mirror of
https://github.com/notwa/rc
synced 2024-06-26 09:07:12 -07:00
63 lines
1.5 KiB
Bash
Executable File
63 lines
1.5 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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argc() { ### @- validate the number of arguments in a function.
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### ```sh
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### # usage: myfunc() { argc -(eq|le|ge) [0-9] "$0" "$@" || return; }
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###
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### myfunc() {
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### # use one of the following:
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### argc -eq N "$0" "$@" || return
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### argc -le N "$0" "$@" || return
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### argc -ge N "$0" "$@" || return
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### # where N is an integer between 0 and 9.
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### }
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### ```
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# local usage='usage: myfunc() { %s -(eq|lt|gt|le|ge) [0-9] "$0" "$@" || return; }\n'
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local usage='usage: myfunc() { %s -(eq|le|ge) [0-9] "$0" "$@" || return; }\n'
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# note that $zero can be empty, but must be set.
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if [ $# -lt 3 ] || [ -z "$1" ] || [ -z "$2" ] || [ "${3+x}" != x ]; then
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printf "$usage" argc >&2
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return 2
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fi
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local cond="$1"; shift
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local want="$1"; shift
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local zero="$1"; shift
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local many='' plural=''
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[ "$want" = 1 ] || plural='s'
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case "$cond" in
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'-eq') many='exactly';;
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# '-lt') many='fewer than';;
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# '-gt') many='more than';;
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'-le') many='at most';;
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'-ge') many='at least';;
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*)
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printf "$usage" argc >&2
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return 2;;
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esac
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case "$want" in
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[0-9]) :;; # no error, continue.
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*)
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printf "$usage" argc >&2
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return 2;;
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esac
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if [ ! $# "$cond" "$want" ]; then
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local err="expected $many $want argument$plural, got"
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printf '%s: %s %s\n' "$zero" "$err" "$#" >&2
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return 1
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fi
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return 0
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}
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[ -n "${preload+-}" ] || argc "$@"
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