tools/gn/function_write_file.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <iostream>
   6 #include <sstream>
   7
   8 #include "base/file_util.h"
   9 #include "base/strings/string_split.h"
  10 #include "base/strings/string_util.h"
  11 #include "tools/gn/err.h"
  12 #include "tools/gn/filesystem_utils.h"
  13 #include "tools/gn/functions.h"
  14 #include "tools/gn/input_file.h"
  15 #include "tools/gn/parse_tree.h"
  16 #include "tools/gn/scheduler.h"
  17
  18 namespace functions {
  19
  20 const char kWriteFile[] = "write_file";
  21 const char kWriteFile_Help[] =
  22     "write_file: Write a file to disk.\n"
  23     "\n"
  24     "  write_file(filename, data)\n"
  25     "\n"
  26     "  If data is a list, the list will be written one-item-per-line with no\n"
  27     "  quoting or brackets.\n"
  28     "\n"
  29     "  TODO(brettw) we probably need an optional third argument to control\n"
  30     "  list formatting.\n"
  31     "\n"
  32     "Arguments\n"
  33     "\n"
  34     "  filename\n"
  35     "      Filename to write. This must be within the output directory.\n"
  36     "\n"
  37     "  data:\n"
  38     "      The list or string to write.\n";
  39
  40 Value RunWriteFile(Scope* scope,
  41                    const FunctionCallNode* function,
  42                    const std::vector<Value>& args,
  43                    Err* err) {
  44   if (args.size() != 2) {
  45     *err = Err(function->function(), "Wrong number of arguments to write_file",
  46                "I expected two arguments.");
  47     return Value();
  48   }
  49
  50   // Compute the file name and make sure it's in the output dir.
  51   if (!args[0].VerifyTypeIs(Value::STRING, err))
  52     return Value();
  53   const SourceDir& cur_dir = scope->GetSourceDir();
  54   SourceFile source_file = cur_dir.ResolveRelativeFile(args[0].string_value());
  55   if (!EnsureStringIsInOutputDir(
  56           scope->settings()->build_settings()->build_dir(),
  57           source_file.value(), args[0], err))
  58     return Value();
  59
  60   // Compute output.
  61   std::ostringstream contents;
  62   if (args[1].type() == Value::LIST) {
  63     const std::vector<Value>& list = args[1].list_value();
  64     for (size_t i = 0; i < list.size(); i++)
  65       contents << list[i].ToString(false) << std::endl;
  66   } else {
  67     contents << args[1].ToString(false);
  68   }
  69
  70   // Write file, creating the directory if necessary.
  71   base::FilePath file_path =
  72       scope->settings()->build_settings()->GetFullPath(source_file);
  73   const std::string& contents_string = contents.str();
  74   if (!base::CreateDirectory(file_path.DirName())) {
  75     *err = Err(function->function(), "Unable to create directory.",
  76                "I was using \"" + FilePathToUTF8(file_path.DirName()) + "\".");
  77     return Value();
  78   }
  79   int int_size = static_cast<int>(contents_string.size());
  80   if (base::WriteFile(file_path, contents_string.c_str(), int_size)
  81       != int_size) {
  82     *err = Err(function->function(), "Unable to write file.",
  83                "I was writing \"" + FilePathToUTF8(file_path) + "\".");
  84     return Value();
  85   }
  86   return Value();
  87 }
  88
  89 }  // namespace functions