[PATCH v2 05/10] split-index.c: dump "link" extension as json

[Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
 json-writer.c             | 14 ++++++++++++++
 json-writer.h             |  3 +++
 split-index.c             |  9 ++++++++-
 t/t3011-ls-files-json.sh  | 14 ++++++++++++++
 t/t3011/split-index (new) | 39 +++++++++++++++++++++++++++++++++++++++
 5 files changed, 78 insertions(+), 1 deletion(-)

diff --git a/json-writer.c b/json-writer.c
index 0608726512..c0bd302e4e 100644
--- a/json-writer.c
+++ b/json-writer.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "ewah/ewok.h"
 #include "json-writer.h"
 
 void jw_init(struct json_writer *jw)
@@ -224,6 +225,19 @@ void jw_object_stat_data(struct json_writer *jw, const char *name,
 	jw_end(jw);
 }
 
+static void dump_ewah_one(size_t pos, void *jw)
+{
+	jw_array_intmax(jw, pos);
+}
+
+void jw_object_ewah(struct json_writer *jw, const char *key,
+		    struct ewah_bitmap *ewah)
+{
+	jw_object_inline_begin_array(jw, key);
+	ewah_each_bit(ewah, dump_ewah_one, jw);
+	jw_end(jw);
+}
+
 static void increase_indent(struct strbuf *sb,
 			    const struct json_writer *jw,
 			    int indent)
diff --git a/json-writer.h b/json-writer.h
index c3d0fbd1ef..07d841d52a 100644
--- a/json-writer.h
+++ b/json-writer.h
@@ -45,6 +45,7 @@
 #include "git-compat-util.h"
 #include "strbuf.h"
 
+struct ewah_bitmap;
 struct stat_data;
 
 struct json_writer
@@ -87,6 +88,8 @@ void jw_object_null(struct json_writer *jw, const char *key);
 void jw_object_filemode(struct json_writer *jw, const char *key, mode_t value);
 void jw_object_stat_data(struct json_writer *jw, const char *key,
 			 const struct stat_data *sd);
+void jw_object_ewah(struct json_writer *jw, const char *key,
+		    struct ewah_bitmap *ewah);
 void jw_object_sub_jw(struct json_writer *jw, const char *key,
 		      const struct json_writer *value);
 
diff --git a/split-index.c b/split-index.c
index e6154e4ea9..41552bf771 100644
--- a/split-index.c
+++ b/split-index.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "json-writer.h"
 #include "split-index.h"
 #include "ewah/ewok.h"
 
@@ -25,7 +26,7 @@ int read_link_extension(struct index_state *istate,
 	data += the_hash_algo->rawsz;
 	sz -= the_hash_algo->rawsz;
 	if (!sz)
-		return 0;
+		goto done;
 	si->delete_bitmap = ewah_new();
 	ret = ewah_read_mmap(si->delete_bitmap, data, sz);
 	if (ret < 0)
@@ -38,6 +39,12 @@ int read_link_extension(struct index_state *istate,
 		return error("corrupt replace bitmap in link extension");
 	if (ret != sz)
 		return error("garbage at the end of link extension");
+done:
+	if (istate->jw) {
+		jw_object_string(istate->jw, "oid", oid_to_hex(&si->base_oid));
+		jw_object_ewah(istate->jw, "delete_bitmap", si->delete_bitmap);
+		jw_object_ewah(istate->jw, "replace_bitmap", si->replace_bitmap);
+	}
 	return 0;
 }
 
diff --git a/t/t3011-ls-files-json.sh b/t/t3011-ls-files-json.sh
index 082fe8e966..dbb572ce9d 100755
--- a/t/t3011-ls-files-json.sh
+++ b/t/t3011-ls-files-json.sh
@@ -44,4 +44,18 @@ test_expect_success 'ls-files --json, main entries, UNTR and TREE' '
 	compare_json basic
 '
 
+test_expect_success 'ls-files --json, split index' '
+	git init split &&
+	(
+		cd split &&
+		echo one >one &&
+		git add one &&
+		git update-index --split-index &&
+		echo updated >>one &&
+		test_must_fail git -c splitIndex.maxPercentChange=100 update-index --refresh &&
+		cp ../filter.sed . &&
+		compare_json split-index
+	)
+'
+
 test_done
diff --git a/t/t3011/split-index b/t/t3011/split-index
new file mode 100644
index 0000000000..cdcc4ddded
--- /dev/null
+++ b/t/t3011/split-index
@@ -0,0 +1,39 @@
+{
+  "version": 2,
+  "oid": <string>,
+  "mtime_sec": <number>,
+  "mtime_nsec": <number>,
+  "entries": [
+    {
+      "id": 0,
+      "name": "",
+      "mode": "100644",
+      "flags": 0,
+      "oid": <string>,
+      "stat": {
+        "ctime_sec": <number>,
+        "ctime_nsec": <number>,
+        "mtime_sec": <number>,
+        "mtime_nsec": <number>,
+        "device": <number>,
+        "inode": <number>,
+        "uid": <number>,
+        "gid": <number>,
+        "size": 4
+      },
+      "file_offset": <number>
+    }
+  ],
+  "extensions": {
+    "link": {
+      "file_offset": <number>,
+      "ext_size": <number>,
+      "oid": <string>,
+      "delete_bitmap": [
+      ],
+      "replace_bitmap": [
+        0
+      ]
+    }
+  }
+}
-- 
2.22.0.rc0.322.g2b0371e29a