Fix help and error messages.

tools/gn/function_exec_script.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/process/kill.h"
 #include "base/process/launch.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 227 matching lines @@
     "\n"
     "  exec_script(filename, arguments, input_conversion,\n"
     "              [file_dependencies])\n"
     "\n"
     "  Runs the given script, returning the stdout of the script. The build\n"
     "  generation will fail if the script does not exist or returns a nonzero\n"
     "  exit code.\n"
     "\n"
     "  The current directory when executing the script will be the root\n"
     "  build directory. If you are passing file names, you will want to use\n"
-    "  the to_build_dir() function to make file names relative to this\n"
-    "  path (see \"gn help to_build_dir\").\n"
+    "  the rebase_path() function to make file names relative to this\n"
+    "  path (see \"gn help rebase_path\").\n"
     "\n"
     "Arguments:\n"
     "\n"
     "  filename:\n"
     "      File name of python script to execute. Non-absolute names will\n"
     "      be treated as relative to the current build file.\n"
     "\n"
     "  arguments:\n"
     "      A list of strings to be passed to the script as arguments.\n"
     "\n"
     "  input_conversion:\n"
     "      Controls how the file is read and parsed.\n"
     "      See \"gn help input_conversion\".\n"
     "\n"
     "  dependencies:\n"
     "      (Optional) A list of files that this script reads or otherwise\n"
     "      depends on. These dependencies will be added to the build result\n"
     "      such that if any of them change, the build will be regenerated and\n"
     "      the script will be re-run.\n"
     "\n"
     "      The script itself will be an implicit dependency so you do not\n"
     "      need to list it.\n"
     "\n"
     "Example:\n"
     "\n"
     "  all_lines = exec_script(\"myscript.py\", [some_input], \"list lines\",\n"
-    "                          [ to_build_dir(\"data_file.txt\") ])\n";
+    "                          [ rebase_path(\"data_file.txt\", \".\","
+    "                                        root_build_dir) ])\n";
 
 Value RunExecScript(Scope* scope,
                     const FunctionCallNode* function,
                     const std::vector<Value>& args,
                     Err* err) {
   if (args.size() != 3 && args.size() != 4) {
-    *err = Err(function->function(), "Wrong number of args to write_file",
+    *err = Err(function->function(), "Wrong number of arguments to exec_script",
                "I expected three or four arguments.");
     return Value();
   }
 
   const Settings* settings = scope->settings();
   const BuildSettings* build_settings = settings->build_settings();
   const SourceDir& cur_dir = scope->GetSourceDir();
 
   // Find the python script to run.
   if (!args[0].VerifyTypeIs(Value::STRING, err))
@@ skipping 96 matching lines @@
       msg += ".";
     *err = Err(function->function(), "Script returned non-zero exit code.",
                msg);
     return Value();
   }
 
   return ConvertInputToValue(output, function, args[2], err);
 }
 
 }  // namespace functions