Struct Seen 

pub struct Seen(/* private fields */);

The hash (content_hash) of each file’s text as Read last showed it or Edit or Write last left it, by resolved path; shared by its clones. With it, an edit whose old_text is not found says whether the file changed since, and so needs reading again.

It also keeps the whole text of the files last seen whole, up to 8 MB of them, so an edit starts from it and only writes, if the file still holds that text (Workspace::write_if).

Implementations

impl Seen

pub fn saw(&self, path: &Path, hash: ContentHash)

Notes that the file path held the text with hash.

pub fn saw_whole(&self, path: &Path, text: &str)

Notes that the file path held text, all of it: its hash, and the text itself, which a text seen longer ago may make room for.

pub fn forget(&self, path: &Path)

Forgets what path held, as after a write of it that may or may not have happened, so the next edit starts from the file itself.

pub fn hash(&self, path: &Path) -> Option<ContentHash>

The hash of the text path last held when it was seen, if it was.

pub fn text(&self, path: &Path) -> Option<(ContentHash, Arc<str>)>

The whole text path held when it was last seen, and its hash, if it was seen whole then and the text is still kept.

Trait Implementations

impl Clone for Seen

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Seen

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

Formats the value using the given formatter.

impl Default for Seen

fn default() -> Self

Returns the “default value” for a type.