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var _ = require('lodash');
var childProcess = require('child_process');
var Promise = require('./promise');
// On borwser, command execution is not possible
var isAvailable = childProcess && childProcess.exec;
// Execute a command
function exec(command, options) {
if (!isAvailable) {
return Promise.reject(new Error('Command execution is not possible on this platform'));
}
var d = Promise.defer();
var child = childProcess.exec(command, options, function(err, stdout, stderr) {
if (!err) {
return d.resolve();
}
err.message = stdout.toString('utf8') + stderr.toString('utf8');
d.reject(err);
});
child.stdout.on('data', function (data) {
d.notify(data);
});
child.stderr.on('data', function (data) {
d.notify(data);
});
return d.promise;
}
// Spawn an executable
function spawn(command, args, options) {
if (!isAvailable) {
return Promise.reject(new Error('Command execution is not possible on this platform'));
}
var d = Promise.defer();
var child = childProcess.spawn(command, args, options);
child.on('error', function(error) {
return d.reject(error);
});
child.on('close', function(code) {
if (code === 0) {
d.resolve();
} else {
d.reject(new Error('Error with command "'+command+'"'));
}
});
return d.promise;
}
// Transform an option object to a command line string
function escapeShellArg(s) {
s = s.replace(/"/g, '\\"');
return '"' + s + '"';
}
function optionsToShellArgs(options) {
return _.chain(options)
.map(function(value, key) {
if (value === null || value === undefined || value === false) return null;
if (value === true) return key;
return key + '=' + escapeShellArg(value);
})
.compact()
.value()
.join(' ');
}
module.exports = {
isAvailable: isAvailable,
exec: exec,
spawn: spawn,
optionsToShellArgs: optionsToShellArgs
};
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