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221 lines
12 KiB
Rust
221 lines
12 KiB
Rust
use crate::compositor::{Component, Compositor, Context, EventResult};
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use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
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use tui::{buffer::Buffer as Surface, text::Text};
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use std::{borrow::Cow, sync::Arc};
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use helix_core::{syntax, Position};
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use helix_view::{
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graphics::{Color, Rect, Style},
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Editor, Theme,
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};
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pub struct Markdown {
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contents: String,
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config_loader: Arc<syntax::Loader>,
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}
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// TODO: pre-render and self reference via Pin
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// better yet, just use Tendril + subtendril for references
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impl Markdown {
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pub fn new(contents: String, config_loader: Arc<syntax::Loader>) -> Self {
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Self {
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contents,
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config_loader,
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}
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}
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}
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fn parse<'a>(
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contents: &'a str,
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theme: Option<&Theme>,
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loader: &syntax::Loader,
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) -> tui::text::Text<'a> {
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use pulldown_cmark::{CodeBlockKind, CowStr, Event, Options, Parser, Tag};
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use tui::text::{Span, Spans, Text};
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// also 2021-03-04T16:33:58.553 helix_lsp::transport [INFO] <- {"contents":{"kind":"markdown","value":"\n```rust\ncore::num\n```\n\n```rust\npub const fn saturating_sub(self, rhs:Self) ->Self\n```\n\n---\n\n```rust\n```"},"range":{"end":{"character":61,"line":101},"start":{"character":47,"line":101}}}
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let text = "\n```rust\ncore::iter::traits::iterator::Iterator\n```\n\n```rust\nfn collect<B: FromIterator<Self::Item>>(self) -> B\nwhere\n Self: Sized,\n```\n\n---\n\nTransforms an iterator into a collection.\n\n`collect()` can take anything iterable, and turn it into a relevant\ncollection. This is one of the more powerful methods in the standard\nlibrary, used in a variety of contexts.\n\nThe most basic pattern in which `collect()` is used is to turn one\ncollection into another. You take a collection, call [`iter`](https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html) on it,\ndo a bunch of transformations, and then `collect()` at the end.\n\n`collect()` can also create instances of types that are not typical\ncollections. For example, a [`String`](https://doc.rust-lang.org/nightly/core/iter/std/string/struct.String.html) can be built from [`char`](type@char)s,\nand an iterator of [`Result<T, E>`](https://doc.rust-lang.org/nightly/core/result/enum.Result.html) items can be collected\ninto `Result<Collection<T>, E>`. See the examples below for more.\n\nBecause `collect()` is so general, it can cause problems with type\ninference. As such, `collect()` is one of the few times you'll see\nthe syntax affectionately known as the 'turbofish': `::<>`. This\nhelps the inference algorithm understand specifically which collection\nyou're trying to collect into.\n\n# Examples\n\nBasic usage:\n\n```rust\nlet a = [1, 2, 3];\n\nlet doubled: Vec<i32> = a.iter()\n .map(|&x| x * 2)\n .collect();\n\nassert_eq!(vec![2, 4, 6], doubled);\n```\n\nNote that we needed the `: Vec<i32>` on the left-hand side. This is because\nwe could collect into, for example, a [`VecDeque<T>`](https://doc.rust-lang.org/nightly/core/iter/std/collections/struct.VecDeque.html) instead:\n\n```rust\nuse std::collections::VecDeque;\n\nlet a = [1, 2, 3];\n\nlet doubled: VecDeque<i32> = a.iter().map(|&x| x * 2).collect();\n\nassert_eq!(2, doubled[0]);\nassert_eq!(4, doubled[1]);\nassert_eq!(6, doubled[2]);\n```\n\nUsing the 'turbofish' instead of annotating `doubled`:\n\n```rust\nlet a = [1, 2, 3];\n\nlet doubled = a.iter().map(|x| x * 2).collect::<Vec<i32>>();\n\nassert_eq!(vec![2, 4, 6], doubled);\n```\n\nBecause `collect()` only cares about what you're collecting into, you can\nstill use a partial type hint, `_`, with the turbofish:\n\n```rust\nlet a = [1, 2, 3];\n\nlet doubled = a.iter().map(|x| x * 2).collect::<Vec<_>>();\n\nassert_eq!(vec![2, 4, 6], doubled);\n```\n\nUsing `collect()` to make a [`String`](https://doc.rust-lang.org/nightly/core/iter/std/string/struct.String.html):\n\n```rust\nlet chars = ['g', 'd', 'k', 'k', 'n'];\n\nlet hello: String = chars.iter()\n .map(|&x| x as u8)\n .map(|x| (x + 1) as char)\n .collect();\n\nassert_eq!(\"hello\", hello);\n```\n\nIf you have a list of [`Result<T, E>`](https://doc.rust-lang.org/nightly/core/result/enum.Result.html)s, you can use `collect()` to\nsee if any of them failed:\n\n```rust\nlet results = [Ok(1), Err(\"nope\"), Ok(3), Err(\"bad\")];\n\nlet result: Result<Vec<_>, &str> = results.iter().cloned().collect();\n\n// gives us the first error\nassert_eq!(Err(\"nope\"), result);\n\nlet results = [Ok(1), Ok(3)];\n\nlet result: Result<Vec<_>, &str> = results.iter().cloned().collect();\n\n// gives us the list of answers\nassert_eq!(Ok(vec![1, 3]), result);\n```";
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let mut options = Options::empty();
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options.insert(Options::ENABLE_STRIKETHROUGH);
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let parser = Parser::new_ext(contents, options);
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// TODO: if possible, render links as terminal hyperlinks: https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda
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let mut tags = Vec::new();
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let mut spans = Vec::new();
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let mut lines = Vec::new();
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fn to_span(text: pulldown_cmark::CowStr) -> Span {
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use std::ops::Deref;
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Span::raw::<std::borrow::Cow<_>>(match text {
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CowStr::Borrowed(s) => s.to_string().into(), // could retain borrow
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CowStr::Boxed(s) => s.to_string().into(),
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CowStr::Inlined(s) => s.deref().to_owned().into(),
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})
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}
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let text_style = Style::default().fg(Color::Rgb(164, 160, 232)); // lavender
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let code_style = Style::default().fg(Color::Rgb(255, 255, 255)); // white
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let heading_style = Style::default().fg(Color::Rgb(219, 191, 239)); // lilac
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for event in parser {
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match event {
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Event::Start(tag) => tags.push(tag),
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Event::End(tag) => {
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tags.pop();
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match tag {
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Tag::Heading(_) | Tag::Paragraph | Tag::CodeBlock(CodeBlockKind::Fenced(_)) => {
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// whenever code block or paragraph closes, new line
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let spans = std::mem::take(&mut spans);
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if !spans.is_empty() {
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lines.push(Spans::from(spans));
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}
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lines.push(Spans::default());
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}
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_ => (),
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}
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}
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Event::Text(text) => {
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// TODO: temp workaround
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if let Some(Tag::CodeBlock(CodeBlockKind::Fenced(language))) = tags.last() {
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if let Some(theme) = theme {
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use helix_core::syntax::{self, HighlightEvent, Syntax};
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use helix_core::Rope;
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let rope = Rope::from(text.as_ref());
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let syntax = loader
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.language_config_for_scope(&format!("source.{}", language))
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.and_then(|config| config.highlight_config(theme.scopes()))
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.map(|config| Syntax::new(&rope, config));
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if let Some(mut syntax) = syntax {
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// if we have a syntax available, highlight_iter and generate spans
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let mut highlights = Vec::new();
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for event in syntax.highlight_iter(rope.slice(..), None, None, |_| None)
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{
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match event.unwrap() {
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HighlightEvent::HighlightStart(span) => {
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highlights.push(span);
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}
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HighlightEvent::HighlightEnd => {
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highlights.pop();
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}
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HighlightEvent::Source { start, end } => {
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let style = match highlights.first() {
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Some(span) => theme.get(&theme.scopes()[span.0]),
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None => text_style,
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};
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// TODO: replace tabs with indentation
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let mut slice = &text[start..end];
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// TODO: do we need to handle all unicode line endings
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// here, or is just '\n' okay?
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while let Some(end) = slice.find('\n') {
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// emit span up to newline
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let text = &slice[..end];
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let text = text.replace('\t', " "); // replace tabs
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let span = Span::styled(text, style);
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spans.push(span);
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// truncate slice to after newline
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slice = &slice[end + 1..];
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// make a new line
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let spans = std::mem::take(&mut spans);
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lines.push(Spans::from(spans));
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}
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// if there's anything left, emit it too
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if !slice.is_empty() {
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let span =
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Span::styled(slice.replace('\t', " "), style);
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spans.push(span);
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}
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}
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}
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}
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} else {
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for line in text.lines() {
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let mut span = Span::styled(line.to_string(), code_style);
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lines.push(Spans::from(span));
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}
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}
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} else {
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for line in text.lines() {
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let mut span = Span::styled(line.to_string(), code_style);
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lines.push(Spans::from(span));
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}
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}
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} else if let Some(Tag::Heading(_)) = tags.last() {
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let mut span = to_span(text);
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span.style = heading_style;
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spans.push(span);
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} else {
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let mut span = to_span(text);
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span.style = text_style;
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spans.push(span);
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}
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}
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Event::Code(text) | Event::Html(text) => {
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let mut span = to_span(text);
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span.style = code_style;
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spans.push(span);
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}
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Event::SoftBreak | Event::HardBreak => {
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// let spans = std::mem::replace(&mut spans, Vec::new());
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// lines.push(Spans::from(spans));
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spans.push(Span::raw(" "));
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}
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Event::Rule => {
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lines.push(Spans::from("---"));
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lines.push(Spans::default());
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}
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// TaskListMarker(bool) true if checked
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_ => {
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log::warn!("unhandled markdown event {:?}", event);
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}
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}
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// build up a vec of Paragraph tui widgets
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}
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if !spans.is_empty() {
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lines.push(Spans::from(spans));
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}
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// if last line is empty, remove it
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if let Some(line) = lines.last() {
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if line.0.is_empty() {
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lines.pop();
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}
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}
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Text::from(lines)
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}
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impl Component for Markdown {
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fn render(&self, area: Rect, surface: &mut Surface, cx: &mut Context) {
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use tui::widgets::{Paragraph, Widget, Wrap};
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let text = parse(&self.contents, Some(&cx.editor.theme), &self.config_loader);
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let par = Paragraph::new(text)
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.wrap(Wrap { trim: false })
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.scroll((cx.scroll.unwrap_or_default() as u16, 0));
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let area = Rect::new(area.x + 1, area.y + 1, area.width - 2, area.height - 2);
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par.render(area, surface);
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}
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fn required_size(&mut self, viewport: (u16, u16)) -> Option<(u16, u16)> {
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let contents = parse(&self.contents, None, &self.config_loader);
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let padding = 2;
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let width = std::cmp::min(contents.width() as u16 + padding, viewport.0);
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let height = std::cmp::min(contents.height() as u16 + padding, viewport.1);
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Some((width, height))
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}
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}
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