began writing it properly

.replit

@@ -1,20 +0,0 @@
-run = "cargo run"
-hidden = ["target"]
-
-[packager]
-language = "rust"
-
-[packager.features]
-packageSearch = true
-
-[languages.rust]
-pattern = "**/*.rs"
-
-[languages.rust.languageServer]
-start = "rust-analyzer"
-
-[nix]
-channel = "stable-22_05"
-
-[gitHubImport]
-requiredFiles = [".replit", "replit.nix"]

docs/design/introduction.md

@@ -0,0 +1,18 @@
+# Introduction
+Velocity is a fast and hackable text editor made for programming. It is split into two main parts, the backend and the frontend.
+The backend, written in performant Rust, is the core of the editor and handles text manipulation, files, buffers, views, etc.
+The frontend, which can be written in any language, is the UI of the editor and handles rendering, keybinds, etc.
+
+## Editor
+The `struct Editor` is the main class of the backend. It contains the current state of the editor, the views, and the configuration.
+The `Editor` is the main way to interact with the backend, and is used by the frontend to manipulate the editor.
+
+## View
+The `struct View` defines a way of viewing a buffer, it contains information such as the current cursor locations, the scroll position, and the buffer
+
+## Buffer
+The `struct Buffer` contains the text of a file, and is the main way of interacting with the text. It contains a `Vec` of `Line`s, which contain a `Vec` of `char`s.
+Buffers can be `BufferKind::Read`, meaning the file is read-only, or `BufferKind::Write` allowing edits to be made to the file, or can be `BufferKind::Scratch` which are not associated with a file.
+
+## Line
+The `struct Line` contains a `Vec` of `char`s, and is the main way of interacting with the text. It contains a `Vec` of `Line`s, which contain a `Vec` of `char`s.

replit.nix

@@ -1,9 +0,0 @@
-{ pkgs }: {
-	deps = [
-		pkgs.rustc
-		pkgs.rustfmt
-		pkgs.cargo
-		pkgs.cargo-edit
-        pkgs.rust-analyzer
-	];
-}

src/core.rs

@@ -0,0 +1,5 @@
+pub mod editor;
+mod buffer;
+mod languages;
+mod config;
+mod files;

src/core/buffer.rs

@@ -1,37 +1,61 @@
-use std::path::PathBuf;
+use std::error::Error;
+use crate::core::languages::Language;
+use crate::core::files;
 
-#[derive(PartialEq)]
-pub enum BufferKind {
-    Scratch,
-    Write,
+enum BufferKind {
     Read,
+    Write,
+    Scratch,
 }
 
 impl BufferKind {
     pub fn as_str(&self) -> &str {
         match self {
-            BufferKind::Scratch => "*scratch*",
-            BufferKind::Write => "write",
             BufferKind::Read => "read",
+            BufferKind::Write => "write",
+            BufferKind::Scratch => "*scratch*",
         }
     }
 }
 
-pub struct Buffer<'a> {
-    pub data: Vec<String>,
-    pub path: PathBuf,
-    pub kind: BufferKind,
-    pub name: &'a str,
+// An file that is open in the editor
+pub struct Buffer {
+    kind: BufferKind,
+    lines: Vec<String>,
+    filename: Option<String>,
+    language: Language,
 }
 
-impl<'a> Buffer<'a> {
-    pub fn new(path: PathBuf, name: &'a str, kind: BufferKind) -> Self {
-        // Return a buffer
-        Self {
-            data: vec![String::from("")],
-            path,
-            kind,
-            name,
+impl Buffer {
+    pub fn new(path: Option<String>) -> Result<Self, Box<dyn Error>> {
+        // If the file exists, read it into the buffer
+        if let Some(path) = path {
+            // Read the file
+            let lines = files::read_file(path.clone())?;
+
+            // Get the language
+            let language = Language::get_language(&path);
+
+            // Check if the file is writeable
+            let kind = if std::path::Path::new(&path).is_file() {
+                BufferKind::Write
+            } else {
+                BufferKind::Read
+            };
+
+            Ok(Self {
+                kind,
+                lines,
+                filename: Some(path),
+                language,
+            })
+        } else {
+            Ok(Self {
+                kind: BufferKind::Scratch,
+                lines: Vec::new(),
+                filename: None,
+                language: Language::PlainText,
+            })
         }
     }
-}
+}

src/core/config.rs

@@ -0,0 +1,19 @@
+const VERSION: Option<&str> = option_env!("CARGO_PKG_VERSION");
+
+pub struct Config {
+    name: &'static str,
+    version: &'static str,
+    logo: &'static str,
+    motto: &'static str,
+}
+
+impl Config {
+    pub fn new() -> Self {
+        Self {
+            name: "Velocity",
+            version: VERSION.unwrap_or("UNKNOWN"),
+            logo: "λ",
+            motto: "Hackable text editor for nerds.",
+        }
+    }
+}

src/core/editor.rs

@@ -1,55 +1,22 @@
-use std::path::PathBuf;
 use crate::core::buffer::Buffer;
-use crate::core::buffer::BufferKind;
+use crate::core::config::Config;
+use std::error::Error;
 
-pub struct Config<'a> {
-    pub logo: &'a str,
-    pub friendly_name: &'a str,
+pub struct Editor {
+    buffers: Vec<Buffer>,
+    config: Config,
 }
 
-impl<'a> Config<'a> {
+impl Editor {
     pub fn new() -> Self {
         Self {
-            logo: "λ",
-            friendly_name: "Velocity",
-        }
-    }
-}
-
-#[allow(dead_code)]
-pub enum Mode {
-    Normal,
-    Insert,
-    Select,
-    Command,
-}
-
-impl Mode {
-    pub fn as_str(&self) -> &str {
-        match self {
-            Mode::Normal => "NORMAL",
-            Mode::Insert => "INSERT",
-            Mode::Select => "SELECT",
-            Mode::Command => "COMMAND",
-        }
-    }
-}
-
-pub struct Editor<'a> {
-    pub config: Config<'a>,
-    pub buffer: Box<Buffer<'a>>,
-    pub cursors: Vec<i32>,
-    pub mode: Mode,
-}
-
-impl<'a> Editor<'a> {
-    pub fn new(path: PathBuf, buffer_name: &'a str) -> Self {
-        let buffer_kind = if path.to_str().unwrap().len() > 1 { BufferKind::Write } else { BufferKind::Scratch };
-        Editor {
+            buffers: Vec::new(),
             config: Config::new(),
-            buffer: Box::new(Buffer::new(path, buffer_name, buffer_kind)),
-            cursors: Vec::from([0]),
-            mode: Mode::Normal,
         }
     }
-}
+
+    pub fn attach_file(&mut self) -> Result<(), Box<dyn Error>> {
+        self.buffers.push(Buffer::new(None)?);
+        Ok(())
+    }
+}

src/core/files.rs

@@ -0,0 +1,9 @@
+use std::error::Error;
+
+pub fn read_file(path: String) -> Result<Vec<String>, Box<dyn Error>> {
+    let contents: String = std::fs::read_to_string(path)?;
+    let lines: Vec<String> = contents.lines()
+        .map(|s| s.to_owned())
+        .collect();
+    Ok(lines)
+}

src/core/languages.rs

@@ -0,0 +1,31 @@
+pub enum Language {
+    Rust,
+    Python,
+    Markdown,
+    PlainText,
+}
+
+impl Language {
+    pub fn as_str(&self) -> &str {
+        match self {
+            Language::Rust => "rust",
+            Language::Python => "python",
+            Language::Markdown => "markdown",
+            Language::PlainText => "plain text",
+        }
+    }
+
+    pub fn get_language(filename: &str) -> Self {
+        let extension = std::path::Path::new(filename)
+            .extension()
+            .and_then(|s| s.to_str())
+            .unwrap_or("");
+
+        match extension {
+            "rs" => Language::Rust,
+            "py" => Language::Python,
+            "md" => Language::Markdown,
+            _ => Language::PlainText,
+        }
+    }
+}

src/core/mod.rs

@@ -1,2 +0,0 @@
-pub mod editor;
-pub mod buffer;

src/main.rs

@@ -1,25 +1,6 @@
 mod core;
-mod terminal;
-mod tui;
-use std::{env, path::PathBuf};
 
 fn main() {
-    // Collect command line arguments
-    let args: Vec<String> = env::args().collect();
-
-    // Collect the file path
-    let file_path = if args.len() > 1 { PathBuf::from(&args[1]) } else { PathBuf::from("") };
-
-    // Collect the file name
-    let file_name = file_path.clone();
-    let file_name = if args.len() > 1 { file_name.file_name().unwrap().to_str().unwrap() } else { "" };
-
-    // Initalise a new editor
-    let velocity = core::editor::Editor::new(file_path, file_name);
-
-    // Initalise a screen
-    let mut screen = terminal::screen::Screen::new().unwrap();
-
-    // Begin lambda
-    tui::ui::start(&mut screen, velocity);
-}
+    let mut editor = core::editor::Editor::new();
+    editor.attach_file().unwrap();
+}

src/terminal/mod.rs

@@ -1 +0,0 @@
-pub mod screen;

src/terminal/screen.rs

@@ -1,154 +0,0 @@
-use crossterm::cursor::{Hide, MoveTo, Show};
-use crossterm::style::Print;
-use crossterm::terminal;
-use crossterm::{execute, ErrorKind};
-use std::io::stdout;
-
-// Struct for holding coordinates
-#[derive(Copy, Clone)]
-pub struct Coords {
-    pub x: usize,
-    pub y: usize,
-}
-
-// Creating a coordinates from two values
-impl Coords {
-    pub fn from(x: usize, y: usize) -> Self {
-        Self { x, y }
-    }
-}
-
-// A cursor for writing to the terminal screen
-#[derive(Copy, Clone)]
-pub struct Cursor {
-    pub position: Coords,
-    pub hidden: bool,
-}
-
-// When a cursor is created
-impl Cursor {
-    pub fn new() -> Result<Self, ErrorKind> {
-        let mut cursor = Self {
-            position: Coords::from(0, 0),
-            hidden: true,
-        };
-        Cursor::move_to(&mut cursor, Coords::from(0, 0));
-        Cursor::hide(&mut cursor);
-        Ok(cursor)
-    }
-}
-
-// Cursor methods
-impl Cursor {
-    pub fn move_to(&mut self, position: Coords) {
-        // Set the new position of the cursor
-        self.position = position;
-
-        // Move the cursor to the desired posiition in the terminal
-        execute!(stdout(), MoveTo(position.x as u16, position.y as u16)).unwrap();
-    }
-
-    pub fn hide(&mut self) {
-        // Remember that the cursor is hidden
-        self.hidden = true;
-
-        // Hide the cursor from the terminal screen
-        execute!(stdout(), Hide).unwrap();
-    }
-
-    pub fn show(&mut self) {
-        // Remember that the cursor isn't hidden
-        self.hidden = false;
-
-        // Show the cursor to the terminal screen
-        execute!(stdout(), Show).unwrap();
-    }
-}
-
-// A struct for holding the size of the terminal
-pub struct Size {
-    pub width: usize,
-    pub height: usize,
-}
-
-// The terminal screen
-pub struct Screen {
-    pub size: Size,
-    pub cursor: Cursor,
-}
-
-// For when a new terminal screen is created
-impl Screen {
-    pub fn new() -> Result<Self, ErrorKind> {
-        // Get the size of the terminal
-        let size = terminal::size()?;
-
-        // Define a new terminal screen struct
-        let mut screen = Self {
-            size: Size {
-                width: size.0 as usize,
-                height: size.1 as usize,
-            },
-            cursor: Cursor::new().unwrap(),
-        };
-
-        // Empty the terminal screen
-        Screen::clear();
-
-        // Enter the terminal screen
-        screen.enter();
-
-        // Return a result containing the terminal
-        Ok(screen)
-    }
-}
-
-// Terminal functions and methods for managing the terminal
-impl Screen {
-    pub fn refresh(&mut self) -> Result<(), ErrorKind>{
-        // Clear the screen
-        Screen::clear();
-
-        // Update the screen dimensions
-        let size = terminal::size()?;
-        self.size.width = size.0 as usize;
-        self.size.height = size.1 as usize;
-
-        // Return Ok if was successful
-        Ok(())
-    }
-
-    pub fn enter(&mut self) {
-        // Hide the cursor
-        self.cursor.hide();
-
-        // Enter the terminal screen
-        terminal::enable_raw_mode().unwrap();
-        execute!(stdout(), terminal::EnterAlternateScreen).unwrap();
-    }
-
-    pub fn exit(&mut self) {
-        // Show the cursor
-        self.cursor.show();
-
-        // Exit the terminal screen
-        execute!(stdout(), terminal::LeaveAlternateScreen).unwrap();
-        terminal::disable_raw_mode().unwrap();
-    }
-
-    pub fn clear() {
-        // Clears the terminal screen
-        execute!(stdout(), terminal::Clear(terminal::ClearType::All)).unwrap();
-    }
-
-    pub fn write(text: &str) {
-        // Writes a line to a current cursor position
-        execute!(stdout(), Print(text)).unwrap();
-    }
-
-    pub fn write_at(&mut self, text: String, position: Coords) {
-        // Writes a line at a set of coordinates
-        self.cursor.move_to(position);
-        Screen::write(&text);
-    }
-}

src/tui/components/mod.rs

@@ -1,2 +0,0 @@
-pub mod statusbar;
-pub mod welcome;

src/tui/components/statusbar.rs

@@ -1,63 +0,0 @@
-use crossterm::style::Stylize;
-use crate::core::editor::Editor;
-use crate::terminal::screen::{Coords, Screen};
-use crate::tui::utils;
-
-pub fn draw(screen: &mut Screen, editor: &Editor) -> Result<(), ()> {
-    // Calculate where to draw the status bar
-    let status_height = screen.size.height - 2;
-
-    // Get the editor logo from the config
-    let editor_logo = &utils::with_spaces(editor.config.logo) as &str;
-    // Get the current mode into a string
-    let mode_string = &utils::with_spaces(editor.mode.as_str()) as &str;
-    // Get the current open file name
-    let file_name = &utils::with_spaces(editor.buffer.name) as &str;
-    // Get the current buffer kind
-    let buffer_kind = &utils::with_spaces(editor.buffer.kind.as_str()) as &str;
-
-    // Calculate the total length of all the status bar components
-    let total_length = editor_logo.len() + mode_string.len() + file_name.len() + buffer_kind.len() + 1;
-
-    // If the screen isn't wide enough, panic as we can't draw the status bar
-    if screen.size.width < total_length {
-        Err(())
-
-    } else {
-        // Write the editor logo
-        screen.write_at(
-            editor_logo.yellow().bold().reverse().to_string(),
-            Coords::from(0, status_height),
-        );
-
-        // Calculate where to write the current mode
-        let x = editor_logo.len() - 1;
-        // Write the current mode
-        screen.write_at(
-            mode_string.green().bold().reverse().to_string(),
-            Coords::from(x, status_height),
-        );
-
-        let x = x + mode_string.len();
-        // Draws the file name if it has a length, if not then it will draw the buffer type
-        if editor.buffer.name.len() > 0 {
-            screen.write_at(
-                file_name.magenta().bold().reverse().to_string(),
-                Coords::from(x, status_height),
-            );
-        } else {
-            screen.write_at(
-                buffer_kind.blue().bold().reverse().to_string(),
-                Coords::from(x, status_height),
-            );
-        }
-
-        let x = if editor.buffer.name.len() > 0 { x + file_name.len() } else { x + buffer_kind.len() };
-        screen.write_at(
-            " ".repeat(screen.size.width - x).reverse().to_string(),
-            Coords::from(x, status_height),
-        );
-
-        Ok(())
-    }
-}

src/tui/components/welcome.rs

@@ -1,39 +0,0 @@
-use crossterm::style::Stylize;
-use crate::core::editor::Editor;
-use crate::terminal::screen::{Coords, Screen};
-use crate::tui::utils;
-
-pub fn draw(screen: &mut Screen, editor: &Editor) {
-    // The welcome message
-    let title = format!("{} {}", editor.config.logo, editor.config.friendly_name);
-    let message: [&str; 5] = [
-        "Hackable text editor for nerds",
-        "",
-        "Type :help to open the README.md document",
-        "Type :o <file> to open a file and edit",
-        "Type :q! or <C-c> to quit the editor",
-    ];
-
-    // If the screen is big enough, we can draw
-    if screen.size.width > utils::longest_element_in_vec(message.to_vec()) && screen.size.height > message.len() + 4 {
-        // The starting y position in the centre of the screen
-        let mut y = (screen.size.height / 2) - (message.len() / 2) - 2;
-
-        // Calculate where to place the title
-        let x = utils::calc_centred_x(screen.size.width, title.len());
-
-        // Write the title to the screen
-        screen.write_at(title.yellow().to_string(), Coords::from(x, y));
-
-        for line in message {
-            // Each line has different width so requires a different x position to center it
-            let x = utils::calc_centred_x(screen.size.width, line.len()) ;
-
-            // For each line we move downwards so increment y
-            y += 1;
-
-            // Write the line to the screen at position (x, y)
-            screen.write_at(line.to_string(), Coords::from(x, y));
-        }
-    }
-}

src/tui/mod.rs

@@ -1,3 +0,0 @@
-pub mod ui;
-pub mod utils;
-mod components;

src/tui/ui.rs

@@ -1,38 +0,0 @@
-use crate::core::editor::Editor;
-use crate::core::buffer::BufferKind;
-use crate::terminal::screen::Screen;
-use crate::tui::components;
-use crossterm::event::{read, Event, KeyCode, KeyEvent, KeyModifiers};
-
-pub fn start(screen: &mut Screen, editor: Editor) {
-    // Main screen loop, runs until the program exits
-    loop {
-        // Refresh the screen
-        screen.refresh().unwrap();
-
-        // Draw the welcome message only if it is a scratch buffer
-        if editor.buffer.kind == BufferKind::Scratch {
-            components::welcome::draw(screen, &editor);
-        };
-
-        // Draw the status bar
-        components::statusbar::draw(screen, &editor).unwrap();
-
-        // Check for any key presses
-        match read().unwrap() {
-            Event::Key(KeyEvent {
-                code: KeyCode::Char('q'),
-                modifiers: KeyModifiers::CONTROL,
-                ..
-            }) => break,
-            Event::Key(KeyEvent {
-                code: KeyCode::Char('c'),
-                modifiers: KeyModifiers::CONTROL,
-                ..
-            }) => break,
-            _ => (),
-        }
-    }
-
-    screen.exit();
-}

src/tui/utils.rs

@@ -1,14 +0,0 @@
-// Surrounds a &str with spaces
-pub fn with_spaces(text: &str) -> String {
-    format!(" {} ", text)
-}
-
-// Calculates the starting x coordinate for centred text
-pub fn calc_centred_x(screen_width: usize, item_length: usize) -> usize {
-    (screen_width / 2) - (item_length / 2)
-}
-
-// Returns the longest element in a vector
-pub fn longest_element_in_vec(elements: Vec<&str>) -> usize {
-    elements.iter().max_by_key(|x: &&&str| x.len()).unwrap().len()
-}