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use std::error::Error;
use std::fs;
use std::env;
pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
let contents = fs::read_to_string(config.filename)?;
let results = if config.case_sensitive {
search(&config.query, &contents)
} else {
search_case_insensitive(&config.query, &contents)
};
for line in results {
println!("Has found in line {}: {}", line.1, line.0);
}
Ok(())
}
fn search<'a>(query: &str, contents: &'a str) -> Vec<(&'a str, i32)> {
contents.lines().zip(1..).filter(|(x, _)| {
x.contains(&query)
}).collect()
}
fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<(&'a str, i32)> {
contents.lines().zip(1..).filter(|(x, _)| {
x.to_lowercase().contains(&query.to_lowercase())
}).collect()
}
pub struct Config {
pub query: String,
pub filename: String,
pub case_sensitive: bool,
pub case_skip_space: bool,
}
impl Config {
pub fn new(mut args: env::Args) -> Result<Config, &'static str> {
args.next();
let query = match args.next() {
Some(arg) => arg,
None => return Err("Didn't get a query string!"),
};
let filename = match args.next() {
Some(arg) => arg,
None => return Err("Didn't get a file name!")
};
let case_sensitive = match env::var("CASE_INSENSITIVE") {
Ok(string) => {
if string == "0" {
true
} else {
false
}
}
Err(_) => true,
};
let case_skip_space = match env::var("CASE_SKIP_SPACE") {
Ok(string) => {
if string == "0" {
false
} else {
true
}
}
Err(_) => false,
};
Ok(Config {
query,
filename,
case_sensitive,
case_skip_space,
})
}
}
#[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!("safe, fast, productive.", search(query, contents)[0].0)
}
#[test]
fn case_insensitive() {
let query = "RuSt";
let contents = "\
Rust:
safe, fast, productive
Trust me.";
assert_eq!(
vec![("Rust:", 1), ("Trust me.", 3)],
search_case_insensitive(query, contents),
);
}
}