Add a search function

Cargo.lock

@@ -2,6 +2,33 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "colored"
+version = "3.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "faf9468729b8cbcea668e36183cb69d317348c2e08e994829fb56ebfdfbaac34"
+dependencies = [
+ "windows-sys",
+]
+
 [[package]]
 name = "m-grep"
 version = "0.1.0"
+dependencies = [
+ "colored",
+]
+
+[[package]]
+name = "windows-link"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
+
+[[package]]
+name = "windows-sys"
+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]

Cargo.toml

@@ -4,3 +4,4 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+colored = "3"

poem.txt

@@ -0,0 +1,9 @@
+I'm nobody! Who are you?
+Are you nobody, too?
+Then there's a pair of us - don't tell!
+They'd banish us, you know.
+
+How dreary to be somebody!
+How public, like a frog
+To tell your name the livelong day
+To an admiring bog!

src/lib.rs

@@ -1,23 +1,75 @@
+use std::fs::File;
+use std::io::Read;
+use std::path::Path;
 
+use colored::Colorize;
 
+#[derive(Debug)]
 pub struct Config {
-    search_text: String,
+    query: String,
     file_path: String,
     ignor_case: bool,
 }
 
 impl Config {
-    pub fn build(mut args: Vec<String>) -> () {
+    pub fn build(mut args: Vec<String>) -> Result<Self, &'static str> {
         args.remove(0); // Remove program path
+        let ignor_case = Self::ignore_case(&mut args);
 
-        println!("{:?}", args);
-        // Self {
-            
-        // }
-        ()
+        if args.len() < 2 {
+            return Err("Argument not enough!");
         }
 
-    fn is_ignore_case(args: Vec<String>) {
+        let (query, file_path) = (args.remove(0), args.remove(0));
+        Ok(Self {
+            query,
+            file_path,
+            ignor_case,
+        })
+    }
 
+    fn ignore_case(args: &mut Vec<String>) -> bool {
+        for (i, arg) in args.iter().enumerate() {
+            if arg.contains("-i") {
+                args.remove(i);
+                return true;
             }
         }
+        false
+    }
+}
+
+pub fn search(config: Config) -> Result<Vec<String>, &'static str> {
+    let file_path = config.file_path;
+    if !Path::new(&file_path).exists() {
+        return Err("File not exists!");
+    }
+
+    let query = config.query;
+
+    let mut file = File::open(file_path).unwrap();
+    let mut file_content = String::new();
+    file.read_to_string(&mut file_content).unwrap();
+
+    let mut str_result: Vec<String> = Vec::new();
+
+    if config.ignor_case {
+        for line in file_content.lines() {
+            let search_lower = query.to_lowercase();
+            let line_lower = line.to_lowercase();
+
+            if line_lower.contains(&search_lower) {
+                let custom_line = line.replace(&query, &query.red());
+                str_result.push(custom_line);
+            }
+        }
+    } else {
+        for line in file_content.lines() {
+            if line.contains(&query) {
+                let highlighted = line.replace(&query, &query.green().to_string());
+                str_result.push(highlighted);
+            }
+        }
+    }
+    Ok(str_result)
+}

src/main.rs

@@ -1,5 +1,24 @@
+use std::process;
+
+use colored::Colorize;
+
+use m_grep::{Config, search};
 
 fn main() {
     let args: Vec<String> = std::env::args().collect();
-    m_grep::Config::build(args);
+
+    if let Err(err) = run(args) {
+        eprintln!("{}: {}", "Error".red().bold(), err.to_string().red());
+        process::exit(1);
+    }
+}
+
+fn run(args: Vec<String>) -> Result<(), Box<dyn std::error::Error>> {
+    let config = Config::build(args)?;
+    let result = search(config)?;
+
+    for line in result {
+        println!("{line}");
+    }
+    Ok(())
 }