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'use strict' var fs = require('graceful-fs') function extractPath (path, cmdshimContents) { if (/[.]cmd$/.test(path)) { return extractPathFromCmd(cmdshimContents) } else if (/[.]ps1$/.test(path)) { return extractPathFromPowershell(cmdshimContents) } else { return extractPathFromCygwin(cmdshimContents) } } function extractPathFromPowershell (cmdshimContents) { var matches = cmdshimContents.match(/"[$]basedir[/]([^"]+?)"\s+[$]args/) return matches && matches[1] } function extractPathFromCmd (cmdshimContents) { var matches = cmdshimContents.match(/"%(?:~dp0\|dp0%)\\([^"]+?)"\s+%[*]/) return matches && matches[1] } function extractPathFromCygwin (cmdshimContents) { var matches = cmdshimContents.match(/"[$]basedir[/]([^"]+?)"\s+"[$]@"/) return matches && matches[1] } function wrapError (thrown, newError) { newError.message = thrown.message newError.code = thrown.code return newError } function notaShim (path, er) { if (!er) { er = new Error() Error.captureStackTrace(er, notaShim) } er.code = 'ENOTASHIM' er.message = "Can't read shim path from '" + path + "', it doesn't appear to be a cmd-shim" return er } var readCmdShim = module.exports = function (path, cb) { var er = new Error() Error.captureStackTrace(er, readCmdShim) fs.readFile(path, function (readFileEr, contents) { if (readFileEr) return cb(wrapError(readFileEr, er)) var destination = extractPath(path, contents.toString()) if (destination) return cb(null, destination) return cb(notaShim(path, er)) }) } module.exports.sync = function (path) { var contents = fs.readFileSync(path) var destination = extractPath(path, contents.toString()) if (!destination) throw notaShim(path) return destination }