82 lines
2.5 KiB
Ruby
82 lines
2.5 KiB
Ruby
class String
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def undent
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gsub(/^[ \t]{#{(slice(/^[ \t]+/) || '').length}}/, "")
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end
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# eg:
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# if foo then <<-EOS.undent_________________________________________________________72
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# Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do
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# eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad
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# minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip
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# ex ea commodo consequat. Duis aute irure dolor in reprehenderit in
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# voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur
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# sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt
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# mollit anim id est laborum.
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# EOS
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alias_method :undent_________________________________________________________72, :undent
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# String.chomp, but if result is empty: returns nil instead.
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# Allows `chuzzle || foo` short-circuits.
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def chuzzle
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s = chomp
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s unless s.empty?
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end
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def strip_prefix(prefix)
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start_with?(prefix) ? self[prefix.length..-1] : self
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end
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end
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class NilClass
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def chuzzle; end
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end
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# used by the inreplace function (in utils.rb)
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module StringInreplaceExtension
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attr_accessor :errors
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def self.extended(str)
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str.errors = []
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end
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def sub!(before, after)
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result = super
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unless result
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errors << "expected replacement of #{before.inspect} with #{after.inspect}"
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end
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result
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end
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# Warn if nothing was replaced
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def gsub!(before, after, audit_result = true)
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result = super(before, after)
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if audit_result && result.nil?
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errors << "expected replacement of #{before.inspect} with #{after.inspect}"
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end
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result
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end
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# Looks for Makefile style variable defintions and replaces the
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# value with "new_value", or removes the definition entirely.
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def change_make_var!(flag, new_value)
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unless gsub!(/^#{Regexp.escape(flag)}[ \t]*=[ \t]*(.*)$/, "#{flag}=#{new_value}", false)
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errors << "expected to change #{flag.inspect} to #{new_value.inspect}"
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end
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end
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# Removes variable assignments completely.
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def remove_make_var!(flags)
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Array(flags).each do |flag|
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# Also remove trailing \n, if present.
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unless gsub!(/^#{Regexp.escape(flag)}[ \t]*=.*$\n?/, "", false)
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errors << "expected to remove #{flag.inspect}"
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end
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end
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end
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# Finds the specified variable
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def get_make_var(flag)
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self[/^#{Regexp.escape(flag)}[ \t]*=[ \t]*(.*)$/, 1]
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end
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end
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