cjkfmt 0.0.1

Formatter for CJK text files
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use std::{
    fs,
    io::{Read, stdin},
    path::{Path, PathBuf},
};

use crate::{
    diagnostic::Diagnostic,
    line_break::{BreakPoint, LineBreaker},
};

pub fn check_command<W: std::io::Write>(
    stderr: &mut W,
    filenames: Vec<PathBuf>,
    max_width: usize,
) -> anyhow::Result<()> {
    // Read content of the specified files or standard input
    if filenames.is_empty() {
        let mut buf = String::with_capacity(1024);
        stdin().read_to_string(&mut buf)?;
        check_one_file(stderr, None, max_width, buf)?;
    } else {
        for filename in filenames {
            let content = fs::read_to_string(&filename)?;
            check_one_file(stderr, Some(&filename), max_width, content)?;
        }
    }
    Ok(())
}

fn check_one_file<W: std::io::Write>(
    stderr: &mut W,
    filename: Option<&Path>,
    max_width: usize,
    content: String,
) -> Result<(), anyhow::Error> {
    let breaker = LineBreaker::builder().max_width(max_width).build()?;

    for (line_no, line) in content.split_inclusive('\n').enumerate() {
        // TODO: Support CR only
        let line_break = match breaker.next_line_break(line) {
            BreakPoint::WrapPoint(i) => i,
            BreakPoint::EndOfLine(_) | BreakPoint::EndOfText(_) => continue,
        };

        let filename = filename.map(|p| p.to_string_lossy());
        let filename = filename.as_deref();

        let (precedings, _) = line.split_at(line_break);
        let column_no = precedings.encode_utf16().fold(0, |acc, _| acc + 1);
        let diagnostic = Diagnostic::new(
            filename,
            line_no,
            column_no,
            "W001".to_string(),
            format!("Line length exceeds {max_width} characters"),
        );
        writeln!(stderr, "{}", diagnostic)?;
    }
    Ok(())
}