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use std::fs; use std::error::Error; use std::env; use std::process; pub struct Config { pub query: String, pub fname: String, pub insensitive: bool, } pub fn run(config: Config) -> Result<(), Box<dyn Error>> { let contents = fs::read_to_string(&config.fname)?; let results = if config.insensitive { search_insensitive(&config.query, &contents) } else { search(&config.query, &contents) }; for line in results { println!("{}", line); } Ok(()) } impl Config { pub fn new(mut args: std::env::Args) -> Result<Config, &'static str> { args.next(); let query = match args.next() { Some(s) => s, None => return Err("ERROR: No query argument"), }; let fname = match args.next() { Some(s) => s, None => return Err("ERROR: No filename argument"), }; let mut insensitive = false; while let Some(arg) = args.next() { if arg == "-h" { printHelp(); process::exit(0); } if arg == "-i" { insensitive = true; } } let c = Config { query, fname, insensitive }; Ok(c) } } fn printHelp(){ println!(" USAGE: minigrep pattern file [options] pattern string to search for file path to a file to search through [options] -h displays this help message -i makes search case-insensitive. Default off. "); } fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> { let found = contents.lines().filter(|x| x.contains(&query)).collect(); found } fn search_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> { let found = contents.lines().filter(|x| x.to_lowercase().contains(&query)).collect(); found } #[cfg(test)] mod tests{ use super::*; #[test] fn getone() { let q = "duct"; let c = "\ Rust: safe, fast, productive. Pick three. "; assert_eq!( vec!["safe, fast, productive."], search(q, c) ); } #[test] fn getNone() { let q = "ayyy"; let c = "\ Rust: safe, fast, productive. Pick three. "; let base: Vec<&str> = Vec::new(); assert_eq!( base, search(q,c) ); } #[test] fn getMultiple() { let q = "ayy"; let c = "\ ayy lmao: safe, fast, productive. waayy lmao lol. "; let base: Vec<&str> = vec!["ayy lmao:", "waayy lmao lol."]; assert_eq!( base, search(q,c) ); } #[test] fn case_sensitive() { let q = "duct"; let c = "\ Rust: safe, fast, productive. Pick three. Duct tape."; assert_eq!(vec!["safe, fast, productive."], search(q, c)); } #[test] fn case_insensitive() { let q = "duct"; let c = "\ Rust: safe, fast, productive. Pick three. Duct tape."; assert_eq!(vec!["safe, fast, productive.", "Duct tape."], search_insensitive(q, c)); } }