add merge.renamelimit config option

The point of rename limiting is to bound the amount of time
we spend figuring out inexact renames. Currently we use a
single value, diff.renamelimit, for all situations. However,
it is probably the case that a user is willing to spend more
time finding renames during a merge than they are while
looking at git-log.

This patch provides a way of setting those values separately
(though for backwards compatibility, merge still falls back
on the diff renamelimit).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/merge-config.txt b/Documentation/merge-config.txt
index 9719311b42f1beadeca752888dbd12a05ce511f8..48ce747cf4dad592d642735856eb156e93d6cf30 100644 (file)
--- a/Documentation/merge-config.txt
+++ b/Documentation/merge-config.txt
@@ -6,6 +6,11 @@ merge.log::
        Whether to include summaries of merged commits in newly created
        merge commit messages. False by default.
 
+merge.renameLimit::
+       The number of files to consider when performing rename detection
+       during a merge; if not specified, defaults to the value of
+       diff.renameLimit.
+
 merge.tool::
        Controls which merge resolution program is used by
        linkgit:git-mergetool[1].  Valid built-in values are: "kdiff3",

diff --git a/builtin-merge-recursive.c b/builtin-merge-recursive.c
index 910c0d20e7ba1128c705a49bfd9966212c5420b2..1293e3d342de89b6a8fe81c54a1abd16418acba8 100644 (file)
--- a/builtin-merge-recursive.c
+++ b/builtin-merge-recursive.c
@@ -92,7 +92,8 @@ static struct path_list current_directory_set = {NULL, 0, 0, 1};
 
 static int call_depth = 0;
 static int verbosity = 2;
-static int rename_limit = -1;
+static int diff_rename_limit = -1;
+static int merge_rename_limit = -1;
 static int buffer_output = 1;
 static struct strbuf obuf = STRBUF_INIT;
 
@@ -361,7 +362,9 @@ static struct path_list *get_renames(struct tree *tree,
        diff_setup(&opts);
        DIFF_OPT_SET(&opts, RECURSIVE);
        opts.detect_rename = DIFF_DETECT_RENAME;
-       opts.rename_limit = rename_limit;
+       opts.rename_limit = merge_rename_limit >= 0 ? merge_rename_limit :
+                           diff_rename_limit >= 0 ? diff_rename_limit :
+                           100;
        opts.output_format = DIFF_FORMAT_NO_OUTPUT;
        if (diff_setup_done(&opts) < 0)
                die("diff setup failed");
@@ -1343,7 +1346,11 @@ static int merge_config(const char *var, const char *value)
                return 0;
        }
        if (!strcasecmp(var, "diff.renamelimit")) {
-               rename_limit = git_config_int(var, value);
+               diff_rename_limit = git_config_int(var, value);
+               return 0;
+       }
+       if (!strcasecmp(var, "merge.renamelimit")) {
+               merge_rename_limit = git_config_int(var, value);
                return 0;
        }
        return git_default_config(var, value);

diff --git a/t/t6032-merge-large-rename.sh b/t/t6032-merge-large-rename.sh
new file mode 100755 (executable)
index 0000000..eac5eba
--- /dev/null
+++ b/t/t6032-merge-large-rename.sh
@@ -0,0 +1,73 @@
+#!/bin/sh
+
+test_description='merging with large rename matrix'
+. ./test-lib.sh
+
+count() {
+       i=1
+       while test $i -le $1; do
+               echo $i
+               i=$(($i + 1))
+       done
+}
+
+test_expect_success 'setup (initial)' '
+       touch file &&
+       git add . &&
+       git commit -m initial &&
+       git tag initial
+'
+
+make_text() {
+       echo $1: $2
+       for i in `count 20`; do
+               echo $1: $i
+       done
+       echo $1: $3
+}
+
+test_rename() {
+       test_expect_success "rename ($1, $2)" '
+       n='$1'
+       expect='$2'
+       git checkout -f master &&
+       git branch -D test$n || true &&
+       git reset --hard initial &&
+       for i in $(count $n); do
+               make_text $i initial initial >$i
+       done &&
+       git add . &&
+       git commit -m add=$n &&
+       for i in $(count $n); do
+               make_text $i changed initial >$i
+       done &&
+       git commit -a -m change=$n &&
+       git checkout -b test$n HEAD^ &&
+       for i in $(count $n); do
+               git rm $i
+               make_text $i initial changed >$i.moved
+       done &&
+       git add . &&
+       git commit -m change+rename=$n &&
+       case "$expect" in
+               ok) git merge master ;;
+                *) test_must_fail git merge master ;;
+       esac
+       '
+}
+
+test_rename 5 ok
+
+test_expect_success 'set diff.renamelimit to 4' '
+       git config diff.renamelimit 4
+'
+test_rename 4 ok
+test_rename 5 fail
+
+test_expect_success 'set merge.renamelimit to 5' '
+       git config merge.renamelimit 5
+'
+test_rename 5 ok
+test_rename 6 fail
+
+test_done