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java_checkstyle.rb

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# frozen_string_literal: true

module Overcommit::Hook::PreCommit

# Runs `checkstyle` against any modified Java files.

#

# @see http://checkstyle.sourceforge.net/

class JavaCheckstyle < Base

MESSAGE_REGEX = /^(\[(?<type>[^\]]+)\]\s+)?(?<file>(?:\w:)?[^:]+):(?<line>\d+)/.freeze

MESSAGE_TYPE_CATEGORIZER = lambda do |type|

%w[WARN INFO].include?(type.to_s) ? :warning : :error

end

def run

result = execute(command, args: applicable_files)

output = result.stdout.chomp

# example message:

# path/to/file.java:3:5: Error message

extract_messages(

output.split("\n").grep(MESSAGE_REGEX),

MESSAGE_REGEX,

MESSAGE_TYPE_CATEGORIZER

)

end

end

end