feat(commands/run): introduce --client-path option

This commit enables users to pass a `--client-path` to the `run` command.
The path specifies the location to an already existing installation of the
Aragon client on the local machine, allowing developers to test custom versions
of the app.

Closes #199

src/commands/run.js

@@ -85,6 +85,9 @@ exports.builder = function (yargs) {
     description: 'Arguments for calling the app init function',
     array: true,
     default: [],
+  }).option('client-path', {
+    description: 'A path pointing to an existing Aragon client installation',
+    default: null
   })
 }
 
@@ -123,6 +126,7 @@ exports.handler = function ({
     httpServedFrom,
     appInit,
     appInitArgs,
+    clientPath
   }) {
   apmOptions.ensRegistryAddress = apmOptions['ens-registry']
   const showAccounts = accounts
@@ -230,6 +234,7 @@ exports.handler = function ({
       task: (ctx, task) => new TaskList([
         {
           title: 'Download wrapper',
+          skip: () => !!clientPath,
           task: (ctx, task) => {
             const WRAPPER_PATH = `${os.homedir()}/.aragon/wrapper-${WRAPPER_COMMIT}`
             ctx.wrapperPath = WRAPPER_PATH
@@ -255,7 +260,7 @@ exports.handler = function ({
         {
           title: 'Install wrapper dependencies',
           task: async (ctx, task) => (await installDeps(ctx.wrapperPath, task)),
-          enabled: (ctx) => !ctx.wrapperAvailable
+          enabled: (ctx) => !ctx.wrapperAvailable && !clientPath
         },
         {
           title: 'Start Aragon client',
@@ -266,12 +271,13 @@ exports.handler = function ({
             }
             const bin = getNodePackageManager()
             const startArguments = {
-              cwd: ctx.wrapperPath,
+              cwd: clientPath || ctx.wrapperPath,
               env: {
                 REACT_APP_ENS_REGISTRY_ADDRESS: ctx.ens,
                 BROWSER: 'none',
               }
             }
+
             execa(bin, ['run', 'start:local'], startArguments).catch((err) => { throw new Error(err) })
           }
         },