40 lines
1.1 KiB
Bash
40 lines
1.1 KiB
Bash
# shellcheck shell=bash
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#================================================================
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#% SYNOPSIS
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#+ current <cmd> [-f <flag>] [-r <regex>]
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#%
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#% OPTIONS
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#% -f set command-line args to pass to <cmd>; single string.
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#% Default: [--version]
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#% -r set regex used to extract version string from cmd output
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#% Default: [v?(\d+\.\d+\.\d+)]
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#================================================================
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current() {
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flag="--version"
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regex='v?(\d+\.\d+\.\d+)'
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declare -a args
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OPTIND=1
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while [ $OPTIND -le "$#" ]; do
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if getopts :f:r: opt; then
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case "$opt" in
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\?)
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diag "$(red "error: called 'current' badly")"
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;;
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f) flag="$OPTARG" ;;
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r) regex="$OPTARG" ;;
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esac
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else
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args+=("${!OPTIND}")
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(( OPTIND++ ))
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fi
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done
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set -- "${args[@]}"
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cmd="$1"
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if command -v "$cmd" >/dev/null; then
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bash -c "$cmd $flag" | perl -ne 'm/'"$regex"'/ && print "$1\n"' || true
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else
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true
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fi
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}
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