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36 lines
835 B
Bash
Executable File
36 lines
835 B
Bash
Executable File
#!/bin/sh
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## SPDX-FileCopyrightText: 2023 Benjamin Grande M. S. <ben.grande.b@gmail.com>
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##
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## SPDX-License-Identifier: AGPL-3.0-or-later
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## Detect if program exists, fail otherwise.
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## With the option '-s', it prints the path to the utility that exists.
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## Usage: has program
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## Usage: has -s program alternative
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## Example: has vim
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## Example: has -s vim vim.tiny vi
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set -eu
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## The 'command' program fails to detect builtin programs.
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has_cmd="command -v"
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command -v which >/dev/null 2>&1 && has_cmd="which"
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action=""
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test -n "${1-}" || exit 1
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case "$1" in
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-s) action=show; shift; test -n "${1-}" || exit 1;;
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esac
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for prog in "${@}"; do
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cmd="$(${has_cmd} "${prog}" 2>/dev/null)" || continue
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test -x "${cmd}" || continue
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case "${action-}" in
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show) printf '%s\n' "${cmd}"; exit 0;;
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*) exit 0;;
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esac
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done
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exit 1
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