[minigrep] - Adding library and automated tests

minigrep/src/lib.rs

@@ -0,0 +1,86 @@
+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(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,
+        })
+    }
+}
+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
+}
+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 {
+        search(&config.query, &contents)
+    };
+
+    for line in results {
+        println!("{line}");
+    }
+
+    Ok(())
+}
+
+#[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)
+        );
+    }
+}

minigrep/src/main.rs

@@ -1,26 +1,5 @@
+use minigrep::Config;
 use std::env;
-use std::error::Error;
-use std::fs;
-struct Config {
-    query: String,
-    file_path: String,
-}
-impl Config {
-    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();
-        Ok(Config { query, file_path })
-    }
-}
-fn run(config: Config) -> Result<(), Box<dyn Error>> {
-    let contents = fs::read_to_string(config.file_path)?;
-    println!("With text:\n {contents}");
-
-    Ok(())
-}
 fn main() {
     let args: Vec<String> = env::args().collect();
     let config = Config::build(&args).unwrap_or_else(|err| {
@@ -31,7 +10,7 @@ fn main() {
     println!("Searching for {}", config.query);
     println!("In file {}", config.file_path);
 
-    if let Err(e) = run(config) {
+    if let Err(e) = minigrep::run(config) {
         println!("Application error: {e}");
         std::process::exit(1);
     }