add line in index

src/commands/add.rs

@@ -1,5 +1,8 @@
 use clap::Values;
+use std::fs::OpenOptions;
 use crate::utils;
+use std::path::Path;
+use std::io::Write
 
 pub fn add(files: Values<'_>) {
     let root = match utils::path::nextsync_root() {
@@ -10,9 +13,33 @@ pub fn add(files: Values<'_>) {
         } 
     };
 
-    dbg!(root.clone());
+    let mut index_path = root.clone();
+    index_path.push(".nextsync");
+    index_path.push("index");
+    let mut index_file = OpenOptions::new()
+            .read(true)
+            .write(true)
+            .append(true)
+            .create(true)
+            .open(index_path).expect("Cannot open index file");
+
     let file_vec: Vec<&str> = files.collect();
     for file in file_vec {
+        let path = Path::new(file);
         println!("{}", file);
+        match path.try_exists() {
+            Ok(true) => {
+                match writeln!(index_file, "{}", path.display()) {
+                    Ok(()) => (),
+                    Err(err) => eprintln!("{}", err),
+                }
+            },
+            Ok(false) => {
+                // todo can be regex
+            },
+            Err(err) => { 
+                eprintln!("Error: {}", err);
+            }
+        }
     } 
 }