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58 lines
1.3 KiB
58 lines
1.3 KiB
6 years ago
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#!/usr/bin/env bash
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#
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# usage: xargs_by_dir.sh cmd [args...] < pathnames
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#
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# Run a command with pathnames given over stdin, grouping pathnames by its
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# dirname and supplying each invocation of the command with pathnames in the
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# same directory. This is useful for commands that require all pathname
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# arguments to be in the same directory, such as go generate.
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set -eu
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dirname() {
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case "${1}" in
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*/*) echo "${1%/*}";;
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*) echo ".";;
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esac
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}
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unset -v cmd ok
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declare -a cmd=("${@}")
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ok=true
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run_cmd() {
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case $# in 0) return;; esac
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"${cmd[@]}" "${@}" || ok=false
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}
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# sort the input list by directory; replace stdin with the sorted list
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unset -v sorted_list
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trap 'case "${sorted_list-}" in ?*) rm -f "${sorted_list}";; esac' EXIT
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sorted_list=$(mktemp)
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sort -t/ > "${sorted_list}"
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exec < "${sorted_list}"
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unset -v last_dir dir path
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set --
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while read -r path
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do
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# dirname of the next item to consider
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dir=$(dirname "${path}")
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# the same dir as the last one?
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case "${last_dir-}" in
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"${dir}")
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# same dir; do not flush the list
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;;
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*)
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# dir change; run with items seen so far and flush the list
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run_cmd "${@}"
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set --
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;;
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esac
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# add the item, update the last-seen dir for the next iteration
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set -- "${@}" "${path}"
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last_dir="${dir}"
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done
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# seen the last file; run with items seen so far
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run_cmd "${@}"
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${ok} && exit 0 || exit 1
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