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// Copyright (c) 2015, 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.
import 'dart:convert';
import 'dart:io';
import 'package:args/args.dart';
import 'package:dart_style/src/dart_formatter.dart';
import 'package:dart_style/src/formatter_exception.dart';
import 'package:dart_style/src/formatter_options.dart';
import 'package:dart_style/src/io.dart';
import 'package:dart_style/src/source_code.dart';
// Note: The following line of code is modified by tool/grind.dart.
const version = "0.2.8";
void main(List<String> args) {
var parser = new ArgParser(allowTrailingOptions: true);
parser.addFlag("help",
abbr: "h", negatable: false, help: "Shows usage information.");
parser.addFlag("version",
negatable: false, help: "Shows version information.");
parser.addOption("line-length",
abbr: "l", help: "Wrap lines longer than this.", defaultsTo: "80");
parser.addOption("indent",
abbr: "i", help: "Spaces of leading indentation.", defaultsTo: "0");
parser.addOption("preserve",
help: 'Selection to preserve, formatted as "start:length".');
parser.addFlag("dry-run",
abbr: "n",
negatable: false,
help: "Show which files would be modified but make no changes.");
parser.addFlag("overwrite",
abbr: "w",
negatable: false,
help: "Overwrite input files with formatted output.");
parser.addFlag("machine",
abbr: "m",
negatable: false,
help: "Produce machine-readable JSON output.");
parser.addFlag("profile",
negatable: false, help: "Display profile times after running.");
parser.addFlag("follow-links",
negatable: false,
help: "Follow links to files and directories.\n"
"If unset, links will be ignored.");
parser.addFlag("transform",
abbr: "t",
negatable: false,
help: "Unused flag for compability with the old formatter.");
ArgResults argResults;
try {
argResults = parser.parse(args);
} on FormatException catch (err) {
usageError(parser, err.message);
}
if (argResults["help"]) {
printUsage(parser);
return;
}
if (argResults["version"]) {
print(version);
return;
}
// Can only preserve a selection when parsing from stdin.
List<int> selection;
if (argResults["preserve"] != null && argResults.rest.isNotEmpty) {
usageError(parser, "Can only use --preserve when reading from stdin.");
}
try {
selection = parseSelection(argResults["preserve"]);
} on FormatException catch (_) {
usageError(
parser,
'--preserve must be a colon-separated pair of integers, was '
'"${argResults['preserve']}".');
}
if (argResults["dry-run"] && argResults["overwrite"]) {
usageError(
parser, "Cannot use --dry-run and --overwrite at the same time.");
}
checkForReporterCollision(String chosen, String other) {
if (!argResults[other]) return;
usageError(parser, "Cannot use --$chosen and --$other at the same time.");
}
var reporter = OutputReporter.print;
if (argResults["dry-run"]) {
checkForReporterCollision("dry-run", "overwrite");
checkForReporterCollision("dry-run", "machine");
reporter = OutputReporter.dryRun;
} else if (argResults["overwrite"]) {
checkForReporterCollision("overwrite", "machine");
if (argResults.rest.isEmpty) {
usageError(parser,
"Cannot use --overwrite without providing any paths to format.");
}
reporter = OutputReporter.overwrite;
} else if (argResults["machine"]) {
reporter = OutputReporter.printJson;
}
if (argResults["profile"]) {
reporter = new ProfileReporter(reporter);
}
var pageWidth;
try {
pageWidth = int.parse(argResults["line-length"]);
} on FormatException catch (_) {
usageError(
parser,
'--line-length must be an integer, was '
'"${argResults['line-length']}".');
}
var indent;
try {
indent = int.parse(argResults["indent"]);
if (indent < 0 || indent.toInt() != indent) throw new FormatException();
} on FormatException catch (_) {
usageError(
parser,
'--indent must be a non-negative integer, was '
'"${argResults['indent']}".');
}
var followLinks = argResults["follow-links"];
var options = new FormatterOptions(reporter,
indent: indent, pageWidth: pageWidth, followLinks: followLinks);
if (argResults.rest.isEmpty) {
formatStdin(options, selection);
} else {
formatPaths(options, argResults.rest);
}
if (argResults["profile"]) {
(reporter as ProfileReporter).showProfile();
}
}
List<int> parseSelection(String selection) {
if (selection == null) return null;
var coordinates = selection.split(":");
if (coordinates.length != 2) {
throw new FormatException(
'Selection should be a colon-separated pair of integers, "123:45".');
}
return coordinates.map((coord) => coord.trim()).map(int.parse).toList();
}
/// Reads input from stdin until it's closed, and the formats it.
void formatStdin(FormatterOptions options, List<int> selection) {
var selectionStart = 0;
var selectionLength = 0;
if (selection != null) {
selectionStart = selection[0];
selectionLength = selection[1];
}
var input = new StringBuffer();
stdin.transform(new Utf8Decoder()).listen(input.write, onDone: () {
var formatter =
new DartFormatter(indent: options.indent, pageWidth: options.pageWidth);
try {
options.reporter.beforeFile(null, "<stdin>");
var source = new SourceCode(input.toString(),
uri: "stdin",
selectionStart: selectionStart,
selectionLength: selectionLength);
var output = formatter.formatSource(source);
options.reporter
.afterFile(null, "<stdin>", output, changed: source != output);
return;
} on FormatterException catch (err) {
stderr.writeln(err.message());
exitCode = 65; // sysexits.h: EX_DATAERR
} catch (err, stack) {
stderr.writeln('''Hit a bug in the formatter when formatting stdin.
Please report at: github.com/dart-lang/dart_style/issues
$err
$stack''');
exitCode = 70; // sysexits.h: EX_SOFTWARE
}
});
}
/// Formats all of the files and directories given by [paths].
void formatPaths(FormatterOptions options, List<String> paths) {
for (var path in paths) {
var directory = new Directory(path);
if (directory.existsSync()) {
if (!processDirectory(options, directory)) {
exitCode = 65;
}
continue;
}
var file = new File(path);
if (file.existsSync()) {
if (!processFile(options, file)) {
exitCode = 65;
}
} else {
stderr.writeln('No file or directory found at "$path".');
}
}
}
/// Prints [error] and usage help then exits with exit code 64.
void usageError(ArgParser parser, String error) {
printUsage(parser, error);
exit(64);
}
void printUsage(ArgParser parser, [String error]) {
var output = stdout;
var message = "Reformats whitespace in Dart source files.";
if (error != null) {
message = error;
output = stdout;
}
output.write("""$message
Usage: dartfmt [-n|-w] [files or directories...]
${parser.usage}
""");
}