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ashish-d/pre-commit

Created February 24, 2017 18:54
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Pre commit hook that runs rubocop on staged files.
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pre-commit
#!/usr/bin/env ruby
require 'rubocop'
require 'english'
ADDED_OR_MODIFIED = /A|AM|^M/
# to prevent code injection: system is a dangerous call
def raise_single_quote_error
raise ArgumentError, 'Single quotes are not allowed in filenames here.'
end
def extract_file_name(file_name_with_status)
file_name_array = file_name_with_status.strip.split(' ')
file_name_array.shift
fname = file_name_array.join(' ')
fname[0] = '' if fname[0] == '"'
fname[fname.length - 1] = '' if fname[fname.length - 1] == '"'
raise_single_quote_error if fname.include?("'")
fname
end
changed_files =
`git status --porcelain`
.split(/\n/)
.select { |file_name_with_status| file_name_with_status =~ ADDED_OR_MODIFIED }
.map { |file_name_with_status| extract_file_name file_name_with_status }
.select { |file_name| File.extname(file_name) =~ /.rb/ }
.join("' '")
system("rubocop '#{changed_files}'") unless changed_files.empty?
exit $CHILD_STATUS.to_s[-1].to_i
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