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module RGhost
# A cross-platform way of finding an executable in the $PATH.
#
# RGhost::Which.('ruby') #=> /usr/bin/ruby
class Which
def self.call(cmd)
new.call(cmd)
end
def initialize(env: ENV)
@env = env
end
def call(cmd)
cmd_path = Pathname(cmd)
return cmd_path.to_path if cmd_path.absolute? && cmd_path.executable?
extensions = fetch_executable_extensions
env.fetch("PATH", "").split(File::PATH_SEPARATOR).each do |path|
path = Pathname(path)
extensions.each do |ext|
exe = path.join("#{cmd}#{ext}")
return exe.to_path if exe.executable?
end
end
nil
end
private
attr_reader :env
def fetch_executable_extensions
# Get list of executable extensions on Windows
env.fetch("PATHEXT", "").split(";").tap do |extensions|
# On non-Windows this is empty; add ""to search for extension-less files
extensions.push("") if extensions.empty?
end
end
end
end
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