// read_file is  读取日志
//
extern crate ansi_term;
use std::io::prelude::*;
use std::fs::File;
use std::io::BufReader;
use std::env;
extern crate clap;
use clap::{Arg, App, SubCommand};


fn color_log(s:String,kyw:String)->(){
    let line=s;
   // kyw="color".to_string();
   // use ansi_term::Colour;
    use ansi_term::Style;
    use ansi_term::Colour::{Blue, Cyan, Yellow,Red};
    let  l=kyw.len();
    let start_bytes = line.find(&kyw).unwrap()+l;
    let  result = &line[start_bytes-l..l];
    println!("    {}",
            Style::new().on(Blue).fg(Red).paint(result));
}

// Returns the path to the user's template directory.
fn read_file(filename:String,kyw:String)->std::io::Result<()>{
    let file = File::open(filename).unwrap();
    let fin = BufReader::new(file);
    let mut i=1;
     for line in fin.lines() {
         print!("{number:>0width$}",number=i, width=6);
         if kyw.len()==0{
             println!(" {}",line.unwrap().to_string());
         }else{
             color_log(line.unwrap().to_string(),kyw.to_string());
           // println!("🥇🥇🥇🥇🥇🥇{}",kyw);
         }
         
         i=i+1;
         if i>50{
             break;
         }
     }
    
    Ok(())
}
/// 主程序
fn main() {
    let args: Vec<String> = env::args().collect();
    let filename = &args[1];
    let mut kyw ="";
    if args.len()>2{
        kyw = &args[2];
    }
    
    let  _f = match File::open(filename){
        Ok(_) => {
                let _r= read_file(filename.to_string(),kyw.to_string());
            },
        Err(_why) => { println!("文件({ })打开失败.",filename);},
    };
    let line="This is simplay in color, blue in color and green in color";
    use ansi_term::Colour;
    use ansi_term::Style;
    use ansi_term::Colour::{Blue, Cyan, Yellow,Red};
    match line.find("cor"){
        Some(start_bytes)=>{println!("{}",start_bytes );},
         None => {
                println!("没有搜索到" );
            }
    }
    
    // let mut result = &line[..start_bytes];
    // println!(" {} {}{}",
    //         Style::new().on(Blue).fg(Red).paint(result),
    //          Colour::Cyan.paint("blue"),
    //          Colour::Yellow.paint("green"));
}