minigrep_ddesreum 0.1.0

//! Contain all the code for this projet with the Config enum and its functions
//! the run, the search and the search_case_insensitive functions

use std::fs;
use std::error::Error;
use std::env;

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"),
        };

        Ok(Config { 
            query, 
            file_path,
            ignore_case: env::var("IGNORE_CASE").is_ok()
        })
    }
}

/// Call search or search_case_insensitive depending on the IGNORE_CASE environnement variable
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(())
}

/// Get only lines of contents that contains the query string. Sensitive to caps.
pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    let mut results = Vec::new();

    for line in contents.lines() {
        if line.contains(query) {
            results.push(line);
        }
    }

    results
}

/// Get only lines of contents that contains the query string. Insensitive to caps.
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 unit_tests;