@@ -6,14 +6,14 @@ use tui::{
66
77use std::sync::Arc;
88
9−use pulldown_cmark::{CodeBlockKind, CowStr, Event, Options, Parser, Tag};
9+use pulldown_cmark::{CodeBlockKind, CowStr, Event, HeadingLevel, Options, Parser, Tag};
1010
1111use helix_core::{
1212 syntax::{self, HighlightEvent, Syntax},
1313 Rope,
1414};
1515use helix_view::{
16− graphics::{Margin, Rect},
16+ graphics::{Margin, Rect, Style},
1717 Theme,
1818};
1919
@@ -21,30 +21,31 @@ pub struct Markdown {
2121 contents: String,
2222
2323 config_loader: Arc<syntax::Loader>,
24−
25− block_style: String,
26− heading_style: String,
2724}
2825
2926// TODO: pre-render and self reference via Pin
3027// better yet, just use Tendril + subtendril for references
3128
3229impl Markdown {
30+ // theme keys, including fallbacks
31+ const TEXT_STYLE: [&'static str; 2] = ["ui.text", "ui"];
32+ const BLOCK_STYLE: [&'static str; 3] = ["markup.raw.inline", "markup.raw", "markup"];
33+ const HEADING_STYLES: [[&'static str; 3]; 6] = [
34+ ["markup.heading.1", "markup.heading", "markup"],
35+ ["markup.heading.2", "markup.heading", "markup"],
36+ ["markup.heading.3", "markup.heading", "markup"],
37+ ["markup.heading.4", "markup.heading", "markup"],
38+ ["markup.heading.5", "markup.heading", "markup"],
39+ ["markup.heading.6", "markup.heading", "markup"],
40+ ];
41+
3342 pub fn new(contents: String, config_loader: Arc<syntax::Loader>) -> Self {
3443 Self {
3544 contents,
3645 config_loader,
37− block_style: "markup.raw.inline".into(),
38− heading_style: "markup.heading".into(),
3946 }
4047 }
4148
42− pub fn style_group(mut self, suffix: &str) -> Self {
43− self.block_style = format!("markup.raw.inline.{}", suffix);
44− self.heading_style = format!("markup.heading.{}", suffix);
45− self
46− }
47−
4849 fn parse(&self, theme: Option<&Theme>) -> tui::text::Text<'_> {
4950 // // 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}}}
5051 // 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```";
@@ -67,17 +68,19 @@ impl Markdown {
6768 })
6869 }
6970
70− macro_rules! get_theme {
71− ($s1: expr) => {
72− theme
73− .map(|theme| theme.try_get($s1.as_str()))
74− .flatten()
75− .unwrap_or_default()
76− };
77− }
78− let text_style = theme.map(|theme| theme.get("ui.text")).unwrap_or_default();
79− let code_style = get_theme!(self.block_style);
80− let heading_style = get_theme!(self.heading_style);
71+ let get_theme = |keys: &[&str]| match theme {
72+ Some(theme) => keys
73+ .iter()
74+ .find_map(|key| theme.try_get(key))
75+ .unwrap_or_default(),
76+ None => Default::default(),
77+ };
78+ let text_style = get_theme(&Self::TEXT_STYLE);
79+ let code_style = get_theme(&Self::BLOCK_STYLE);
80+ let heading_styles: Vec<Style> = Self::HEADING_STYLES
81+ .iter()
82+ .map(|key| get_theme(key))
83+ .collect();
8184
8285 for event in parser {
8386 match event {
@@ -172,9 +175,16 @@ impl Markdown {
172175 lines.push(Spans::from(span));
173176 }
174177 }
175− } else if let Some(Tag::Heading(_, _, _)) = tags.last() {
178+ } else if let Some(Tag::Heading(level, _, _)) = tags.last() {
176179 let mut span = to_span(text);
177− span.style = heading_style;
180+ span.style = match level {
181+ HeadingLevel::H1 => heading_styles[0],
182+ HeadingLevel::H2 => heading_styles[1],
183+ HeadingLevel::H3 => heading_styles[2],
184+ HeadingLevel::H4 => heading_styles[3],
185+ HeadingLevel::H5 => heading_styles[4],
186+ HeadingLevel::H6 => heading_styles[5],
187+ };
178188 spans.push(span);
179189 } else {
180190 let mut span = to_span(text);