文件搜索
小于 1 分钟
文件搜索
use std::fs;
use std::error::Error;
use std::env;
pub fn search_case_insensitive<'a>(query: &str,contents: &'a str,) -> Vec<&'a str> {
let query = query.to_lowercase();
let mut results = Vec::new();
for line in contents.lines() {
if line.to_lowercase().contains(&query) {
results.push(line);
}
}
results
}
pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
let contents = fs::read_to_string(config.file_path)?;
let results = if config.ignore_case {
search_case_insensitive(&config.query, &contents)
}else{
vec!["NULL"]
};
for line in results {
println!("{line}");
}
Ok(())
}
pub struct Config {
pub query: String,
pub file_path: String,
pub ignore_case: bool
}
impl Config {
pub fn build(args: &[String]) -> Result<Config, &'static str> {
if args.len() < 3 {
return Err("not enough arguments");
}
let query = args[1].clone();
let file_path = args[2].clone();
let ignore_case = env::var("IGNORE_CASE").is_ok();
Ok(Config {
query,
file_path,
ignore_case,
})
}
}
use std::env;
use std::process;
use minigrep::Config;
fn main() {
let args: Vec<String> = env::args().collect();
let config = Config::build(&args).unwrap();
println!("Searching for {}", config.query);
println!("In file {}", config.file_path);
if let Err(e) = minigrep::run(config) {
println!("Application error: {e}");
process::exit(1);
}
}