[Launcher] Add helper for fzf

config/ags/launcher/helpers/fzf/src/fzf.ts

@@ -0,0 +1,27 @@
+import { search } from 'fast-fuzzy';
+import fs from 'fs';
+
+// Get list source from args
+// ARGS: type source
+// Then we read query from stdin to not restart indexing & the like for each keystroke
+
+let data: string[] = [];
+if ( process.argv[ 2 ] === 'fs' ) {
+    if ( process.argv[ 3 ].includes( '.json' ) ) {
+        data = JSON.parse( '' + fs.readFileSync( process.argv[ 3 ] ) );
+    } else if ( process.argv[ 3 ].includes( '.txt' ) ) {
+        data = ( '' + fs.readFileSync( process.argv[ 3 ] ) ).split( ',' );
+    } else if ( fs.statSync( process.argv[ 3 ] ).isDirectory() ) {
+        data = fs.readdirSync( process.argv[ 3 ] );
+    }
+} else if ( process.argv[ 2 ] === 'arg' ) {
+    data = process.argv[ 3 ].split( ',' );
+} else {
+    throw new Error( 'Invalid argument at position 1. Can be either fs or arg, not ' + process.argv[ 2 ] );
+}
+
+process.stdin.on( "data", ( query ) => {
+    // On stdin submit (which the other client will have to support) process data
+    
+    console.log( search( query.toString(), data ) );
+} );