Add help for $ phenomic and unknown commands

package.json

@@ -81,7 +81,7 @@
     "webpack-dev-middleware": "^1.6.1",
     "webpack-hot-middleware": "^2.12.2",
     "webpack-notifier": "^1.4.0",
-    "yargs": "^4.3.1"
+    "yargs": "^5.0.0"
   },
   "devDependencies": {
     "ava": "^0.16.0",

src/bin/phenomic.js

@@ -1,5 +1,6 @@
 import "babel-polyfill"
 import { join } from "path"
+import colors from "chalk"
 
 import setup from "./commands/setup/index.js"
 
@@ -68,4 +69,29 @@ yargs.command(
   runner
 )
 
+yargs.check((argv) => {
+  // requires at least 1 argument
+  // show help when type `$ phenomic`
+  // argv._ = [
+  //   nodePath,
+  //   pathToPhenomicScript,
+  //   input argvs
+  // ]
+  if (argv._.length < 3) {
+    throw new Error(
+      colors.bgRed(colors.white("ERROR")) +
+      colors.red(" You must specify command for Phenomic CLI")
+    )
+  }
+
+  // Unknown command
+  const currentCommand = argv._[2]
+  if ([ "start", "build", "setup" ].indexOf(currentCommand) < 0) {
+    throw new Error(
+      colors.bgRed(colors.white("ERROR")) +
+      colors.red(` Unknown command "${ currentCommand }"`)
+    )
+  }
+})
+
 yargs.parse(process.argv)

src/configurator/yargs.js

@@ -6,7 +6,8 @@ import definitions from "./definitions.js"
 
 yargs
   .version(() => version)
-  .help()
+  .usage("Usage: phenomic <command> [options]")
+  // .hep()
   .showHelpOnFail()
   .epilogue(
     "For more information about the configuration, " +
@@ -32,13 +33,6 @@ Object.keys(definitions).forEach((optName) => {
   if (option.description) {
     yargs.describe(optName, option.description)
   }
-
-  // made by hand for now, we might revisit option this later
-  // if (validators[optName]) {
-  //   yargs.check(() => {
-  //
-  //   })
-  // }
 })
 
 export default yargs