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#!/usr/bin/env bash
#
# Run commands when a folder content changes.
#
# Alternatives:
#
# * https://github.com/quitesimpleorg/adhocify
# * https://tracker.debian.org/pkg/inotify-hookable
# * https://metacpan.org/dist/App-Inotify-Hookable
# Parameters
BASENAME="`basename $0`"
WATCHED="$1"
COMMAND="$2"
# Listened inotify events
#
# See inotifywait(0) for the full list and description of all supported events.
#
# By default, exclude "access", "close", "close_write", "close_nowrite", "open"
# from the list of events
INOTIFY_EVENTS="-e modify -e attrib -e moved_to -e moved_from -e move -e move_self -e create -e delete -e delete_self -e unmount"
# Check
if [ -z "$COMMAND" ]; then
echo "usage: $BASENAME <folder> <command> [args]"
exit 1
elif [ ! -e "$WATCHED" ]; then
echo "error: file or folder not found: $WATCHED"
exit 1
fi
# Shift
shift 2
# Normalize folder name
if [ -d "$WATCHED" ]; then
WATCHED="`cd $WATCHED &> /dev/null && pwd`"
fi
# UX
echo "Watching $WATCHED to exec \"$COMMAND $*\" upon changes..."
# Dispatch
# Excluding any .git folder from being watched
while inotifywait $INOTIFY_EVENTS --exclude '.*.git.*' -r $WATCHED; do
$COMMAND $*
done
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