Enum ContentBasis 

pub enum ContentBasis {
    Nothing,
    Baseline,
    ParentsOutside(Vec<ObjectId>),
}

What: The commits whose trees count as already holding content for one lifecycle. #[derive(...)] generates cloning, debug printing and ==. Why: Each lifecycle compares with a different history: the commit being made with its base, a landed commit with each of its parents, a push with the parents that were published before it.

In TS you’d write (pseudocode):

type ContentBasis = { kind: 'nothing' } | { kind: 'baseline' } | { kind: 'parents-outside'; commits: ObjectId[] };

Variants

Nothing

No tree counts: a direct check reads the selected files for what they hold now, and a push with a tip whose published history is unknown has no commit to vouch for anything.

Baseline

The commit the candidates are compared with: the recorded base of a commit, else the commit HEAD names; an unborn branch has none.

ParentsOutside(Vec<ObjectId>)

Every parent of these commits that is not one of them: a landed commit’s parents, or a push’s already published parents.

Tuple Fields

0: Vec<ObjectId>

The commits whose parents are listed.

Implementations

impl ContentBasis

What: impl ContentBasis { ... } attaches the choice for a request. Why: The choice follows the request’s kind alone, so no policy decides it separately.

In TS you’d write (pseudocode):

class ContentBasis { static of(request: CandidateRequest): ContentBasis }

pub fn of(request: &CandidateRequest) -> ContentBasis

What: The basis of one request. &CandidateRequest borrows what the lifecycle asked for. Why: A parent commit of a pushed commit that is itself pushed is new to the remote, so a push counts only the parents outside the pushed commits. A pushed tip tree has no published base to compare with, and its candidates share one version with the commits’ candidates, so a push with such a tip skips nothing.

In TS you’d write (pseudocode):

static of(request: CandidateRequest): ContentBasis

Trait Implementations

impl Clone for ContentBasis

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 ContentBasis

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

Formats the value using the given formatter.

impl Eq for ContentBasis

impl PartialEq for ContentBasis

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ContentBasis