diff --git a/helix-term/src/ui/markdown.rs b/helix-term/src/ui/markdown.rs index c503d2c0..b6fd88bc 100644 --- a/helix-term/src/ui/markdown.rs +++ b/helix-term/src/ui/markdown.rs @@ -21,98 +21,101 @@ impl Markdown { Self { contents } } } +fn parse(contents: &str) -> tui::text::Text { + use pulldown_cmark::{CodeBlockKind, CowStr, Event, Options, Parser, Tag}; + use tui::text::{Span, Spans, Text}; + + // 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}}} + let text = "\n```rust\ncore::iter::traits::iterator::Iterator\n```\n\n```rust\nfn collect>(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`](https://doc.rust-lang.org/nightly/core/result/enum.Result.html) items can be collected\ninto `Result, 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 = 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` on the left-hand side. This is because\nwe could collect into, for example, a [`VecDeque`](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 = 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::>();\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::>();\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`](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, &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, &str> = results.iter().cloned().collect();\n\n// gives us the list of answers\nassert_eq!(Ok(vec![1, 3]), result);\n```"; + + let mut options = Options::empty(); + options.insert(Options::ENABLE_STRIKETHROUGH); + let parser = Parser::new_ext(contents, options); + + // TODO: if possible, render links as terminal hyperlinks: https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda + let mut tags = Vec::new(); + let mut spans = Vec::new(); + let mut lines = Vec::new(); + + fn to_span(text: pulldown_cmark::CowStr) -> Span { + use std::ops::Deref; + Span::raw::>(match text { + CowStr::Borrowed(s) => s.to_string().into(), // could retain borrow + CowStr::Boxed(s) => s.to_string().into(), + CowStr::Inlined(s) => s.deref().to_owned().into(), + }) + } + + let text_style = Style::default().fg(Color::Rgb(164, 160, 232)); // lavender + let code_style = Style::default().fg(Color::Rgb(255, 255, 255)); // white + let heading_style = Style::default().fg(Color::Rgb(219, 191, 239)); // lilac + + for event in parser { + match event { + Event::Start(tag) => tags.push(tag), + Event::End(tag) => { + tags.pop(); + match tag { + Tag::Heading(_) | Tag::Paragraph | Tag::CodeBlock(CodeBlockKind::Fenced(_)) => { + // whenever code block or paragraph closes, new line + let spans = std::mem::replace(&mut spans, Vec::new()); + if !spans.is_empty() { + lines.push(Spans::from(spans)); + } + lines.push(Spans::default()); + } + _ => (), + } + } + Event::Text(text) => { + if let Some(Tag::CodeBlock(CodeBlockKind::Fenced(_))) = tags.last() { + for line in text.lines() { + let mut span = Span::styled(line.to_string(), code_style); + lines.push(Spans::from(span)); + } + } else if let Some(Tag::Heading(_)) = tags.last() { + let mut span = to_span(text); + span.style = heading_style; + spans.push(span); + } else { + let mut span = to_span(text); + span.style = text_style; + spans.push(span); + } + } + Event::Code(text) | Event::Html(text) => { + let mut span = to_span(text); + span.style = code_style; + spans.push(span); + } + Event::SoftBreak | Event::HardBreak => { + // let spans = std::mem::replace(&mut spans, Vec::new()); + // lines.push(Spans::from(spans)); + spans.push(Span::raw(" ")); + } + Event::Rule => { + lines.push(Spans::from("---")); + lines.push(Spans::default()); + } + // TaskListMarker(bool) true if checked + _ => (), + } + // build up a vec of Paragraph tui widgets + } + + if !spans.is_empty() { + lines.push(Spans::from(spans)); + } + + Text::from(lines) +} impl Component for Markdown { fn render(&self, area: Rect, surface: &mut Surface, cx: &mut Context) { use tui::widgets::{Paragraph, Widget, Wrap}; - use pulldown_cmark::{CodeBlockKind, CowStr, Event, Options, Parser, Tag}; - use tui::text::{Span, Spans, Text}; + let text = parse(&self.contents); - // 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}}} - let text = "\n```rust\ncore::iter::traits::iterator::Iterator\n```\n\n```rust\nfn collect>(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`](https://doc.rust-lang.org/nightly/core/result/enum.Result.html) items can be collected\ninto `Result, 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 = 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` on the left-hand side. This is because\nwe could collect into, for example, a [`VecDeque`](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 = 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::>();\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::>();\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`](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, &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, &str> = results.iter().cloned().collect();\n\n// gives us the list of answers\nassert_eq!(Ok(vec![1, 3]), result);\n```"; - - let mut options = Options::empty(); - options.insert(Options::ENABLE_STRIKETHROUGH); - let parser = Parser::new_ext(&self.contents, options); - - // TODO: if possible, render links as terminal hyperlinks: https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda - let mut tags = Vec::new(); - let mut spans = Vec::new(); - let mut lines = Vec::new(); - - fn to_span(text: pulldown_cmark::CowStr) -> Span { - use std::ops::Deref; - Span::raw::>(match text { - CowStr::Borrowed(s) => s.into(), - CowStr::Boxed(s) => s.to_string().into(), - CowStr::Inlined(s) => s.deref().to_owned().into(), - }) - } - - let text_style = Style::default().fg(Color::Rgb(164, 160, 232)); // lavender - let code_style = Style::default().fg(Color::Rgb(255, 255, 255)); // white - let heading_style = Style::default().fg(Color::Rgb(219, 191, 239)); // lilac - - for event in parser { - match event { - Event::Start(tag) => tags.push(tag), - Event::End(tag) => { - tags.pop(); - match tag { - Tag::Heading(_) - | Tag::Paragraph - | Tag::CodeBlock(CodeBlockKind::Fenced(_)) => { - // whenever code block or paragraph closes, new line - let spans = std::mem::replace(&mut spans, Vec::new()); - lines.push(Spans::from(spans)); - lines.push(Spans::default()); - } - _ => (), - } - } - Event::Text(text) => { - if let Some(Tag::CodeBlock(CodeBlockKind::Fenced(_))) = tags.last() { - for line in text.lines() { - let mut span = Span::styled(line.to_string(), code_style); - lines.push(Spans::from(span)); - } - } else if let Some(Tag::Heading(_)) = tags.last() { - let mut span = to_span(text); - span.style = heading_style; - spans.push(span); - } else { - let mut span = to_span(text); - span.style = text_style; - spans.push(span); - } - } - Event::Code(text) | Event::Html(text) => { - let mut span = to_span(text); - span.style = code_style; - spans.push(span); - } - Event::SoftBreak | Event::HardBreak => { - // let spans = std::mem::replace(&mut spans, Vec::new()); - // lines.push(Spans::from(spans)); - spans.push(Span::raw(" ")); - } - Event::Rule => { - lines.push(Spans::from("---")); - lines.push(Spans::default()); - } - // TaskListMarker(bool) true if checked - _ => (), - } - // build up a vec of Paragraph tui widgets - } - - if !spans.is_empty() { - lines.push(Spans::from(spans)); - } - - let contents = Text::from(lines); - - let par = Paragraph::new(contents) + let par = Paragraph::new(text) .wrap(Wrap { trim: false }) .scroll((cx.scroll.unwrap_or_default() as u16, 0)); @@ -121,7 +124,7 @@ impl Component for Markdown { } fn required_size(&mut self, viewport: (u16, u16)) -> Option<(u16, u16)> { - let contents = tui::text::Text::from(self.contents.clone()); + let contents = parse(&self.contents); let padding = 2; let width = std::cmp::min(contents.width() as u16 + padding, viewport.0); let height = std::cmp::min(contents.height() as u16 + padding, viewport.1);