Basic renrs-gui implementation

.vscode/settings.json

@@ -1,5 +1,7 @@
 {
     "rust-analyzer.linkedProjects": [
+        "./renrs/Cargo.toml",
+        "./renrs-gui/Cargo.toml",
         "./demo/Cargo.toml"
     ],
     "files.exclude": {

Cargo.lock

@@ -0,0 +1,205 @@
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+]
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+ "pest_derive",
+]
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README.md

@@ -0,0 +1,13 @@
+# renrs
+
+*(Work in progress 🚧)*
+
+renrs (name subject to change) is a visual novel and dialog engine written in Rust. It is fully compatible with [Ren'Py language `.rpy` scripts](https://www.renpy.org/doc/html/language_basics.html), letting you migrate easily. The core engine is logic only, so you are free to integrate it into whatever front-end framework or game engine you like. If you are creating a simple visual novel with no complex gameplay elements, you can use renrs's official GUI to have an all-in-one engine solution. If you want to use renrs as a dialog system in a full game engine, you can use renrs's official Godot integration.
+
+### Modules
+
+- **WIP** `renrs` is the core engine and Ren'Py script interpreter.
+- **PLANNED** `renrs-gui` is a graphics layer for simple visual novels.
+- **PLANNED** `renrs-editor` is a route viewer and theme editor for `renrs-gui`.
+- **PLANNED** `renrs-godot` is an integration for Godot for more advanced projects.
+- **PLANNED** `renrs-hub` is a launcher for visual novels made in `renrs-gui`.

demo/Cargo.toml

@@ -6,4 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-renrs = { path = ".." }
+renrs-gui = { path = "../renrs-gui" }

demo/demo.rpy

@@ -1,3 +1,3 @@
 "Bob sat on the bench."
 "Bob" "Good morning!"
-eat
+eat "potato"

demo/src/main.rs

@@ -1,6 +1,3 @@
 fn main() {
-    let commands = renrs::parse_file("demo.rpy");
-    for command in commands {
-        println!("{:?}", command);
-    }
+    renrs_gui::run("demo.rpy".into()).unwrap();
 }

renrs-gui/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "renrs-gui"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+eframe = "0.21.3"
+env_logger = "0.10.0"
+renrs = { path = "../renrs" }

renrs-gui/src/lib.rs

@@ -0,0 +1,60 @@
+use std::path::PathBuf;
+
+use eframe::egui;
+use egui::*;
+use renrs::{State, Command};
+
+pub fn run(file: PathBuf) -> Result<(), eframe::Error> {
+    env_logger::init();
+    let options = eframe::NativeOptions {
+        initial_window_size: Some(egui::vec2(640.0, 480.0)),
+        resizable: false, // prevent i3 from automatically resizing
+        ..Default::default()
+    };
+    eframe::run_native(
+        "renrs-gui", 
+        options,
+        Box::new(|_cc| Box::new(
+            App::from_state(State::from_file(file))
+        )),
+    )
+}
+
+struct App {
+    state: State,
+    text: String,
+}
+
+impl App {
+    fn from_state(state: State) -> Self {
+        let mut app = Self {
+            state,
+            text: "".to_owned(),
+        };
+        app.next();
+        app
+    }
+
+    fn next(&mut self) {
+        if let Some(Command::Say { name, text }) = self.state.next_command() {
+            self.text = match name {
+                Some(name) => format!("{name}: {text}"),
+                None => text,
+            }
+        }
+    }
+}
+
+impl eframe::App for App {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        egui::CentralPanel::default().show(ctx, |ui| {
+            if ctx.input(|i|
+                i.key_pressed(Key::Space)
+                || i.pointer.button_clicked(PointerButton::Primary)
+            ) {
+                self.next();
+            }
+            ui.label(&self.text);
+        });
+    }
+}

renrs/.gitignore

@@ -0,0 +1,2 @@
+/target
+Cargo.lock

renrs/src/lib.rs

@@ -1,4 +1,4 @@
-use std::fs;
+use std::{fs, path::PathBuf};
 
 use pest::Parser;
 use pest_derive::Parser;
@@ -33,7 +33,10 @@ pub enum Command {
     Say {
         name: Option<String>,
         text: String,
-    }
+    },
+    Eat {
+        food: String,
+    },
 }
 
 use Command::*;
@@ -43,6 +46,7 @@ fn tokenize(script: &str) -> Vec<Vec<Token>> {
     let file = RpyParser::parse(Rule::file, script)
         .expect("unsuccessful parse")
         .next().unwrap();
+    // TODO: Init with capacity
     let mut lines = Vec::new();
     for line in file.into_inner() {
         let mut tokens = Vec::new();
@@ -94,7 +98,7 @@ fn parse_pair(pair: pest::iterators::Pair<Rule>) -> Token {
 }
 
 // Tokenize file
-fn tokenize_file(file_path: &str) -> Vec<Vec<Token>> {
+fn tokenize_file(file_path: PathBuf) -> Vec<Vec<Token>> {
     let unparsed_file = fs::read_to_string(file_path).expect("cannot find file");
     tokenize(&unparsed_file)
 }
@@ -111,11 +115,10 @@ fn describe_line(line: &Vec<Token>) -> String {
 }
 
 // Parse file into commands
-pub fn parse_file(file_path: &str) -> Vec<Command> {
+fn parse_file(file_path: PathBuf) -> Vec<Command> {
     let token_lines = tokenize_file(file_path);
     let mut commands = Vec::new();
     for line in token_lines {
-        println!("{:?}", line);
         commands.push(match line.as_slice() {
             [Str(text)] => Say {
                 name: None,
@@ -125,8 +128,35 @@ pub fn parse_file(file_path: &str) -> Vec<Command> {
                 name: Some(name.to_owned()),
                 text: text.to_owned(),
             },
+            [Keyword(keyword), Str(food)] if keyword.eq("eat") => Eat {
+                food: food.to_owned(),
+            },
             _ => panic!("Unknown command {}", describe_line(&line)),
         });
     }
     commands
 }
+
+pub struct State {
+    command_queue: Vec<Command>,
+}
+
+impl State {
+    pub fn from_file(file: PathBuf) -> State {
+        State {
+            command_queue: {
+                let mut q = parse_file(file);
+                q.reverse();
+                q
+            },
+        }
+    }
+
+    pub fn next_command(&mut self) -> Option<Command> {
+        if self.command_queue.len() == 0 {
+            None
+        } else {
+            Some(self.command_queue.remove(self.command_queue.len() - 1))
+        }
+    }
+}

shell.nix

@@ -9,13 +9,33 @@ let
       "rust-src"
     ];
   });
-in
-pkgs.mkShell {
-  buildInputs = with pkgs; [
+in with pkgs;
+mkShell {
+  buildInputs = [
     ruststable
     rust-analyzer
     bacon
     #pkg-config
     #openssl
   ];
+
+  # Shell configuration for egui/eframe
+  # Based on https://gist.github.com/TheSirC/8fc34ba9143c8fe4f0b1962f4d7225df
+  # Will fail to find library otherwise
+
+  nativeBuildInputs = with xorg; [
+    libxcb
+    libXcursor
+    libXrandr
+    libXi
+    pkg-config
+  ] ++ [
+    #python3
+    libGL
+    libGLU
+  ];
+
+  shellHook = ''
+      export LD_LIBRARY_PATH=/run/opengl-driver/lib/:${lib.makeLibraryPath ([libGL libGLU])}
+  '';
 }