From 5cbebd135cb770f1159f6f99c04873c636148327 Mon Sep 17 00:00:00 2001
From: Abir Viqar <abiviq@hushmail.com>
Date: Sat, 23 Nov 2013 13:34:57 -0500
Subject: [PATCH] add lstat

---
 README.md                |  4 ++
 src/fs.js                | 71 ++++++++++++++++++++++++++++++++-
 tests/spec/idbfs.spec.js | 86 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 160 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index b0e9a49..4fbc28c 100644
--- a/README.md
+++ b/README.md
@@ -170,3 +170,7 @@ Unlike node.js, IDBFS does not accept the optional `type` parameter.
 #### fs.readlink(path, callback)
 
 Asynchronous readlink(2). Callback gets `(error, linkContents)`, where `linkContents` is a string containing the path to which the symbolic link links to.
+
+#### fs.lstat(path, callback)
+
+Asynchronous lstat(2). Callback gets `(error, stats)`, See `fs.stat`.
diff --git a/src/fs.js b/src/fs.js
index 665ecfd..817866a 100644
--- a/src/fs.js
+++ b/src/fs.js
@@ -609,6 +609,51 @@ define(function(require) {
     }
   }
 
+  function lstat_file(objectStore, path, callback) {
+    path = normalize(path);
+    var name = basename(path);
+    var parentPath = dirname(path);
+
+    var directoryNode;
+    var directoryData;
+
+    if(ROOT_DIRECTORY_NAME == name) {
+      read_object(objectStore, ROOT_NODE_ID, check_file);
+    } else {
+      find_node(objectStore, parentPath, read_directory_data);
+    }
+
+    function read_directory_data(error, result) {
+      if(error) {
+        callback(error);
+      } else {
+        directoryNode = result;
+        read_object(objectStore, directoryNode.data, check_if_file_exists);
+      }
+    }
+
+    function check_if_file_exists(error, result) {
+      if(error) {
+        callback(error);
+      } else {
+        directoryData = result;
+        if(!_(directoryData).has(name)) {
+          callback(new ENoEntry('a component of the path does not name an existing file'));
+        } else {
+          read_object(objectStore, directoryData[name].id, check_file);
+        }
+      }
+    }
+
+    function check_file(error, result) {
+      if(error) {
+        callback(error);
+      } else {
+        callback(undefined, result);
+      }
+    }
+  }
+
   function link_node(objectStore, oldpath, newpath, callback) {
     oldpath = normalize(oldpath);
     var oldname = basename(oldpath);
@@ -1329,8 +1374,20 @@ define(function(require) {
   FileSystem.prototype._realpath = function _realpath(fd, length, callback) {
 
   };
-  FileSystem.prototype._lstat = function _lstat(fd, length, callback) {
+  FileSystem.prototype._lstat = function _lstat(context, path, callback) {
+    var that = this;
 
+    function check_result(error, result) {
+      if(error) {
+        // if(transaction.error) transaction.abort();
+        callback(error);
+      } else {
+        var stats = new Stats(result, that.name);
+        callback(undefined, stats);
+      }
+    }
+
+    lstat_file(context, path, check_result);
   };
 
   function IndexedDBContext(objectStore) {
@@ -1636,6 +1693,18 @@ define(function(require) {
     );
     if(error) callback(error);
   };
+  IndexedDBFileSystem.prototype.lstat = function lstat(path, callback) {
+    var fs = this;
+    var error = this._queueOrRun(
+      function() {
+        var transaction = fs.db.transaction([FILE_STORE_NAME], IDB_RW);
+        var files = transaction.objectStore(FILE_STORE_NAME);
+        var context = new IndexedDBContext(files);
+        fs._lstat(context, path, callback);
+      }
+    );
+    if(error) callback(error);
+  };
 
   // FIXME: WebSQL stuff, this needs implementation
   function WebSQLContext(transaction) {
diff --git a/tests/spec/idbfs.spec.js b/tests/spec/idbfs.spec.js
index 70634f6..e2d7257 100644
--- a/tests/spec/idbfs.spec.js
+++ b/tests/spec/idbfs.spec.js
@@ -201,6 +201,92 @@ describe('fs.fstat', function() {
   });
 });
 
+describe('fs.lstat', function() {
+  beforeEach(function() {
+    this.db_name = mk_db_name();
+    this.fs = new IDBFS.FileSystem(this.db_name, 'FORMAT');
+  });
+
+  afterEach(function() {
+    indexedDB.deleteDatabase(this.db_name);
+    delete this.fs;
+  });
+
+  it('should be a function', function() {
+    expect(typeof this.fs.lstat).toEqual('function');
+  });
+
+  it('should return an error if path does not exist', function() {
+    var complete = false;
+    var _error, _result;
+
+    this.fs.lstat('/tmp', function(error, result) {
+      _error = error;
+      _result = result;
+
+      complete = true;
+    });
+
+    waitsFor(function() {
+      return complete;
+    }, 'test to complete', DEFAULT_TIMEOUT);
+
+    runs(function() {
+      expect(_error).toBeDefined();
+      expect(_result).not.toBeDefined();
+    });
+  });
+
+  it('should return a stat object if path is not a symbolic link', function() {
+    var complete = false;
+    var _error, _result;
+    var that = this;
+
+    that.fs.lstat('/', function(error, result) {
+      _error = error;
+      _result = result;
+
+      complete = true;
+    });
+
+    waitsFor(function() {
+      return complete;
+    }, 'test to complete', DEFAULT_TIMEOUT);
+
+    runs(function() {
+      expect(_error).not.toBeDefined();
+      expect(_result).toBeDefined();
+    });
+  });
+
+
+  it('should return a stat object if path is a symbolic link', function() {
+    var complete = false;
+    var _error, _result;
+    var that = this;
+
+    that.fs.symlink('/', '/mylink', function(error) {
+      if(error) throw error;
+
+      that.fs.lstat('/mylink', function(error, result) {
+        _error = error;
+        _result = result;
+
+        complete = true;
+      });
+    });
+
+    waitsFor(function() {
+      return complete;
+    }, 'test to complete', DEFAULT_TIMEOUT);
+
+    runs(function() {
+      expect(_error).not.toBeDefined();
+      expect(_result).toBeDefined();
+    });
+  });
+});
+
 describe('fs.mkdir', function() {
   beforeEach(function() {
     this.db_name = mk_db_name();