[PATCH v2 1/2] merge: Add merge.renames config setting

[Ben Peart <Ben.Peart@microsoft.com>]

Add the ability to control rename detection for merge via a config setting.

Reviewed-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Ben Peart <benpeart@microsoft.com>
---
 Documentation/diff-config.txt      | 3 ++-
 Documentation/merge-config.txt     | 8 +++++++-
 Documentation/merge-strategies.txt | 6 ++++--
 builtin/merge.c                    | 1 +
 merge-recursive.c                  | 1 +
 5 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/Documentation/diff-config.txt b/Documentation/diff-config.txt
index 5ca942ab5e..77caa66c2f 100644
--- a/Documentation/diff-config.txt
+++ b/Documentation/diff-config.txt
@@ -112,7 +112,8 @@ diff.orderFile::
 
 diff.renameLimit::
 	The number of files to consider when performing the copy/rename
-	detection; equivalent to the 'git diff' option `-l`.
+	detection; equivalent to the 'git diff' option `-l`. This setting
+	has no effect if rename detection is turned off.
 
 diff.renames::
 	Whether and how Git detects renames.  If set to "false",
diff --git a/Documentation/merge-config.txt b/Documentation/merge-config.txt
index 12b6bbf591..0540c44e23 100644
--- a/Documentation/merge-config.txt
+++ b/Documentation/merge-config.txt
@@ -35,7 +35,13 @@ include::fmt-merge-msg-config.txt[]
 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.
+	diff.renameLimit. This setting has no effect if rename detection
+	is turned off.
+
+merge.renames::
+	Whether and how Git detects renames.  If set to "false",
+	rename detection is disabled. If set to "true", basic rename
+	detection is enabled. This is the default.
 
 merge.renormalize::
 	Tell Git that canonical representation of files in the
diff --git a/Documentation/merge-strategies.txt b/Documentation/merge-strategies.txt
index 4a58aad4b8..1e0728aa12 100644
--- a/Documentation/merge-strategies.txt
+++ b/Documentation/merge-strategies.txt
@@ -84,12 +84,14 @@ no-renormalize;;
 	`merge.renormalize` configuration variable.
 
 no-renames;;
-	Turn off rename detection.
+	Turn off rename detection. This overrides the `merge.renames`
+	configuration variable.
 	See also linkgit:git-diff[1] `--no-renames`.
 
 find-renames[=<n>];;
 	Turn on rename detection, optionally setting the similarity
-	threshold.  This is the default.
+	threshold.  This is the default. This overrides the
+	'merge.renames' configuration variable.
 	See also linkgit:git-diff[1] `--find-renames`.
 
 rename-threshold=<n>;;
diff --git a/builtin/merge.c b/builtin/merge.c
index 8746c5e3e8..3be52cd316 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -424,6 +424,7 @@ static void finish(struct commit *head_commit,
 		opts.output_format |=
 			DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
 		opts.detect_rename = DIFF_DETECT_RENAME;
+		git_config_get_bool("merge.renames", &opts.detect_rename);
 		diff_setup_done(&opts);
 		diff_tree_oid(head, new_head, "", &opts);
 		diffcore_std(&opts);
diff --git a/merge-recursive.c b/merge-recursive.c
index 9c05eb7f70..cd5367e890 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -3256,6 +3256,7 @@ static void merge_recursive_config(struct merge_options *o)
 	git_config_get_int("merge.verbosity", &o->verbosity);
 	git_config_get_int("diff.renamelimit", &o->diff_rename_limit);
 	git_config_get_int("merge.renamelimit", &o->merge_rename_limit);
+	git_config_get_bool("merge.renames", &o->detect_rename);
 	git_config(git_xmerge_config, NULL);
 }
 
-- 
2.17.0.windows.1