Method ResolveInput

internal/diff/git.go:158–185

ResolveInput freezes this run's commit endpoints by asking git, following the input-mode matrix: - range: base = merge-base(from,to); head = the commit `to` resolves to; exact_range = base..head only when both resolve. - commit: head = the commit resolved from `commit`; base is the first par

(ctx context.Context)

// It runs read-only git queries and never returns an error: an unresolvable
// endpoint is reported as an empty field, never a fabricated SHA.
func (p *Provider) ResolveInput(ctx context.Context) InputResolution {
	switch p.mode {
	case ModeRange:
		base := p.MergeBase(ctx)
		head := p.resolveCommit(ctx, p.to)
		r := InputResolution{ResolvedBase: base, ResolvedHead: head}
		if base != "" && head != "" {
			r.ExactRange = base + ".." + head
		}
		return r
	case ModeCommit:
		head := p.resolveCommit(ctx, p.commit)
		r := InputResolution{ResolvedHead: head}
		if parents := p.commitParents(ctx, p.commit); len(parents) > 0 && head != "" {
			// GetDiff renders merge commits against their first parent, so the
			// manifest must record that same concrete comparison base.
			r.ResolvedBase = parents[0]
			r.ExactRange = parents[0] + ".." + head
		}
		return r
	case ModeWorkspace:
		// base = current HEAD if the repository has one; an unborn repository has
		// no HEAD, so this stays empty rather than fabricating a base.
		return InputResolution{ResolvedBase: p.resolveCommit(ctx, "HEAD")}
	default:
		return InputResolution{}
	}
}

// IsRangeMode returns true when comparing two refs.
func (p *Provider) IsRangeMode() bool {