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# Contains backports from newer versions of Ruby
require_relative "../vendor/backports/string"
class String
# String.chomp, but if result is empty: returns nil instead.
# Allows `chuzzle || foo` short-circuits.
def chuzzle
s = chomp
s unless s.empty?
end
def strip_prefix(prefix)
start_with?(prefix) ? self[prefix.length..-1] : self
end
end
class NilClass
def chuzzle; end
end
# used by the inreplace function (in utils.rb)
module StringInreplaceExtension
attr_accessor :errors
def self.extended(str)
str.errors = []
end
def sub!(before, after)
result = super
unless result
errors << "expected replacement of #{before.inspect} with #{after.inspect}"
end
result
end
# Warn if nothing was replaced
def gsub!(before, after, audit_result = true)
result = super(before, after)
if audit_result && result.nil?
errors << "expected replacement of #{before.inspect} with #{after.inspect}"
end
result
end
# Looks for Makefile style variable definitions and replaces the
# value with "new_value", or removes the definition entirely.
def change_make_var!(flag, new_value)
return if gsub!(/^#{Regexp.escape(flag)}[ \t]*=[ \t]*(.*)$/, "#{flag}=#{new_value}", false)
errors << "expected to change #{flag.inspect} to #{new_value.inspect}"
end
# Removes variable assignments completely.
def remove_make_var!(flags)
Array(flags).each do |flag|
# Also remove trailing \n, if present.
unless gsub!(/^#{Regexp.escape(flag)}[ \t]*=.*$\n?/, "", false)
errors << "expected to remove #{flag.inspect}"
end
end
end
# Finds the specified variable
def get_make_var(flag)
self[/^#{Regexp.escape(flag)}[ \t]*=[ \t]*(.*)$/, 1]
end
end
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