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https://github.com/fish-shell/fish-shell
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9dd0c47d0b
If the first word of the alias body ends with a semicolon we need to strip that character, and otherwise escape the extracted command, to ensure the subsequent function definition is valid. Fixes #3860
73 lines
2.4 KiB
Fish
73 lines
2.4 KiB
Fish
function alias --description 'Creates a function wrapping a command'
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if count $argv >/dev/null
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switch $argv[1]
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case -h --h --he --hel --help
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__fish_print_help alias
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return 0
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end
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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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switch (count $argv)
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case 0
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for func in (functions -n)
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set -l output (functions $func | string match -r -- "function .* --description '(alias .*)'" | string split \n)
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set -q output[2]
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and echo $output[2]
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end
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return 0
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case 1
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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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case 2
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set name $argv[1]
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set body $argv[2]
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case \*
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printf ( _ "%s: Expected one or two arguments, got %d\n") alias (count $argv)
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return 1
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end
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# sanity check
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if test -z "$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 wrapped_cmd (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 $wrapped_cmd = $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 escape $wrapped_cmd)
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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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