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/**
* SPDX-License-Identifier: LicenseRef-GPL-3.0-or-later-WITH-js-exceptions
*
* Make spreadsheets on drive.google.com browsable without nonfree js
*
* Copyright (C) 2021 Wojtek Kosior <koszko@koszko.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* As additional permission under GNU GPL version 3 section 7, you
* may distribute forms of that code without the copy of the GNU
* GPL normally required by section 4, provided you include this
* license notice and, in case of non-source distribution, a URL
* through which recipients can access the Corresponding Source.
* If you modify file(s) with this exception, you may extend this
* exception to your version of the file(s), but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* As a special exception to the GPL, any HTML file which merely
* makes function calls to this code, and for that purpose
* includes it by reference shall be deemed a separate work for
* copyright law purposes. If you modify this code, you may extend
* this exception to your version of the code, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* I, Wojtek Kosior, thereby promise not to sue for violation of this file's
* license. Although I request that you do not make use of this code in a
* proprietary program, I am not going to enforce this in court.
*/
/* Use with https://docs.google.com/spreadsheets/d/** */
/* Make the view scrollable. */
document.body.setAttribute("style",
"width: 100vw; height: 100vh; overflow: scroll;" +
(document.body.getAttribute("style") || ""));
let container = document.querySelectorAll(".waffle")[0];
let main_gid = null;
while (container) {
container = container.parentElement;
console.log(container);
if (container === document.body || !container)
break;
const match = /([0-9]+)-grid-container/.exec(container.id);
if (match)
main_gid = match[1];
container.setAttribute("style",
"width: fit-content; width: -moz-fit-content;");
}
/* Remove editor toolbars and bottom bar - these don't work anyway. */
const docs_chrome = document.getElementById("docs-chrome");
if (docs_chrome)
docs_chrome.remove();
const grid_bottom_bar = document.getElementById("grid-bottom-bar");
if (grid_bottom_bar)
grid_bottom_bar.remove();
/* Remove no Javascript warning. */
for (const no_js_warning of document.querySelectorAll("noscript"))
no_js_warning.remove();
/* Get opengraph data. */
const og = {};
for (const node of document.head.childNodes) {
if (node.tagName === "STYLE") {
document.head.removeChild(node);
continue;
}
if (node.tagName !== "META")
continue;
const match = /^og:(.+)/.exec(node.getAttribute("property"));
if (!match)
continue;
og[match[1]] = node.getAttribute("content");
}
/* Construct download link. */
let download_link = null;
const match = new RegExp("/spreadsheets/d/([^/]+)").exec(document.URL);
if (match)
download_link = `https://docs.google.com/spreadsheets/d/${match[1]}/export`;
/* Add title bar with sheet name and download button. */
const title_bar = document.createElement("div");
const title_heading = document.createElement("h1");
const title_text = document.createElement("span");
const main_download_button = document.createElement("a");
main_download_button.textContent = "download";
main_download_button.setAttribute("style", "border-radius: 10px; padding: 20px; color: #333; background-color: lightgreen; text-decoration: none; box-shadow: -4px 8px 8px #888; display: inline-block;");
if (og.title) {
title_text.textContent = og.title;
title_heading.appendChild(title_text);
}
title_text.setAttribute("style", "margin-right: 10px;");
if (download_link) {
main_download_button.setAttribute("href", download_link);
title_heading.appendChild(main_download_button);
}
title_bar.setAttribute("style", "padding: 0 20px; color: #555;");
title_bar.appendChild(title_heading);
document.body.insertBefore(title_bar, document.body.firstElementChild);
/* Extract sheet data from a script that sets the `bootstrapData' variable. */
let data = null;
for (const script of document.scripts) {
const match = /bootstrapData = ({([^;]|[^}];)+})/.exec(script.textContent);
if (!match)
continue;
data = JSON.parse(match[1]);
}
/*
* Add download buttons for individual sheets belonging to this spreadsheet.
* Data schema has been observed by looking at various spreadsheets.
*/
function add_sheet_download(data)
{
if (!Array.isArray(data))
return;
const gid = data[2];
if (!["string", "number"].includes(typeof gid))
return;
const sheet_download_link = `${download_link}?gid=${gid}`;
const sheet_download_button = document.createElement("a");
sheet_download_button.setAttribute("style", "border-radius: 5px; padding: 10px; color: #333; background-color: lightgreen; text-decoration: none; box-shadow: -4px 8px 8px #888; display: inline-block; margin: 0 5px 5px 0;");
sheet_download_button.setAttribute("href", sheet_download_link);
let sheet_name = null;
if (Array.isArray(data[3]) &&
data[3][0] && typeof data[3][0] === "object"
&& Array.isArray(data[3][0][1]) &&
Array.isArray(data[3][0][1][0]) &&
typeof data[3][0][1][0][2] === "string") {
const sheet_name = data[3][0][1][0][2];
sheet_download_button.textContent = sheet_name;
if (gid == main_gid)
title_text.textContent = `${title_text.textContent} - ${sheet_name}`;
} else {
sheet_download_button.textContent = `<sheet gid=${gid}>`;
}
title_bar.appendChild(sheet_download_button);
}
if (download_link) {
for (const entry of data.changes.topsnapshot) {
if (!Array.isArray(entry) || entry[0] !== 21350203 ||
typeof entry[1] !== "string")
continue;
let entry_data = null;
try {
entry_data = JSON.parse(entry[1]);
} catch (e) {
console.log(e);
continue;
}
add_sheet_download(entry_data);
}
}
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