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'use strict';
const path = require('path');
const resolveCommand = require('./util/resolveCommand');
const escape = require('./util/escape');
const readShebang = require('./util/readShebang');
const isWin = process.platform === 'win32';
const isExecutableRegExp = /\.(?:com|exe)$/i;
const isCmdShimRegExp = /node_modules[\\/].bin[\\/][^\\/]+\.cmd$/i;
function detectShebang(parsed) {
parsed.file = resolveCommand(parsed);
const shebang = parsed.file && readShebang(parsed.file);
if (shebang) {
parsed.args.unshift(parsed.file);
parsed.command = shebang;
return resolveCommand(parsed);
}
return parsed.file;
}
function parseNonShell(parsed) {
if (!isWin) {
return parsed;
}
// Detect & add support for shebangs
const commandFile = detectShebang(parsed);
// We don't need a shell if the command filename is an executable
const needsShell = !isExecutableRegExp.test(commandFile);
// If a shell is required, use cmd.exe and take care of escaping everything correctly
// Note that `forceShell` is an hidden option used only in tests
if (parsed.options.forceShell || needsShell) {
// Need to double escape meta chars if the command is a cmd-shim located in `node_modules/.bin/`
// The cmd-shim simply calls execute the package bin file with NodeJS, proxying any argument
// Because the escape of metachars with ^ gets interpreted when the cmd.exe is first called,
// we need to double escape them
const needsDoubleEscapeMetaChars = isCmdShimRegExp.test(commandFile);
// Normalize posix paths into OS compatible paths (e.g.: foo/bar -> foo\bar)
// This is necessary otherwise it will always fail with ENOENT in those cases
parsed.command = path.normalize(parsed.command);
// Escape command & arguments
parsed.command = escape.command(parsed.command);
parsed.args = parsed.args.map((arg) => escape.argument(arg, needsDoubleEscapeMetaChars));
const shellCommand = [parsed.command].concat(parsed.args).join(' ');
parsed.args = ['/d', '/s', '/c', `"${shellCommand}"`];
parsed.command = process.env.comspec || 'cmd.exe';
parsed.options.windowsVerbatimArguments = true; // Tell node's spawn that the arguments are already escaped
}
return parsed;
}
function parse(command, args, options) {
// 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 = Object.assign({}, options); // Clone object to avoid changing the original
// Build our parsed object
const parsed = {
command,
args,
options,
file: undefined,
original: {
command,
args,
},
};
// Delegate further parsing to shell or non-shell
return options.shell ? parsed : parseNonShell(parsed);
}
module.exports = parse;
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