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module Subtrigger
# = Call blocks on a matching pattern
#
# This is a framework for combining pairs of matchers and callbacks to run
# on a commit message. You can define a trigger which this class will
# apply to a log message.
#
# == Example usage
#
# Trigger.define(/foo/) do |matches, repo|
# puts "Someone used 'foo' in his commit message"
# end
#
# When the above trigger is defined and somebody makes a commit message
# containing +foo+ the block will be called. +matches+ contains any
# captured regular expression groups, +repo+ is a +Repository+ object for
# the current repository revision.
#
# You can define as many triggers as you like. When no triggers are found
# an exception will be raised. When no trigger applies, it will quit
# silently.
class Trigger
class << self
@triggers = {}
# Run all available triggers on the given Repository object.
def run(repo)
raise 'No suitable triggers found.' if @triggers.nil?
@triggers.each_pair do |pattern, block|
new(pattern, repo, &block)
end
end
def triggers
@triggers ||= {}
end
def reset
@triggers = {}
end
# Create a new Trigger object and add it to the stack.
def define(pattern, &block)
(@triggers ||= {})[pattern] = block;
end
end
def initialize(pattern, repo, &block)
@pattern, @repo, @callback = pattern, repo, block
parse
end
private
# Scan the commit message and fire the callback if it matches.
def parse
@repo.message.scan(@pattern) { |match| @callback.call(match, @repo) }
end
end
end
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