Updated 'src/io_project/env_variables.md'.

projects/minigrep/src/lib.rs

@@ -10,18 +10,52 @@ pub fn search<'a> (query: &str, contents: &'a str) -> Vec<&'a str> {
     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
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
 
     #[test]
-    fn one_result() {
+    fn case_sensitive() {
         let query = "duct";
         let contents = "\
 Rust:
 safe, fast, productive.
-Pick three.";
+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)
+        );
+    }
 }
+
+

projects/minigrep/src/main.rs

@@ -22,7 +22,13 @@ fn main() {
 fn run(config: Config) -> Result<(), Box<dyn Error>>{
     let contents = fs::read_to_string(config.file_path)?;
 
-    for line in search(&config.query, &contents) {
+    let results: Vec<&str> = if config.ignore_case {
+        search_insensitive(&config.query, &contents)
+    } else {
+        search(&config.query, &contents)
+    }
+
+    for line in results {
         println! ("{line}");
     }
 
@@ -30,8 +36,9 @@ fn run(config: Config) -> Result<(), Box<dyn Error>>{
 }
 
 struct Config {
-    query: String,
-    file_path: String,
+    pub query: String,
+    pub file_path: String,
+    pub ignore_case: bool,
 }
 
 impl Config {
@@ -43,6 +50,12 @@ impl Config {
         let query = args[1].clone();
         let file_path = args[2].clone();
 
-        Ok(Config { query, file_path })
+        let ignore_case = env::var("IGNORE_CASE").is_ok();
+
+        Ok(Config {
+            query,
+            file_path,
+            ignore_case,
+        })
     }
 }