Overcommit 0.24.0

This marks a major milestone for Overcommit. A host of new types of hooks are now possible and of course new hooks to go with them. A special thanks to @jawshooah for the tremendous amount of work he has put into this release.

A major change from the previous version is that almost all hooks are now opt-in by default. Since Overcommit is starting to get used on a wide variety of projects, having to manually disable all the hooks you don't want to run for every new project was becoming a nuisance, and so it made sense to switch to having to opt-in to (almost) all hooks. This should make the tool more generally useful and easier to get started with.

However, this means developers who are upgrading will have to manually copy the default configuration from 0.23.0 (or whichever version they were running previously) in order to have Overcommit behave the same way as it was previously. It may be worthwhile to manually go through all the hooks yourself rather than copying over, however.

Another major change is the order in which ALL hook configurations are applied. Previously, a hook's configuration was determined by applying the default and repo-specific configuration in the following order:

config/default.yml[ALL] → .overcommit.yml[ALL] → config/default.yml[hook] → .overcommit.yml[hook]

This was a bit unintuitive, as a hook-specific config in the default configuration could override the repo-specific ALL hook configuration. This has been changed so configuration is applied in the following order:

config/default.yml[ALL] → config/default.yml[hook] → .overcommit.yml[ALL] → .overcommit.yml[hook]

See #117 for the full discussion.

New Features

• Add required_library/required_libraries hook option which specifies
  a list of paths a hook should load with Kernel.require before running
• Add JsLint pre-commit hook that checks the style of JavaScript files with
  JSLint
• Add RubyLint pre-commit hook that statically analyzes Ruby files with
  ruby-lint
• Add Jsl pre-commit hook that checks the style of JavaScript files with
  JavaScript Lint
• Add CapitalizedSubject commit message hook
• Add GoVet pre-commit hook that examines Go source files with
  vet
• Add XmlSyntax pre-commit hook to check that XML files are valid
• Add CaseConflicts pre-commit hook which checks for file names in the same
  directory which differ by letter casing
• Preserve existing git hooks in a repository when installing Overcommit hooks,
  and restore them on uninstall
• Add RSpec pre-push hook that runs RSpec tests before
  pushing to remote
• Add ProtectedBranches pre-push hook that prevents destructive pushes
  (deletions or force pushes) to specified branches
• Add SpellCheck commit-msg hook to check commit messages for misspelled words
• Add support for pre-rebase hooks
• Add SubmoduleStatus post-checkout, post-commit, post-merge, and
  post-rewrite hooks that warn when submodules are uninitialized, out of date
  with the current index, or contain merge conflicts

Changes

• Disable ShellCheck pre-commit hook by default
• Switch ImageOptim hook to use executable instead of Ruby API
• Improve CoffeeLint pre-commit hook to differentiate between errors and
  warnings
• Improve GoLint pre-commit hook to extract file and line information
• Change configuration loading behavior to prefer user-defined ALL hook
  configuration over default ALL configuration, and user-defined hook
  configuration over default ALL configuration
• Change hook summary message to mention warnings if there were any
• Disable almost all hooks by default. You will now need to explicitly enable
  almost all hooks yourself in your .overcommit.yml. If you are migrating from
  overcommit 0.23.0 and want to use the default configuration that shipped
  with that version, copy the default configuration from 0.23.0
• Update ScssLint pre-commit hook to properly handle special exit code that
  signals all files were filtered by exclusions (new as of scss-lint 0.36.0)
• Update childprocess dependency to minimum 0.5.6
• Change default value for problem_on_unmodified_line from warn to report
• Update Rubocop pre-commit hook to pass --display-cop-names flag so
  cop names appear in output
• Drop support for returning :good/:bad results from hooks (was deprecated in
  0.15.0)
• Remove PryBinding pre-commit hook since its functionality is provided by the
  Rubocop pre-commit hook

Bug Fixes

• Fix LocalPathsInGemfile to not report lints for commented paths
• Fix CssLint pre-commit hook to ignore blank lines in csslint output
• Fix error instructions typo in BundleCheck pre-commit hook
• Fix bug where stashed changes were not restored when plugin signature
  validation failed
• Don't clear working tree after pre-commit hook when only submodule changes
  are present
• Restore file modification times of unstaged files in addition to staged files
  in pre-commit hook runs