git-merge-recursive: learn to honor merge.conflictstyle

This teaches the low-level ll_xdl_merge() routine to honor
merge.conflictstyle configuration variable, so that merge-recursive
strategy can show the conflicts in the style of user's choice.

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

builtin-merge-recursive.c

@@ -1348,7 +1348,7 @@ static int merge_config(const char *var, const char *value, void *cb)
 		merge_rename_limit = git_config_int(var, value);
 		return 0;
 	}
-	return git_default_config(var, value, cb);
+	return git_xmerge_config(var, value, cb);
 }
 
 int cmd_merge_recursive(int argc, const char **argv, const char *prefix)

ll-merge.c

@@ -63,6 +63,7 @@ static int ll_xdl_merge(const struct ll_merge_driver *drv_unused,
 			int virtual_ancestor)
 {
 	xpparam_t xpp;
+	int style = 0;
 
 	if (buffer_is_binary(orig->ptr, orig->size) ||
 	    buffer_is_binary(src1->ptr, src1->size) ||
@@ -77,10 +78,12 @@ static int ll_xdl_merge(const struct ll_merge_driver *drv_unused,
 	}
 
 	memset(&xpp, 0, sizeof(xpp));
+	if (git_xmerge_style >= 0)
+		style = git_xmerge_style;
 	return xdl_merge(orig,
 			 src1, name1,
 			 src2, name2,
-			 &xpp, XDL_MERGE_ZEALOUS,
+			 &xpp, XDL_MERGE_ZEALOUS | style,
 			 result);
 }
 
@@ -95,10 +98,15 @@ static int ll_union_merge(const struct ll_merge_driver *drv_unused,
 	char *src, *dst;
 	long size;
 	const int marker_size = 7;
+	int status, saved_style;
 
-	int status = ll_xdl_merge(drv_unused, result, path_unused,
+	/* We have to force the RCS "merge" style */
+	saved_style = git_xmerge_style;
+	git_xmerge_style = 0;
+	status = ll_xdl_merge(drv_unused, result, path_unused,
 			      orig, src1, NULL, src2, NULL,
 			      virtual_ancestor);
+	git_xmerge_style = saved_style;
 	if (status <= 0)
 		return status;
 	size = result->size;