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b/Cargo.toml new file mode 100644 index 0000000..3a62129 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,9 @@ +[package] +name = "hexapoda" +version = "0.1.0" +edition = "2024" + +[dependencies] +crossterm = "0.29.0" +itertools = "0.14.0" +ratatui = "0.29.0" diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..b284fcc --- /dev/null +++ b/src/main.rs @@ -0,0 +1,182 @@ +use std::{borrow::Cow, env, fs::File, io::Read, mem, process::exit}; +use crossterm::event::{self, Event}; +use itertools::Itertools; +use ratatui::{style::{Color, Style}, text::{Line, Span, Text}, widgets::Widget}; + +fn main() { + let mut app = App::init(); + let mut terminal = ratatui::init(); + + while !app.should_quit { + terminal.draw(|frame| { + frame.render_widget(&app, frame.area()) + }).unwrap(); + + app.handle_events(); + } + + ratatui::restore(); +} + +#[derive(Debug)] +struct App { + contents: Vec, + scroll_position: usize, + // cursor_position: usize, + should_quit: bool +} + +impl App { + fn init() -> App { + let input_files: Vec<_> = env::args().skip(1).collect(); + + if input_files.is_empty() { + println!("please provide at least one file as input"); + exit(1); + } + + assert!(input_files.len() == 1); + + let file_name = input_files.first().unwrap(); + + let file = File::open(file_name); + let mut contents = Vec::new(); + file.unwrap().read_to_end(&mut contents).unwrap(); + + App { + contents, + scroll_position: 0, + // cursor_position: 0, + should_quit: false, + } + } + + fn handle_events(&mut self) { + if matches!(event::read().unwrap(), Event::Key(_)) { + self.should_quit = true; + } + } +} + +const BYTES_PER_LINE: usize = 0x10; + +impl Widget for &App { + fn render(self, area: ratatui::prelude::Rect, buf: &mut ratatui::prelude::Buffer) { + let screen_end = self.scroll_position + BYTES_PER_LINE * (area.height as usize); + + let bytes_to_render = &self.contents[self.scroll_position..screen_end]; + + let (chunks, remainder) = bytes_to_render + .as_chunks::(); + + assert!(remainder.is_empty()); + + let lines: Vec<_> = chunks + .iter() + .map(render_line) + .collect(); + + let text = Text::from(lines); + + text.render(area, buf); + } +} + +fn render_line(bytes: &[u8; BYTES_PER_LINE]) -> Line { + let (chunks, remainder) = bytes.as_chunks::(); + + assert!(remainder.is_empty()); + + #[allow(unstable_name_collisions)] + let spans: Vec<_> = chunks + .iter() + .map(render_chunk) + .intersperse(vec![" ".into()]) + .flatten() + .collect(); + + Line::from(spans) +} + +const BYTES_PER_CHUNK: usize = 4; + +fn render_chunk(bytes: &[u8; BYTES_PER_CHUNK]) -> Vec> { + #[allow(unstable_name_collisions)] + bytes + .iter() + .copied() + .map(byte_as_span) + .intersperse(" ".into()) + .collect() +} + +trait HasCardinality { + const CARDINALITY: usize; +} + +impl HasCardinality for u8 { + const CARDINALITY: usize = 2usize.pow(u8::BITS); +} + +fn byte_as_span(byte: u8) -> Span<'static> { + const SPAN_FOR_BYTE: [Span; u8::CARDINALITY] = create_lookup_table(); + + SPAN_FOR_BYTE[byte as usize].clone() +} + +const fn create_lookup_table() -> [Span<'static>; u8::CARDINALITY] { + let mut result = [const { empty_span() }; u8::CARDINALITY]; + + let mut index = 0; + while index < u8::CARDINALITY { + result[index].style = style_for(index as u8); + mem::forget(mem::replace(&mut result[index].content, content_for(index as u8))); + index += 1; + } + + result +} + +const fn empty_span() -> Span<'static> { + Span { + style: Style::new(), + content: Cow::Borrowed("") + } +} + +const fn style_for(byte: u8) -> Style { + Style::new().fg(fg_for(byte)) +} + +const fn fg_for(byte: u8) -> Color { + match byte { + 0x00 => Color::Rgb(0xA0, 0xA0, 0xA0), // grey + 0x01..0x10 => Color::Rgb(0xFF, 0x71, 0xA9), // red + 0x10..0x20 => Color::Rgb(0xFF, 0x7A, 0x78), // salmon + 0x20..0x30 => Color::Rgb(0xFF, 0x81, 0x23), // red-orange + 0x30..0x40 => Color::Rgb(0xF7, 0x93, 0x00), // yellow-orange + 0x40..0x50 => Color::Rgb(0xE6, 0x9F, 0x00), // yellow + 0x50..0x60 => Color::Rgb(0xC1, 0xB2, 0x00), // green-yellow + 0x60..0x70 => Color::Rgb(0x82, 0xC6, 0x00), // lime + 0x70..0x80 => Color::Rgb(0x00, 0xD5, 0x00), // green + 0x80..0x90 => Color::Rgb(0x00, 0xD4, 0x59), // clover + 0x90..0xA0 => Color::Rgb(0x00, 0xD0, 0x91), // teal + 0xA0..0xB0 => Color::Rgb(0x00, 0xCC, 0xBB), // cyan + 0xB0..0xC0 => Color::Rgb(0x00, 0xC7, 0xDE), // light blue + 0xC0..0xD0 => Color::Rgb(0x00, 0xBE, 0xFF), // blue + 0xD0..0xE0 => Color::Rgb(0x6C, 0xAF, 0xFF), // blurple + 0xE0..0xF0 => Color::Rgb(0xB2, 0x98, 0xFF), // purple + 0xF0..0xFF => Color::Rgb(0xFF, 0x4D, 0xFF), // pink + 0xFF => Color::White + } +} + +const fn content_for(byte: u8) -> Cow<'static, str> { + Cow::Borrowed(byte_as_hex(byte)) +} + +const fn byte_as_hex(byte: u8) -> &'static str { + const LOOK_UP_TABLE: [&str; u8::CARDINALITY] = ["00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0A", "0B", "0C", "0D", "0E", "0F", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1A", "1B", "1C", "1D", "1E", "1F", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2A", "2B", "2C", "2D", "2E", "2F", "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3A", "3B", "3C", "3D", "3E", "3F", "40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4A", "4B", "4C", "4D", "4E", "4F", "50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5A", "5B", "5C", "5D", "5E", "5F", "60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "6A", "6B", "6C", "6D", "6E", "6F", "70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7A", "7B", "7C", "7D", "7E", "7F", "80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8A", "8B", "8C", "8D", "8E", "8F", "90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9A", "9B", "9C", "9D", "9E", "9F", "A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9", "AA", "AB", "AC", "AD", "AE", "AF", "B0", "B1", "B2", "B3", "B4", "B5", "B6", "B7", "B8", "B9", "BA", "BB", "BC", "BD", "BE", "BF", "C0", "C1", "C2", "C3", "C4", "C5", "C6", "C7", "C8", "C9", "CA", "CB", "CC", "CD", "CE", "CF", "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7", "D8", "D9", "DA", "DB", "DC", "DD", "DE", "DF", "E0", "E1", "E2", "E3", "E4", "E5", "E6", "E7", "E8", "E9", "EA", "EB", "EC", "ED", "EE", "EF", "F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7", "F8", "F9", "FA", "FB", "FC", "FD", "FE", "FF"]; + + LOOK_UP_TABLE[byte as usize] +}