1'use strict'; 2 3var path = require('path'); 4var which = require('which'); 5var LRU = require('lru-cache'); 6 7var commandCache = new LRU({ max: 50, maxAge: 30 * 1000 }); // Cache just for 30sec 8 9function resolveCommand(command, noExtension) { 10 var resolved; 11 12 noExtension = !!noExtension; 13 resolved = commandCache.get(command + '!' + noExtension); 14 15 // Check if its resolved in the cache 16 if (commandCache.has(command)) { 17 return commandCache.get(command); 18 } 19 20 try { 21 resolved = !noExtension ? 22 which.sync(command) : 23 which.sync(command, { pathExt: path.delimiter + (process.env.PATHEXT || '') }); 24 } catch (e) { /* empty */ } 25 26 commandCache.set(command + '!' + noExtension, resolved); 27 28 return resolved; 29} 30 31module.exports = resolveCommand; 32