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require 'fileutils'
module FileUtils
if const_defined?(:Win32Exts)
Win32Exts.concat %w{.exe .com .bat .cmd}
Win32Exts.uniq!
else
Win32Exts = %w{.exe .com .bat .cmd}
end
module_function
# Looks for the first occurrence of _program_ within _path_.
#
# On the MS Windows platform, it looks for executables ending with .exe,
# .bat and .com, which you may optionally include in the program name.
# Returns <tt>nil</tt> if not found.
#
# CREDIT: Daniel J. Berger, Michael Granger
#
#--
# The which() method was adopted from Daniel J. Berger, via PTools
# which in in turn was adopted fromt the FileWhich code posted by
# Michael Granger on http://www.rubygarden.org.
#++
def which(prog, path=ENV['PATH'])
path.split(File::PATH_SEPARATOR).each {|dir|
# Windows checks against specific extensions
if File::ALT_SEPARATOR
ext = Win32Exts.find{|ext|
if prog.include?('.') # Assume extension already included
f = File.join(dir,prog)
else
f = File.join(dir,prog+ext)
end
File.executable?(f) && !File.directory?(f)
}
if ext
# Use backslashes, not forward slashes
if prog.include?('.') # Assume extension already included
f = File.join( dir, prog ).gsub(/\//,'\\')
else
f = File.join( dir, prog + ext ).gsub(/\//,'\\')
end
return f
end
else
f = File.join(dir,prog)
# Avoid /usr/lib/ruby, for example
if File.executable?(f) && !File.directory?(f)
return File::join( dir, prog )
end
end
}
nil
end
end
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