wty 0.8.2

Yomitan-compatible dictionaries from wikitionary data
Documentation 
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use std::{
    collections::HashMap,
    fs::File,
    io::{BufWriter, Write},
    path::PathBuf,
};

use anyhow::Result;

use crate::{
    cli::Options,
    models::yomitan::{DetailedDefinition, YomitanDict},
    path::PathManager,
};

pub fn write_debug_forms(_: &Options, _: &PathManager, ydict: YomitanDict) -> Result<PathBuf> {
    // This is a debug format, so just write it at the root
    let filepath = PathBuf::from("debug_forms.txt");

    let file = File::create(&filepath)?;
    let mut writer = BufWriter::new(file);

    // NOTE: we are undoing work and going back to irs... but we can't replace
    // the yomitan dict with irs, since then we should assume that the irs can be
    // of ANY dictionary (and we only care about the main one)
    // ... and in theory, there is no guarantee that the irs format of the main
    // dictionary won't change, while this logic remains the same.
    let mut grouped_by: HashMap<&str, Vec<&str>> = HashMap::new();
    let mut from_to_rules: HashMap<&str, Vec<&str>> = HashMap::new(); // it's short pos

    for entry in &ydict.term_bank_form {
        for def in &entry.definitions {
            let DetailedDefinition::Inflection((from, _tags)) = def else {
                panic!("forms must be made from inflections");
            };
            let rules = from_to_rules.entry(from).or_default();
            if !rules.contains(&entry.rules.as_str()) {
                rules.push(entry.rules.as_str());
            }
            let tos = grouped_by.entry(from).or_default();
            if !tos.contains(&entry.term.as_str()) {
                tos.push(entry.term.as_str());
            }
        }
    }

    for (from, tos) in &grouped_by {
        // SAFETY: rules has the from key, by previous logic
        let from_expanded = format!("{from} | {}", from_to_rules.get(from).unwrap().join(", "));
        writer.write_all(from_expanded.as_bytes())?;
        writer.write_all(b"\n")?;
        for to in tos {
            writer.write_all(to.as_bytes())?;
            writer.write_all(b"\n")?;
        }
        writer.write_all(b"\n")?;
    }

    Ok(filepath)
}