mirror of https://github.com/KaiserY/trpl-zh-cn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
109 lines
2.1 KiB
109 lines
2.1 KiB
use std::env;
|
|
use std::error::Error;
|
|
use std::fs;
|
|
|
|
pub struct Config {
|
|
pub query: String,
|
|
pub file_path: String,
|
|
pub ignore_case: bool,
|
|
}
|
|
|
|
impl Config {
|
|
pub fn build(
|
|
mut args: impl Iterator<Item = String>,
|
|
) -> Result<Config, &'static str> {
|
|
args.next();
|
|
|
|
let query = match args.next() {
|
|
Some(arg) => arg,
|
|
None => return Err("Didn't get a query string"),
|
|
};
|
|
|
|
let file_path = match args.next() {
|
|
Some(arg) => arg,
|
|
None => return Err("Didn't get a file path"),
|
|
};
|
|
|
|
let ignore_case = env::var("IGNORE_CASE").is_ok();
|
|
|
|
Ok(Config {
|
|
query,
|
|
file_path,
|
|
ignore_case,
|
|
})
|
|
}
|
|
}
|
|
|
|
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 {
|
|
search(&config.query, &contents)
|
|
};
|
|
|
|
for line in results {
|
|
println!("{line}");
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
// ANCHOR: here
|
|
pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
|
|
contents
|
|
.lines()
|
|
.filter(|line| line.contains(query))
|
|
.collect()
|
|
}
|
|
// ANCHOR_END: here
|
|
|
|
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
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn case_sensitive() {
|
|
let query = "duct";
|
|
let contents = "\
|
|
Rust:
|
|
safe, fast, productive.
|
|
Pick three.
|
|
Duct tape.";
|
|
|
|
assert_eq!(vec!["safe, fast, productive."], search(query, contents));
|
|
}
|
|
|
|
#[test]
|
|
fn case_insensitive() {
|
|
let query = "rUsT";
|
|
let contents = "\
|
|
Rust:
|
|
safe, fast, productive.
|
|
Pick three.
|
|
Trust me.";
|
|
|
|
assert_eq!(
|
|
vec!["Rust:", "Trust me."],
|
|
search_case_insensitive(query, contents)
|
|
);
|
|
}
|
|
}
|