charset-normalizer-rs 1.0.5

use charset_normalizer_rs::entity::{CLINormalizerArgs, CLINormalizerResult, NormalizerSettings};
use charset_normalizer_rs::from_path;
use clap::Parser;
use dialoguer::Confirm;
use env_logger::Env;
use ordered_float::OrderedFloat;
use std::fs::File;
use std::io::Write;
use std::path::PathBuf;
use std::{fs, process};

fn write_str_to_file(filename: &PathBuf, content: &str) -> std::io::Result<()> {
    // Open the file for writing, creating it if it doesn't exist.
    let mut file = File::create(filename)?;

    // Write the content to the file.
    file.write_all(content.as_bytes())?;

    Ok(())
}

fn normalizer(args: &CLINormalizerArgs) -> Result<i32, String> {
    if args.replace && !args.normalize {
        return Err(String::from(
            "Use --replace in addition of --normalize only.",
        ));
    }

    if args.force && !args.replace {
        return Err(String::from("Use --force in addition of --replace only."));
    }

    if args.threshold < 0.0 || args.threshold > 1.0 {
        return Err(String::from(
            "--threshold VALUE should be between 0. AND 1.",
        ));
    }

    let mut results: Vec<CLINormalizerResult> = vec![];
    let settings = NormalizerSettings {
        threshold: OrderedFloat(args.threshold),
        ..Default::default()
    };

    // go through the files
    for path in &args.files {
        let full_path = &mut fs::canonicalize(path).map_err(|err| err.to_string())?;
        let matches = from_path(full_path, Some(settings.clone()))?;
        match matches.get_best() {
            None => {
                results.push(CLINormalizerResult {
                    path: full_path.clone(),
                    encoding: None,
                    encoding_aliases: vec![],
                    alternative_encodings: vec![],
                    language: "Unknown".to_string(),
                    alphabets: vec![],
                    has_sig_or_bom: false,
                    chaos: 1.0,
                    coherence: 0.0,
                    unicode_path: None,
                    is_preferred: true,
                });
                eprintln!(
                    "Unable to identify originating encoding for {:?}. {}",
                    full_path,
                    if settings.threshold < OrderedFloat(1.0) {
                        "Maybe try increasing maximum amount of chaos."
                    } else {
                        ""
                    }
                );
            }
            Some(best_guess) => {
                // add main result & alternative results
                for m in matches.iter() {
                    let normalize_result = CLINormalizerResult {
                        path: full_path.clone(),
                        encoding: Some(m.encoding().to_string()),
                        encoding_aliases: m
                            .encoding_aliases()
                            .iter()
                            .map(|s| s.to_string())
                            .collect(),
                        alternative_encodings: m
                            .suitable_encodings()
                            .iter()
                            .filter(|&e| e != m.encoding())
                            .cloned()
                            .collect(),
                        language: format!("{}", m.most_probably_language()),
                        alphabets: m.unicode_ranges(),
                        has_sig_or_bom: m.bom(),
                        chaos: m.chaos_percents(),
                        coherence: m.coherence_percents(),
                        unicode_path: None,
                        is_preferred: true,
                    };
                    if m == best_guess {
                        results.insert(0, normalize_result);
                    } else if args.alternatives {
                        results.push(normalize_result);
                    } else {
                        break;
                    }
                }

                // normalizing if need
                if args.normalize {
                    if best_guess.encoding().starts_with("utf") {
                        eprintln!(
                            "{:?} file does not need to be normalized, as it already came from unicode.",
                            full_path,
                        );
                        continue;
                    }

                    // force or confirm of replacement
                    if !args.replace {
                        let filename = full_path.file_name().unwrap().to_str().unwrap();
                        let filename = match filename.rsplit_once('.') {
                            None => filename.to_string() + &*format!(".{}", best_guess.encoding()),
                            Some(split) => {
                                format!("{}.{}.{}", split.0, best_guess.encoding(), split.1)
                            }
                        };
                        full_path.set_file_name(&filename);
                    } else if !args.force
                        && !Confirm::new()
                            .with_prompt(format!(
                                "Are you sure to normalize {:?} by replacing it?",
                                full_path,
                            ))
                            .interact()
                            .unwrap_or(false)
                    {
                        continue;
                    }

                    // save path to result
                    results[0].unicode_path = Some(full_path.clone());

                    // replace file contents
                    if let Err(err) =
                        write_str_to_file(full_path, best_guess.decoded_payload().unwrap())
                    {
                        return Err(err.to_string());
                    }
                }
            }
        }
    }

    // print out results
    if args.minimal {
        for path in &args.files {
            let full_path = &fs::canonicalize(path).unwrap();
            println!(
                "{}",
                results
                    .iter()
                    .filter(|&r| &r.path == full_path)
                    .map(|r| r.encoding.clone().unwrap_or("undefined".to_string()))
                    .collect::<Vec<_>>()
                    .join(", ")
            );
        }
    } else {
        println!(
            "{}",
            if results.len() > 1 {
                serde_json::to_string_pretty(&results).unwrap()
            } else {
                serde_json::to_string_pretty(&results[0]).unwrap()
            }
        );
    }
    Ok(0)
}

pub fn main() {
    let args = CLINormalizerArgs::parse();

    // verbose mode
    if args.verbose {
        env_logger::Builder::from_env(Env::default().default_filter_or("trace")).init();
    }

    // run normalizer
    match normalizer(&args) {
        Err(e) => {
            eprintln!("{}", e);
            process::exit(1);
        }
        Ok(exit_code) => {
            process::exit(exit_code);
        }
    }
}