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use std::env;
use std::ffi::OsStr;
use std::io::BufRead;
use std::io;
use std::path::Path;
use syntect::easy::HighlightLines;
use syntect::dumps::from_binary;
use syntect::highlighting::ThemeSet;
use syntect::parsing::SyntaxSet;
use lazy_static::lazy_static;
use syntect::html::{
append_highlighted_html_for_styled_line,
start_highlighted_html_snippet,
IncludeBackground,
};
// Set up syntaxes as a lazy_static. Initialisation might not be
// required in the case of Markdown rendering (if there's no code
// blocks within the document).
lazy_static! {
static ref SYNTAXES: SyntaxSet = from_binary(include_bytes!(env!("BAT_SYNTAXES")));
}
fn args_extension() -> Option<String> {
// The name of the file to be formatted is usually passed in as
// the first argument and can be used to determine a syntax set.
let args = env::args().collect::<Vec<String>>();
if args.len() != 2 {
return None
}
Path::new(&args[1]).extension()
.and_then(OsStr::to_str)
.map(|s| s.to_string())
}
fn should_continue(res: &io::Result<usize>) -> bool {
match *res {
Ok(n) => n > 0,
Err(_) => false,
}
}
fn format_markdown() {
unimplemented!("Not able to format Markdown just yet");
}
fn format_code(extension: String) {
let stdin = io::stdin();
let mut stdin = stdin.lock();
let mut linebuf = String::new();
// Get the first line, we might need it for syntax identification.
let mut read_result = stdin.read_line(&mut linebuf);
// Set up the highlighter
let ts = ThemeSet::load_defaults();
let theme = &ts.themes["InspiredGitHub"];
let syntax = SYNTAXES.find_syntax_by_extension(&extension)
.or_else(|| SYNTAXES.find_syntax_by_first_line(&linebuf))
.unwrap_or_else(|| SYNTAXES.find_syntax_plain_text());
// We're doing a completely different thing if the file is
// Markdown, so lets do that thing.
if syntax.name == "markdown" {
}
let mut hl = HighlightLines::new(syntax, theme);
let (mut outbuf, bg) = start_highlighted_html_snippet(theme);
// Rather than using the `lines` iterator, read each line manually
// and maintain buffer state.
//
// This is done because the syntax highlighter requires trailing
// newlines to be efficient, and those are stripped in the lines
// iterator.
while should_continue(&read_result) {
let regions = hl.highlight(&linebuf, &SYNTAXES);
append_highlighted_html_for_styled_line(
®ions[..],
IncludeBackground::IfDifferent(bg),
&mut outbuf,
);
// immediately output the current state to avoid keeping
// things in memory
print!("{}", outbuf);
// merry go round again
linebuf.clear();
outbuf.clear();
read_result = stdin.read_line(&mut linebuf);
}
println!("</pre>");
}
fn main() {
let extension = args_extension()
.expect("cheddar should be invoked with a filename!");
if extension == "md" {
format_markdown();
} else {
format_code(extension);
}
}
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