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watcher.ts
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watcher.ts
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/* IMPORT */
import * as _ from 'lodash';
import * as fs from 'fs';
/* IMPORT LAZY */
const laxy = require ( 'laxy' ),
chokidar = laxy ( () => require ( 'chokidar' ) )();
/* WATCHER */
//TODO: Maybe switch to `https://github.com/Axosoft/nsfw`
function watcher ( root: string, options = {}, callbacks = {} ) {
/* VARIABLES */
let filesStats = {}, // filePath => fs.Stats
renameSignalers = {}, // ino => Function
renameTimeout = 150; // Amount of time to wait for the complementary add/unlink event
/* HELPERS */
function emit ( event: string, args: any[] ) {
if ( !callbacks[event] ) return;
callbacks[event].apply ( undefined, args );
}
/* HANDLERS */
function change ( filePath: string, stats: fs.Stats ) {
emit ( 'change', [filePath, stats] );
}
function add ( filePath: string, stats: fs.Stats ) {
stats = stats || {}; // Just to be safe
filesStats[filePath] = stats;
const renameSignaler = renameSignalers[stats.ino];
if ( renameSignaler ) { // Rename
const prevPath = renameSignaler ();
emit ( 'rename', [prevPath, filePath, stats] );
} else {
const timeoutId = setTimeout ( () => { // Added
delete renameSignalers[stats.ino];
emit ( 'add', [filePath, stats] );
}, renameTimeout );
renameSignalers[stats.ino] = () => { // Renamed
clearTimeout ( timeoutId );
delete renameSignalers[stats.ino];
return filePath;
};
}
}
function unlink ( filePath: string ) {
const stats = filesStats[filePath] || {}; // Just to be safe
const renameSignaler = renameSignalers[stats.ino];
if ( renameSignaler ) { // Rename
const newPath = renameSignaler ();
emit ( 'rename', [filePath, newPath, stats] );
} else {
const timeoutId = setTimeout ( () => { // Deleted
delete renameSignalers[stats.ino];
emit ( 'unlink', [filePath] );
}, renameTimeout );
renameSignalers[stats.ino] = () => { // Renamed
clearTimeout ( timeoutId );
delete renameSignalers[stats.ino];
return filePath;
};
}
}
/* CHOKIDAR */
const chokidarOptions = _.merge ( {}, options, { ignoreInitial: false } );
return chokidar.watch ( root, chokidarOptions ).on ( 'add', add ).on ( 'change', change ).on ( 'unlink', unlink );
}
/* EXPORT */
export default watcher;