1 files changed, 82 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/runtime/commands/SkylarkCommand.java b/src/main/java/com/google/devtools/build/lib/runtime/commands/SkylarkCommand.java
new file mode 100644
index 0000000000..70082ef8dd
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/runtime/commands/SkylarkCommand.java
@@ -0,0 +1,82 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// 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.
+
+package com.google.devtools.build.lib.runtime.commands;
+
+import com.google.devtools.build.docgen.SkylarkDocumentationProcessor;
+import com.google.devtools.build.lib.events.Event;
+import com.google.devtools.build.lib.events.Reporter;
+import com.google.devtools.build.lib.runtime.BlazeCommand;
+import com.google.devtools.build.lib.runtime.BlazeCommandDispatcher.ShutdownBlazeServerException;
+import com.google.devtools.build.lib.runtime.BlazeRuntime;
+import com.google.devtools.build.lib.runtime.Command;
+import com.google.devtools.build.lib.util.ExitCode;
+import com.google.devtools.build.lib.util.io.OutErr;
+import com.google.devtools.common.options.OptionsParser;
+import com.google.devtools.common.options.OptionsProvider;
+
+import java.util.Map;
+
+/**
+ * The 'doc_ext' command, which prints the extension API doc.
+ */
+@Command(name = "doc_ext",
+allowResidue = true,
+mustRunInWorkspace = false,
+shortDescription = "Prints help for commands, or the index.",
+help = "resource:skylark.txt")
+public final class SkylarkCommand implements BlazeCommand {
+
+  @Override
+  public ExitCode exec(BlazeRuntime runtime, OptionsProvider options)
+      throws ShutdownBlazeServerException {
+    OutErr outErr = runtime.getReporter().getOutErr();
+    if (options.getResidue().isEmpty()) {
+      printTopLevelAPIDoc(outErr);
+      return ExitCode.SUCCESS;
+    }
+    if (options.getResidue().size() != 1) {
+      runtime.getReporter().handle(Event.error("Cannot specify more than one parameters"));
+      return ExitCode.COMMAND_LINE_ERROR;
+    }
+    return printAPIDoc(options.getResidue().get(0), outErr, runtime.getReporter());
+  }
+
+  private ExitCode printAPIDoc(String param, OutErr outErr, Reporter reporter) {
+    String params[] = param.split("\\.");
+    if (params.length > 2) {
+      reporter.handle(Event.error("Identifier not found: " + param));
+      return ExitCode.COMMAND_LINE_ERROR;
+    }
+    SkylarkDocumentationProcessor processor = new SkylarkDocumentationProcessor();
+    String doc = processor.getCommandLineAPIDoc(params);
+    if (doc == null) {
+      reporter.handle(Event.error("Identifier not found: " + param));
+      return ExitCode.COMMAND_LINE_ERROR;
+    }
+    outErr.printOut(doc);
+    return ExitCode.SUCCESS;
+  }
+
+  private void printTopLevelAPIDoc(OutErr outErr) {
+    SkylarkDocumentationProcessor processor = new SkylarkDocumentationProcessor();
+    outErr.printOut("Top level language modules, methods and objects:\n\n");
+    for (Map.Entry<String, String> entry : processor.collectTopLevelModules().entrySet()) {
+      outErr.printOut(entry.getKey() + ": " + entry.getValue());
+    }
+  }
+
+  @Override
+  public void editOptions(BlazeRuntime runtime, OptionsParser optionsParser) {}
+}