docker: add build/run Dockerfile

The image builds Vatu and can run it on Lichess.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "external/lichess-bot"]
+	path = external/lichess-bot
+	url = https://github.com/ShailChoksi/lichess-bot.git

README.md

@@ -1,13 +1,81 @@
 Vatu
 ====
 
-Dumb chess engine written in Rust for fun. Supports UCI.
+Dumb chess engine written in Rust for fun.
+
+
+
+Features
+--------
+
+- [UCI][cpw-uci]
+- Barely optimized board, position and moves representations
+- Simple [negamax][cpw-negamax] for node evaluation
+- [Alpha-beta][cpw-ab] search tree pruning for speeding searches
+
+[cpw-uci]: https://www.chessprogramming.org/UCI
+[cpw-negamax]: https://www.chessprogramming.org/Negamax
+[cpw-ab]: https://www.chessprogramming.org/Alpha-Beta
+
+Last time I checked it ran approximately at 10000 nps.
+
+Thanks to UCI the bot can run with most compatible software; [Cutechess][cc] has
+been used for testing.
+
+[cc]: https://github.com/cutechess/cutechess
+
+
+
+Usage
+-----
+
+### Build
+
+With Cargo:
+
+```bash
+cargo build --release
+```
+
+With Docker, to avoid setting up a Rust toolchain:
+
+```bash
+docker build -f res/docker/Dockerfile -t vatu-builder --target builder .
+docker create vatu-builder  # Returns a container ID.
+docker cp <id>:/src/target/release/vatu .
+docker rm <id>
+docker rmi vatu-builder
+```
+
+### Run
+
+If you built it with Cargo, the binary is in `target/release`.
+
+```bash
+./vatu
+```
+
+To run your own instance of the bot on Lichess (why would you do that?), create
+a bot account and get an OAuth token. Then using the full Docker image:
+
+```bash
+# Fetch the lichess-bot submodule.
+git submodule update --init --recursive
+# Copy the config.yml template to your own copy and modify it.
+cp external/lichess-bot/config.yml.example /tmp/vatu-config/config.yml
+# Build the image. Make sure config.yml is not there to not embed it!
+docker build -f res/docker/Dockerfile -t vatu .
+# Run with the config folder mounted at /config.
+docker run -v /tmp/vatu-config:/config -ti vatu
+```
 
 
 
 TODO
 ----
 
-- Support time constraints on "go" commands.
-- Precompute knight and maybe other pieces moves.
-- Some Alpha-beta in terribly slow best move calculation.
+- Support time constraints
+- Proper unmake mechanism instead of allocating boards like there is no tomorrow
+- Precompute knight some pieces moves, maybe
+- Transposition table that does not actually slows search down
+- Multithreading (never)

external/lichess-bot

@@ -0,0 +1 @@
+Subproject commit 72d5eb1431e24935aad4cf12b86ca7af27d0491a

res/docker/Dockerfile

@@ -0,0 +1,14 @@
+# Build engine.
+FROM rust:1 AS builder
+COPY . /src
+WORKDIR /src
+RUN cargo build --release
+
+# Run on a Lichess account.
+FROM python:3
+COPY . /vatu
+WORKDIR /vatu/external/lichess-bot
+RUN ls -l
+RUN pip install -r requirements.txt
+COPY --from=builder /src/target/release/vatu engines/
+ENTRYPOINT ["bash"]

src/main.rs

@@ -1,6 +1,4 @@
-use std::process;
-
-use clap::{App, AppSettings, Arg, ArgMatches, SubCommand};
+use clap::{App, Arg};
 
 pub mod analysis;
 pub mod board;
@@ -14,27 +12,16 @@ pub mod stats;
 pub mod uci;
 
 fn main() {
-    let matches = App::new("Vatu")
-        .setting(AppSettings::ArgRequiredElseHelp)
-        .subcommand(SubCommand::with_name("uci")
-            .about("Start engine in UCI mode")
+    let args = App::new("Vatu")
         .arg(Arg::with_name("debug")
             .help("Enable debug mode")
             .short("d").long("debug").takes_value(false).required(false))
         .arg(Arg::with_name("log_file")
             .help("Log file path (default is stderr)")
-                .long("log-file").takes_value(true).required(false)))
+            .long("log-file").takes_value(true).required(false))
         .get_matches();
 
-    process::exit(match matches.subcommand() {
-        ("uci", Some(a)) => cmd_uci(a),
-        _ => 0,
-    })
-}
-
-fn cmd_uci(args: &ArgMatches) -> i32 {
     let debug = args.is_present("debug");
     let output = args.value_of("log_file");
     uci::Uci::start(debug, output);
-    0
 }