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-rw-r--r--diffcore-rotate.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/diffcore-rotate.c b/diffcore-rotate.c
new file mode 100644
index 0000000..445f060
--- /dev/null
+++ b/diffcore-rotate.c
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2021, Google LLC.
+ * Based on diffcore-order.c, which is Copyright (C) 2005, Junio C Hamano
+ */
+#include "cache.h"
+#include "diff.h"
+#include "diffcore.h"
+
+void diffcore_rotate(struct diff_options *opt)
+{
+ struct diff_queue_struct *q = &diff_queued_diff;
+ struct diff_queue_struct outq;
+ int rotate_to, i;
+
+ if (!q->nr)
+ return;
+
+ for (i = 0; i < q->nr; i++) {
+ int cmp = strcmp(opt->rotate_to, q->queue[i]->two->path);
+ if (!cmp)
+ break; /* exact match */
+ if (!opt->rotate_to_strict && cmp < 0)
+ break; /* q->queue[i] is now past the target pathname */
+ }
+
+ if (q->nr <= i) {
+ /* we did not find the specified path */
+ if (opt->rotate_to_strict)
+ die(_("No such path '%s' in the diff"), opt->rotate_to);
+ return;
+ }
+
+ DIFF_QUEUE_CLEAR(&outq);
+ rotate_to = i;
+
+ for (i = rotate_to; i < q->nr; i++)
+ diff_q(&outq, q->queue[i]);
+ for (i = 0; i < rotate_to; i++) {
+ if (opt->skip_instead_of_rotate)
+ diff_free_filepair(q->queue[i]);
+ else
+ diff_q(&outq, q->queue[i]);
+ }
+ free(q->queue);
+ *q = outq;
+}