mirror of
https://github.com/fish-shell/fish-shell
synced 2024-11-15 01:17:45 +00:00
75 lines
2.5 KiB
Fish
75 lines
2.5 KiB
Fish
function alias --description 'Creates a function wrapping a command'
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set -l options h/help s/save
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argparse -n alias --max-args=2 $options -- $argv
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or return
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if set -q _flag_help
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__fish_print_help alias
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return 0
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end
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set -l name
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set -l body
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set -l prefix
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if not set -q argv[1]
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# Print the known aliases.
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for func in (functions -n)
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set -l output (functions $func | string match -r -- "^function .* --description (?:'alias (.*)'|alias\\\\ (.*))\$")
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if set -q output[2]
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set output (string replace -r -- '^'(string escape --style=regex -- $func)'[= ]' '' $output[2])
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echo alias $func (string escape -- $output[1])
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end
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end
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return 0
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else if not set -q argv[2]
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# Alias definition of the form "name=value".
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set -l tmp (string split -m 1 "=" -- $argv) ""
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set name $tmp[1]
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set body $tmp[2]
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else
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# Alias definition of the form "name value".
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set name $argv[1]
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set body $argv[2]
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end
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# sanity check
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if test -z "$name"
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printf ( _ "%s: name cannot be empty\n") alias >&2
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return 1
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else if test -z "$body"
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printf ( _ "%s: body cannot be empty\n") alias >&2
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return 1
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end
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# Extract the first command from the body.
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printf '%s\n' $body | read -l --list words
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set -l first_word $words[1]
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set -l last_word $words[-1]
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# Prevent the alias from immediately running into an infinite recursion if
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# $body starts with the same command as $name.
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if test $first_word = $name
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if contains $name (builtin --names)
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set prefix builtin
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else
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set prefix command
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end
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end
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set -l cmd_string (string escape -- "alias $argv")
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# Do not define wrapper completion if we have "alias foo 'foo xyz'" or "alias foo 'sudo foo'"
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# This is to prevent completions from recursively calling themselves (#7389).
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# The latter will have rare false positives but it's more important to
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# prevent recursion for this high-level command.
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set -l wraps
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if test $first_word != $name; and test $last_word != $name
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set wraps --wraps (string escape -- $body)
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end
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echo "function $name $wraps --description $cmd_string; $prefix $body \$argv
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end" | source # The function definition in split in two lines to ensure that a '#' can be put in the body.
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if set -q _flag_save
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funcsave $name
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end
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end
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