Make bisect playable and validate commit_in_future using Git author timestamps

app/src/main/java/solutions/tretter/githugandroid/RepoStateSaver.kt

@@ -8,7 +8,7 @@ val RepoStateSaver = listSaver<RepoState, Any>(
             state.initialized,
             state.headBranch,
             state.files.flatMap { listOf(it.name, it.content, it.staged.toString(), it.tracked.toString(), it.deleted.toString()) },
-            state.commits.flatMap { listOf(it.id, it.message) },
+            state.commits.flatMap { listOf(it.id, it.message, it.authorTimestampSeconds?.toString().orEmpty()) },
             state.branches.flatMap { listOf(it.key, it.value.toString()) },
             state.currentDir,
             state.tags,
@@ -53,9 +53,7 @@ val RepoStateSaver = listSaver<RepoState, Any>(
                     deleted = (it.getOrNull(4) as? String)?.toBoolean() ?: false,
                 )
             },
-            commits = commitParts.chunked(2).map {
-                CommitNode(it[0] as String, it[1] as String)
-            },
+            commits = commitParts.restoreCommitNodes(),
             branches = branchParts.chunked(2).associate { (it[0] as String) to (it[1] as String).toInt() },
             currentDir = saved[5] as String,
             tags = tags.filterIsInstance<String>(),
@@ -77,3 +75,21 @@ val RepoStateSaver = listSaver<RepoState, Any>(
         )
     }
 )
+
+private fun List<*>.restoreCommitNodes(): List<CommitNode> {
+    val hasTimestampColumn = size % 3 == 0 && chunked(3).all { chunk ->
+        val timestamp = chunk.getOrNull(2) as? String
+        timestamp.isNullOrEmpty() || timestamp.toLongOrNull()?.let { it >= 100_000_000L } == true
+    }
+    val width = if (hasTimestampColumn) 3 else 2
+
+    return chunked(width).mapNotNull { chunk ->
+        val id = chunk.getOrNull(0) as? String ?: return@mapNotNull null
+        val message = chunk.getOrNull(1) as? String ?: ""
+        CommitNode(
+            id = id,
+            message = message,
+            authorTimestampSeconds = if (hasTimestampColumn) (chunk.getOrNull(2) as? String)?.toLongOrNull() else null,
+        )
+    }
+}