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//! Highlights the files given on the command line, in parallel.
//! Prints the highlighted output to stdout.
use syntect::parsing::SyntaxSet;
use syntect::highlighting::{ThemeSet, Style};
use syntect::easy::HighlightFile;
use rayon::prelude::*;
use std::fs::File;
use std::io::{BufReader, BufRead};
fn main() {
let files: Vec<String> = std::env::args().skip(1).collect();
if files.is_empty() {
println!("Please provide some files to highlight.");
return;
}
let syntax_set = SyntaxSet::load_defaults_newlines();
let theme_set = ThemeSet::load_defaults();
// We first collect the contents of the files...
let contents: Vec<Vec<String>> = files.par_iter()
.map(|filename| {
let mut lines = Vec::new();
// We use `String::new()` and `read_line()` instead of `BufRead::lines()`
// in order to preserve the newlines and get better highlighting.
let mut line = String::new();
let mut reader = BufReader::new(File::open(filename).unwrap());
while reader.read_line(&mut line).unwrap() > 0 {
lines.push(line);
line = String::new();
}
lines
})
.collect();
// ...so that the highlighted regions have valid lifetimes...
let regions: Vec<Vec<(Style, &str)>> = files.par_iter()
.zip(&contents)
.map(|(filename, contents)| {
let mut regions = Vec::new();
let theme = &theme_set.themes["base16-ocean.dark"];
let mut highlighter = HighlightFile::new(filename, &syntax_set, theme).unwrap();
for line in contents {
for region in highlighter.highlight_lines.highlight_line(line, &syntax_set).unwrap() {
regions.push(region);
}
}
regions
})
.collect();
// ...and then print them all out.
for file_regions in regions {
print!("{}", syntect::util::as_24_bit_terminal_escaped(&file_regions[..], true));
}
}
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