Pick any line to see why it is the way it is: the commit, the pull request and issue it came from, and what the agent was thinking.
| Invite-only launch: sign in with GitHub, repository access and lifecycle, many emails, a new look | 1 | /** |
| 2 | * How far a branch has moved from the default branch, worked out from the | |
| 3 | * two histories alone: commits it has that the default branch does not | |
| 4 | * (ahead), and commits the default branch gained since they last agreed | |
| 5 | * (behind). Each history is read only so far back, so a count that ran | |
| 6 | * past it is a lower bound, said with `aheadMore` and `behindMore`. | |
| 7 | */ | |
| 8 | export type Drift = { ahead: number; behind: number; aheadMore: boolean; behindMore: boolean }; | |
| 9 | ||
| 10 | /** `branch` and `main` are commit hashes, newest first; `limit` is how many each was asked for. */ | |
| 11 | export function drift(branch: string[], main: string[], limit: number): Drift { | |
| 12 | const onMain = new Set(main); | |
| 13 | let ahead = branch.findIndex((hash) => onMain.has(hash)); | |
| 14 | if (ahead === -1) { | |
| 15 | // No shared commit within reach: everything read is ahead, and how far | |
| 16 | // behind it is cannot be told. | |
| 17 | return { ahead: branch.length, behind: 0, aheadMore: branch.length >= limit, behindMore: true }; | |
| 18 | } | |
| 19 | const base = branch[ahead]; | |
| 20 | const behind = main.indexOf(base); | |
| 21 | return { ahead, behind, aheadMore: false, behindMore: false }; | |
| 22 | } | |
| 23 | ||
| 24 | /** `12`, or `50+` when the count ran past what was read. */ | |
| 25 | export function count(value: number, more: boolean): string { | |
| 26 | return more ? `${value}+` : String(value); | |
| 27 | } |