97 lines
2.9 KiB
Bash
Executable file
97 lines
2.9 KiB
Bash
Executable file
#!/usr/bin/env bash
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_VERSION="0.2.0"
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function help() {
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I=" "
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cat << USAGE
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fsw - run a command when a file is modified - v$_VERSION
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Usage:
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${I}fsw <command> [filter] [dirs...]
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${I}command - the specified bash command to eval
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${I}filter - an optional filename filter
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${I}dirs - the directories to watch (defaults to current directory)
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Advanced:
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${I}Command Variables:
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${I}${I}Your commands have runtime access to some variables associated with the
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${I}${I}${I}inotifywait event enabling further extensibility:
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${I}${I}+ FSW_FILENAME - the name of the file
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${I}${I}+ FSW_DIR - the directory containing the file
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${I}${I}+ FSW_PATH - the full relative path of the file
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${I}${I}+ FSW_FILE_EVENTS - a comma-separated list of the inotify events
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${I}Environment:
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${I}${I}Some customization options exist using environment variables
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${I}${I}${I}due to their uncommon usage.
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${I}${I}+ FSW_EVENTS - the list of events to have inotifywait observe
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References:
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${I}+ Filter works with grep -P
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${I}+ See inotifywait(1) for FSW_EVENTS options.
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Examples:
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${I}fsw 'make' '\.c$'
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${I}fsw 'bash \$filename' '\.bash$'
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${I}fsw 'mix test --failed' '.exs?$' lib test
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${I}FSW_EVENTS=open,access fsw 'espeak "Intruder Alert!"' \\
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${I}${I}${I}'.*' /etc/secrets \$HOME/.secrets
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USAGE
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}
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dbg() {
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if [[ -n ${FSW_DEBUG+x} ]]; then
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echo -e "[debug] fsw: $*"
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fi
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}
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contains_element () {
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local e match="$1"; shift
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for e; do [[ "$e" == "$match" ]] && return 0; done
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return 1
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}
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if [[ $1 = '-h' ]] || [[ $1 = '--help' ]] || [[ -z $1 ]]; then
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help
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exit 0
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fi
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FSW_EVENTS="${FSW_EVENTS:-close_write}"
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dbg "Events: $FSW_EVENTS"
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SHELL_COMMAND="${1}"; shift
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dbg "Command: $SHELL_COMMAND"
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FILTER="${1}"; shift
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dbg "Filter: $FILTER"
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dbg "Directory: ${1}"
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DIRS=("${1:-.}"); shift
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if [[ -e $FILTER ]]; then
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# TODO: this is a sad hack/workaround
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echo "It looks like your filter is an actual file. I'll just watch that for you."
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DIRS=("${FILTER}")
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fi
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while [[ -n $1 ]] && realpath "$1" &> /dev/null; do
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dbg "Directory: ${1}"
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DIRS+=("$1"); shift
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done
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inotifywait -m -e "${FSW_EVENTS},delete,delete_self" -r "${DIRS[@]}" 2>&1 \
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| grep --line-buffered -v ' Beware: since -r was given, this may take a while!' \
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| while read -r dir events filename; do
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if contains_element "$dir" "${DIRS[@]}" && [[ $events =~ "delete" ]]; then
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echo "One of the watched directories (\"$dir\") was deleted. Exiting..."
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exit 75
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fi
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if [[ "$dir $events" = "Watches established." ]]; then
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echo "Ready."
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dbg "Directory: ${DIRS[*]}"
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else
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export FSW_FILENAME="$filename"
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export FSW_DIR="$dir"
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export FSW_PATH="$dir$filename"
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export FSW_FILE_EVENTS="$events"
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export FSW_EVENT="$events $dir$filename"
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dbg "Event:\n $(date)\n $FSW_PATH\n $FILTER\n $FSW_EVENT\n $dir $events $filename\n ${SHELL_COMMAND}"
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dbg "Filtered Event: $(<<< "$FSW_PATH" grep -P "$FILTER")"
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<<< "$FSW_PATH" grep -P "$FILTER" > /dev/null 2>&1 && eval "${SHELL_COMMAND}"
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fi
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done
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