Struct OnDiskFingerprint 

pub struct OnDiskFingerprint {
    pub mtime: Option<SystemTime>,
    pub size: u64,
    pub content_hash: u64,
}

The on-disk identity of a file-backed buffer at the moment the editor last synced with disk — a load, or its own :w.

Two comparison surfaces, deliberately distinct:

• Self::same_content (content hash) is the authoritative “is this the same file we already have” test. A touch that bumps mtime without changing bytes must compare equal, so mtime/size are not part of it.
• Self::stat_unchanged is the cheap (mtime, size) pre-gate the watcher uses to decide whether it even needs to read + hash the file.

Fields

mtime: Option<SystemTime>

Last-modified time from stat, or None on platforms / filesystems where it’s unavailable (then detection leans on content_hash alone).

size: u64

Byte length from stat (0 when metadata is unavailable).

content_hash: u64

Hash of the text the editor holds for this file — the precise check that survives mtime-only touches and identifies self-writes.

Implementations

impl OnDiskFingerprint

pub fn from_path_and_text(path: &Path, text: &str) -> OnDiskFingerprint

Build a fingerprint from path’s current metadata plus the text the editor holds for it. stat failure degrades to mtime = None / size = 0 rather than erroring — a missing stat must never break a load or a save (paramount: never panic on the hot path; recover + lean on the content hash).

pub fn same_content(&self, other: &OnDiskFingerprint) -> bool

True when self and other denote the same on-disk content. Content hash is authoritative; mtime/size are ignored so a bare touch is correctly treated as “no change”.

pub fn stat_unchanged(&self, path: &Path) -> bool

Cheap pre-gate: true when path’s current (mtime, size) still match this fingerprint, i.e. the file almost certainly hasn’t changed and the watcher can skip the read + hash entirely. A stat failure returns false (fall through to the authoritative read), as does a None stored mtime (we never had a baseline to gate on).

Trait Implementations

impl Clone for OnDiskFingerprint

fn clone(&self) -> OnDiskFingerprint

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for OnDiskFingerprint

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Eq for OnDiskFingerprint

impl PartialEq for OnDiskFingerprint

fn eq(&self, other: &OnDiskFingerprint) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for OnDiskFingerprint