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LICENSE

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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read

README.md

@@ -1,179 +1,218 @@
 # Pythagoras
 
-Local-run server which acts as a proxy between the moderation server, presentation client and subtitle scripts. This is a single-purpose ugly implementation with its sole purpose being the Richard Stallman lecture at TUL.
+**Pythagoras** is a local-run server that acts as a proxy between the moderation server, presentation client, and subtitle scripts. This implementation is specifically designed for the Richard Stallman lecture at TUL.
+
+## Table of Contents
+
+- [Dependencies](#dependencies)
+- [Installation](#installation)
+- [Running the App](#running-the-app)
+  - [Running Translation Server](#running-translation-server)
+  - [Cleaning Up](#cleaning-up)
+  - [Packing for Production](#packing-for-production)
+- [Usage](#usage)
+  - [Subtitles](#subtitles)
+  - [Commands](#commands)
+  - [Media](#media)
 
 ## Dependencies
 
-- pyenv
-- python virtualenv
-- bun
+- `pyenv`
+- `python-virtualenv`
+- `bun`
 
 ## Installation
 
-Clone the repository: 
+1. Clone the repository:
 
-`git clone git@gordon.zumepro.cz:zumepro/pythagoras.git`
+   ```bash
+   git clone git@gordon.zumepro.cz:zumepro/pythagoras.git
+   ```
 
-Install the dependencies:
+2. Install the dependencies:
 
-`sudo pacman -S python-virtualenv`
+   ```bash
+   sudo pacman -S python-virtualenv
+   ```
 
-## Running the app
+## Running the App
 
-Simply execute the **run** recipe in the Makefile to start the server:
+To start the server, simply execute the **run** recipe in the Makefile:
 
-`make run`
+```bash
+make run
+```
 
-Note that run is also the default recipe. So `make` works too.
+Note: `run` is the default recipe, so you can also just use:
 
-The run recipe should take care of everything for you... enjoy!
+```bash
+make
+```
 
-### Running translation server
+The run recipe will take care of everything for you. Enjoy!
 
-To start translation server for subtitle translation, run:
+### Running Translation Server
 
-`make libretranslate`
+To start the translation server for subtitle translation, run:
 
-You can keep it running through multiple `make run`'s.
-The makefile will pre-install everything if needed.
+```bash
+make libretranslate
+```
 
-### Cleaning up the mess
+You can keep it running through multiple `make run` commands. The Makefile will pre-install everything if needed.
 
-If you wish to go back to a clean slate just run:
+### Cleaning Up
 
-`make clean`
+If you wish to return to a clean slate, just run:
 
-### Packing for production
+```bash
+make clean
+```
 
-To make an archive `pythagoras.tar.xz` in project root simply run:
+### Packing for Production
 
-`make pack`
+To create an archive named `pythagoras.tar.xz` in the project root, simply run:
+
+```bash
+make pack
+```
 
 ## Usage
 
-To connect to the WebSocket for receiving subtitles, messages and commands, simply use the `/ws` endpoint, for example like this:
+To connect to the WebSocket for receiving subtitles, messages, and commands, use the `/ws` endpoint. For example:
 
-`
+```bash
 websocat ws://localhost:8000/ws
-`
+```
 
 ### Subtitles
 
 Here is a list of all subtitle types:
 
-- `subtitle_en_submit_sentence`, `subtitle_cs_submit_sentence`, `subtitle_en_update_current`
+- `subtitle_en_submit_sentence`
+- `subtitle_cs_submit_sentence`
+- `subtitle_en_update_current`
 
-To push new subtitles onto the server, use the `/subtitles/` endpoints. There are currently two different ones, and each produces different response type. When translation is enabled, each sentence submission yields two websocket messages, one in English and one in Czech. Here are some examples:
+To push new subtitles onto the server, use the `/subtitles/` endpoints. There are currently two different endpoints, each producing a different response type. When translation is enabled, each sentence submission yields two WebSocket messages, one in English and one in Czech. Here are some examples:
 
-___
+#### Update Current Subtitle
 
-- The first is `/subtitles/update_current`, which serves the purpose of updating the current sentence as it comes. Here is an example: 
+To update the current sentence as it comes, use:
 
-`
+```bash
 curl -X POST http://localhost:8000/subtitles/update_current -H "Content-Type: text/plain" -d 'I love pushing '
-`
+```
 
-___
+#### Submit Finished Sentence
 
-- The second is `/subtitles/submit_sentence`, which is used to submit the next finished sentence. Here is an example: 
+To submit the next finished sentence, use:
 
-`
+```bash
 curl -X POST http://localhost:8000/subtitles/submit_sentence -H "Content-Type: text/plain" -d 'I love pushing sentences to servers!'
-`
-
-___
-
+```
 
 ### Commands
 
-Here is a list of all commands:
+Here is a list of all available commands:
 
-- `getselectedmessage`, `setlibretranslate`, `setautopolling`, `autopollingrate`, `playvideo`, `seekvideo`, `setscreen_main`, `setscreen_video`, `setscreen_idle`
+- `getselectedmessage`
+- `setlibretranslate`
+- `setautopolling`
+- `autopollingrate`
+- `playvideo`
+- `seekvideo`
+- `setscreen_main`
+- `setscreen_video`
+- `setscreen_idle`
 
-To control the server using commands, use the `/control` endpoint, for example like this:
+To control the server using commands, use the `/control` endpoint. Here are some examples:
 
-___
+#### Get Selected Message
 
-- Poll the peehaitchpea server for the latest message to display:
+Poll the server for the latest message to display:
 
-`
+```bash
 curl -X POST http://localhost:8000/control -H "Content-Type: application/json" -d '{"command": "getselectedmessage"}'
-`
+```
 
-___
+#### Set LibreTranslate State
 
-- Change the state of the LibreTranslate translation module (active or deactivated):
+Change the state of the LibreTranslate translation module (active or deactivated):
 
-`
+```bash
 curl -X POST http://localhost:8000/control -H "Content-Type: application/json" -d '{"command": "setlibretranslate", "state": false}'
-`
+```
 
-___
+#### Set Auto-Polling State
 
-- Change the state of auto-polling:
+Change the state of auto-polling:
 
-`
+```bash
 curl -X POST http://localhost:8000/control -H "Content-Type: application/json" -d '{"command": "setautopolling", "state": false}'
-`
+```
 
-___
+#### Set Polling Rate
 
-- Set the polling rate to a value (in seconds):
+Set the polling rate to a value (in seconds):
 
-`
+```bash
 curl -X POST http://localhost:8000/control -H "Content-Type: application/json" -d '{"command": "autopollingrate", "rate": 10}'
-`
+```
 
-___
+#### Play Video
 
-- Tell the client to play a video, defined by the `filename` parameter. It has optional parameters `subtitles`, which should point to a subtitle file and defaults to `null`, and `secondsfromstart` which indicated the timestap at what the video should start, which defaults to `0`:
+Tell the client to play a video, defined by the `filename` parameter. It has optional parameters `subtitles` (which should point to a subtitle file and defaults to `null`) and `secondsfromstart` (which indicates the timestamp at which the video should start, defaulting to `0`):
 
-`
+```bash
 curl -X POST http://localhost:8000/control -H "Content-Type: application/json" -d '{"command": "playvideo", "filename": "stallman.webm"}'
-`
+```
 
-`
+To include subtitles and specify a start time:
+
+```bash
 curl -X POST http://localhost:8000/control -H "Content-Type: application/json" -d '{"command": "playvideo", "filename": "stallman.webm", "subtitles": "stallman.vtt", "secondsfromstart": 69}'
-`
+```
 
-___
+#### Seek Video
 
-- Seek the currently played video to a timestamp (in seconds):
+Seek the currently played video to a specific timestamp (in seconds):
 
-`
+```bash
 curl -X POST http://localhost:8000/control -H "Content-Type: application/json" -d '{"command": "seekvideo", "timestamp": 420}'
-`
+```
 
-___
+#### Set Screen to Main View
 
-- Set the screen of the client to the main view (subtitles and messages):
+Set the screen of the client to the main view (subtitles and messages):
 
-`
+```bash
 curl -X POST http://localhost:8000/control -H "Content-Type: application/json" -d '{"command": "setscreen_main"}'
-`
+```
 
-___
+#### Set Screen to Video Playback
 
-- Set the screen of the client to the video playback:
+Set the screen of the client to the video playback view:
 
-`
+```bash
 curl -X POST http://localhost:8000/control -H "Content-Type: application/json" -d '{"command": "setscreen_video"}'
-`
+```
 
-___
+#### Set Screen to Idle
 
-- Set the screen of the client to the idle screen (this is the default screen after startup of the app):
+Set the screen of the client to the idle screen (this is the default screen after startup of the app):
 
-`
+```bash
 curl -X POST http://localhost:8000/control -H "Content-Type: application/json" -d '{"command": "setscreen_idle"}'
-`
-
-___
+```
 
 ### Media
 
-You can also request media from Pythagoras using the `/media/` endpoint, which will yield you the standard HTTP FileResponse, here is an example:
+You can also request media from Pythagoras using the `/media/` endpoint, which will yield a standard HTTP FileResponse. Here’s an example:
 
-`
+```bash
 curl -X GET http://localhost:8000/media/stallman.webm
-`
+```
+
+## License
+
+This project is licensed under the GNU General Public License v3.0 - see the [LICENSE](LICENSE) file for details.

assets/zmp_logo.svg

@@ -0,0 +1 @@
+<svg height="50mm" viewBox="0 0 50 50.000001" width="50mm" xmlns="http://www.w3.org/2000/svg"><g fill-rule="evenodd" transform="matrix(-.63629813 0 0 -.63629813 66.59034128483 91.64520371211)"><path d="m-11.759578-96.806604v-3.098032q-2.223016-.189194-3.500067-1.418944-1.253402-1.2534-1.3007-3.28723h2.128418q0 1.15881.685824 1.89193.709473.73312 1.986525.89867v-6.19607l-.638526-.18919q-1.773682-.54393-2.743295-1.82098-.945964-1.27705-.945964-3.00344 0-1.89192 1.158805-3.12168 1.182455-1.22975 3.16898-1.41894v-3.12168h1.418946v3.09803q1.9628749.18919 3.1453299 1.41894 1.182455 1.22976 1.2061041 3.16898h-2.128419q0-1.1115-.5912275-1.79733-.5675783-.70947-1.6317875-.87501v5.86497l.9459637.30744q1.7263842.54393 2.6723482 1.84463.945964 1.3007.945964 3.05073 0 1.93923-1.2534023 3.21628-1.2297532 1.27705-3.3108736 1.489894v3.098032zm-2.199367-16.412476q0 1.06421.567579 1.84463.567578.78042 1.631788 1.11151v-5.41564q-1.040561.16554-1.631788.80406-.567579.63853-.567579 1.65544zm3.618313 11.39887q1.1588056-.1892 1.7973312-.89867.6385257-.70947.6385257-1.84463 0-1.04056-.5675784-1.79733-.5439293-.78042-1.5844895-1.11151l-.283789-.0946z" fill="#fff" transform="matrix(-1.0225486 0 0 -.97794862 24.554623 -1.612364)"/><path d="m-59.312695-104.31899q-.273111.60084-.710088 1.11065-.436977.4916-1.001405.87395-.546222.36415-1.219894.58264-.673673.20028-1.438383.20028-.782917 0-1.584041-.21849-.801125-.2367-1.547627-.54622-.910369-.36415-1.747908-.69188-.819332-.32774-1.602249-.32774-.910368 0-1.511212.45519-.600843.43698-1.074235 1.20169l-1.857152-1.32914q.273111-.60085.710088-1.09244.436977-.50981.983198-.87396.564429-.38235 1.238101-.58263.673673-.21849 1.438383-.21849.892161 0 1.80253.29131.910368.29132 1.747908.63726.782917.32774 1.529419.60085.746502.2549 1.401968.2549.892161 0 1.511212-.43698.61905-.45518 1.074235-1.21989z" fill="#9aff00" transform="scale(-1)"/><path d="m100.26473 100.06705v-3.596477l-7.441251 7.192957 7.441251 7.19295v-3.59647l-3.720626-3.59648z" fill="#fff"/></g></svg>

client/make.mk

@@ -1,7 +1,7 @@
 CLIENT_PAGES := index.html
 CLIENT_STYLES := style.css
 CLIENT_SCRIPTS := script.js
-CLIENT_ASSETS := fm_logo.svg qr_ask.svg
+CLIENT_ASSETS := fm_logo.svg zmp_logo.svg tul_logo.svg qr_ask.svg
 CLIENT_TARGETS := $(CLIENT_PAGES:%=static/%) \
 				  $(CLIENT_STYLES:%=static/%) \
 				  $(CLIENT_SCRIPTS:%=static/%) \

client/presentationmgr.ts

@@ -3,7 +3,7 @@ import {
 } from "./pythagoras_client";
 import { ScrollingTextBox } from "./scrolling_textbox";
 import { dict, IDLE_LOGOS, QUESTION_LINK, QUESTION_QR } from "./settings";
-import { el, sleep } from "./tools";
+import { AsyncRunner, el, sleep, wait_for_dom_refresh } from "./tools";
 
 interface PresentationScreen {
 	prepare(): Promise<void>;
@@ -27,7 +27,7 @@ export class PresentationManager {
 		await this.screen.prepare();
 		this.dom_root.innerHTML = "";
 		this.dom_root.appendChild(this.screen.dom);
-		await sleep(10);
+		await wait_for_dom_refresh();
 	}
 
 	public async serve(ws_client: PythagorasClient): Promise<void> {
@@ -67,33 +67,38 @@ export class PresentationManager {
 
 class MainScreen implements PresentationScreen {
 	private dom_root: HTMLDivElement;
-	private subs_english: ScrollingTextBox;
-	private subs_czech: ScrollingTextBox;
+	private subs_english: AsyncRunner<ScrollingTextBox>;
+	private subs_czech: AsyncRunner<ScrollingTextBox>;
 	private dom_question: HTMLDivElement;
 	private dom_question_link: HTMLDivElement;
 	private question_insert: HTMLParagraphElement;
 
 	public constructor() {
-		this.subs_english = new ScrollingTextBox();
-		this.subs_czech = new ScrollingTextBox();
-		this.question_insert = el.p("");
+		const subs_en = new ScrollingTextBox();
+		const subs_cz = new ScrollingTextBox();
+		this.subs_english = new AsyncRunner(subs_en);
+		this.subs_czech = new AsyncRunner(subs_cz);
+		this.question_insert = el.p("Otázka");
 		this.dom_question_link = el.div([el.h1(QUESTION_LINK)], ["link"]);
 		this.dom_question = el.div([this.dom_question_link, this.question_insert], ["question"]);
 		this.dom_root = el.div([
 			this.dom_question,
 			el.div([
-				el.div([this.subs_english.dom], ["lang"]),
-				el.div([this.subs_czech.dom], ["lang"]),
+				el.div([subs_en.dom], ["lang"]),
+				el.div([subs_cz.dom], ["lang"]),
 			], ["subtitles"]),
+			el.div([
+				el.p("Jedná se o automaticky generovaný přepis. Omluvte, prosíme, případné chyby.", ["disclaimer"]),
+			]),
 		], ["main"]);
 	}
 
 	public async prepare(): Promise<void> {
-		this.dom_question_link.append(await el.img(QUESTION_QR, ["qr"]));
+		//this.dom_question_link.append(await el.img(QUESTION_QR, ["qr"]));
 	}
 
 	public async start(): Promise<void> {
-		await sleep(10);
+		await wait_for_dom_refresh();
 		this.dom_root.style.opacity = "1";
 		await sleep(500);
 	}
@@ -117,13 +122,19 @@ class MainScreen implements PresentationScreen {
 	public async serve(trigger: PythagorasIncomingMessage): Promise<void> {
 		switch (trigger.type) {
 			case PythagorasIncomingMessageType.SubEnUpdateCur:
-				await this.subs_english.update_current(trigger.text);
+				this.subs_english.run((target: ScrollingTextBox) => {
+					return target.update_current(trigger.text)
+				});
 				break;
 			case PythagorasIncomingMessageType.SubEnSubmit:
-				await this.subs_english.finish_line(trigger.text);
+				this.subs_english.run((target: ScrollingTextBox) => {
+					return target.finish_current(trigger.text);
+				});
 				break;
 			case PythagorasIncomingMessageType.SubCzSubmit:
-				await this.subs_czech.add_line(trigger.text);
+				this.subs_czech.run((target: ScrollingTextBox) => {
+					return target.add_line(trigger.text);
+				});
 				break;
 			case PythagorasIncomingMessageType.SelectedMessage:
 				if (trigger.message === null) { this.hide_question(); }
@@ -198,7 +209,7 @@ class VideoScreen implements PresentationScreen {
 		this.dom_video.currentTime = seconds_from_start;
 		this.dom_root.innerHTML = "";
 		this.dom_root.appendChild(this.dom_video);
-		await sleep(10);
+		await wait_for_dom_refresh();
 		await this.start();
 	}
 
@@ -215,7 +226,7 @@ class IdleScreen implements PresentationScreen {
 	private dom_root: HTMLDivElement;
 	private dom_title: HTMLHeadingElement;
 	private dom_subtitle: HTMLHeadingElement;
-	private dom_logos: HTMLImageElement[];
+	private dom_logos: HTMLDivElement[];
 
 	public constructor() {
 		this.dom_title = el.h1(dict.IDLE_TITLE)
@@ -226,14 +237,14 @@ class IdleScreen implements PresentationScreen {
 
 	public async prepare(): Promise<void> {
 		for (const logo of IDLE_LOGOS) {
-			this.dom_logos.push(await el.img(logo, ["logo"]));
+			this.dom_logos.push(el.div([await el.img(logo)], ["logo"]));
 		}
 		const logos = el.div([...this.dom_logos], ["logos"]);
 		this.dom_root.appendChild(logos);
 	}
 
 	public async start(): Promise<void> {
-		await sleep(10);
+		await wait_for_dom_refresh();
 		this.dom_title.style.transform = "translateY(0)";
 		this.dom_title.style.opacity = "1";
 		await sleep(250);

client/pythagoras_client.ts

@@ -119,7 +119,6 @@ export class PythagorasClient {
 			const payload = await this.recv_inner();
 			const text = payload.bytes === undefined ?
 				(await payload.text()).slice(4) : (utf8_decode((await payload.bytes()).slice(4)));
-			console.log("payload:", text);
 			const parsed = JSON.parse(text);
 			return parsed;
 		}

client/scrolling_textbox.ts

@@ -1,138 +1,281 @@
-import { DELAY_WORDS } from "./settings";
-import { el, sleep } from "./tools";
+import { el, sleep, wait_for_dom_refresh } from "./tools";
 
-export class ScrollingTextBox {
-	private dom_root: HTMLDivElement;
+class Word {
+	private dom_root: HTMLParagraphElement;
 
-	private prev_line_words: HTMLDivElement[];
-	private cur_line_words: HTMLDivElement[];
+	private inner: string;
+	private is_visible: boolean;
 
-	private prev_line: HTMLParagraphElement;
-	private current_line: HTMLParagraphElement;
+	private static ANIMATION_DURATION: number = 20;
 
-	public constructor() {
-		this.dom_root = el.div([], ["scrolling-textbox"]);
-		this.cur_line_words = [];
-		this.prev_line_words = [];
+	public constructor(inner: string, initially_visible: boolean = false) {
+		this.inner = inner;
+		this.is_visible = initially_visible;
+		this.dom_root = el.p(this.inner, ["word"]);
 
-		this.current_line = el.div(this.cur_line_words, ["paragraph", "active"]);
-		this.prev_line = el.div(this.prev_line_words, ["paragraph", "previous"]);
-
-		this.dom_root.appendChild(this.prev_line);
-		this.dom_root.appendChild(this.current_line);
-	}
-
-	public async update_current(text: string): Promise<void> {
-		this.update_words(this.current_line, this.cur_line_words, text);
-		await sleep(10);
-		this.show_new_words(this.cur_line_words);
-	}
-
-	public async finish_line(text: string): Promise<void> {
-		this.update_words(this.current_line, this.cur_line_words, text, true);
-		const current_height = this.current_line.getBoundingClientRect().height;
-		this.prev_line.style.transform = `translateY(calc(-100% - ${current_height}px))`;
-		this.current_line.style.transform = "translateY(-100%)";
-		this.current_line.style.color = "grey";
-		await sleep(500);
-		this.dom_root.removeChild(this.prev_line);
-		this.prev_line = this.current_line;
-		this.prev_line_words = this.cur_line_words;
-		this.prev_line.className = "paragraph previous";
-		this.current_line = el.div([], ["paragraph", "active"]);
-		this.cur_line_words = [];
-		this.dom_root.appendChild(this.current_line);
-		await sleep(10);
-	}
-
-	public async add_line(text: string): Promise<void> {
-		const current_height = this.current_line.getBoundingClientRect().height;
-		const next_words = this.make_words(text);
-		const next_line = el.div(next_words, ["paragraph", "previous"]);
-		next_line.style.transform = `translateY(${current_height}px)`;
-		next_line.style.opacity = "0";
-		this.dom_root.appendChild(next_line);
-		await sleep(50);
-		next_line.style.transform = "translateY(0px)";
-		next_line.style.opacity = "1";
-		this.current_line.style.transform = "translateY(-100%)";
-		this.current_line.style.color = "grey";
-		this.prev_line.style.transform = `translateY(calc(-100% - ${current_height}px))`;
-		await sleep(500);
-		this.dom_root.removeChild(this.prev_line);
-		this.prev_line = this.current_line;
-		this.prev_line_words = this.cur_line_words;
-		this.prev_line.className = "paragraph previous";
-		this.current_line = next_line;
-		this.current_line.className = "paragraph active";
-		this.cur_line_words = next_words;
-	}
-
-	private async show_new_words(words: HTMLParagraphElement[]): Promise<void> {
-		for (const word of words) {
-			if (word.style.opacity != "0") { continue; }
-			word.style.opacity = "1";
-			word.style.transform = "scale(100%)";
-			await sleep(50);
+		if (!this.is_visible) {
+			this.dom_root.style.opacity = "0";
+			this.dom_root.style.transform = "scale(0)";
 		}
 	}
 
-	private update_words(
-		parent: HTMLDivElement,
-		words: HTMLParagraphElement[],
-		new_text: string,
-		override: boolean = false,
-	): void {
-		const new_words = new_text.split(" ");
-		if (!override) {
-			for (let i = 0; i < DELAY_WORDS; ++i) { new_words.pop(); }
-		}
-		if (words.length > new_words.length) {
-			this.trim_words(parent, words, new_words.length);
-			for (let i = 0; i < new_words.length; ++i) {
-				if (words[i].innerText == new_words[i]) { continue; }
-				words[i].innerText = new_words[i];
-			}
-			return;
-		}
-		const to_push: HTMLParagraphElement[] = [];
-		for (let i = 0; i < new_words.length; ++i) {
-			if (i < words.length) {
-				if (new_words[i] == words[i].innerText) { continue; }
-				words[i].innerText = new_words[i];
-				continue;
-			}
-			const word = el.p(new_words[i], ["word"]);
-			if (!override) {
-				word.style.opacity = "0";
-				word.style.transform = "scale(0)";
-			}
-			words.push(word);
-			to_push.push(word);
-		}
-		parent.append(...to_push);
+	public set text(new_value: string) {
+		this.inner = new_value;
+		this.dom_root.innerText = this.inner;
 	}
 
-	private trim_words(
-		parent: HTMLDivElement,
-		words: HTMLParagraphElement[],
-		target_length: number
-	): void {
-		if (target_length >= words.length || words.length == 0) { return; }
-		for (let i = words.length - 1; i >= target_length; --i) {
-			const word = words.pop();
-			if (word === undefined) { continue; }
-			parent.removeChild(word);
-		}
+	public get text(): string {
+		return this.inner;
 	}
 
-	private make_words(text: string): HTMLDivElement[] {
-		const words = text.split(" ");
-		let res = [];
-		for (const word of words) {
-			res.push(el.p(word, ["word"]));
-		}
-		return res;
+	public async show(): Promise<void> {
+		if (this.is_visible) { return; }
+		this.dom_root.style.opacity = "1";
+		this.dom_root.style.transform = "scale(100%)";
+		this.is_visible = true;
+		await sleep(Word.ANIMATION_DURATION);
+	}
+
+	public get visible(): boolean {
+		return this.is_visible;
+	}
+
+	public get dom(): HTMLDivElement {
+		return this.dom_root;
+	}
+}
+
+class Paragraph {
+	private dom_root: HTMLDivElement;
+	private words: Word[];
+
+	private height: number;
+	private height_current: boolean;
+	private visible: boolean;
+	private vertical_position: number;
+
+	private static SUBTLE_COLOR: string = "gray";
+	private static ACTIVE_COLOR: string = "white";
+	private static WORD_ANIM_POST_WAIT: number = 180;
+
+	public constructor(initial_text: string | null) {
+		this.dom_root = el.div([], ["paragraph"]);
+		this.set_color(Paragraph.ACTIVE_COLOR);
+		this.words = [];
+		this.visible = true;
+		this.height = 0;
+		this.height_current = true;
+		this.vertical_position = 0;
+		this.set_initial_text(initial_text);
+	}
+
+	private set_initial_text(text: string | null): void {
+		if (text === null) { return; }
+		this.visible = false;
+		this.height_current = false;
+		this.dom_root.style.opacity = "0";
+		const initial_words = text.split(" ");
+		for (const word of initial_words) {
+			const cur_word = new Word(word, true);
+			this.words.push(cur_word);
+			this.dom_root.appendChild(cur_word.dom);
+		}
+	}
+
+	private set_color(new_color: string): void {
+		this.dom_root.style.color = new_color;
+	}
+
+	private trim_words(target_length: number): void {
+		if (this.words.length == 0 || target_length < 0) { return; }
+		if (this.words.length != target_length) { this.invalidate_height(); }
+		for (let i = this.words.length - 1; i >= target_length; --i) {
+			const current_pop = this.words.pop();
+			if (current_pop === undefined) { continue; }
+			this.dom_root.removeChild(current_pop.dom);
+		}
+	}
+
+	private invalidate_height(): void {
+		this.height_current = false;
+	}
+
+	public set_text(new_text: string): void {
+		const new_words = new_text.split(" ");
+		if (new_words.length < this.words.length) { this.trim_words(new_words.length); }
+		for (let i = 0; i < new_words.length; ++i) {
+			const new_word = new_words[i];
+			if (this.words.length <= i) {
+				const cur_word = new Word(new_word);
+				this.words.push(cur_word);
+				this.dom_root.appendChild(cur_word.dom);
+				this.invalidate_height();
+				continue;
+			}
+			if (this.words[i].text != new_word) {
+				this.words[i].text = new_word;
+				this.invalidate_height();
+			}
+		}
+	}
+
+	public async animate(): Promise<void> {
+		for (const word of this.words) {
+			await word.show();
+		}
+		await sleep(Paragraph.WORD_ANIM_POST_WAIT);
+	}
+
+	private calculate_height(): void {
+		this.height = this.dom_root.getBoundingClientRect().height;
+	}
+
+	public get real_height(): number {
+		if (!this.height_current) {
+			this.calculate_height();
+			this.height_current = true;
+		}
+		return this.height;
+	}
+
+	public subtleize(): Promise<void> {
+		this.set_color(Paragraph.SUBTLE_COLOR);
+		return sleep(500);
+	}
+
+	public async show(): Promise<void> {
+		if (this.visible) { return; }
+		this.dom_root.style.opacity = "1";
+		return sleep(500);
+	}
+
+	public set translate_y(value: number) {
+		this.vertical_position = value;
+		this.dom_root.style.transform = `translateY(${value}px)`;
+	}
+
+	public get translate_y(): number {
+		return this.vertical_position;
+	}
+
+	public get dom(): HTMLDivElement {
+		return this.dom_root;
+	}
+}
+
+export class ScrollingTextBox {
+	private dom_root: HTMLDivElement;
+
+	private paragraphs: Paragraph[];
+
+	private static MAX_HEIGHT: number = 650;
+	private static CENTER_HEIGHT: number = 350;
+	private static VERTICAL_MARGIN: number = 10;
+
+	public constructor() {
+		this.dom_root = el.div([], ["scrolling-textbox"]);
+		this.paragraphs = [];
+	}
+
+	private add_paragraph(initial_text: string | null): void {
+		const new_paragraph = new Paragraph(initial_text);
+		new_paragraph.translate_y = ScrollingTextBox.CENTER_HEIGHT;
+		this.paragraphs.push(new_paragraph);
+		this.dom_root.appendChild(new_paragraph.dom);
+	}
+
+	private add_paragraph_bottom(initial_text: string): void {
+		if (this.paragraphs.length == 0) {
+			this.add_paragraph(initial_text);
+			return;
+		}
+		const most_bottom = this.paragraphs[this.paragraphs.length - 1];
+		const offset = most_bottom.translate_y + most_bottom.real_height;
+		const new_paragraph = new Paragraph(initial_text);
+		new_paragraph.translate_y = offset;
+		this.paragraphs.push(new_paragraph);
+		this.dom_root.appendChild(new_paragraph.dom);
+	}
+
+	/**
+	 * Remove all paragraphs up to (not including) a certain index.
+	*/
+	private trim_to(exclusive_end: number): void {
+		const spliced = this.paragraphs.splice(0, exclusive_end);
+		for (const item of spliced) {
+			this.dom_root.removeChild(item.dom);
+		}
+	}
+
+	/**
+	 * Run scroll animation on the first element and then pop it off of the DOM.
+	 */
+	private async scroll_trim(offset: number): Promise<void> {
+		const to_trim = this.paragraphs.shift();
+		if (to_trim === undefined) { return; }
+		to_trim.translate_y = offset;
+		await sleep(500);
+		this.dom_root.removeChild(to_trim.dom);
+	}
+
+	/**
+	 * Update elements DOM scrolls and wait for animations to complete.
+	 *
+	 * Note that this will remove any paragraphs that aren't visible anymore.
+	*/
+	private async update_scroll(): Promise<void> {
+		if (this.paragraphs.length == 0) { return; }
+		const last = this.paragraphs[this.paragraphs.length - 1];
+		let offset = Math.min(
+			ScrollingTextBox.MAX_HEIGHT - last.real_height, ScrollingTextBox.CENTER_HEIGHT
+		);
+		last.translate_y = offset;
+		if (this.paragraphs.length == 1) { return; }
+		for (let i = this.paragraphs.length - 2; i >= 0; --i) {
+			offset -= ScrollingTextBox.VERTICAL_MARGIN;
+			const cur = this.paragraphs[i];
+			if (offset <= 0) {
+				this.trim_to(i);
+				this.scroll_trim(offset - cur.real_height);
+				break;
+			}
+			offset -= cur.real_height;
+			cur.translate_y = offset;
+		}
+		await sleep(500);
+	}
+
+	public async update_current(text: string): Promise<void> {
+		if (this.paragraphs.length == 0) {
+			this.add_paragraph(null);
+			this.update_scroll();
+		}
+		const current = this.paragraphs[this.paragraphs.length - 1];
+		current.set_text(text);
+		await wait_for_dom_refresh();
+		await Promise.all([this.update_scroll(), current.animate()]);
+	}
+
+	public async finish_current(text: string): Promise<void> {
+		if (this.paragraphs.length == 0) {
+			this.add_paragraph(text);
+		}
+		const current = this.paragraphs[this.paragraphs.length - 1];
+		current.set_text(text);
+		this.add_paragraph(null);
+		await Promise.all([this.update_scroll(), current.subtleize(), current.animate()]);
+	}
+
+	public async add_line(text: string): Promise<void> {
+		if (this.paragraphs.length != 0) {
+			this.paragraphs[this.paragraphs.length - 1].subtleize();
+		}
+		this.add_paragraph_bottom(text);
+		await wait_for_dom_refresh();
+		await Promise.all([
+			this.update_scroll(),
+			this.paragraphs[this.paragraphs.length - 1].show(),
+		]);
 	}
 
 	public get dom(): HTMLDivElement {

client/settings.ts

@@ -4,7 +4,9 @@ export namespace dict {
 }
 
 export const IDLE_LOGOS: string[] = [
+	"files/tul_logo.svg",
 	"files/fm_logo.svg",
+	"files/zmp_logo.svg",
 ];
 
 export const QUESTION_QR: string = "files/qr_ask.svg";

client/style.scss

@@ -1,5 +1,12 @@
 @use "sass:color";
 
+#run {
+  width: 100%;
+  height: 100vh;
+  background-color: transparent;
+  border: none;
+}
+
 body {
   font-family: Arial;
   background-color: black;
@@ -19,14 +26,14 @@ body {
 
   h1 {
     transition: .5s ease transform, .5s ease opacity;
+    font-size: 3em;
     opacity: 0;
     transform: translateY(-100%);
   }
 
   h2 {
     transition: .5s ease opacity;
-    color: grey;
-    font-size: 1em;
+    color: color.scale(white, $lightness: -25%);
     margin: 0;
     opacity: 0;
     font-weight: normal;
@@ -34,16 +41,23 @@ body {
 
   .logos {
     display: flex;
-    margin-top: 10em;
-    width: 40rem;
+    margin-top: 15em;
     justify-content: center;
+    align-items: center;
 
     .logo {
+      display: flex;
+      align-items: center;
       transition: .5s ease-out transform, .5s ease-out opacity;
-      width: 15em;
+      height: 7em;
       transform: translateY(100%);
       opacity: 0;
-      margin: 0 1em;
+      margin: 0 2em;
+
+      img {
+        max-height: 100%;
+        max-width: 25em;
+      }
     }
   }
 }
@@ -63,6 +77,15 @@ body {
 .main {
   transition: .5s ease opacity;
   opacity: 0;
+
+  .disclaimer {
+    color: color.adjust(white, $lightness: -40%);
+    position: absolute;
+    bottom: 0;
+    left: 50%;
+    transform: translateX(-50%);
+    font-size: 1.5em;
+  }
 }
 
 .question {
@@ -120,14 +143,18 @@ body {
   -ms-overflow-style: none;
   scrollbar-width: none;
   width: 100%;
+  height: 650px;
 
   .paragraph {
     transition: .5s ease color, .5s ease transform, .5s ease opacity;
+    position: absolute;
     display: flex;
     font-size: $line-height;
     flex-wrap: wrap;
     margin: 0;
+    top: 0;
     transform: translateY(0);
+    height: fit-content;
     width: 100%;
     max-width: 100%;
 

client/tools.ts

@@ -31,6 +31,43 @@ export async function sleep(millis: number): Promise<void> {
 	});
 }
 
+export function wait_for_dom_refresh(): Promise<void> {
+	return new Promise<void>((resolver) => {
+		requestAnimationFrame(() => {
+			requestAnimationFrame(() => {
+				resolver();
+			});
+		});
+	});
+}
+
+/**
+ * Provides a locking abstraction around any ref-passed object to provide inner mutability that can
+ * automatically release on promise resolution. This provides "atomic transactions" on the inner
+ * type.
+ *
+ * This allows you to not await the transaction result, but offload the waiting to the next call
+ * to run. So other tasks can normally run when the transaction is executing. And if the inner
+ * type is needed again... the run call will wait for the (possibly) running transaction to
+ * finish first.
+ */
+export class AsyncRunner<T> {
+	private inner: T;
+	private lock: Promise<void>;
+
+	public constructor(inner: T) {
+		this.inner = inner;
+		this.lock = Promise.resolve();
+	}
+
+	public async run(transaction: (target: T) => Promise<void>): Promise<void> {
+		await this.lock;
+		this.lock = new Promise((resolver) => {
+			transaction(this.inner).then(() => { resolver() });
+		});
+	}
+}
+
 export namespace el {
 	function add_classes(target: HTMLElement, classes?: string[]): void {
 		if (classes === undefined) { return; }

main.py

@@ -1,3 +1,18 @@
+# This file is part of Pythagoras.
+#
+# Pythagoras 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.
+#
+# Pythagoras 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.
+#
+# You should have received a copy of the GNU General Public License
+# along with Pythagoras. If not, see <https://www.gnu.org/licenses/>.
+
 from fastapi import FastAPI, File, Request, WebSocket, WebSocketDisconnect, BackgroundTasks, HTTPException
 from fastapi.responses import JSONResponse, FileResponse
 import logging
@@ -13,7 +28,7 @@ from pathlib import Path
 from asyncio import Lock
 
 # Some useful variables
-PEEHAITCHPEA_ENDPOINT = "http://localhost:9000/api.php?cmd=getselectedmessage"
+PEEHAITCHPEA_ENDPOINT = "http://peehaitchpea.libre-liberec.cz/api.php?cmd=getselectedmessage"
 PYTHAGORAS_PORT = 8000
 
 # Configure logging
@@ -344,8 +359,9 @@ async def fetch_selected_message():
     Fetches a selected message from the specified endpoint.
     Returns the message as a string or None if no message is available.
     """
+    auth = httpx.BasicAuth(username="stallman", password="gnu")
     try:
-        async with httpx.AsyncClient() as client:
+        async with httpx.AsyncClient(auth=auth) as client:
             response = await client.get(PEEHAITCHPEA_ENDPOINT)
             if response.status_code == 200:
                 message = response.text.strip()