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//

// Copyright (c) Microsoft Corporation. All rights reserved.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

//

// Allows for executing a program with command-line arguments and reading the result

interface IExec {

exec: (fileName: string, cmdLineArgs: string[], handleResult: (ExecResult: ExecResult) => void) => void;

}

class ExecResult {

public stdout = "";

public stderr = "";

public exitCode: number;

}

class WindowsScriptHostExec implements IExec {

public exec(fileName: string, cmdLineArgs: string[], handleResult: (ExecResult: ExecResult) => void) : void {

var result = new ExecResult();

var shell = new ActiveXObject('WScript.Shell');

try {

var process = shell.Exec(fileName + ' ' + cmdLineArgs.join(' '));

} catch(e) {

result.stderr = e.message;

result.exitCode = 1;

handleResult(result);

return;

}

// Wait for it to finish running

while (process.Status != 0) { /* todo: sleep? */ }

result.exitCode = process.ExitCode;

if(!process.StdOut.AtEndOfStream) result.stdout = process.StdOut.ReadAll();

if(!process.StdErr.AtEndOfStream) result.stderr = process.StdErr.ReadAll();

handleResult(result);

}

}

class NodeExec implements IExec {

public exec(fileName: string, cmdLineArgs: string[], handleResult: (ExecResult: ExecResult) => void) : void {

var nodeExec = require('child_process').exec;

var result = new ExecResult();

result.exitCode = null;

var cmdLine = fileName + ' ' + cmdLineArgs.join(' ');

var process = nodeExec(cmdLine, function(error: any, stdout: string, stderr: string) {

result.stdout = stdout;

result.stderr = stderr;

result.exitCode = error ? error.code : 0;

handleResult(result);

});

}

}

var Exec: IExec = function() : IExec {

var global = <any>Function("return this;").call(null);

if(typeof global.ActiveXObject !== "undefined") {

return new WindowsScriptHostExec();

} else {

return new NodeExec();

}

}();