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	diff --git a/src/applications/diviner/workflow/DivinerGenerateWorkflow.php b/src/applications/diviner/workflow/DivinerGenerateWorkflow.php
	index 78f43a826f..d448de69c0 100644
	--- a/src/applications/diviner/workflow/DivinerGenerateWorkflow.php
	+++ b/src/applications/diviner/workflow/DivinerGenerateWorkflow.php
	@@ -1,587 +1,588 @@
	<?php

	final class DivinerGenerateWorkflow extends DivinerWorkflow {

	private $atomCache;

	protected function didConstruct() {
	$this
	->setName('generate')
	->setSynopsis(pht('Generate documentation.'))
	->setArguments(
	array(
	array(
	'name' => 'clean',
	'help' => pht('Clear the caches before generating documentation.'),
	),
	array(
	'name' => 'book',
	'param' => 'path',
	'help' => pht('Path to a Diviner book configuration.'),
	),
	array(
	'name' => 'publisher',
	'param' => 'class',
	'help' => pht('Specify a subclass of %s.', 'DivinerPublisher'),
	'default' => 'DivinerLivePublisher',
	),
	array(
	'name' => 'repository',
	'param' => 'callsign',
	'help' => pht('Repository that the documentation belongs to.'),
	),
	));
	}

	protected function getAtomCache() {
	if (!$this->atomCache) {
	$book_root = $this->getConfig('root');
	$book_name = $this->getConfig('name');
	$cache_directory = $book_root.'/.divinercache/'.$book_name;
	$this->atomCache = new DivinerAtomCache($cache_directory);
	}
	return $this->atomCache;
	}

	protected function log($message) {
	$console = PhutilConsole::getConsole();
	$console->writeErr($message."\n");
	}

	public function execute(PhutilArgumentParser $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 '%s' files anywhere beneath the current ".
	"directory. Use '%s' to specify a documentation book to generate.",
	'.book',
	'--book <book>'));
	} 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'));
	$this->getAtomCache()->delete();
	$this->log(pht('Done.')."\n");
	}

	// The major challenge of documentation generation is one of dependency
	// management. When regenerating documentation, we want to do the smallest
	// amount of work we can, so that regenerating documentation after minor
	// changes is quick.
	//
	// = Atom Cache =
	//
	// In the first stage, we find all the direct changes to source code since
	// the last run. This stage relies on two data structures:
	//
	// - File Hash Map: `map<file_hash, node_hash>`
	// - Atom Map: `map<node_hash, true>`
	//
	// First, we hash all the source files in the project to detect any which
	// have changed since the previous run (i.e., their hash is not present in
	// the File Hash Map). If a file's content hash appears in the map, it has
	// not changed, so we don't need to reparse it.
	//
	// We break the contents of each file into "atoms", which represent a unit
	// of source code (like a function, method, class or file). Each atom has a
	// "node hash" based on the content of the atom: if a function definition
	// changes, the node hash of the atom changes too. The primary output of
	// the atom cache is a list of node hashes which exist in the project. This
	// is the Atom Map. The node hash depends only on the definition of the atom
	// and the atomizer implementation. It ends with an "N", for "node".
	//
	// (We need the Atom Map in addition to the File Hash Map because each file
	// may have several atoms in it (e.g., multiple functions, or a class and
	// its methods). The File Hash Map contains an exhaustive list of all atoms
	// with type "file", but not child atoms of those top-level atoms.)
	//
	// = Graph Cache =
	//
	// We now know which atoms exist, and can compare the Atom Map to some
	// existing cache to figure out what has changed. However, this isn't
	// sufficient to figure out which documentation actually needs to be
	// regenerated, because atoms depend on other atoms. For example, if `B
	// extends A` and the definition for `A` changes, we need to regenerate the
	// documentation in `B`. Similarly, if `X` links to `Y` and `Y` changes, we
	// should regenerate `X`. (In both these cases, the documentation for the
	// connected atom may not actually change, but in some cases it will, and
	// the extra work we need to do is generally very small compared to the
	// size of the project.)
	//
	// To figure out which other nodes have changed, we compute a "graph hash"
	// for each node. This hash combines the "node hash" with the node hashes
	// of connected nodes. Our primary output is a list of graph hashes, which
	// a documentation generator can use to easily determine what work needs
	// to be done by comparing the list with a list of cached graph hashes,
	// then generating documentation for new hashes and deleting documentation
	// for missing hashes. The graph hash ends with a "G", for "graph".
	//
	// In this stage, we rely on three data structures:
	//
	// - Symbol Map: `map<node_hash, symbol_hash>`
	// - Edge Map: `map<node_hash, list<symbol_hash>>`
	// - Graph Map: `map<node_hash, graph_hash>`
	//
	// Calculating the graph hash requires several steps, because we need to
	// figure out which nodes an atom is attached to. The atom contains symbolic
	// references to other nodes by name (e.g., `extends SomeClass`) in the form
	// of @{class:DivinerAtomRefs}. We can also build a symbolic reference for
	// any atom from the atom itself. Each @{class:DivinerAtomRef} generates a
	// symbol hash, which ends with an "S", for "symbol".
	//
	// First, we update the symbol map. We remove (and mark dirty) any symbols
	// associated with node hashes which no longer exist (e.g., old/dead nodes).
	// Second, we add (and mark dirty) any symbols associated with new nodes.
	// We also add edges defined by new nodes to the graph.
	//
	// We initialize a list of dirty nodes to the list of new nodes, then find
	// all nodes connected to dirty symbols and add them to the dirty node list.
	// This list now contains every node with a new or changed graph hash.
	//
	// We walk the dirty list and compute the new graph hashes, adding them
	// to the graph hash map. This Graph Map can then be passed to an actual
	// documentation generator, which can compare the graph hashes to a list
	// of already-generated graph hashes and easily assess which documents need
	// to be regenerated and which can be deleted.

	$this->buildAtomCache();
	$this->buildGraphCache();

	$publisher_class = $args->getArg('publisher');
	$symbols = id(new PhutilSymbolLoader())
	->setName($publisher_class)
	->setConcreteOnly(true)
	->setAncestorClass('DivinerPublisher')
	->selectAndLoadSymbols();

	if (!$symbols) {
	throw new PhutilArgumentUsageException(
	pht(
	"Publisher class '%s' must be a concrete subclass of %s.",
	$publisher_class,
	'DivinerPublisher'));
	}
	$publisher = newv($publisher_class, array());

	$callsign = $args->getArg('repository');
	$repository = null;
	if ($callsign) {
	$repository = id(new PhabricatorRepositoryQuery())
	->setViewer(PhabricatorUser::getOmnipotentUser())
	->withCallsigns(array($callsign))
	->executeOne();

	if (!$repository) {
	throw new PhutilArgumentUsageException(
	pht(
	"Repository '%s' does not exist.",
	$callsign));
	}

	$publisher->setRepositoryPHID($repository->getPHID());
	}

	$this->publishDocumentation($args->getArg('clean'), $publisher);
	}


	/* -( Atom Cache )--------------------------------------------------------- */


	private function buildAtomCache() {
	$this->log(pht('BUILDING ATOM CACHE'));

	$file_hashes = $this->findFilesInProject();
	$this->log(
	pht(
	'Found %s file(s) in project.',
	new PhutilNumber(count($file_hashes))));

	$this->deleteDeadAtoms($file_hashes);
	$atomize = $this->getFilesToAtomize($file_hashes);
	$this->log(
	pht(
	'Found %s unatomized, uncached file(s).',
	new PhutilNumber(count($atomize))));

	$file_atomizers = $this->getAtomizersForFiles($atomize);
	$this->log(
	pht(
	'Found %s file(s) to atomize.',
	new PhutilNumber(count($file_atomizers))));

	$futures = $this->buildAtomizerFutures($file_atomizers);
	$this->log(
	pht(
	'Atomizing %s file(s).',
	new PhutilNumber(count($file_atomizers))));

	if ($futures) {
	$this->resolveAtomizerFutures($futures, $file_hashes);
	$this->log(pht('Atomization complete.'));
	} else {
	$this->log(pht('Atom cache is up to date, no files to atomize.'));
	}

	$this->log(pht('Writing atom cache.'));
	$this->getAtomCache()->saveAtoms();
	$this->log(pht('Done.')."\n");
	}

	private function getAtomizersForFiles(array $files) {
	$rules = $this->getRules();
	$exclude = $this->getExclude();
	$atomizers = array();

	foreach ($files as $file) {
	foreach ($exclude as $pattern) {
	if (preg_match($pattern, $file)) {
	continue 2;
	}
	}

	foreach ($rules as $rule => $atomizer) {
	$ok = preg_match($rule, $file);
	if ($ok === false) {
	throw new Exception(
	pht("Rule '%s' is not a valid regular expression.", $rule));
	}
	if ($ok) {
	$atomizers[$file] = $atomizer;
	continue;
	}
	}
	}

	return $atomizers;
	}

	private function getRules() {
	return $this->getConfig('rules', array(
	'/\\.diviner$/' => 'DivinerArticleAtomizer',
	'/\\.php$/' => 'DivinerPHPAtomizer',
	));
	}

	private function getExclude() {
	$exclude = (array)$this->getConfig('exclude', array());
	return $exclude;
	}

	private function findFilesInProject() {
	$raw_hashes = id(new FileFinder($this->getConfig('root')))
	->excludePath('/.')
	->withType('f')
	->setGenerateChecksums(true)
	->find();

	$version = $this->getDivinerAtomWorldVersion();

	$file_hashes = array();
	foreach ($raw_hashes as $file => $md5_hash) {
	$rel_file = Filesystem::readablePath($file, $this->getConfig('root'));
	// We want the hash to change if the file moves or Diviner gets updated,
	// not just if the file content changes. Derive a hash from everything
	// we care about.
	$file_hashes[$rel_file] = md5("{$rel_file}\0{$md5_hash}\0{$version}").'F';
	}

	return $file_hashes;
	}

	private function deleteDeadAtoms(array $file_hashes) {
	$atom_cache = $this->getAtomCache();

	$hash_to_file = array_flip($file_hashes);
	foreach ($atom_cache->getFileHashMap() as $hash => $atom) {
	if (empty($hash_to_file[$hash])) {
	$atom_cache->deleteFileHash($hash);
	}
	}
	}

	private function getFilesToAtomize(array $file_hashes) {
	$atom_cache = $this->getAtomCache();

	$atomize = array();
	foreach ($file_hashes as $file => $hash) {
	if (!$atom_cache->fileHashExists($hash)) {
	$atomize[] = $file;
	}
	}

	return $atomize;
	}

	private function buildAtomizerFutures(array $file_atomizers) {
	$atomizers = array();
	foreach ($file_atomizers as $file => $atomizer) {
	$atomizers[$atomizer][] = $file;
	}

	$root = dirname(phutil_get_library_root('phabricator'));
	$config_root = $this->getConfig('root');

	$bar = id(new PhutilConsoleProgressBar())
	->setTotal(count($file_atomizers));

	$futures = array();
	foreach ($atomizers as $class => $files) {
	foreach (array_chunk($files, 32) as $chunk) {
	$future = new ExecFuture(
	'%s atomize --ugly --book %s --atomizer %s -- %Ls',
	$root.'/bin/diviner',
	$this->getBookConfigPath(),
	$class,
	$chunk);
	$future->setCWD($config_root);

	$futures[] = $future;

	$bar->update(count($chunk));
	}
	}

	$bar->done();

	return $futures;
	}

	private function resolveAtomizerFutures(array $futures, array $file_hashes) {
	assert_instances_of($futures, 'Future');

	$atom_cache = $this->getAtomCache();
	$bar = id(new PhutilConsoleProgressBar())
	->setTotal(count($futures));
	$futures = id(new FutureIterator($futures))
	->limit(4);

	foreach ($futures as $key => $future) {
	try {
	$atoms = $future->resolveJSON();

	foreach ($atoms as $atom) {
	if ($atom['type'] == DivinerAtom::TYPE_FILE) {
	$file_hash = $file_hashes[$atom['file']];
	$atom_cache->addFileHash($file_hash, $atom['hash']);
	}
	$atom_cache->addAtom($atom);
	}
	} catch (Exception $e) {
	phlog($e);
	}

	$bar->update(1);
	}
	$bar->done();
	}

	/**
	* Get a global version number, which changes whenever any atom or atomizer
	* implementation changes in a way which is not backward-compatible.
	*/
	private function getDivinerAtomWorldVersion() {
	$version = array();
	$version['atom'] = DivinerAtom::getAtomSerializationVersion();
	$version['rules'] = $this->getRules();

	$atomizers = id(new PhutilClassMapQuery())
	->setAncestorClass('DivinerAtomizer')
	->execute();

	$atomizer_versions = array();
	foreach ($atomizers as $atomizer) {
	- $atomizer_versions[$atomizer['name']] = call_user_func(
	+ $name = get_class($atomizer);
	+ $atomizer_versions[$name] = call_user_func(
	array(
	- $atomizer['name'],
	+ $name,
	'getAtomizerVersion',
	));
	}

	ksort($atomizer_versions);
	$version['atomizers'] = $atomizer_versions;

	return md5(serialize($version));
	}


	/* -( Graph Cache )-------------------------------------------------------- */


	private function buildGraphCache() {
	$this->log(pht('BUILDING GRAPH CACHE'));

	$atom_cache = $this->getAtomCache();
	$symbol_map = $atom_cache->getSymbolMap();
	$atoms = $atom_cache->getAtomMap();

	$dirty_symbols = array();
	$dirty_nhashes = array();

	$del_atoms = array_diff_key($symbol_map, $atoms);
	$this->log(
	pht(
	'Found %s obsolete atom(s) in graph.',
	new PhutilNumber(count($del_atoms))));

	foreach ($del_atoms as $nhash => $shash) {
	$atom_cache->deleteSymbol($nhash);
	$dirty_symbols[$shash] = true;

	$atom_cache->deleteEdges($nhash);
	$atom_cache->deleteGraph($nhash);
	}

	$new_atoms = array_diff_key($atoms, $symbol_map);
	$this->log(
	pht(
	'Found %s new atom(s) in graph.',
	new PhutilNumber(count($new_atoms))));

	foreach ($new_atoms as $nhash => $ignored) {
	$shash = $this->computeSymbolHash($nhash);
	$atom_cache->addSymbol($nhash, $shash);
	$dirty_symbols[$shash] = true;

	$atom_cache->addEdges($nhash, $this->getEdges($nhash));

	$dirty_nhashes[$nhash] = true;
	}

	$this->log(pht('Propagating changes through the graph.'));

	// Find all the nodes which point at a dirty node, and dirty them. Then
	// find all the nodes which point at those nodes and dirty them, and so
	// on. (This is slightly overkill since we probably don't need to propagate
	// dirtiness across documentation "links" between symbols, but we do want
	// to propagate it across "extends", and we suffer only a little bit of
	// collateral damage by over-dirtying as long as the documentation isn't
	// too well-connected.)

	$symbol_stack = array_keys($dirty_symbols);
	while ($symbol_stack) {
	$symbol_hash = array_pop($symbol_stack);

	foreach ($atom_cache->getEdgesWithDestination($symbol_hash) as $edge) {
	$dirty_nhashes[$edge] = true;
	$src_hash = $this->computeSymbolHash($edge);
	if (empty($dirty_symbols[$src_hash])) {
	$dirty_symbols[$src_hash] = true;
	$symbol_stack[] = $src_hash;
	}
	}
	}

	$this->log(
	pht(
	'Found %s affected atoms.',
	new PhutilNumber(count($dirty_nhashes))));

	foreach ($dirty_nhashes as $nhash => $ignored) {
	$atom_cache->addGraph($nhash, $this->computeGraphHash($nhash));
	}

	$this->log(pht('Writing graph cache.'));

	$atom_cache->saveGraph();
	$atom_cache->saveEdges();
	$atom_cache->saveSymbols();

	$this->log(pht('Done.')."\n");
	}

	private function computeSymbolHash($node_hash) {
	$atom_cache = $this->getAtomCache();
	$atom = $atom_cache->getAtom($node_hash);

	if (!$atom) {
	throw new Exception(
	pht("No such atom with node hash '%s'!", $node_hash));
	}

	$ref = DivinerAtomRef::newFromDictionary($atom['ref']);
	return $ref->toHash();
	}

	private function getEdges($node_hash) {
	$atom_cache = $this->getAtomCache();
	$atom = $atom_cache->getAtom($node_hash);

	$refs = array();

	// Make the atom depend on its own symbol, so that all atoms with the same
	// symbol are dirtied (e.g., if a codebase defines the function `f()`
	// several times, all of them should be dirtied when one is dirtied).
	$refs[DivinerAtomRef::newFromDictionary($atom)->toHash()] = true;

	foreach (array_merge($atom['extends'], $atom['links']) as $ref_dict) {
	$ref = DivinerAtomRef::newFromDictionary($ref_dict);
	if ($ref->getBook() == $atom['book']) {
	$refs[$ref->toHash()] = true;
	}
	}

	return array_keys($refs);
	}

	private function computeGraphHash($node_hash) {
	$atom_cache = $this->getAtomCache();
	$atom = $atom_cache->getAtom($node_hash);

	$edges = $this->getEdges($node_hash);
	sort($edges);

	$inputs = array(
	'atomHash' => $atom['hash'],
	'edges' => $edges,
	);

	return md5(serialize($inputs)).'G';
	}

	private function publishDocumentation($clean, DivinerPublisher $publisher) {
	$atom_cache = $this->getAtomCache();
	$graph_map = $atom_cache->getGraphMap();

	$this->log(pht('PUBLISHING DOCUMENTATION'));

	$publisher
	->setDropCaches($clean)
	->setConfig($this->getAllConfig())
	->setAtomCache($atom_cache)
	->setRenderer(new DivinerDefaultRenderer())
	->publishAtoms(array_values($graph_map));

	$this->log(pht('Done.'));
	}

	}

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