Allow touch command to create files

Author: morr0ne

src/bin/touch.rs

@@ -1,14 +1,19 @@
-use std::io::stdout;
+use std::{ffi::CStr, io::stdout};
 
 use puppyutils::{Result, cli};
-use xenia::{AtFlags, ClockId, Timestamps, clock_gettime, stdio::cwd, utimensat};
+use xenia::{
+    AtFlags, ClockId, Errno, Mode, OFlags, Timestamps, clock_gettime, open, stdio::cwd, utimensat,
+};
 
 pub fn main() -> Result {
     let mut stdout = stdout();
     let mut files = Vec::new();
 
+    let mut no_create = false;
+
     cli! {
         "touch", stdout, #error
+        Short('c') | Long("no-create") => no_create = true
         Value(value) => {
             files.push(value.into_owned());
         }
@@ -22,7 +27,22 @@ pub fn main() -> Result {
     };
 
     for file in files {
-        utimensat(cwd(), file, &timestamps, AtFlags::empty())?
+        match utimensat(cwd(), &file, &timestamps, AtFlags::empty()) {
+            Ok(_) => {}
+            Err(errno) => {
+                if no_create || errno != Errno::NOENT {
+                    return Err(errno.into());
+                }
+
+                let fd = open(
+                    file,
+                    OFlags::WRONLY | OFlags::CREAT,
+                    Mode::from_bits_retain(0o666),
+                )?;
+
+                utimensat::<_, &CStr>(fd, None, &timestamps, AtFlags::empty())?;
+            }
+        }
     }
 
     Ok(())