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104 lines
3.4 KiB
C++
104 lines
3.4 KiB
C++
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <iostream>
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#include <sstream>
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#include "base/files/file_util.h"
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#include "base/strings/string_split.h"
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#include "base/strings/string_util.h"
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#include "base/strings/utf_string_conversions.h"
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#include "build/build_config.h"
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#include "tools/gn/err.h"
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#include "tools/gn/filesystem_utils.h"
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#include "tools/gn/functions.h"
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#include "tools/gn/input_file.h"
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#include "tools/gn/parse_tree.h"
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#include "tools/gn/scheduler.h"
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namespace functions {
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const char kWriteFile[] = "write_file";
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const char kWriteFile_HelpShort[] =
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"write_file: Write a file to disk.";
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const char kWriteFile_Help[] =
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R"(write_file: Write a file to disk.
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write_file(filename, data)
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If data is a list, the list will be written one-item-per-line with no quoting
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or brackets.
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If the file exists and the contents are identical to that being written, the
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file will not be updated. This will prevent unnecessary rebuilds of targets
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that depend on this file.
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One use for write_file is to write a list of inputs to an script that might
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be too long for the command line. However, it is preferrable to use response
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files for this purpose. See "gn help response_file_contents".
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TODO(brettw) we probably need an optional third argument to control list
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formatting.
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Arguments
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filename
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Filename to write. This must be within the output directory.
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data
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The list or string to write.
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)";
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Value RunWriteFile(Scope* scope,
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const FunctionCallNode* function,
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const std::vector<Value>& args,
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Err* err) {
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if (args.size() != 2) {
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*err = Err(function->function(), "Wrong number of arguments to write_file",
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"I expected two arguments.");
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return Value();
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}
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// Compute the file name and make sure it's in the output dir.
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const SourceDir& cur_dir = scope->GetSourceDir();
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SourceFile source_file = cur_dir.ResolveRelativeFile(args[0], err,
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scope->settings()->build_settings()->root_path_utf8());
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if (err->has_error())
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return Value();
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if (!EnsureStringIsInOutputDir(
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scope->settings()->build_settings()->build_dir(),
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source_file.value(), args[0].origin(), err))
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return Value();
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g_scheduler->AddWrittenFile(source_file); // Track that we wrote this file.
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// Track how to recreate this file, since we write it a gen time.
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// Note this is a hack since the correct output is not a dependency proper,
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// but an addition of this file to the output of the gn rule that writes it.
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// This dependency will, however, cause the gen step to be re-run and the
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// build restarted if the file is missing.
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g_scheduler->AddGenDependency(
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scope->settings()->build_settings()->GetFullPath(source_file));
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// Compute output.
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std::ostringstream contents;
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if (args[1].type() == Value::LIST) {
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const std::vector<Value>& list = args[1].list_value();
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for (const auto& cur : list)
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contents << cur.ToString(false) << std::endl;
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} else {
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contents << args[1].ToString(false);
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}
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base::FilePath file_path =
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scope->settings()->build_settings()->GetFullPath(source_file);
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// Make sure we're not replacing the same contents.
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if (!WriteFileIfChanged(file_path, contents.str(), err))
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*err = Err(function->function(), err->message(), err->help_text());
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return Value();
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}
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} // namespace functions
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