f630b2bbdb
Watch was spitting out no such file or directory errors, that I think were caused by a race between updating the status bar, and removing items. Signed-off-by: Willow Barraco <contact@willowbarraco.fr>
160 lines
2.7 KiB
Bash
Executable File
160 lines
2.7 KiB
Bash
Executable File
#!/bin/sh
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# SPDX-License-Identifier: AGPL-3.0-only
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# Copyright 2022 Sxmo Contributors
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# A pretty generic status content generator
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# It aggregate all file content present in a folder
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# It sort file elements numerically
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# It can watch file events to stdout new content
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ROOT="$XDG_RUNTIME_DIR/sxmo_status/${SXMO_STATUS_NAME:-default}"
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mkdir -p "$ROOT"
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exec 3> "$XDG_RUNTIME_DIR/sxmo_status/sxmo_status.lock"
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_sorted_components_name() {
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find "$ROOT" -mindepth 1 -exec 'basename' '{}' ';' | sort -n
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}
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lock_ex() {
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flock -x 3
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}
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lock_sh() {
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flock -s 3
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}
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free() {
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flock -u 3
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}
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usage() {
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printf "Usage: %s [ACTIONS]\n" "$(basename "$0")" >&2
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printf "ACTIONS:\n" >&2
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printf " -s: the status content (default action)\n" >&2
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printf " -w: file events and stdout status content\n" >&2
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printf " -a <id> <priority> <content>: add a bar component\n" >&2
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printf " -d <id>: remove a bar component\n" >&2
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printf " -r: remove all bar components\n" >&2
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printf " -D: the status content explained\n" >&2
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printf " -h: this message\n" >&2
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}
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add() {
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id=
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priority=
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value=
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lock_ex
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while [ -n "$*" ]; do
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arg="$1"
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shift
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case "$arg" in
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"-f"|"-b"|"-t"|"-e")
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shift # we shallow this
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;;
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*)
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if [ -z "$id" ]; then
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id="$arg"
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elif [ -z "$priority" ]; then
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priority="$arg"
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elif [ -z "$value" ]; then
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value="$arg"
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fi
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;;
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esac
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done
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if [ -z "$id" ] || [ -z "$priority" ]; then
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printf "usage: %s -a <id> <priority> <value>\n" "$(basename "$0")" >&2
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exit 1
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fi
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del "$id"
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id="$priority-$id"
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if [ -n "$value" ]; then
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printf "%s" "$value" > "$ROOT"/"$id"
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fi
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free
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}
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del() {
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lock_ex
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id="$1"
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shift
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if [ -z "$id" ]; then
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printf "usage: %s -d <id>\n" "$(basename "$0")" >&2
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exit 1
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fi
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_sorted_components_name | grep -m1 "\-$id$" | xargs -rI{} rm -f "$ROOT"/"{}"
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free
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}
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show() {
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lock_sh
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_sorted_components_name | while read -r id; do
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tr '\n' ' ' < "$ROOT/$id"
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printf " "
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done | head -c -1 | tr '\n' '\0' | xargs -0 -n1 printf "%s\n"
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free
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}
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debug() {
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lock_sh
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_sorted_components_name | while read -r id; do
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printf "%s\n>" "$id"
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tr '\n' ' ' < "$ROOT/$id"
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printf "<\n"
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done
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free
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}
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watch() {
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FIFO="$(mktemp -u)"
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mkfifo "$FIFO"
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inotifywait -mq -e "close_write,move,delete" "$ROOT" >> "$FIFO" &
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NOTIFYPID=$!
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# shellcheck disable=SC2317
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finish() {
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kill "$NOTIFYPID"
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rm "$FIFO"
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exit 0
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}
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trap 'finish' TERM INT
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show
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# shellcheck disable=SC2034
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while read -r _; do
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show
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done < "$FIFO"
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}
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reset() {
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lock_ex
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find "$ROOT" -mindepth 1 -delete
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free
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}
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if [ -n "$*" ]; then
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action="$1"
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shift
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fi
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case "$action" in
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""|"-s") show ;;
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"-w") watch "$@" ;;
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"-r") reset "$@" ;;
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"-a") add "$@" ;;
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"-d") del "$@" ;;
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"-D") debug "$@" ;;
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"-h") usage ;;
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esac
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