update

node_modules/errno/custom.js

@@ -0,0 +1,57 @@
+var prr = require('prr')
+
+function init (type, message, cause) {
+  if (!!message && typeof message != 'string') {
+    message = message.message || message.name
+  }
+  prr(this, {
+      type    : type
+    , name    : type
+      // can be passed just a 'cause'
+    , cause   : typeof message != 'string' ? message : cause
+    , message : message
+  }, 'ewr')
+}
+
+// generic prototype, not intended to be actually used - helpful for `instanceof`
+function CustomError (message, cause) {
+  Error.call(this)
+  if (Error.captureStackTrace)
+    Error.captureStackTrace(this, this.constructor)
+  init.call(this, 'CustomError', message, cause)
+}
+
+CustomError.prototype = new Error()
+
+function createError (errno, type, proto) {
+  var err = function (message, cause) {
+    init.call(this, type, message, cause)
+    //TODO: the specificity here is stupid, errno should be available everywhere
+    if (type == 'FilesystemError') {
+      this.code    = this.cause.code
+      this.path    = this.cause.path
+      this.errno   = this.cause.errno
+      this.message =
+        (errno.errno[this.cause.errno]
+          ? errno.errno[this.cause.errno].description
+          : this.cause.message)
+        + (this.cause.path ? ' [' + this.cause.path + ']' : '')
+    }
+    Error.call(this)
+    if (Error.captureStackTrace)
+      Error.captureStackTrace(this, err)
+  }
+  err.prototype = !!proto ? new proto() : new CustomError()
+  return err
+}
+
+module.exports = function (errno) {
+  var ce = function (type, proto) {
+    return createError(errno, type, proto)
+  }
+  return {
+      CustomError     : CustomError
+    , FilesystemError : ce('FilesystemError')
+    , createError     : ce
+  }
+}