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class EmacsRequirement < Requirement
fatal true
default_formula "emacs"
def initialize(tags)
@version = tags.shift if /\d+\.*\d*/ =~ tags.first
super
end
satisfy build_env: false do
next false unless which "emacs"
next true unless @version
emacs_version = Utils.popen_read("emacs", "--batch", "--eval", "(princ emacs-version)")
Version.create(emacs_version) >= Version.create(@version)
end
env do
ENV.prepend_path "PATH", which("emacs").dirname
ENV["EMACS"] = "emacs"
end
def message
if @version
s = "Emacs #{@version} or later is required."
else
s = "Emacs is required."
end
s += super
s
end
def inspect
"#<#{self.class.name}: #{name.inspect} #{tags.inspect} version=#{@version.inspect}>"
end
end
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