'arc liberate', convenience wrapper for various libphutil operations

Summary:
The story for creating and maintaining libphutil libraries and modules
is pretty terrible right now: you need to know a bunch of secret scripts and
dark magic. Provide 'arc liberate' which endeavors to always do the right thing
and put a library in the correct state.

Test Plan:
Ran liberate on libphutil, arcanist, phabricator; created new
libphutil libraries, added classes to them, liberated everything, introduced
errors etc and liberated that stuff, nothing was obviously broken in a terrible
way..?

Reviewed By: aran
Reviewers: jungejason, tuomaspelkonen, aran
CC: aran, epriestley
Differential Revision: 269

scripts/phutil_analyzer.php

@@ -33,6 +33,7 @@ $builtin = array(
     'print' => true,
     'exit'  => true,
     'die'   => true,
+    'phutil_load_library' => true,
   ),
   'interface' => array_fill_keys($builtin_interfaces, true),
 );

scripts/phutil_mapper.php

@@ -19,6 +19,16 @@
 
 require_once dirname(__FILE__).'/__init_script__.php';
 
+$liberate_mode = false;
+for ($ii = 0; $ii < $argc; $ii++) {
+  if ($argv[$ii] == '--find-paths-for-liberate') {
+    $liberate_mode = true;
+    unset($argv[$ii]);
+  }
+}
+$argv = array_values($argv);
+$argc = count($argv);
+
 if ($argc != 2) {
   $self = basename($argv[0]);
   echo "usage: {$self} <phutil_library_root>\n";
@@ -35,6 +45,10 @@ if (!@file_exists($root.'/__phutil_library_init__.php')) {
   throw new Exception("Provided path is not a phutil library.");
 }
 
+if ($liberate_mode) {
+  ob_start();
+}
+
 echo "Finding phutil modules...\n";
 $files = id(new FileFinder($root))
   ->withType('f')
@@ -81,18 +95,23 @@ if ($cache) {
 
 $specs = array();
 
-$futures = array();
+$need_update = array();
 foreach ($signatures as $module => $signature) {
   if (isset($signature_cache[$module]) &&
       $signature_cache[$module]['signature'] == $signature) {
     $specs[$module] = $signature_cache[$module];
   } else {
+    $need_update[$module] = true;
+  }
+}
+
+$futures = array();
+foreach ($need_update as $module => $ignored) {
   $futures[$module] = new ExecFuture(
     '%s %s',
     dirname(__FILE__).'/phutil_analyzer.php',
     $root.'/'.$module);
 }
-}
 
 if ($futures) {
   echo "Found ".count($specs)." modules in cache; ".
@@ -180,6 +199,12 @@ echo "Writing library map file...\n";
 
 Filesystem::writeFile($root.'/__phutil_library_map__.php', $map_file);
 
+if ($liberate_mode) {
+  ob_get_clean();
+  echo json_encode(array_keys($need_update))."\n";
+  return;
+}
+
 echo "Writing module cache...\n";
 
 Filesystem::writeFile(

src/__phutil_library_map__.php

@@ -36,6 +36,8 @@ phutil_register_library_map(array(
     'ArcanistGitAPI' => 'repository/api/git',
     'ArcanistGitHookPreReceiveWorkflow' => 'workflow/git-hook-pre-receive',
     'ArcanistHelpWorkflow' => 'workflow/help',
+    'ArcanistLiberateLintEngine' => 'lint/engine/liberate',
+    'ArcanistLiberateWorkflow' => 'workflow/liberate',
     'ArcanistLicenseLinter' => 'lint/linter/license',
     'ArcanistLintEngine' => 'lint/engine/base',
     'ArcanistLintJSONRenderer' => 'lint/renderer',
@@ -97,6 +99,8 @@ phutil_register_library_map(array(
     'ArcanistGitAPI' => 'ArcanistRepositoryAPI',
     'ArcanistGitHookPreReceiveWorkflow' => 'ArcanistBaseWorkflow',
     'ArcanistHelpWorkflow' => 'ArcanistBaseWorkflow',
+    'ArcanistLiberateLintEngine' => 'ArcanistLintEngine',
+    'ArcanistLiberateWorkflow' => 'ArcanistBaseWorkflow',
     'ArcanistLicenseLinter' => 'ArcanistLinter',
     'ArcanistLintWorkflow' => 'ArcanistBaseWorkflow',
     'ArcanistLinterTestCase' => 'ArcanistPhutilTestCase',

src/lint/engine/base/ArcanistLintEngine.php

@@ -182,7 +182,7 @@ abstract class ArcanistLintEngine {
         // through the lint messages and doing this load only if any of them
         // have original/replacement text or something like that.
         try {
-          $this->fileData[$path] = Filesystem::readFile($path);
+          $this->fileData[$path] = Filesystem::readFile($disk_path);
           $result->setData($this->fileData[$path]);
         } catch (FilesystemException $ex) {
           // Ignore this, it's noncritical that we access this data and it

src/lint/engine/liberate/ArcanistLiberateLintEngine.php

@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Lint engine which powers 'arc liberate'.
+ *
+ * @group linter
+ */
+class ArcanistLiberateLintEngine extends ArcanistLintEngine {
+
+  public function buildLinters() {
+    // We just run the module linter, 'arc liberate' is only interested in
+    // building __init__.php files.
+
+    $module_linter = new ArcanistPhutilModuleLinter();
+    foreach ($this->getPaths() as $path) {
+      $module_linter->addPath($path);
+    }
+
+    return array($module_linter);
+  }
+
+}

src/lint/engine/liberate/__init__.php

@@ -0,0 +1,13 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('arcanist', 'lint/engine/base');
+phutil_require_module('arcanist', 'lint/linter/phutilmodule');
+
+
+phutil_require_source('ArcanistLiberateLintEngine.php');

src/lint/linter/phutilmodule/ArcanistPhutilModuleLinter.php

@@ -159,7 +159,7 @@ class ArcanistPhutilModuleLinter extends ArcanistLinter {
     }
 
     $requirements = array();
-    foreach (Futures($futures) as $key => $future) {
+    foreach (Futures($futures)->limit(16) as $key => $future) {
       $requirements[$key] = $future->resolveJSON();
     }
 
@@ -203,7 +203,7 @@ class ArcanistPhutilModuleLinter extends ArcanistLinter {
       }
     }
 
-    foreach (Futures($futures) as $key => $future) {
+    foreach (Futures($futures)->limit(16) as $key => $future) {
       $dependencies[$key] = $future->resolveJSON();
     }
 
@@ -378,13 +378,17 @@ class ArcanistPhutilModuleLinter extends ArcanistLinter {
         $need_functions,
         $drop_modules);
       $init_path = $this->getModulePathOnDisk($key).'/__init__.php';
-      $try_path = Filesystem::readablePath($init_path);
-      if (Filesystem::pathExists($try_path)) {
+
+      $root = $this->getEngine()->getWorkingCopy()->getProjectRoot();
+      $try_path = Filesystem::readablePath($init_path, $root);
+      $full_path = Filesystem::resolvePath($try_path, $root);
+      if (Filesystem::pathExists($full_path)) {
         $init_path = $try_path;
-        $old_file = Filesystem::readFile($init_path);
+        $old_file = Filesystem::readFile($full_path);
       } else {
         $old_file = '';
       }
+
       $this->willLintPath($init_path);
       $message = $this->raiseLintAtOffset(
         null,

src/workflow/help/ArcanistHelpWorkflow.php

@@ -78,6 +78,9 @@ EOTEXT
         if ($argument == '*') {
           continue;
         }
+        if (!empty($spec['hide'])) {
+          continue;
+        }
         if (isset($spec['param'])) {
           if (isset($spec['short'])) {
             $optref[] = phutil_console_format(

src/workflow/liberate/ArcanistLiberateWorkflow.php

@@ -0,0 +1,336 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Create and update libphutil libraries.
+ *
+ * This workflow is unusual and involves reexecuting 'arc liberate' as a
+ * subprocess with "--remap" and "--verify". This is because there is no way
+ * to unload or reload a library, so every process is stuck with the library
+ * definition it had when it first loaded. This is normally fine, but
+ * problematic in this case because 'arc liberate' modifies library definitions.
+ *
+ * @group workflow
+ */
+class ArcanistLiberateWorkflow extends ArcanistBaseWorkflow {
+
+  public function getCommandHelp() {
+    return phutil_console_format(<<<EOTEXT
+      **liberate** [__path__]
+          Supports: libphutil
+          Create or update a libphutil library, generating required metadata
+          files like __init__.php.
+EOTEXT
+      );
+  }
+
+  public function getArguments() {
+    return array(
+      'all' => array(
+        'help' =>
+          "Drop the module cache before liberating. This will completely ".
+          "reanalyze the entire library. Thorough, but slow!",
+      ),
+      'force-update' => array(
+        'help' =>
+          "Force the library map to be updated, even in the presence of ".
+          "lint errors.",
+      ),
+      'remap' => array(
+        'hide' => true,
+        'help' =>
+          "Internal. Run the remap step of liberation. You do not need to ".
+          "run this unless you are debugging the workflow.",
+      ),
+      'verify' => array(
+        'hide' => true,
+        'help' =>
+          "Internal. Run the verify step of liberation. You do not need to ".
+          "run this unless you are debugging the workflow.",
+      ),
+      '*' => 'argv',
+    );
+  }
+
+  public function run() {
+    $argv = $this->getArgument('argv');
+    if (count($argv) > 1) {
+      throw new ArcanistUsageException(
+        "Provide only one path to 'arc liberate'. The path should be a ".
+        "directory where you want to create or update a libphutil library.");
+    } else if (count($argv) == 0) {
+      $path = getcwd();
+    } else {
+      $path = reset($argv);
+    }
+
+    $is_remap = $this->getArgument('remap');
+    $is_verify = $this->getArgument('verify');
+
+    $path = Filesystem::resolvePath($path);
+
+    if (Filesystem::pathExists($path) && is_dir($path)) {
+      $init = id(new FileFinder($path))
+        ->withPath('*/__phutil_library_init__.php')
+        ->find();
+    } else {
+      $init = null;
+    }
+
+    if ($init) {
+      if (count($init) > 1) {
+        throw new ArcanistUsageException(
+          "Specified directory contains more than one libphutil library. Use ".
+          "a more specific path.");
+      }
+      $path = Filesystem::resolvePath(dirname(reset($init)), $path);
+    } else {
+      $found = false;
+      foreach (Filesystem::walkToRoot($path) as $dir) {
+        if (Filesystem::pathExists($dir.'/__phutil_library_init__.php')) {
+          $path = $dir;
+          break;
+        }
+      }
+      if (!$found) {
+        echo "No library currently exists at that path...\n";
+        $this->liberateCreateDirectory($path);
+        $this->liberateCreateLibrary($path);
+      }
+    }
+
+    if ($this->getArgument('remap')) {
+      return $this->liberateRunRemap($path);
+    }
+
+    if ($this->getArgument('verify')) {
+      return $this->liberateRunVerify($path);
+    }
+
+    $readable = Filesystem::readablePath($path);
+    echo "Using library root at '{$readable}'...\n";
+
+    if ($this->getArgument('all')) {
+      echo "Dropping module cache...\n";
+      Filesystem::remove($path.'/.phutil_module_cache');
+    }
+
+    echo "Mapping library...\n";
+
+    // Force a rebuild of the library map before running lint. The remap
+    // operation will load the map before regenerating it, so if a class has
+    // been renamed (say, from OldClass to NewClass) this rebuild will
+    // cause the initial remap to see NewClass and correctly remove includes
+    // caused by use of OldClass.
+    $this->liberateGetChangedPaths($path);
+
+    $arc_bin = $this->getScriptPath('bin/arc');
+
+    do {
+      $future = new ExecFuture(
+        '%s liberate --remap -- %s',
+        $arc_bin,
+        $path);
+      $wrote = $future->resolveJSON();
+      foreach ($wrote as $wrote_path) {
+        echo "Updated '{$wrote_path}'...\n";
+      }
+    } while ($wrote);
+
+    echo "Verifying library...\n";
+
+    $err = 0;
+    $cmd = csprintf('%s liberate --verify -- %s', $arc_bin, $path);
+    passthru($cmd, $err);
+
+    $do_update = (!$err || $this->getArgument('force-update'));
+
+    if ($do_update) {
+      echo "Finalizing library map...\n";
+      execx('%s %s', $this->getPhutilMapperLocation(), $path);
+    }
+
+    if ($err) {
+      if ($do_update) {
+        echo phutil_console_format(
+          "<bg:yellow>**  WARNING  **</bg> Library update forced, but lint ".
+          "failures remain.\n");
+      } else {
+        echo phutil_console_format(
+          "<bg:red>**  UNRESOLVED LINT ERRORS  **</bg> This library has ".
+          "unresolved lint failures. The library map was not updated. Use ".
+          "--force-update to force an update.\n");
+      }
+    } else {
+      echo phutil_console_format(
+        "<bg:green>**  OKAY  **</bg> Library updated.\n");
+    }
+
+    return $err;
+  }
+
+  private function liberateLintModules($path, array $changed) {
+    $engine = $this->liberateBuildLintEngine($path, $changed);
+    if ($engine) {
+      return $engine->run();
+    } else {
+      return array();
+    }
+  }
+
+  private function liberateWritePatches(array $results) {
+    $wrote = array();
+
+    foreach ($results as $result) {
+      if ($result->isPatchable()) {
+        $patcher = ArcanistLintPatcher::newFromArcanistLintResult($result);
+        $patcher->writePatchToDisk();
+        $wrote[] = $result->getPath();
+      }
+    }
+
+    return $wrote;
+  }
+
+  private function liberateBuildLintEngine($path, array $changed) {
+    $lint_map = array();
+    foreach ($changed as $module) {
+      $module_path = $path.'/'.$module;
+      $files = Filesystem::listDirectory($module_path);
+      $lint_map[$module] = $files;
+    }
+
+    $working_copy = ArcanistWorkingCopyIdentity::newFromRootAndConfigFile(
+      $path,
+      json_encode(
+        array(
+          'project_id' => '__arcliberate__',
+        )),
+      'arc liberate');
+
+    $engine = new ArcanistLiberateLintEngine();
+    $engine->setWorkingCopy($working_copy);
+
+    $lint_paths = array();
+    foreach ($lint_map as $module => $files) {
+      foreach ($files as $file) {
+        $lint_paths[] = $module.'/'.$file;
+      }
+    }
+
+    if (!$lint_paths) {
+      return null;
+    }
+
+    $engine->setPaths($lint_paths);
+    $engine->setMinimumSeverity(ArcanistLintSeverity::SEVERITY_ERROR);
+
+    return $engine;
+  }
+
+
+  private function liberateCreateDirectory($path) {
+    if (Filesystem::pathExists($path)) {
+      if (!is_dir($path)) {
+        throw new ArcanistUsageException(
+          "Provide a directory to create or update a libphutil library in.");
+      }
+      return;
+    }
+
+    echo "The directory '{$path}' does not exist.";
+    if (!phutil_console_confirm('Do you want to create it?')) {
+      throw new ArcanistUsageException("Cancelled.");
+    }
+
+    execx('mkdir -p %s', $path);
+  }
+
+  private function liberateCreateLibrary($path) {
+    $init_path = $path.'/__phutil_library_init__.php';
+    if (Filesystem::pathExists($init_path)) {
+      return;
+    }
+
+    echo "Creating new libphutil library in '{$path}'.\n";
+    echo "Choose a name for the new library.\n";
+    do {
+      $name = phutil_console_prompt('What do you want to name this library?');
+      if (preg_match('/^[a-z]+$/', $name)) {
+        break;
+      } else {
+        echo "Library name should contain only lowercase letters.\n";
+      }
+    } while (true);
+
+    $template =
+      "<?php\n\n".
+      "phutil_register_library('{$name}', __FILE__);\n";
+
+    echo "Writing '__phutil_library_init__.php' to '{$init_path}'...\n";
+    Filesystem::writeFile($init_path, $template);
+  }
+
+  private function liberateGetChangedPaths($path) {
+    $mapper = $this->getPhutilMapperLocation();
+    $future = new ExecFuture('%s %s --find-paths-for-liberate', $mapper, $path);
+    return $future->resolveJSON();
+  }
+
+  private function getScriptPath($script) {
+    $root = dirname(phutil_get_library_root('arcanist'));
+    return $root.'/'.$script;
+  }
+
+  private function getPhutilMapperLocation() {
+    return $this->getScriptPath('scripts/phutil_mapper.php');
+  }
+
+  private function liberateRunRemap($path) {
+    phutil_load_library($path);
+
+    $paths = $this->liberateGetChangedPaths($path);
+    $results = $this->liberateLintModules($path, $paths);
+    $wrote = $this->liberateWritePatches($results);
+
+    echo json_encode($wrote, true);
+
+    return 0;
+  }
+
+  private function liberateRunVerify($path) {
+    phutil_load_library($path);
+
+    $paths = $this->liberateGetChangedPaths($path);
+    $results = $this->liberateLintModules($path, $paths);
+
+    $renderer = new ArcanistLintRenderer();
+
+    $unresolved = false;
+    foreach ($results as $result) {
+      foreach ($result->getMessages() as $message) {
+        echo $renderer->renderLintResult($result);
+        $unresolved = true;
+        break;
+      }
+    }
+
+    return (int)$unresolved;
+  }
+
+}

src/workflow/liberate/__init__.php

@@ -0,0 +1,26 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('arcanist', 'exception/usage');
+phutil_require_module('arcanist', 'lint/engine/liberate');
+phutil_require_module('arcanist', 'lint/patcher');
+phutil_require_module('arcanist', 'lint/renderer');
+phutil_require_module('arcanist', 'lint/severity');
+phutil_require_module('arcanist', 'workflow/base');
+phutil_require_module('arcanist', 'workingcopyidentity');
+
+phutil_require_module('phutil', 'console');
+phutil_require_module('phutil', 'filesystem');
+phutil_require_module('phutil', 'filesystem/filefinder');
+phutil_require_module('phutil', 'future/exec');
+phutil_require_module('phutil', 'moduleutils');
+phutil_require_module('phutil', 'utils');
+phutil_require_module('phutil', 'xsprintf/csprintf');
+
+
+phutil_require_source('ArcanistLiberateWorkflow.php');