mirror of
https://github.com/fish-shell/fish-shell
synced 2024-12-26 04:43:10 +00:00
73 lines
2.5 KiB
Fish
73 lines
2.5 KiB
Fish
function alias --description 'Creates a function wrapping a command'
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set -l options 'h/help'
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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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set -l first_word
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set -l wrapped_cmd
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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 $func | string match -r -- "^function .* --description 'alias (.*)'")
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if set -q output[2]
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set output (string replace -r -- '^'$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
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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
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return 1
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end
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# Extract the first command from the body. This is supposed to replace all non-escaped (i.e.
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# preceded by an odd number of `\`) spaces with a newline so it splits on them. See issue #2220
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# for why the following borderline incomprehensible code exists.
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set -l tmp (string replace -ra -- "([^\\\ ])((\\\\\\\)*) " '$1\n' $body)
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set first_word (string trim -- $tmp[1])
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# If the user does something like `alias x 'foo; bar'` we need to strip the semicolon.
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set base_command (string trim -c ';' -- $first_word)
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if set -q tmp[2]
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set body $tmp[2..-1]
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else
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set body
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end
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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 $base_command = $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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set wrapped_cmd (string join ' ' -- $first_word $body | string escape)
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echo "function $name --wraps $wrapped_cmd --description $cmd_string; $prefix $first_word $body \$argv; end" | source
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#echo "function $name --wraps $wrapped_cmd --description $cmd_string; $prefix $first_word $body \$argv; end"
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end
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