fix(file): readAsText() and adds readAsDataURL() in File plugin (#346)

* Updates docs for CameraPreview, Base64ToGallery and Developer.MD

-DEVELOPER.md: Corrects 'npm run tslint' instruction to 'npm run lint'
-CameraPreview: Fixes syntax error in hide
-Base64ToGallery: Adds desc of options obj props

* Fixes resolveLocalFileSystemURL bug in File.readAsText() and adds File.readAsDataUrl()

- File.readAsText(): window.resolveLocalFileSystemURL() was incorrectly implemented

* Updates callback arg in File.checkFile()

Callback arg of window.resolveLocalFileSystemURL was fileSystem, but it actually returns fileEntry

* Corrects repo link and comments out setFlashMode()

- Repo prop and link in desc were not pointing to the same gh repo as the plugin
- setFlashMode() is not currently available in the repo that gets pulled by the corodova plugin

src/plugins/camera-preview.ts

@@ -33,13 +33,13 @@ export interface CameraPreviewSize {
  * @description
  * Showing camera preview in HTML
  *
- * Requires {@link module:driftyco/ionic-native} and the Cordova plugin: `cordova-plugin-camera-preview`. For more info, please see the [Cordova Camera Preview Plugin Docs](https://github.com/westonganger/cordova-plugin-camera-preview).
+ * Requires {@link module:driftyco/ionic-native} and the Cordova plugin: `cordova-plugin-camera-preview`. For more info, please see the [Cordova Camera Preview Plugin Docs](https://github.com/cordova-plugin-camera-preview/cordova-plugin-camera-preview).
  *
  */
 @Plugin({
   plugin: 'cordova-plugin-camera-preview',
   pluginRef: 'cordova.plugins.camerapreview',
-  repo: 'https://github.com/westonganger/cordova-plugin-camera-preview',
+  repo: 'https://github.com/cordova-plugin-camera-preview/cordova-plugin-camera-preview',
   platforms: ['Android', 'iOS']
 })
 export class CameraPreview {
@@ -104,10 +104,10 @@ export class CameraPreview {
   /**
    * Set the default mode for the Flash.
    */
-  @Cordova({
-    sync: true
-  })
-  static setFlashMode(mode: number): void { };
+  // @Cordova({
+  //   sync: true
+  // })
+  // static setFlashMode(mode: number): void { };
 
   /**
    * Set camera color effect.

src/plugins/file.ts

@@ -363,9 +363,9 @@ export class File {
     try {
       var directory = path + file;
 
-      window.resolveLocalFileSystemURL(directory, function (fileSystem) {
-        if (fileSystem.isFile === true) {
-          resolveFn(fileSystem);
+      window.resolveLocalFileSystemURL(directory, function (fileEntry) {
+        if (fileEntry.isFile === true) {
+          resolveFn(fileEntry);
         } else {
           rejectFn({code: 13, message: 'input is not a file'});
         }
@@ -474,21 +474,17 @@ export class File {
   /**
    * Read a file as string.
    *
-   * @param {string} path Base FileSystem. Please refer to the iOS and Android filesystems above
-   * @param {string} fileName Name of file to move
+   * @param {string} uri Base FileSystem. Please refer to the iOS and Android filesystems above
    * @return Returns a Promise that resolves or rejects with an error.
    */
-  static readAsText(path: string, fileName: string): Promise<any> {
+  static readAsText(file_uri: string): Promise<any> {
     let resolveFn, rejectFn;
     let promise = new Promise((resolve, reject) => {resolveFn = resolve; rejectFn = reject; });
 
-    if ((/^\//.test(fileName))) {
-      rejectFn('file-name cannot start with \/');
-    }
-
     try {
-      window.resolveLocalFileSystemURL(path, function (fileSystem) {
-        fileSystem.getFile(fileName, {create: false}, function (fileEntry) {
+
+      window.resolveLocalFileSystemURL(file_uri, function (fileEntry) {
+        
           fileEntry.file(function (file) {
             var reader = new FileReader();
 
@@ -503,10 +499,52 @@ export class File {
             };
 
             reader.readAsText(file);
-          }, function (error) {
-            error.message = File.cordovaFileError[error.code];
-            rejectFn(error);
-          });
+          
+        }, function (err) {
+          err.message = File.cordovaFileError[err.code];
+          rejectFn(err);
+        });
+      }, function (er) {
+        er.message = File.cordovaFileError[er.code];
+        rejectFn(er);
+      });
+    } catch (e) {
+      e.message = File.cordovaFileError[e.code];
+      rejectFn(e);
+    }
+
+    return promise;
+  }
+
+  /**
+   * Read a file as string.
+   *
+   * @param {string} uri Base FileSystem. Please refer to the iOS and Android filesystems above
+   * @return Returns a Promise that resolves or rejects with an error.
+   */
+  static readAsDataURL(file_uri: string): Promise<any> {
+    let resolveFn, rejectFn;
+    let promise = new Promise((resolve, reject) => {resolveFn = resolve; rejectFn = reject; });
+
+    try {
+
+      window.resolveLocalFileSystemURL(file_uri, function (fileEntry) {
+        
+          fileEntry.file(function (file) {
+            var reader = new FileReader();
+
+            reader.onloadend = function(e) {
+              if (this.result !== undefined && this.result !== null) {
+                resolveFn(this.result);
+              } else if (this.error !== undefined && this.error !== null) {
+                rejectFn(this.error);
+              } else {
+                rejectFn({code: null, message: 'READER_ONLOADEND_ERR'});
+              }
+            };
+
+            reader.readAsDataURL(file);
+          
         }, function (err) {
           err.message = File.cordovaFileError[err.code];
           rejectFn(err);