fish-shell/share/functions/vared.fish

#
# This is a neat function, stolen from zsh. It allows you to edit the
# value of a variable interactively.
#

function vared --description "Edit variable value"
	if test (count $argv) = 1
		switch $argv

			case '-h' '--h' '--he' '--hel' '--help'
				__fish_print_help vared
				return 0

			case '-*'
				printf (_ "%s: Unknown option %s\n") vared $argv
				return 1

			case '*'
				if test (count $$argv ) -lt 2
					set -l init ''
					if test $$argv
						set init $$argv
					end
					set -l prompt 'set_color green; echo '$argv'; set_color normal; echo "> "'
					if read -p $prompt -c $init tmp

						# If variable already exists, do not add any
						# switches, so we don't change export rules. But
						# if it does not exist, we make the variable
						# global, so that it will not die when this
						# function dies

						if test $$argv
							set $argv $tmp
						else
							set -g $argv $tmp
						end
					end
				else

					printf (_ '%s: %s is an array variable. Use %svared%s %s[n] to edit the n:th element of %s\n') $argv (set_color $fish_color_command) (set_color $fish_color_normal) vared $argv $argv
				end
		end
	else
		printf (_ '%s: Expected exactly one argument, got %s.\n\nSynopsis:\n\t%svared%s VARIABLE\n') vared (count $argv) (set_color $fish_color_command) (set_color $fish_color_normal)
	end
end