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distinguish names from flags in has

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This commit is contained in:
Connor Olding 2021-10-13 20:22:10 -07:00
parent e522d065bf
commit 2417352229
2 changed files with 19 additions and 10 deletions
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9
home/-shrc
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@ -8,11 +8,14 @@ has() ( # hardcoded here for convenience. refer to ~/sh/has for documentation.
if [ "${1:-/}" = "${1#*[!A-Za-z_-]}" ]; then
if [ "$FANCY" = 0 ] || [ "${1:-/}" = "${1#-}" ]; then
alias "$1"=
unalias "$1"
unalias -- "$1"
fi
if [ "$FANCY" = 1 ] || [ "${1:-/}" = "${1#*-}" ]; then
if [ "$FANCY" = 1 ]; then
eval -- "$1() (:)"
unset -f -- "$1"
elif [ "${1:-/}" = "${1#*-}" ]; then
eval "$1() (:)"
unset -f "$1"
unset -f -- "$1"
fi
fi
which -- "$1" >/dev/null 2>&1 && which -- "$1"

20
sh/has
View File

@ -10,20 +10,26 @@ has() ( ### @- print the result of `which` if the program is found, else simply
### ```
fancy=0
[ -z "$ZSH_VERSION" ] && [ -z "$BASH_VERSION" ] || fancy=1
if [ "${1:-/}" = "${1#*[!A-Za-z_-]}" ]; then # has a simple name?
# only ash and dash support aliases beginning with hyphens.
# forcefully unalias it (regardless of if it even was an alias):
if [ $fancy = 0 ] || [ "${1:-/}" = "${1#-}" ]; then
# only ash and dash support aliases beginning with hyphens.
# forcefully unalias it (regardless of if it even was an alias):
alias "$1"=
unalias "$1"
unalias -- "$1"
fi
if [ $fancy = 1 ] || [ "${1:-/}" = "${1#*-}" ]; then
# only bash and zsh support function names containing hyphens.
# forcefully unset it (regardless of if it even was a function):
# only bash and zsh support function names containing hyphens.
# forcefully unset it (regardless of if it even was a function):
if [ "$FANCY" = 1 ]; then
eval -- "$1() (:)"
unset -f -- "$1"
elif [ "${1:-/}" = "${1#*-}" ]; then
eval "$1() (:)"
unset -f "$1"
unset -f -- "$1"
fi
fi
which -- "$1" >/dev/null 2>&1 && which -- "$1"
) # this uses parentheses instead of braces so that the function is always run
# in a subshell. otherwise, the user's aliases and functions may be overwritten.