85 lines
2.4 KiB
Rust
85 lines
2.4 KiB
Rust
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use std::env;
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use std::ffi::OsStr;
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use std::io::BufRead;
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use std::io;
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use std::path::Path;
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use syntect::easy::HighlightLines;
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use syntect::highlighting::ThemeSet;
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use syntect::parsing::{SyntaxSet, SyntaxReference};
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use syntect::html::{
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append_highlighted_html_for_styled_line,
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start_highlighted_html_snippet,
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IncludeBackground,
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};
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fn syntax_from_args(syntaxes: &SyntaxSet) -> Option<&SyntaxReference> {
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// The name of the file to be formatted is usually passed in as
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// the first argument and can be used to determine a syntax set.
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let args = env::args().collect::<Vec<String>>();
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if args.len() != 2 {
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return None
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}
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Path::new(&args[1])
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.extension()
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.and_then(OsStr::to_str)
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.and_then(|ext| syntaxes.find_syntax_by_extension(ext))
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}
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fn should_continue(res: &io::Result<usize>) -> bool {
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match *res {
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Ok(n) => n > 0,
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Err(_) => false,
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}
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}
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fn main() {
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let syntaxes = SyntaxSet::load_defaults_newlines();
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let stdin = io::stdin();
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let mut stdin = stdin.lock();
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let mut linebuf = String::new();
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// Get the first line, we might need it for syntax identification.
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let mut read_result = stdin.read_line(&mut linebuf);
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// Set up the highlighter
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let ts = ThemeSet::load_defaults();
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let theme = &ts.themes["InspiredGitHub"];
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let syntax = syntax_from_args(&syntaxes)
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.or_else(|| syntaxes.find_syntax_by_first_line(&linebuf))
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.unwrap_or_else(|| syntaxes.find_syntax_plain_text());
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let mut hl = HighlightLines::new(syntax, theme);
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let (mut outbuf, bg) = start_highlighted_html_snippet(theme);
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// Rather than using the `lines` iterator, read each line manually
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// and maintain buffer state.
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//
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// This is done because the syntax highlighter requires trailing
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// newlines to be efficient, and those are stripped in the lines
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// iterator.
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while should_continue(&read_result) {
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let regions = hl.highlight(&linebuf, &syntaxes);
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append_highlighted_html_for_styled_line(
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®ions[..],
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IncludeBackground::IfDifferent(bg),
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&mut outbuf,
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);
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// immediately output the current state to avoid keeping
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// things in memory
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print!("{}", outbuf);
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// merry go round again
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linebuf.clear();
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outbuf.clear();
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read_result = stdin.read_line(&mut linebuf);
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}
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println!("</pre>");
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}
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