t7603: add new testcases to ensure builtin-commit uses reduce_heads()

diff --git a/read-cache.c b/read-cache.c
index a857c8e12fe4c83e98ccbd772b21fd3e66913ea5..5150c1e14b7384bd443bffb17da2887394237c61 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -8,6 +8,11 @@
 #include "cache-tree.h"
 #include "refs.h"
 #include "dir.h"
+#include "tree.h"
+#include "commit.h"
+#include "diff.h"
+#include "diffcore.h"
+#include "revision.h"
 
 /* Index extensions.
  *
@@ -1483,3 +1488,59 @@ int read_index_unmerged(struct index_state *istate)
        istate->cache_nr = dst - istate->cache;
        return !!last;
 }
+
+struct update_callback_data
+{
+       int flags;
+       int add_errors;
+};
+
+static void update_callback(struct diff_queue_struct *q,
+                           struct diff_options *opt, void *cbdata)
+{
+       int i;
+       struct update_callback_data *data = cbdata;
+
+       for (i = 0; i < q->nr; i++) {
+               struct diff_filepair *p = q->queue[i];
+               const char *path = p->one->path;
+               switch (p->status) {
+               default:
+                       die("unexpected diff status %c", p->status);
+               case DIFF_STATUS_UNMERGED:
+               case DIFF_STATUS_MODIFIED:
+               case DIFF_STATUS_TYPE_CHANGED:
+                       if (add_file_to_index(&the_index, path, data->flags)) {
+                               if (!(data->flags & ADD_CACHE_IGNORE_ERRORS))
+                                       die("updating files failed");
+                               data->add_errors++;
+                       }
+                       break;
+               case DIFF_STATUS_DELETED:
+                       if (data->flags & ADD_CACHE_IGNORE_REMOVAL)
+                               break;
+                       if (!(data->flags & ADD_CACHE_PRETEND))
+                               remove_file_from_index(&the_index, path);
+                       if (data->flags & (ADD_CACHE_PRETEND|ADD_CACHE_VERBOSE))
+                               printf("remove '%s'\n", path);
+                       break;
+               }
+       }
+}
+
+int add_files_to_cache(const char *prefix, const char **pathspec, int flags)
+{
+       struct update_callback_data data;
+       struct rev_info rev;
+       init_revisions(&rev, prefix);
+       setup_revisions(0, NULL, &rev, NULL);
+       rev.prune_data = pathspec;
+       rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+       rev.diffopt.format_callback = update_callback;
+       data.flags = flags;
+       data.add_errors = 0;
+       rev.diffopt.format_callback_data = &data;
+       run_diff_files(&rev, DIFF_RACY_IS_MODIFIED);
+       return !!data.add_errors;
+}
+