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type GitExec = (args: string[]) => Promise<unknown>

const FULL_GIT_OBJECT_ID_PATTERN = /^[0-9a-f]{40}$/i

export function isFullGitObjectId(value: string): boolean {

return FULL_GIT_OBJECT_ID_PATTERN.test(value.trim())

}

export async function hasCommitObjectViaGitExec(gitExec: GitExec, ref: string): Promise<boolean> {

const candidate = ref.trim()

if (!isFullGitObjectId(candidate)) {

return false

}

try {

await gitExec(['rev-parse', '--verify', '--quiet', `${candidate}^{commit}`])

return true

} catch {

return false

}