add remove line

src/utils/read.rs

@@ -1,9 +1,7 @@
 use std::path::{Path, PathBuf};
-use std::io::{self, BufRead};
-use std::fs::{self, File};
+use std::io::{self, BufRead, BufReader, Write};
+use std::fs::{self, File, OpenOptions};
 
-// 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)?;
@@ -18,3 +16,28 @@ pub fn read_folder(path: PathBuf) -> io::Result<Vec<PathBuf>> {
     entries.sort();
     Ok(entries)
 }
+
+
+pub fn rm_line(path: PathBuf, line_to_del: &str) -> io::Result<()> {
+    let file = File::open(path.clone())?;
+    let reader = BufReader::new(&file);
+    let mut temp_file = OpenOptions::new()
+        .write(true)
+        .create(true)
+        .truncate(true)
+        .open(format!("{}_temp", path.display()))?;
+
+    for line in reader.lines() {
+        let l = line?;
+        if l.trim() != line_to_del.trim() {
+            writeln!(temp_file, "{}", l)?;
+        }
+    }
+
+    drop(file);
+    drop(temp_file);
+
+    fs::remove_file(path.clone())?;
+    fs::rename(format!("{}_temp", path.display()), path)?;
+    Ok(())
+}