add staged in status

src/utils/index.rs

@@ -0,0 +1,27 @@
+use std::fs::OpenOptions;
+use std::fs::File;
+use std::path::PathBuf;
+use crate::utils::read;
+use std::io;
+
+pub fn read_only(mut path: PathBuf) -> File {
+    path.push("index");
+    OpenOptions::new()
+        .read(true)
+        .open(path).expect("Cannot open index file")
+}
+
+pub fn open(mut path: PathBuf) -> File {
+    path.push("index");
+    OpenOptions::new()
+        .read(true)
+        .write(true)
+        .append(true)
+        .create(true)
+        .open(path).expect("Cannot open index file")
+}
+
+pub fn read_line(mut path: PathBuf) -> io::Result<io::Lines<io::BufReader<File>>> {
+    path.push("index");
+    read::read_lines(path)
+}

src/utils/read.rs

@@ -0,0 +1,20 @@
+use std::path::{Path, PathBuf};
+use std::io::{self, BufRead};
+use std::fs::{self, File};
+
+// The output is wrapped in a Result to allow matching on errors
+// Returns an Iterator to the Reader of the lines of the file.
+pub 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())
+}
+
+pub fn read_folder(path: PathBuf) -> io::Result<Vec<PathBuf>> {
+    let mut entries = fs::read_dir(path)?
+        .map(|res| res.map(|e| e.path()))
+        .collect::<Result<Vec<_>, io::Error>>()?;
+ 
+    entries.sort();
+    Ok(entries)
+}