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'use strict';
var resolveCommand = require('./util/resolveCommand');
var hasEmptyArgumentBug = require('./util/hasEmptyArgumentBug');
var escapeArgument = require('./util/escapeArgument');
var escapeCommand = require('./util/escapeCommand');
var readShebang = require('./util/readShebang');
var isWin = process.platform === 'win32';
var skipShellRegExp = /\.(?:com|exe)$/i;
// Supported in Node >= 6 and >= 4.8
var supportsShellOption = parseInt(process.version.substr(1).split('.')[0], 10) >= 6 ||
parseInt(process.version.substr(1).split('.')[0], 10) === 4 && parseInt(process.version.substr(1).split('.')[1], 10) >= 8;
function parseNonShell(parsed) {
var shebang;
var needsShell;
var applyQuotes;
if (!isWin) {
return parsed;
}
// Detect & add support for shebangs
parsed.file = resolveCommand(parsed.command);
parsed.file = parsed.file || resolveCommand(parsed.command, true);
shebang = parsed.file && readShebang(parsed.file);
if (shebang) {
parsed.args.unshift(parsed.file);
parsed.command = shebang;
needsShell = hasEmptyArgumentBug || !skipShellRegExp.test(resolveCommand(shebang) || resolveCommand(shebang, true));
} else {
needsShell = hasEmptyArgumentBug || !skipShellRegExp.test(parsed.file);
}
// If a shell is required, use cmd.exe and take care of escaping everything correctly
if (needsShell) {
// Escape command & arguments
applyQuotes = (parsed.command !== 'echo'); // Do not quote arguments for the special "echo" command
parsed.command = escapeCommand(parsed.command);
parsed.args = parsed.args.map(function (arg) {
return escapeArgument(arg, applyQuotes);
});
// Make use of cmd.exe
parsed.args = ['/d', '/s', '/c', '"' + parsed.command + (parsed.args.length ? ' ' + parsed.args.join(' ') : '') + '"'];
parsed.command = process.env.comspec || 'cmd.exe';
parsed.options.windowsVerbatimArguments = true; // Tell node's spawn that the arguments are already escaped
}
return parsed;
}
function parseShell(parsed) {
var shellCommand;
// If node supports the shell option, there's no need to mimic its behavior
if (supportsShellOption) {
return parsed;
}
// Mimic node shell option, see: https://github.com/nodejs/node/blob/b9f6a2dc059a1062776133f3d4fd848c4da7d150/lib/child_process.js#L335
shellCommand = [parsed.command].concat(parsed.args).join(' ');
if (isWin) {
parsed.command = typeof parsed.options.shell === 'string' ? parsed.options.shell : process.env.comspec || 'cmd.exe';
parsed.args = ['/d', '/s', '/c', '"' + shellCommand + '"'];
parsed.options.windowsVerbatimArguments = true; // Tell node's spawn that the arguments are already escaped
} else {
if (typeof parsed.options.shell === 'string') {
parsed.command = parsed.options.shell;
} else if (process.platform === 'android') {
parsed.command = '/system/bin/sh';
} else {
parsed.command = '/bin/sh';
}
parsed.args = ['-c', shellCommand];
}
return parsed;
}
// ------------------------------------------------
function parse(command, args, options) {
var parsed;
// Normalize arguments, similar to nodejs
if (args && !Array.isArray(args)) {
options = args;
args = null;
}
args = args ? args.slice(0) : []; // Clone array to avoid changing the original
options = options || {};
// Build our parsed object
parsed = {
command: command,
args: args,
options: options,
file: undefined,
original: command,
};
// Delegate further parsing to shell or non-shell
return options.shell ? parseShell(parsed) : parseNonShell(parsed);
}
module.exports = parse;
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