initial touch function with two tests for file creation and timestamp…

… update

Cargo.toml

@@ -18,3 +18,4 @@ sysinfo = "0.17"
 dirs = "3.0"
 chrono = "0.4"
 termion = "*"
+fs-set-times = "0.6"

README.md

@@ -8,5 +8,6 @@ TODO:
 - [x] Allow chain of commands when `&&` is supplied
 - [ ] Handle `&` symbol to send command as a background process
 - [ ] Handle arrow, home, end keyboard inputs and cursor movement
-- [ ] Implement `history` functionality
-- [ ] Implement dot/source function
+- [ ] Implement `source` function
+- [ ] Implement `history` function
+- [ ] Implement `dot/source` function

src/main.rs

@@ -1,5 +1,6 @@
 pub mod shellname;
 pub mod tokenizer;
+pub mod touch;
 
 use crate::shellname::*;
 use crate::tokenizer::*;

src/shellname.rs

@@ -81,4 +81,11 @@ mod test {
         let sh = ShellName::new("home");
         assert_eq!("home".to_string(), sh.current_dir);
     }
+
+    #[test]
+    fn test_dir_change() {
+        let mut sh = ShellName::new("home");
+        sh.set_current_dir("~");
+        assert_eq!("~".to_string(), sh.current_dir);
+    }
 }

src/touch.rs

@@ -0,0 +1,52 @@
+use fs_set_times::{set_mtime, SystemTimeSpec};
+use std::fs;
+use std::io::Result;
+use std::path::Path;
+use std::thread;
+use std::time::SystemTime;
+
+fn touch(option: char, file: &str) -> Result<()> {
+    if Path::new(file).exists() {
+        let now = SystemTime::now();
+        set_mtime(file, SystemTimeSpec::from(now))?;
+    } else {
+        fs::File::create(file)?;
+    }
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use core::time;
+
+    use super::*;
+
+    #[test]
+    fn create_file() {
+        let _ = touch('a', "test001.txt");
+        assert!(Path::new("test.txt").exists());
+        if let Err(_) = fs::remove_file("test.txt") {
+            eprintln!("Can't remove test.txt");
+        }
+    }
+
+    #[test]
+    fn test_updated_timestamp() {
+        let _ = touch('a', "test002.txt");
+        let mut metadata = fs::metadata("test002.txt").unwrap();
+        let init_time = metadata.modified().unwrap();
+
+        thread::sleep(time::Duration::from_secs(3));
+
+        let _ = touch('a', "test002.txt");
+        metadata = fs::metadata("test002.txt").unwrap();
+        let modified_time = metadata.modified().unwrap();
+
+        let diff = modified_time.duration_since(init_time).unwrap().as_secs();
+        assert_eq!(diff, time::Duration::from_secs(3).as_secs());
+
+        if let Err(_) = fs::remove_file("test002.txt") {
+            eprintln!("Can't remove test.txt");
+        }
+    }
+}