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app.js
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app.js
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/**
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
/* globals getFileHandle, getNewFileHandle, readFile, verifyPermission,
writeFile */
// eslint-disable-next-line no-redeclare
const app = {
appName: 'Text Editor',
file: {
handle: null,
name: null,
isModified: false,
},
options: {
captureTabs: true,
fontSize: 14,
monoSpace: false,
wordWrap: true,
},
hasFSAccess: 'chooseFileSystemEntries' in window ||
'showOpenFilePicker' in window,
isMac: navigator.userAgent.includes('Mac OS X'),
};
// Verify the APIs we need are supported, show a polite warning if not.
if (app.hasFSAccess) {
document.getElementById('not-supported').classList.add('hidden');
gaEvent('File System APIs', 'FSAccess');
} else {
document.getElementById('lblLegacyFS').classList.toggle('hidden', false);
document.getElementById('butSave').classList.toggle('hidden', true);
gaEvent('File System APIs', 'Legacy');
}
/**
* Creates an empty notepad with no details in it.
*/
app.newFile = () => {
if (!app.confirmDiscard()) {
return;
}
app.setText();
app.setFile();
app.setModified(false);
app.setFocus(true);
gaEvent('FileAction', 'New');
};
/**
* Opens a file for reading.
*
* @param {FileSystemFileHandle} fileHandle File handle to read from.
*/
app.openFile = async (fileHandle) => {
if (!app.confirmDiscard()) {
return;
}
// If the File System Access API is not supported, use the legacy file apis.
if (!app.hasFSAccess) {
gaEvent('FileAction', 'Open', 'Legacy');
const file = await app.getFileLegacy();
if (file) {
app.readFile(file);
}
return;
}
// If a fileHandle is provided, verify we have permission to read/write it,
// otherwise, show the file open prompt and allow the user to select the file.
if (fileHandle) {
gaEvent('FileAction', 'OpenRecent', 'FSAccess');
if (await verifyPermission(fileHandle, true) === false) {
console.error(`User did not grant permission to '${fileHandle.name}'`);
return;
}
} else {
gaEvent('FileAction', 'Open', 'FSAccess');
try {
fileHandle = await getFileHandle();
} catch (ex) {
if (ex.name === 'AbortError') {
return;
}
gaEvent('Error', 'FileOpen', ex.name);
const msg = 'An error occured trying to open the file.';
console.error(msg, ex);
alert(msg);
}
}
if (!fileHandle) {
return;
}
const file = await fileHandle.getFile();
app.readFile(file, fileHandle);
};
/**
* Read the file from disk.
*
* @param {File} file File to read from.
* @param {FileSystemFileHandle} fileHandle File handle to read from.
*/
app.readFile = async (file, fileHandle) => {
try {
app.setText(await readFile(file));
app.setFile(fileHandle || file.name);
app.setModified(false);
app.setFocus(true);
} catch (ex) {
gaEvent('Error', 'FileRead', ex.name);
const msg = `An error occured reading ${app.fileName}`;
console.error(msg, ex);
alert(msg);
}
};
/**
* Saves a file to disk.
*/
app.saveFile = async () => {
try {
if (!app.file.handle) {
return await app.saveFileAs();
}
gaEvent('FileAction', 'Save');
await writeFile(app.file.handle, app.getText());
app.setModified(false);
} catch (ex) {
gaEvent('Error', 'FileSave', ex.name);
const msg = 'Unable to save file';
console.error(msg, ex);
alert(msg);
}
app.setFocus();
};
/**
* Saves a new file to disk.
*/
app.saveFileAs = async () => {
if (!app.hasFSAccess) {
gaEvent('FileAction', 'Save As', 'Legacy');
app.saveAsLegacy(app.file.name, app.getText());
app.setFocus();
return;
}
gaEvent('FileAction', 'Save As', 'FSAccess');
let fileHandle;
try {
fileHandle = await getNewFileHandle();
} catch (ex) {
if (ex.name === 'AbortError') {
return;
}
gaEvent('Error', 'FileSaveAs1', ex.name);
const msg = 'An error occured trying to open the file.';
console.error(msg, ex);
alert(msg);
return;
}
try {
await writeFile(fileHandle, app.getText());
app.setFile(fileHandle);
app.setModified(false);
} catch (ex) {
gaEvent('Error', 'FileSaveAs2', ex.name);
const msg = 'Unable to save file.';
console.error(msg, ex);
alert(msg);
gaEvent('Error', 'Unable to write file', 'FSAccess');
return;
}
app.setFocus();
};
/**
* Attempts to close the window
*/
app.quitApp = () => {
if (!app.confirmDiscard()) {
return;
}
gaEvent('FileAction', 'Quit');
window.close();
};