Add syntax highlighting for code snippets

This patch uses syntect to add syntax highlighting for code snippets in the rich text output. Currently, this only applies to the examples printed with the -e/--examples option.
4 years ago · dc7b5b1eca
parent d16f45e023
commit dc7b5b1eca
4 changed files with 284 additions and 4 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -5,6 +5,12 @@ SPDX-License-Identifier: MIT

 # Changelog for rusty-man

+## Unreleased
+
+- Add syntax highlighting:
+  - Add syntax highlighting using `syntect` for code snippets displayed with
+    the rich text viewer.
+
 ## v0.1.3 (2020-07-28)

 This patch release adds support for documentation generated with Rust 1.45.0
--- a/Cargo.lock
+++ b/Cargo.lock
@ -25,6 +25,11 @@ name = "arc-swap"
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@ -38,6 +43,20 @@ dependencies = [
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@ -48,11 +67,25 @@ name = "byteorder"
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@ -71,6 +104,14 @@ dependencies = [
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@ -169,6 +210,22 @@ dependencies = [
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@ -206,6 +263,14 @@ name = "gimli"
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@ -238,6 +303,15 @@ dependencies = [
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@ -259,11 +333,24 @@ name = "lazy_static"
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@ -365,11 +452,48 @@ dependencies = [
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+"checksum onig_sys 69.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3814583fad89f3c60ae0701d80e87e1fd3028741723deda72d0d4a0ecf0cb0db"
 "checksum pager 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b69ced2bfa977c4541743a7427b89c94120684791a9629941fe6028dccab6528"
 "checksum parking_lot 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d3a704eb390aafdc107b0e392f56a82b668e3a71366993b5340f5833fd62505e"
 "checksum parking_lot_core 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d58c7c768d4ba344e3e8d72518ac13e259d7c7ade24167003b8488e10b6740a3"
@ -931,6 +1151,8 @@ dependencies = [
 "checksum phf_generator 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "17367f0cc86f2d25802b2c26ee58a7b23faeccf78a396094c13dced0d0182526"
 "checksum phf_macros 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7f6fde18ff429ffc8fe78e2bf7f8b7a5a5a6e2a8b58bc5a9ac69198bbda9189c"
 "checksum phf_shared 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c00cf8b9eafe68dde5e9eaa2cef8ee84a9336a47d566ec55ca16589633b65af7"
+"checksum pkg-config 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)" = "d36492546b6af1463394d46f0c834346f31548646f6ba10849802c9c9a27ac33"
+"checksum plist 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7b336d94e8e4ce29bf15bba393164629764744c567e8ad306cc1fdd0119967fd"
 "checksum ppv-lite86 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "237a5ed80e274dbc66f86bd59c1e25edc039660be53194b5fe0a482e0f2612ea"
 "checksum precomputed-hash 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
 "checksum proc-macro-error 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "fc175e9777c3116627248584e8f8b3e2987405cabe1c0adf7d1dd28f09dc7880"
@ -944,8 +1166,11 @@ dependencies = [
 "checksum rand_hc 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
 "checksum rand_pcg 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "16abd0c1b639e9eb4d7c50c0b8100b0d0f849be2349829c740fe8e6eb4816429"
 "checksum redox_syscall 0.1.57 (registry+https://github.com/rust-lang/crates.io-index)" = "41cc0f7e4d5d4544e8861606a285bb08d3e70712ccc7d2b84d7c0ccfaf4b05ce"
+"checksum regex-syntax 0.6.18 (registry+https://github.com/rust-lang/crates.io-index)" = "26412eb97c6b088a6997e05f69403a802a92d520de2f8e63c2b65f9e0f47c4e8"
 "checksum rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "4c691c0e608126e00913e33f0ccf3727d5fc84573623b8d65b2df340b5201783"
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+"checksum safemem 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ef703b7cb59335eae2eb93ceb664c0eb7ea6bf567079d843e09420219668e072"
+"checksum same-file 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
 "checksum scopeguard 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
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@ -967,6 +1192,7 @@ dependencies = [
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+"checksum syntect 4.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b57a45fdcf4891bc79f635be5c559210a4cfa464891f969724944c713282eedb"
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@ -976,8 +1202,11 @@ dependencies = [
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--- a/Cargo.toml
+++ b/Cargo.toml
@ -38,3 +38,8 @@ features = ["derive"]
 [dependencies.structopt]
 version = "0.3.15"
 default-features = false
+
+[dependencies.syntect]
+version = "4.3.0"
+default-features = false
+features = ["parsing", "regex-onig", "assets", "dump-load"]
--- a/src/viewer/text/rich.rs
+++ b/src/viewer/text/rich.rs
@ -10,15 +10,19 @@ use crate::viewer;

 type RichString = text_renderer::TaggedString<Vec<text_renderer::RichAnnotation>>;

-#[derive(Clone, Debug)]
+#[derive(Debug)]
 pub struct RichTextRenderer {
    line_length: usize,
+    syntax_set: syntect::parsing::SyntaxSet,
+    theme_set: syntect::highlighting::ThemeSet,
 }

 impl RichTextRenderer {
    pub fn new() -> Self {
        Self {
            line_length: viewer::get_line_length(),
+            syntax_set: syntect::parsing::SyntaxSet::load_defaults_newlines(),
+            theme_set: syntect::highlighting::ThemeSet::load_defaults(),
        }
    }

@ -26,6 +30,34 @@ impl RichTextRenderer {
        let content = get_styled_content(ts);
        write!(io::stdout(), "{}", content)
    }
+
+    fn render_syntax(&self, line: &[(syntect::highlighting::Style, &str)]) -> io::Result<()> {
+        use crossterm::style::{Attribute, Color};
+        use syntect::highlighting::FontStyle;
+
+        for (style, text) in line {
+            let mut content = crossterm::style::style(text).with(Color::Rgb {
+                r: style.foreground.r,
+                g: style.foreground.g,
+                b: style.foreground.b,
+            });
+            if style.font_style.contains(FontStyle::BOLD) {
+                // TODO: investigate why NoBold does not work
+                content = content
+                    .attribute(Attribute::Bold)
+                    .attribute(Attribute::Reset);
+            }
+            if style.font_style.contains(FontStyle::UNDERLINE) {
+                content = content.attribute(Attribute::Underlined);
+            }
+            if style.font_style.contains(FontStyle::ITALIC) {
+                content = content.attribute(Attribute::Italic);
+            }
+            write!(io::stdout(), "{}", content)?;
+        }
+
+        Ok(())
+    }
 }

 impl super::Printer for RichTextRenderer {
@ -55,9 +87,17 @@ impl super::Printer for RichTextRenderer {
    }

    fn print_code(&self, indent: usize, code: &doc::Text) -> io::Result<()> {
-        for line in code.plain.split('\n') {
-            writeln!(io::stdout(), "{}{}", " ".repeat(indent), line)?;
+        let syntax = self.syntax_set.find_syntax_by_extension("rs").unwrap();
+        let theme = &self.theme_set.themes["base16-eighties.dark"];
+        let mut h = syntect::easy::HighlightLines::new(syntax, theme);
+
+        for line in syntect::util::LinesWithEndings::from(&code.plain) {
+            let ranges = h.highlight(line, &self.syntax_set);
+            write!(io::stdout(), "{}", " ".repeat(indent))?;
+            self.render_syntax(&ranges)?;
        }
+        writeln!(io::stdout())?;
+
        Ok(())
    }

@ -87,7 +127,7 @@ fn get_styled_content(ts: &RichString) -> crossterm::style::StyledContent<&str>
            RichAnnotation::Link(_) => content.attribute(Attribute::Underlined),
            RichAnnotation::Image => content,
            RichAnnotation::Emphasis => content.attribute(Attribute::Italic),
-            // TODO: investigeate why NoBold does not work
+            // TODO: investigate why NoBold does not work
            RichAnnotation::Strong => content
                .attribute(Attribute::Bold)
                .attribute(Attribute::Reset),