Make bin/diviner generate with no arguments mean "generate everything"

Summary: Ref T988. This makes it easier to generate documentation.

Test Plan: Ran with and without `--book`. Examined CLI output.

Reviewers: chad, btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T988

Differential Revision: https://secure.phabricator.com/D8415

src/applications/diviner/workflow/DivinerAtomizeWorkflow.php

@@ -30,7 +30,7 @@ final class DivinerAtomizeWorkflow extends DivinerWorkflow {
   }
 
   public function execute(PhutilArgumentParser $args) {
-    $this->readBookConfiguration($args);
+    $this->readBookConfiguration($args->getArg('book'));
 
     $console = PhutilConsole::getConsole();
 

src/applications/diviner/workflow/DivinerGenerateWorkflow.php

@@ -38,7 +38,41 @@ final class DivinerGenerateWorkflow extends DivinerWorkflow {
   }
 
   public function execute(PhutilArgumentParser $args) {
-    $this->readBookConfiguration($args);
+    $book = $args->getArg('book');
+    if ($book) {
+      $books = array($book);
+    } else {
+      $cwd = getcwd();
+      $this->log(pht('FINDING DOCUMENTATION BOOKS'));
+      $books = id(new FileFinder($cwd))
+        ->withType('f')
+        ->withSuffix('book')
+        ->find();
+
+      if (!$books) {
+        throw new PhutilArgumentUsageException(
+          pht(
+            "There are no Diviner '.book' files anywhere beneath the ".
+            "current directory. Use '--book <book>' to specify a ".
+            "documentation book to generate."));
+      } else {
+        $this->log(pht('Found %s book(s).', new PhutilNumber(count($books))));
+      }
+    }
+
+    foreach ($books as $book) {
+      $short_name = basename($book);
+
+      $this->log(pht('Generating book "%s"...', $short_name));
+      $this->generateBook($book, $args);
+      $this->log(pht('Completed generation of "%s".', $short_name)."\n");
+    }
+  }
+
+  private function generateBook($book, PhutilArgumentParser $args) {
+    $this->atomCache = null;
+
+    $this->readBookConfiguration($book);
 
     if ($args->getArg('clean')) {
       $this->log(pht('CLEARING CACHES'));

src/applications/diviner/workflow/DivinerWorkflow.php

@@ -17,8 +17,7 @@ abstract class DivinerWorkflow extends PhabricatorManagementWorkflow {
     return $this->config;
   }
 
-  protected function readBookConfiguration(PhutilArgumentParser $args) {
+  protected function readBookConfiguration($book_path) {
-    $book_path = $args->getArg('book');
     if ($book_path === null) {
       throw new PhutilArgumentUsageException(
         "Specify a Diviner book configuration file with --book.");