lib/src/io.dart

// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

library dart_style.src.io;

import 'dart:io';

import 'package:path/path.dart' as p;

import 'dart_formatter.dart';
import 'formatter_options.dart';
import 'formatter_exception.dart';
import 'source_code.dart';

/// Runs the formatter on every .dart file in [path] (and its subdirectories),
/// and replaces them with their formatted output.
///
/// Returns `true` if successful or `false` if an error occurred in any of the
/// files.
bool processDirectory(FormatterOptions options, Directory directory) {
  options.reporter.showDirectory(directory.path);

  var success = true;
  for (var entry in directory.listSync(
      recursive: true, followLinks: options.followLinks)) {
    var relative = p.relative(entry.path, from: directory.path);

    if (entry is Link) {
      options.reporter.showSkippedLink(relative);
      continue;
    }

    if (entry is! File || !entry.path.endsWith(".dart")) continue;

    // If the path is in a subdirectory starting with ".", ignore it.
    if (p.split(relative).any((part) => part.startsWith("."))) {
      options.reporter.showHiddenFile(relative);
      continue;
    }

    if (!processFile(options, entry, label: relative)) success = false;
  }

  return success;
}

/// Runs the formatter on [file].
///
/// Returns `true` if successful or `false` if an error occurred.
bool processFile(FormatterOptions options, File file, {String label}) {
  if (label == null) label = file.path;

  var formatter = new DartFormatter(pageWidth: options.pageWidth);
  try {
    var source = new SourceCode(file.readAsStringSync(), uri: file.path);
    var output = formatter.formatSource(source);
    options.reporter.showFile(file, label, output,
        changed: source.text != output.text);
    return true;
  } on FormatterException catch (err) {
    stderr.writeln(err.message());
  } catch (err, stack) {
    stderr.writeln('''Hit a bug in the formatter when formatting $label.
Please report at: github.com/dart-lang/dart_style/issues
$err
$stack''');
  }

  return false;
}