From fe52033e36c0efff3af6a0c5e0aa42ecf3846412 Mon Sep 17 00:00:00 2001
From: Iuri Matias <iuri.matias@gmail.com>
Date: Tue, 8 Jan 2019 12:07:38 -0500
Subject: [PATCH] add command line options

---
 remix-simulator/bin/ethsim    | 27 +++++++++++++++++++++++++--
 remix-simulator/package.json  |  1 +
 remix-simulator/src/server.js |  4 ++--
 3 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/remix-simulator/bin/ethsim b/remix-simulator/bin/ethsim
index e819929748..20aea678cb 100755
--- a/remix-simulator/bin/ethsim
+++ b/remix-simulator/bin/ethsim
@@ -1,6 +1,29 @@
 #!/usr/bin/env node
 
-const Server = require('../src/server');
+const program = require('commander')
+const version = require('../package.json').version
+
+program
+  .command('version')
+  .description("outputs version number")
+  .action(() => {
+    console.log(version)
+    process.exit(0)
+  })
+
+program
+  .command('help')
+  .description("outputs usage information")
+  .action(() => {
+    program.help()
+    process.exit(0)
+  })
+
+program
+  .option('-p, --port [port]', 'specify port')
+  .parse(process.argv)
+
+const Server = require('../src/server')
 const server = new Server()
-server.start()
+server.start(program.port || 8545)
 
diff --git a/remix-simulator/package.json b/remix-simulator/package.json
index ad25583866..975ea75fb4 100644
--- a/remix-simulator/package.json
+++ b/remix-simulator/package.json
@@ -17,6 +17,7 @@
     "ansi-gray": "^0.1.1",
     "body-parser": "^1.18.2",
     "color-support": "^1.1.3",
+    "commander": "^2.19.0",
     "express": "^4.16.3",
     "express-ws": "^4.0.0",
     "fast-async": "^6.3.7",
diff --git a/remix-simulator/src/server.js b/remix-simulator/src/server.js
index ab18a5e9be..1f4c1753e4 100644
--- a/remix-simulator/src/server.js
+++ b/remix-simulator/src/server.js
@@ -11,7 +11,7 @@ class Server {
     this.provider = new Provider()
   }
 
-  start(host, port) {
+  start(port) {
     expressWs(app)
 
     app.use(bodyParser.urlencoded({extended: true}))
@@ -41,7 +41,7 @@ class Server {
       })
     })
 
-    app.listen(8545, () => log('Remix Simulator listening on port 8545!'))
+    app.listen(port, () => log('Remix Simulator listening on port ' + port))
   }
 
 }