init

.gitignore

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+/target
+Cargo.lock

.gitmodules

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+[submodule "assets/dracula_theme"]
+	path = assets/dracula_theme
+	url = https://github.com/dracula/sublime.git

Cargo.toml

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+[package]
+name = "synmtx"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = { version = "3.0.0-beta.5", features = ["derive"] }
+html-escape = "0.2.9"
+syntect = "4.6.0"

assets/dracula_theme

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+Subproject commit 09faa29057c3c39e9a45f3a51a5e262375e3bf9f

rustfmt.toml

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+unstable_features = true
+binop_separator = "Back"
+format_code_in_doc_comments = true
+format_macro_matchers = true
+format_strings = true
+imports_layout = "HorizontalVertical"
+match_block_trailing_comma = true
+merge_imports = true
+normalize_comments = true
+use_field_init_shorthand = true
+use_try_shorthand = true
+wrap_comments = true

src/main.rs

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+use std::{
+    io::{BufRead, Cursor},
+    path::PathBuf,
+};
+
+use clap::Parser;
+use syntect::{
+    easy::HighlightFile,
+    highlighting::{Color, Style, ThemeSet},
+    parsing::SyntaxSet,
+};
+
+#[derive(Parser)]
+struct Opt {
+    #[clap(about = "The file to highlight")]
+    file: PathBuf,
+
+    #[clap(
+        long,
+        short,
+        default_value = "dracula",
+        about = "The color scheme to use"
+    )]
+    theme: String,
+}
+
+fn main() {
+    let opt = Opt::parse();
+
+    let ss = SyntaxSet::load_defaults_newlines();
+    let mut ts = ThemeSet::load_defaults();
+    ts.themes.insert(
+        "dracula".to_string(),
+        ThemeSet::load_from_reader(&mut Cursor::new(include_bytes!(
+            "../assets/dracula_theme/Dracula.tmTheme"
+        )))
+        .expect("Failed to load static dracula theme"),
+    );
+
+    let theme = if let Some(t) = ts.themes.get(&opt.theme) {
+        t
+    } else {
+        eprintln!("No such theme!");
+        // TODO dont exit successfully
+        return;
+    };
+
+    let mut h = HighlightFile::new(opt.file, &ss, theme).unwrap();
+
+    print!("<pre>");
+    for line in h.reader.lines() {
+        let line = line.unwrap();
+        let regions = h.highlight_lines.highlight(&line, &ss);
+
+        for (
+            Style {
+                foreground: Color { r, g, b, .. },
+                ..
+            },
+            txt,
+        ) in regions
+        {
+            print!(
+                r##"<font color="#{:02x}{:02x}{:02x}">{}</font>"##,
+                r,
+                g,
+                b,
+                html_escape::encode_text(txt)
+            );
+        }
+
+        println!();
+    }
+    println!("</pre>");
+}