feat(add): prevent adding a file without changes

src/commands/add.rs

@@ -42,7 +42,10 @@ pub fn add(args: AddArgs) {
         let path = repo_root().join(Path::new(&f));
         match path.exists() {
             true => {
-                add_entry(path, args.force, &mut added_files, rules.clone(), &mut ignored_f);
+                let mut obj = Obj::from_path(f.clone());
+                if obj.has_changes() {
+                    add_entry(path, args.force, &mut added_files, rules.clone(), &mut ignored_f);
+                }
             },
             false => {
                 if Obj::from_path(file.clone()).exists_on_remote() {

src/store/object/object.rs

@@ -32,6 +32,7 @@ pub trait ObjMethods {
     fn rm_node(&mut self) -> io::Result<()>;
     fn rm_node_down(&mut self) -> io::Result<()>;
     fn exists_on_remote(&mut self) -> bool;
+    fn has_changes(&mut self) -> bool;
 }
 
 pub struct Obj {
@@ -133,6 +134,20 @@ impl ObjMethods for Obj {
     fn exists_on_remote(&mut self) -> bool {
         self.obj_path.exists()
     }
+
+    fn has_changes(&mut self) -> bool {
+        if !self.obj_path.exists() {
+            return true;
+        }
+
+        match self.obj_type {
+            ObjType::BLOB => Blob::from_path(self.relative_file_path.clone()).has_changes(),
+            ObjType::TREE => Tree::from_path(self.relative_file_path.clone()).has_changes(),
+            ObjType::DEFAULT => {
+                unreachable!();
+            }
+        }
+    }
 }
 
 impl ObjMethods for Blob {
@@ -200,6 +215,10 @@ impl ObjMethods for Blob {
     fn exists_on_remote(&mut self) -> bool {
         self.obj.exists_on_remote()
     }
+
+    fn has_changes(&mut self) -> bool {
+        self.obj.has_changes()
+    }
 }
 
 impl ObjMethods for Tree {
@@ -277,6 +296,10 @@ impl ObjMethods for Tree {
     fn exists_on_remote(&mut self) -> bool {
         self.obj.exists_on_remote()
     }
+
+    fn has_changes(&mut self) -> bool {
+        self.obj.has_changes()
+    }
 }
 
 impl Obj {

src/store/object/tree.rs

@@ -11,6 +11,7 @@ pub struct Tree {
     is_head: bool,
 }
 
+
 impl Tree {
     pub fn new(obj: Obj) -> Self {
         Tree {
@@ -50,6 +51,11 @@ impl Tree {
         }
     }
 
+    pub fn has_changes(&mut self) -> bool {
+        todo!();
+        return true;
+    }
+
     pub fn next(&mut self) -> Option<Box<dyn ObjMethods>> {
         self.read();
         //if let Some(ref mut file) = self.buf_reader {