[PATCH 6/7] xdiff: simplify style assignments

[Felipe Contreras <felipe.contreras@gmail.com>]

There is little value in checking that git_xmerge_style isn't 0 before
changing it's default value.

Most of the time it isn't 0 anyway, so just assign the value directly.

Also, add the missing constant for the default value: XDL_MERGE_STYLE_MERGE.

Additionally this change has the benefit that it gets rid of a Yoda
condition.

No functional changes.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
---
 builtin/merge-file.c | 3 +--
 ll-merge.c           | 3 +--
 xdiff-interface.c    | 4 ++--
 xdiff/xdiff.h        | 1 +
 4 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/builtin/merge-file.c b/builtin/merge-file.c
index a4097a596f..01951762ec 100644
--- a/builtin/merge-file.c
+++ b/builtin/merge-file.c
@@ -55,8 +55,7 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
 	if (startup_info->have_repository) {
 		/* Read the configuration file */
 		git_config(git_xmerge_config, NULL);
-		if (0 <= git_xmerge_style)
-			xmp.style = git_xmerge_style;
+		xmp.style = git_xmerge_style;
 	}
 
 	argc = parse_options(argc, argv, prefix, options, merge_file_usage, 0);
diff --git a/ll-merge.c b/ll-merge.c
index 9a8a2c365c..4ce8d3f9cc 100644
--- a/ll-merge.c
+++ b/ll-merge.c
@@ -124,8 +124,7 @@ static int ll_xdl_merge(const struct ll_merge_driver *drv_unused,
 	xmp.level = XDL_MERGE_ZEALOUS;
 	xmp.favor = opts->variant;
 	xmp.xpp.flags = opts->xdl_opts;
-	if (git_xmerge_style >= 0)
-		xmp.style = git_xmerge_style;
+	xmp.style = git_xmerge_style;
 	if (marker_size > 0)
 		xmp.marker_size = marker_size;
 	xmp.ancestor = orig_name;
diff --git a/xdiff-interface.c b/xdiff-interface.c
index 64e2c4e301..19a030fbe2 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -299,7 +299,7 @@ int xdiff_compare_lines(const char *l1, long s1,
 	return xdl_recmatch(l1, s1, l2, s2, flags);
 }
 
-int git_xmerge_style = -1;
+int git_xmerge_style = XDL_MERGE_STYLE_MERGE;
 
 int git_xmerge_config(const char *var, const char *value, void *cb)
 {
@@ -309,7 +309,7 @@ int git_xmerge_config(const char *var, const char *value, void *cb)
 		if (!strcmp(value, "diff3"))
 			git_xmerge_style = XDL_MERGE_STYLE_DIFF3;
 		else if (!strcmp(value, "merge"))
-			git_xmerge_style = 0;
+			git_xmerge_style = XDL_MERGE_STYLE_MERGE;
 		/*
 		 * Please update _git_checkout() in
 		 * git-completion.bash when you add new merge config
diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index 45883f5eb3..d24cd9f6ae 100644
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -64,6 +64,7 @@ extern "C" {
 #define XDL_MERGE_FAVOR_UNION 3
 
 /* merge output styles */
+#define XDL_MERGE_STYLE_MERGE 0
 #define XDL_MERGE_STYLE_DIFF3 1
 
 typedef struct s_mmfile {
-- 
2.32.0.2.g41be0a4e50