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var spawn = require('child_process').spawn;

var command;

switch(process.platform) {
    case 'darwin':
        command = 'open';
        break;
    case 'win32':
        command = 'explorer.exe';
        break;
    case 'linux':
        command = 'xdg-open';
        break;
    default:
        throw new Error('Unsupported platform: ' + process.platform);
}

/**
 * Error handling is deliberately minimal, as this function is to be easy to use for shell scripting
 *
 * @param url The URL to open
 * @param callback A function with a single error argument. Optional.
 */

function open(url, callback) {
    var child = spawn(command, [url]);
    var errorText = "";
    child.stderr.setEncoding('utf8');
    child.stderr.on('data', function (data) {
        errorText += data;
    });
    child.stderr.on('end', function () {
        if (errorText.length > 0) {
            var error = new Error(errorText);
            if (callback) {
                callback(error);
            } else {
                throw error;
            }
        } else if (callback) {
            callback(error);
        }
    });
}

/**
 * @param fields Common fields are: "subject", "body".
 *     Some email apps let you specify arbitrary headers here.
 * @param recipientsSeparator Default is ",". Use ";" for Outlook.
 */
function mailto(recipients, fields, recipientsSeparator, callback) {
    recipientsSeparator = recipientsSeparator || ",";

    var url = "mailto:"+recipients.join(recipientsSeparator);
    Object.keys(fields).forEach(function (key, index) {
        if (index === 0) {
            url += "?";
        } else {
            url += "&";
        }
        url += key + "=" + encodeURIComponent(fields[key]);
    });
    open(url, callback);
}

exports.open = open;
exports.mailto = mailto;

	var spawn = require('child_process').spawn;

	var command;

	switch(process.platform) {
	case 'darwin':
	command = 'open';
	break;
	case 'win32':
	command = 'explorer.exe';
	break;
	case 'linux':
	command = 'xdg-open';
	break;
	default:
	throw new Error('Unsupported platform: ' + process.platform);
	}

	/**
	* Error handling is deliberately minimal, as this function is to be easy to use for shell scripting
	*
	* @param url The URL to open
	* @param callback A function with a single error argument. Optional.
	*/

	function open(url, callback) {
	var child = spawn(command, [url]);
	var errorText = "";
	child.stderr.setEncoding('utf8');
	child.stderr.on('data', function (data) {
	errorText += data;
	});
	child.stderr.on('end', function () {
	if (errorText.length > 0) {
	var error = new Error(errorText);
	if (callback) {
	callback(error);
	} else {
	throw error;
	}
	} else if (callback) {
	callback(error);
	}
	});
	}

	/**
	* @param fields Common fields are: "subject", "body".
	* Some email apps let you specify arbitrary headers here.
	* @param recipientsSeparator Default is ",". Use ";" for Outlook.
	*/
	function mailto(recipients, fields, recipientsSeparator, callback) {
	recipientsSeparator = recipientsSeparator \|\| ",";

	var url = "mailto:"+recipients.join(recipientsSeparator);
	Object.keys(fields).forEach(function (key, index) {
	if (index === 0) {
	url += "?";
	} else {
	url += "&";
	}
	url += key + "=" + encodeURIComponent(fields[key]);
	});
	open(url, callback);
	}

	exports.open = open;
	exports.mailto = mailto;