

test/test_picop.rb

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+# frozen_string_literal: true
+
+require "test_helper"
+
+class TestPicop < Minitest::Test
+  def test_that_it_has_a_version_number
+    refute_nil ::Picop::VERSION
+  end
+
+  def test_it_does_something_useful
+    assert false
+  end
+end