fish-shell/share/functions/man.fish

function man --description "Format and display the on-line manual pages"

	# Work around OS X's "builtin" manpage that everything symlinks to,
	# by prepending our fish datadir to man. This also ensures that man gives fish's
	# man pages priority, without having to put fish's bin directories first in $PATH
	# Temporarily set a MANPATH, unless one is set already
	if not set -q MANPATH
		set -l fish_manpath (dirname $__fish_datadir)/fish/man
		if test -d "$fish_manpath"
			# Notice local but exported variable
			set -lx MANPATH "$fish_manpath":(command man --path)
			
			# Invoke man with this manpath, and we're done
			command man $argv
			return
		end
	end
	
	# If MANPATH is set explicitly, or fish's man pages could not be found,
	# just invoke man normally
	command man $argv
end