rsass 0.25.2

Sass implementation in pure rust (not complete yet)
Documentation 
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use clap::Parser;
use rsass::{
    output::{Format, Style},
    Error, FsFileContext, ScopeRef,
};
use std::io::{stdout, Write};
use std::path::PathBuf;
use std::process::exit;

fn main() {
    match Args::parse().run() {
        Ok(()) => (),
        Err(err) => {
            eprintln!("{}", err);
            exit(1);
        }
    }
}

#[derive(Parser)]
#[clap(
    about,
    author,
    version,
    mut_arg("version", |v| v.short('v')),
    after_help = "For information about rsass and its current state of \
                  development, please refer to https://github.com/kaj/rsass/ .\
                  \n\n\
                  The sass / scss languate itself is documented at \
                  https://sass-lang.com/ ."
)]
struct Args {
    /// How many digits of precision to use when outputting decimal numbers.
    #[clap(long, default_value = "5")]
    precision: usize,

    /// How to format output.
    #[clap(long, short = 't', ignore_case = true,
                default_value = "expanded",
                possible_values = Style::variants())]
    style: Style,

    /// Some kind of forced ascii output
    /// (Not implemented, but set by the sass-spec test runner)
    #[cfg(feature = "unimplemented_args")]
    #[clap(long)]
    #[allow(unused)]
    no_unicode: bool,

    /// No color in error messages
    /// (not that there is any support for color in error messages
    /// anyway yet, but the test runner uses this flag)
    #[cfg(feature = "unimplemented_args")]
    #[clap(long)]
    #[allow(unused)]
    no_color: bool,

    /// Verbose diagnostics
    /// (Always on, but set by the sass-spec test runner)
    #[cfg(feature = "unimplemented_args")]
    #[clap(long)]
    #[allow(unused)]
    verbose: bool,

    /// Where to search for included resources.
    #[clap(long, short = 'I')]
    load_path: Option<PathBuf>,

    /// Sass file(s) to translate
    #[clap(required = true)]
    input: Vec<PathBuf>,
}

impl Args {
    fn run(self) -> Result<(), Error> {
        let format = Format {
            style: self.style,
            precision: self.precision,
        };
        for name in &self.input {
            let (mut file_context, source) = FsFileContext::for_path(name)?;
            if let Some(include_path) = &self.load_path {
                file_context.push_path(include_path.as_ref());
            }
            let source = source.parse()?;
            let result = format.write_root(
                source,
                ScopeRef::new_global(format),
                &file_context,
            )?;
            let out = stdout();
            out.lock().write_all(&result)?;
        }
        Ok(())
    }
}