prepare to use ports instead of pipes, if needed

lib/cli-common.js

@@ -4,6 +4,7 @@ var common = module.exports;
 
 var path = require('path');
 var url = require('url');
+var fs = require('fs');
 var mkdirp = require('mkdirp');
 var os = require('os');
 var homedir = os.homedir();
@@ -30,7 +31,50 @@ common.CONFIG_KEYS = [
 //, '_otp'         // otp should not be saved
 //, '_token'       // temporary token
 
-common.pipename = function (config, newApi) {
+common.getPort = function (config, cb) {
+  var portfile = path.resolve(config.sock || common.DEFAULT_SOCK_PATH, '..', 'telebit.port');
+  if (cb) {
+    return fs.readFile(portfile, 'utf8', function (err, text) {
+      cb(err, parseInt((text||'').trim(), 10) || null);
+    });
+  } else {
+    try {
+      return parseInt(fs.readFileSync(portfile, 'utf8').trim(), 10) || null;
+    } catch(e) {
+      return null;
+    }
+  }
+};
+common.setPort = function (config, num, cb) {
+  var portfile = path.resolve(config.sock || common.DEFAULT_SOCK_PATH, '..', 'telebit.port');
+  var numstr = (num || '').toString();
+  if (cb) {
+    return fs.writeFile(portfile, numstr, 'utf8', function (err) {
+      cb(err);
+    });
+  } else {
+    try {
+      return fs.writeFileSync(portfile, numstr, 'utf8');
+    } catch(e) {
+      return null;
+    }
+  }
+};
+common.removePort = function (config, cb) {
+  var portfile = path.resolve(config.sock || common.DEFAULT_SOCK_PATH, '..', 'telebit.port');
+  if (cb) {
+    return fs.unlink(portfile, function (err, text) {
+      cb(err, (text||'').trim());
+    });
+  } else {
+    try {
+      return fs.unlinkSync(portfile);
+    } catch(e) {
+      return null;
+    }
+  }
+};
+common.pipename = function (config) {
   var _ipc = {
     path: (config.sock || common.DEFAULT_SOCK_PATH)
   , comment: (/^win/i.test(os.platform()) ? 'windows pipe' : 'unix socket')
@@ -39,10 +83,7 @@ common.pipename = function (config, newApi) {
   if ('pipe' === _ipc.type) {
     _ipc.path = '\\\\?\\pipe' + _ipc.path.replace(/\//, '\\');
   }
-  if (newApi) {
   return _ipc;
-  }
-  return _ipc.path;
 };
 common.DEFAULT_SOCK_PATH = path.join(homedir, '.local/share/telebit/var/run', 'telebit.sock');
 common.DEFAULT_CONFIG_PATH = path.join(homedir, '.config/telebit', 'telebitd.yml');