删除Index析构自动保存，时机不可控，改为手动+main结束自动save

src/commands/add.rs

@@ -31,12 +31,14 @@ pub fn add(raw_paths: Vec<String>, all: bool, mut update: bool) {
         println!("{}", "--update 只对已跟踪文件进行操作 不包含new".bright_green());
     }
 
+    let index = Index::get_instance();
     for file in &files {
-        add_a_file(file);
+        add_a_file(file, index);
     }
+    index.save();
 }
 
-fn add_a_file(file: &Path) {
+fn add_a_file(file: &Path, index: &mut Index) {
     let workdir = util::get_working_dir().unwrap();
     if !util::is_sub_path(file, &workdir) {
         //文件不在工作区内
@@ -49,7 +51,6 @@ fn add_a_file(file: &Path) {
         return;
     }
 
-    let index = Index::get_instance();
     let rel_path = util::to_cur_relative_path(file);
     if !file.exists() {
         //文件被删除

src/commands/commit.rs

@@ -31,6 +31,7 @@ pub fn commit(message: String, allow_empty: bool) {
     }
 
     println!("commit hash: {:?}", commit_hash);
+    index.save();
 }
 
 #[cfg(test)]

src/commands/remove.rs

@@ -38,5 +38,6 @@ pub fn remove(files: Vec<String>, cached: bool, recursive: bool) -> io::Result<(
         }
         println!("removed [{}]", file.bright_green());
     }
+    index.save();
     Ok(())
 }

src/commands/restore.rs

@@ -136,6 +136,7 @@ pub fn restore_index(filter: Option<&Vec<PathBuf>>, target_blobs: &Vec<(PathBuf,
             }
         }
     }
+    index.save();
 }
 /**
 对于工作区中的新文件，若已跟踪，则删除；若未跟踪，则保留<br>
@@ -224,8 +225,7 @@ mod test {
         util::ensure_no_file(&path);
         cmd::add(vec![], true, false); //add -A
         cmd::restore(vec![".".to_string()], Some("HEAD".to_string()), false, true);
-        let index = Index::get_instance();
-        assert!(index.get_tracked_files().is_empty());
+        assert!(Index::get_instance().is_empty());
     }
 
     #[test]