mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-11-26 10:43:47 +08:00
443fc66048
The extra things `eval` does are all for code that runs interactively. Because we just define a function, we don't need it. This improves alias' performance by about 20-25% (0.783608s to 0.585585s on about 500 aliases) and avoids triggering #3345.
65 lines
1.9 KiB
Fish
65 lines
1.9 KiB
Fish
function alias --description 'Legacy function for creating shellscript functions using an alias-like syntax'
|
|
if count $argv > /dev/null
|
|
switch $argv[1]
|
|
case -h --h --he --hel --help
|
|
__fish_print_help alias
|
|
return 0
|
|
end
|
|
end
|
|
|
|
set -l name
|
|
set -l body
|
|
set -l prefix
|
|
set -l first_word
|
|
switch (count $argv)
|
|
|
|
case 0
|
|
echo "Fish implements aliases using functions. Use 'functions' builtin to see list of functions and 'functions function_name' to see function definition, type 'help alias' for more information."
|
|
return 1
|
|
case 1
|
|
set -l tmp (string replace -r "=" '\n' -- $argv) ""
|
|
set name $tmp[1]
|
|
set body $tmp[2]
|
|
|
|
case 2
|
|
set name $argv[1]
|
|
set body $argv[2]
|
|
|
|
case \*
|
|
printf ( _ "%s: Expected one or two arguments, got %d\n") alias (count $argv)
|
|
return 1
|
|
end
|
|
|
|
# sanity check
|
|
if test -z "$name"
|
|
printf ( _ "%s: Name cannot be empty\n") alias
|
|
return 1
|
|
else if test -z "$body"
|
|
printf ( _ "%s: Body cannot be empty\n") alias
|
|
return 1
|
|
end
|
|
|
|
# Extract the first command from the body
|
|
# This is supposed to replace all non-escaped (i.e. preceded by an odd number of `\`) spaces with a newline
|
|
# so it splits on them
|
|
set -l tmp (string replace -ra "([^\\\ ])((\\\\\\\)*) " '$1\n' $body)
|
|
set first_word (string trim $tmp[1])
|
|
if set -q tmp[2]
|
|
set body $tmp[2..-1]
|
|
else
|
|
set body
|
|
end
|
|
|
|
# Prevent the alias from immediately running into an infinite recursion if
|
|
# $body starts with the same command as $name.
|
|
|
|
if test $first_word = $name
|
|
if contains $name (builtin --names)
|
|
set prefix builtin
|
|
else
|
|
set prefix command
|
|
end
|
|
end
|
|
echo "function $name --wraps $first_word; $prefix $first_word $body \$argv; end" | source
|
|
end
|