Finished TP

Session1/TP2/Text/src/main.rs

@@ -1,4 +1,5 @@
-use std::io::{self, Write};
+use std::fs::File;
+use std::io::{self, BufRead, Write};
 use std::path::Path;
 
 fn main() {
@@ -10,7 +11,10 @@ fn main() {
         print!("\x1b[2J\x1b[H");
         println!("========== Justify some text ==========");
         println!("  A) Set file name (Name: {})", file_name);
-        println!("  B) Set column amount between 50 and 120 (Amount: {})", col_amount);
+        println!(
+            "  B) Set column amount between 50 and 120 (Amount: {})",
+            col_amount
+        );
         println!("  C) Justify and print text");
         println!("  D) Justify and save text");
         println!("  Quit (any other key)");
@@ -31,10 +35,10 @@ fn main() {
                 col_amount = set_col_amount();
             }
             "c" => {
-                print_justified_text();
+                print_justified_text(&file_name, col_amount);
             }
             "d" => {
-                save_justified_text();
+                save_justified_text(&file_name, col_amount);
             }
             _ => {
                 run = false;
@@ -56,9 +60,8 @@ fn set_file_name() -> String {
             .expect("Failed to read from stdin");
         path = path.trim().to_string();
 
-        if Path::new(&path).exists() {
-            path_iscorrect = true;
-        } else {
+        path_iscorrect = Path::new(&path).exists();
+        if !path_iscorrect {
             println!("The specified file does not exist. Please try again.");
         }
     }
@@ -67,11 +70,98 @@ fn set_file_name() -> String {
 }
 
 fn set_col_amount() -> i8 {
-    8
+    let mut input_text: String;
+    let mut col_amount: i8 = 0;
+    let mut amount_iscorrect: bool = false;
+
+    while !amount_iscorrect {
+        input_text = String::new();
+        print!("Enter the desired column amount: ");
+        let _ = io::stdout().flush();
+        io::stdin()
+            .read_line(&mut input_text)
+            .expect("failed to read from stdin");
+
+        match input_text.trim().parse::<i8>() {
+            Ok(i) => {
+                col_amount = i;
+                amount_iscorrect = col_amount >= 50 && col_amount <= 120;
+                if !amount_iscorrect {
+                    println!("The specified amount was not between 50 and 120. Please try again.");
+                }
+            }
+            Err(..) => println!(
+                "input is not an integer: {}. Please try again.",
+                input_text.trim()
+            ),
+        };
+    }
+
+    return col_amount;
 }
 
-fn print_justified_text() {}
+fn print_justified_text(filename: &str, col_amount: i8) {
+    if let Ok(lines) = read_lines(filename) {
+        for line in lines.flatten() {
+            let justified_text = justify_text(&line, col_amount);
+            println!("{}", justified_text);
+        }
+    } else {
+        println!("Failed to read the file.");
+    }
+}
 
-fn save_justified_text() {}
+fn save_justified_text(filename: &str, col_amount: i8) {
+    let output_file = "output.txt";
+    let mut file = File::create(output_file).expect("Failed to create output file.");
 
-fn load_justify_text() {}
+    if let Ok(lines) = read_lines(filename) {
+        for line in lines.flatten() {
+            let justified_text = justify_text(&line, col_amount);
+            writeln!(file, "{}", justified_text).expect("Failed to write to output file.");
+        }
+        println!("Written to {}", output_file);
+    }
+}
+
+fn justify_text(text: &str, col_amount: i8) -> String {
+    if text.len() >= col_amount as usize {
+        return text.to_string();
+    }
+    if text == "" {
+        return text.to_string();
+    }
+
+    let words: Vec<&str> = text.split_whitespace().collect();
+
+    if words.len() == 1 {
+        return format!("{:<width$}", words[0], width = col_amount as usize);
+    }
+
+    let mut justified = String::new();
+    let words_len: usize = words.iter().map(|word| word.len()).sum();
+    let total_spaces = (col_amount as usize) - words_len;
+    let gaps = words.len() - 1;
+    let spaces_per_gap = total_spaces / gaps;
+    let extra_spaces = total_spaces % gaps;
+
+    for (i, word) in words.iter().enumerate() {
+        justified.push_str(word);
+        if i < gaps {
+            justified.push_str(&" ".repeat(spaces_per_gap));
+            if i < extra_spaces {
+                justified.push(' ');
+            }
+        }
+    }
+
+    return justified;
+}
+
+fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
+where
+    P: AsRef<Path>,
+{
+    let file = File::open(filename)?;
+    Ok(io::BufReader::new(file).lines())
+}