| module.exports = which |
| which.sync = whichSync |
| |
| var path = require("path") |
| , fs |
| , COLON = process.platform === "win32" ? ";" : ":" |
| , isExe |
| |
| try { |
| fs = require("graceful-fs") |
| } catch (ex) { |
| fs = require("fs") |
| } |
| |
| if (process.platform == "win32") { |
| // On windows, there is no good way to check that a file is executable |
| isExe = function isExe () { return true } |
| } else { |
| isExe = function isExe (mod, uid, gid) { |
| //console.error(mod, uid, gid); |
| //console.error("isExe?", (mod & 0111).toString(8)) |
| var ret = (mod & 0001) |
| || (mod & 0010) && process.getgid && gid === process.getgid() |
| || (mod & 0100) && process.getuid && uid === process.getuid() |
| //console.error("isExe?", ret) |
| return ret |
| } |
| } |
| |
| |
| |
| function which (cmd, cb) { |
| if (isAbsolute(cmd)) return cb(null, cmd) |
| var pathEnv = (process.env.PATH || "").split(COLON) |
| , pathExt = [""] |
| if (process.platform === "win32") { |
| pathEnv.push(process.cwd()) |
| pathExt = (process.env.PATHEXT || ".EXE").split(COLON) |
| if (cmd.indexOf(".") !== -1) pathExt.unshift("") |
| } |
| //console.error("pathEnv", pathEnv) |
| ;(function F (i, l) { |
| if (i === l) return cb(new Error("not found: "+cmd)) |
| var p = path.resolve(pathEnv[i], cmd) |
| ;(function E (ii, ll) { |
| if (ii === ll) return F(i + 1, l) |
| var ext = pathExt[ii] |
| //console.error(p + ext) |
| fs.stat(p + ext, function (er, stat) { |
| if (!er && |
| stat && |
| stat.isFile() && |
| isExe(stat.mode, stat.uid, stat.gid)) { |
| //console.error("yes, exe!", p + ext) |
| return cb(null, p + ext) |
| } |
| return E(ii + 1, ll) |
| }) |
| })(0, pathExt.length) |
| })(0, pathEnv.length) |
| } |
| |
| function whichSync (cmd) { |
| if (isAbsolute(cmd)) return cmd |
| var pathEnv = (process.env.PATH || "").split(COLON) |
| , pathExt = [""] |
| if (process.platform === "win32") { |
| pathEnv.push(process.cwd()) |
| pathExt = (process.env.PATHEXT || ".EXE").split(COLON) |
| if (cmd.indexOf(".") !== -1) pathExt.unshift("") |
| } |
| for (var i = 0, l = pathEnv.length; i < l; i ++) { |
| var p = path.join(pathEnv[i], cmd) |
| for (var j = 0, ll = pathExt.length; j < ll; j ++) { |
| var cur = p + pathExt[j] |
| var stat |
| try { stat = fs.statSync(cur) } catch (ex) {} |
| if (stat && |
| stat.isFile() && |
| isExe(stat.mode, stat.uid, stat.gid)) return cur |
| } |
| } |
| throw new Error("not found: "+cmd) |
| } |
| |
| var isAbsolute = process.platform === "win32" ? absWin : absUnix |
| |
| function absWin (p) { |
| if (absUnix(p)) return true |
| // pull off the device/UNC bit from a windows path. |
| // from node's lib/path.js |
| var splitDeviceRe = |
| /^([a-zA-Z]:|[\\\/]{2}[^\\\/]+[\\\/][^\\\/]+)?([\\\/])?/ |
| , result = splitDeviceRe.exec(p) |
| , device = result[1] || '' |
| , isUnc = device && device.charAt(1) !== ':' |
| , isAbsolute = !!result[2] || isUnc // UNC paths are always absolute |
| |
| return isAbsolute |
| } |
| |
| function absUnix (p) { |
| return p.charAt(0) === "/" || p === "" |
| } |