56 lines
1.5 KiB
Dart
56 lines
1.5 KiB
Dart
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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library which.src.which_impl;
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import 'dart:async';
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import 'package:when/when.dart';
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import 'util.dart';
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Future<String> which(
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String command,
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Iterable<String> candidatePaths,
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bool isWindows,
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Future<bool> isExecutable(String path, bool isWindows),
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orElse()) => new Future(() => _which(
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command,
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candidatePaths,
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isWindows,
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isExecutable,
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orElse,
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toSequence: (items) => new Stream.fromIterable(items)));
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String whichSync(
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String command,
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Iterable<String> candidatePaths,
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bool isWindows,
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bool isExecutable(String path, bool isWindows),
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orElse()) => _which(
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command,
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candidatePaths,
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isWindows,
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isExecutable,
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orElse);
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_which(
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String command,
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Iterable<String> candidatePaths,
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bool isWindows,
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isExecutable(String path, bool isWindows),
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orElse(),
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{toSequence(Iterable items): identity}) => when(
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() => firstWhere(
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toSequence(candidatePaths),
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(path) => isExecutable(path, isWindows),
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orElse: orElse != null ? orElse : () => _commandNotFound(command, null)),
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onError: (e) => _commandNotFound(command, e));
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_commandNotFound(String command, e) {
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var message = 'Command not found: $command';
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if (e != null) message += '\n$e';
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throw new StateError(message);
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}
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