feat: impl From<entry::Mode> for gix_object::tree::EntryMode.

Author: Byron

Diff for: gix-index/src/entry/mod.rs

@@ -18,9 +18,9 @@ mod write;
 
 use bitflags::bitflags;
 
-// TODO: we essentially treat this as an enum withj the only exception being
-// that `FILE_EXECUTABLE.contains(FILE)` works might want to turn this into an
-// enum proper
+// TODO: we essentially treat this as an enum with the only exception being
+//      that `FILE_EXECUTABLE.contains(FILE)` works might want to turn this into an
+//      enum proper
 bitflags! {
     /// The kind of file of an entry.
     #[derive(Copy, Clone, Debug, PartialEq, Eq)]

Diff for: gix-index/src/entry/mode.rs

@@ -11,6 +11,12 @@ impl Mode {
         *self == Self::DIR | Self::SYMLINK
     }
 
+    /// Convert this instance to a tree's entry mode, or return `None` if for some
+    /// and unexpected reason the bitflags don't resemble any known entry-mode.
+    pub fn to_tree_entry_mode(&self) -> Option<gix_object::tree::EntryMode> {
+        gix_object::tree::EntryMode::try_from(self.bits()).ok()
+    }
+
     /// Compares this mode to the file system version ([`std::fs::symlink_metadata`])
     /// and returns the change needed to update this mode to match the file.
     ///