feat: show help when no arguments are provided (#160)

* feat: show help when no arguments are provided

* fix: add unknown command info back

* chore: visual adjustments

packages/cli/src/cliEntry.js

@@ -70,16 +70,16 @@ function printHelpInformation() {
 }
 
 function printUnknownCommand(cmdName) {
-  logger.error(
-    [
-      cmdName
-        ? `Unrecognized command "${cmdName}".`
-        : "You didn't pass any command.",
-      `Run ${chalk.white(
+  if (cmdName) {
+    logger.error(`Unrecognized command "${chalk.bold(cmdName)}".`);
+    logger.info(
+      `Run ${chalk.bold(
         '"react-native --help"'
-      )} to see list of all available commands.`,
-    ].join(' ')
-  );
+      )} to see a list of all available commands.`
+    );
+  } else {
+    commander.outputHelp();
+  }
 }
 
 const addCommand = (command: CommandT, ctx: ContextT) => {

packages/global-cli/index.js

@@ -114,7 +114,7 @@ const commands = options._;
 if (cli) {
   cli.run();
 } else {
-  if (options._.length === 0 && (options.h || options.help)) {
+  if (options._.length === 0 && (options.h || options.help) || commands.length === 0) {
     console.log(
       [
         '',
@@ -136,13 +136,6 @@ if (cli) {
     process.exit(0);
   }
 
-  if (commands.length === 0) {
-    console.error(
-      'You did not pass any commands, run `react-native --help` to see a list of all available commands.'
-    );
-    process.exit(1);
-  }
-
   switch (commands[0]) {
     case 'init':
       if (!commands[1]) {