Scowl

Adds/manipulates pessimization options in your gemfile. Sorta like the pessimize gem but more configurable, but by default only adds pessimization options to un-pessimized gems. (For example if you have a gem 'foo', '~> 4.1' and you run scowl -n to lock everything to Major.minor.micro, scowl will NOT alter the pessimization for the foo gem. You can override this with options.)

Scowl is generally meant to be a developer-side tool so you probably don't need to add it to your applications Gemfile or your gem's gemspec file. You probably just want to

$ gem install scowl

And then execute:

$ scowl -h

To see all the wonderful options.

$ scowl [options] [<gem> [<gem> [...]]]

Options:

• -h, --help - Show help message
• -p, --pretend - Run scowl and emit its changes as a list of recommendations, but don't actually change things -s, --show - Write output to console instead of updating Gemfile
• -m, --major - Pessimize to major version, e.g. '~> 4.1', which locks major version but allows minor version to change
• -n, --minor - Pessimize to minor version, e.g. '~> 4.1.3', which locks minor version but allows micro version to change
• -G, --no-gemspec - Do not edit gemspec file even if Gemfile contains a 'gemspec' directive
• -t, --tighten - Change existing pessimizations, but only if they would be tightened (only makes sense with --minor)
• -o, --override - Set all pessimizations, even if they are already set and would be loosened
• -x, --exclude - Exclude gem(s) if they would be changed (May be passed multiple times or pass comma-separated list, e.g. --exclude=foo,bar,baz.)
• -0, --nonsemantic-zero - Tighten versions one level tighter if gem version begins with a zero (See note about Nonsemantic Zero below)
• -q, --quiet - Do not raise warnings
• -a, --add-missing - Add unlisted dependencies (STRONGLY recommend you run this is --pretend or --show mode first)

Notes:

• If gem names are specified, ONLY those gems will be checked/modified
• Exclude trumps everything, including naming a gem specifically. E.g. gem -x foo,bar foo bar will do nothing
• Exclude can be used with -a to keep specific gems from being added, E.g. `gem
• --add-missing combined with gem names will ONLY add the named gems. It will NOT add hidden dependencies for the named gems

Many gems do not adhere to semantic versioning while they are still in version zero, even if they are very old and fairly stable. An ad-hoc standard has emerged to allow breaking changes in 0.minor version changes and lump new features and bug fixes together in micro version changes. If you use --nonsemantic-zero with --major, scowl will pessimize gems still in version 0 to --minor automatically.

• Initial spike
  • Read the Gemfile and get list of gem specifications
  • Run bundle exec gem list to get list of installed gems
  • Detect existing pessimizations and version locks (e.g. = 4.3.1 and > 4.5)
  • Emit Gemfile with new pessimizations added
• Support tighten
  • Detect existing pessimization level
  • Know if specified level is tighter than existing level, e.g. --minor is tighter than ~> 4.1, --major is tighter than ~> 4
• Can/should we parse into gemspec? For now, assume no. For later... ehhh, seems very similarly parseable?
• Don't mess up other options, e.g. source and require options
• Implement nonsemantic zero support
• Support named list of gems
• Support excluded gems
• Weird test/edge cases
  • Handle useless pessimization? E.g. Treat ~> 4, which is essentially identical to >= 4, as tightening (don't set to major or minor unless --tighten specified)

• If a gem is specified with no version but is not installed, should we gem search for it? No -- we're not gonna use gem list but rather bundle show <gem>; you should probably get bundle install working and specs passing before running scowl

After checking out the repo, run bin/setup to install dependencies. Then, run rake false 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 tags, and push the .gem file to rubygems.org.

Please help! Pull requests from new contributors very welcome! Please contact @dbrady if you want to make a large change, otherwise please just make sure your pull request says what your change fixes/adds and your specs demonstrate the fix or document the feature.

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/scowl. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.