diffcore-rename: refactor "too many candidates" logic

Move the logic to a separate function, to be enhanced by later patches in
the series.

While at it, swap the condition used in the if statement from "if it is
too big then do this" to "if it would fit then do this".

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/diffcore-rename.c b/diffcore-rename.c
index df41be56deab60d4d39a45920a1e62b05d0474f6..6ab050d7b2c2fa065edc8e567c4eff0ecf1480c5 100644 (file)
--- a/diffcore-rename.c
+++ b/diffcore-rename.c
@@ -414,11 +414,34 @@ static void record_if_better(struct diff_score m[], struct diff_score *o)
                m[worst] = *o;
 }
 
+static int too_many_rename_candidates(int num_create,
+                                     struct diff_options *options)
+{
+       int rename_limit = options->rename_limit;
+       int num_src = rename_src_nr;
+
+       /*
+        * This basically does a test for the rename matrix not
+        * growing larger than a "rename_limit" square matrix, ie:
+        *
+        *    num_create * num_src > rename_limit * rename_limit
+        *
+        * but handles the potential overflow case specially (and we
+        * assume at least 32-bit integers)
+        */
+       if (rename_limit <= 0 || rename_limit > 32767)
+               rename_limit = 32767;
+       if ((num_create <= rename_limit || num_src <= rename_limit) &&
+           (num_create * num_src <= rename_limit * rename_limit))
+               return 0;
+
+       return 1;
+}
+
 void diffcore_rename(struct diff_options *options)
 {
        int detect_rename = options->detect_rename;
        int minimum_score = options->rename_score;
-       int rename_limit = options->rename_limit;
        struct diff_queue_struct *q = &diff_queued_diff;
        struct diff_queue_struct outq;
        struct diff_score *mx;
@@ -484,19 +507,7 @@ void diffcore_rename(struct diff_options *options)
        if (!num_create)
                goto cleanup;
 
-       /*
-        * This basically does a test for the rename matrix not
-        * growing larger than a "rename_limit" square matrix, ie:
-        *
-        *    num_create * num_src > rename_limit * rename_limit
-        *
-        * but handles the potential overflow case specially (and we
-        * assume at least 32-bit integers)
-        */
-       if (rename_limit <= 0 || rename_limit > 32767)
-               rename_limit = 32767;
-       if ((num_create > rename_limit && num_src > rename_limit) ||
-           (num_create * num_src > rename_limit * rename_limit)) {
+       if (too_many_rename_candidates(num_create, options)) {
                if (options->warn_on_too_large_rename)
                        warning("too many files (created: %d deleted: %d), skipping inexact rename detection", num_create, num_src);
                goto cleanup;