mirror of
https://github.com/notwa/rc
synced 2024-06-01 15:33:07 -07:00
32 lines
1.2 KiB
Bash
Executable File
32 lines
1.2 KiB
Bash
Executable File
#!/usr/bin/env sh
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# YES_ZSH
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# YES_BASH
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# YES_DASH
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# YES_ASH
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has() ( ### @- print the result of `which` if the program is found, else simply return 1.
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### ```
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### export SOLVER="$(has kissat || has picosat || has cadical || has minisat)"
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### ```
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fancy=0
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[ -z "$ZSH_VERSION" ] && [ -z "$BASH_VERSION" ] || fancy=1
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if [ "${1:-/}" = "${1#*[!A-Za-z_-]}" ]; then # has a simple name?
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if [ $fancy = 0 ] || [ "${1:-/}" = "${1#-}" ]; then
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# only ash and dash support aliases beginning with hyphens.
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# forcefully unalias it (regardless of if it even was an alias):
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alias "$1"=
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unalias "$1"
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fi
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if [ $fancy = 1 ] || [ "${1:-/}" = "${1#*-}" ]; then
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# only bash and zsh support function names containing hyphens.
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# forcefully unset it (regardless of if it even was a function):
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eval "$1() (:)"
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unset -f "$1"
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fi
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fi
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which -- "$1" >/dev/null 2>&1 && which -- "$1"
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) # this uses parentheses instead of braces so that the function is always run
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# in a subshell. otherwise, the user's aliases and functions may be overwritten.
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[ -n "${preload+-}" ] || has "$@"
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