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Last active April 11, 2019 10:46
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Bundler and Yarn update git hooks
Raw
README.md

Git hooks for Ruby on Rails

Tired of forgetting to run bundle after you pulled a branch?

Tired of getting Yarn's integrity error message because you forgot bin/yarn?

Just have Git run those for you after most Git operations that would change Gemfile.lock or package.json!

Install

  • Put post-checkout, post-merge (no .rb extension) and utils/ inside .git/hooks
  • chmod u+x .git/hooks/post-checkout .git/hooks/post-merge

Caveats

  • You'll need a bit more time to get your prompt back, but chances are, you would run those commands anyway, right?
  • There is no git hook that can run after a git reset operation.
Raw
post-checkout.rb
# .git/hooks/post-checkout
#!/usr/bin/env ruby
require_relative "utils/changed_files"
require_relative "utils/file_change_handler"
class PostCheckout
def initialize(old_head, new_head, changing_branches)
@old_head = old_head
@new_head = new_head
@changing_branches = changing_branches
end
def run
FileChangeHandler.new(changed_files).run
end
private
attr_reader :old_head, :new_head
def changing_branches?
@changing_branches == "1"
end
def changed_files
@_changed_files ||= ChangedFiles.new(old_head, new_head)
end
end
PostCheckout.new(*ARGV).run
Raw
post-merge.rb
# .git/hooks/post-merge
#!/usr/bin/env ruby
# Remove .rb extension (used for Git syntax highlighting) and chmod u+x
require_relative "utils/changed_files"
require_relative "utils/file_change_handler"
class PostMerge
def initialize(squash_merge)
@squash_merge = squash_merge
end
def run
FileChangeHandler.new(changed_files).run
end
private
def squash_merge?
@squash_merge == "1"
end
def changed_files
@_changed_files ||= ChangedFiles.new("ORIG_HEAD", "HEAD")
end
end
PostMerge.new(*ARGV).run
Raw
utils__changed_files.rb
#.git/hooks/utils/changed_files.rb
require "open3"
class ChangedFiles < Array
def initialize(old_head, new_head)
@old_head = old_head
@new_head = new_head
super(changed_files)
end
private
attr_reader :old_head, :new_head
def changed_files
command_output.lines.map(&:chomp)
end
def command_output
Open3.capture2(*command).tap do |output, status|
raise "There was an error" if status.exitstatus != 0
return output
end
end
def command
%w(git diff-tree -r --name-only --no-commit-id) + [old_head, new_head]
end
end
Raw
utils__file_change_handler.rb
# .git/hooks/utils/file_change_handler.rb
class FileChangeHandler
def initialize(changed_files)
@changed_files = changed_files
end
def run
run_bundle
run_yarn
end
private
attr_reader :changed_files
def run_bundle
return unless changed_files.include?("Gemfile.lock")
puts "Running Bundler after git changed Gemfile.lock..."
system("bundle")
end
def run_yarn
return unless changed_files.include?("package.json")
puts "Running Yarn after git changed packages.json..."
system("bin/yarn")
end
end
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