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/*
* Copyright © 2014-2021 The Android Password Store Authors. All Rights Reserved.
* SPDX-License-Identifier: GPL-3.0-only
*/
package dev.msfjarvis.aps.util.git
import com.github.michaelbull.result.getOrElse
import com.github.michaelbull.result.runCatching
import dev.msfjarvis.aps.data.repo.PasswordRepository
import dev.msfjarvis.aps.util.extensions.asLog
import dev.msfjarvis.aps.util.extensions.hash
import dev.msfjarvis.aps.util.extensions.time
import dev.msfjarvis.aps.util.extensions.unsafeLazy
import logcat.LogPriority.ERROR
import logcat.logcat
import org.eclipse.jgit.api.Git
import org.eclipse.jgit.revwalk.RevCommit
private val TAG = GitLogModel::class.java.simpleName
private fun commits(): Iterable<RevCommit> {
val repo = PasswordRepository.getRepository(null)
if (repo == null) {
logcat(TAG, ERROR) { "Could not access git repository" }
return listOf()
}
return runCatching { Git(repo).log().call() }.getOrElse { e ->
logcat(TAG, ERROR) { e.asLog("Failed to obtain git commits") }
listOf()
}
}
/**
* Provides [GitCommit] s from a git-log of the password git repository.
*
* All commits are acquired on the first request to this object.
*/
class GitLogModel {
// All commits are acquired here at once. Acquiring the commits in batches would not have been
// entirely sensible because the amount of computation required to obtain commit number n from
// the log includes the amount of computation required to obtain commit number n-1 from the log.
// This is because the commit graph is walked from HEAD to the last commit to obtain.
// Additionally, tests with 1000 commits in the log have not produced a significant delay in the
// user experience.
private val cache: MutableList<GitCommit> by unsafeLazy {
commits()
.map { GitCommit(it.hash, it.shortMessage, it.authorIdent.name, it.time) }
.toMutableList()
}
val size = cache.size
fun get(index: Int): GitCommit? {
if (index >= size)
logcat(ERROR) { "Cannot get git commit with index $index. There are only $size." }
return cache.getOrNull(index)
}
}
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