Re: [PATCH v2 04/10] dir.c: dump "UNTR" extension as json

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On 6/24/2019 9:02 AM, Nguyễn Thái Ngọc Duy wrote:
The big part of UNTR extension is dumped at the end instead of dumping
as soon as we read it, because we actually "patch" some fields in
untracked_cache_dir with EWAH bitmaps at the end.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
  dir.c                    | 57 +++++++++++++++++++++++++++++++++++++++-
  dir.h                    |  4 ++-
  json-writer.h            |  6 +++++
  read-cache.c             |  2 +-
  t/t3011-ls-files-json.sh |  3 ++-
  t/t3011/basic            | 39 +++++++++++++++++++++++++++
  6 files changed, 107 insertions(+), 4 deletions(-)

diff --git a/dir.c b/dir.c
index ba4a51c296..8808577ea3 100644
--- a/dir.c
+++ b/dir.c
@@ -19,6 +19,7 @@
  #include "varint.h"
  #include "ewah/ewok.h"
  #include "fsmonitor.h"
+#include "json-writer.h"
  #include "submodule-config.h"
/*
@@ -2826,7 +2827,42 @@ static void load_oid_stat(struct oid_stat *oid_stat, const unsigned char *data,
  	oid_stat->valid = 1;
  }
-struct untracked_cache *read_untracked_extension(const void *data, unsigned long sz)
+static void jw_object_oid_stat(struct json_writer *jw, const char *key,
+			       const struct oid_stat *oid_stat)

I was hoping to reserve the jw_, jw_object_, and jw_array_ prefixes
to refer to public functions in the json-writer.[ch] files, rather
than private functions elsewhere in the code.  I think it is less
confusing that way.  IMHO.

It's fine to have such helper functions for local structure types,
but I think it'd be better for them to not be named like other
public functions.

+{
+	jw_object_inline_begin_object(jw, key);
+	jw_object_bool(jw, "valid", oid_stat->valid);
+	jw_object_string(jw, "oid", oid_to_hex(&oid_stat->oid));
+	jw_object_stat_data(jw, "stat", &oid_stat->stat);
+	jw_end(jw);
+}
+
+static void jw_object_untracked_cache_dir(struct json_writer *jw,
+					  const struct untracked_cache_dir *ucd)
+{
+	int i;
+
+	jw_object_bool(jw, "valid", ucd->valid);
+	jw_object_bool(jw, "check-only", ucd->check_only);
+	jw_object_stat_data(jw, "stat", &ucd->stat_data);
+	jw_object_string(jw, "exclude-oid", oid_to_hex(&ucd->exclude_oid));
+	jw_object_inline_begin_array(jw, "untracked");
+	for (i = 0; i < ucd->untracked_nr; i++)
+		jw_array_string(jw, ucd->untracked[i]);
+	jw_end(jw);
+
+	jw_object_inline_begin_object(jw, "dirs");
+	for (i = 0; i < ucd->dirs_nr; i++) {
+		jw_object_inline_begin_object(jw, ucd->dirs[i]->name);
+		jw_object_untracked_cache_dir(jw, ucd->dirs[i]);
+		jw_end(jw);
+	}
+	jw_end(jw);
+}
+
+struct untracked_cache *read_untracked_extension(const void *data,
+						 unsigned long sz,
+						 struct json_writer *jw)
  {
  	struct untracked_cache *uc;
  	struct read_data rd;
@@ -2864,6 +2900,19 @@ struct untracked_cache *read_untracked_extension(const void *data, unsigned long
  	uc->dir_flags = get_be32(next + ouc_offset(dir_flags));
  	exclude_per_dir = (const char *)next + exclude_per_dir_offset;
  	uc->exclude_per_dir = xstrdup(exclude_per_dir);
+
+	if (jw) {
+		jw_object_string(jw, "ident", ident);
+		jw_object_oid_stat(jw, "info_exclude", &uc->ss_info_exclude);
+		jw_object_oid_stat(jw, "excludes_file", &uc->ss_excludes_file);
+		jw_object_intmax(jw, "flags", uc->dir_flags);
+		if (uc->dir_flags & DIR_SHOW_OTHER_DIRECTORIES)
+			jw_object_bool(jw, "show_other_directories", 1);
+		if (uc->dir_flags & DIR_HIDE_EMPTY_DIRECTORIES)
+			jw_object_bool(jw, "hide_empty_directories", 1);
+		jw_object_string(jw, "excludes_per_dir", uc->exclude_per_dir);
+	}
+
  	/* NUL after exclude_per_dir is covered by sizeof(*ouc) */
  	next += exclude_per_dir_offset + strlen(exclude_per_dir) + 1;
  	if (next >= end)
@@ -2905,6 +2954,12 @@ struct untracked_cache *read_untracked_extension(const void *data, unsigned long
  	ewah_each_bit(rd.sha1_valid, read_oid, &rd);
  	next = rd.data;
+ if (jw) {
+		jw_object_inline_begin_object(jw, "root");
+		jw_object_untracked_cache_dir(jw, uc->root);
+		jw_end(jw);
+	}
+
  done:
  	free(rd.ucd);
  	ewah_free(rd.valid);
diff --git a/dir.h b/dir.h
index 680079bbe3..80efdd05c4 100644
--- a/dir.h
+++ b/dir.h
@@ -6,6 +6,8 @@
  #include "cache.h"
  #include "strbuf.h"
+struct json_writer;
+
  struct dir_entry {
  	unsigned int len;
  	char name[FLEX_ARRAY]; /* more */
@@ -362,7 +364,7 @@ void untracked_cache_remove_from_index(struct index_state *, const char *);
  void untracked_cache_add_to_index(struct index_state *, const char *);
void free_untracked_cache(struct untracked_cache *);
-struct untracked_cache *read_untracked_extension(const void *data, unsigned long sz);
+struct untracked_cache *read_untracked_extension(const void *data, unsigned long sz, struct json_writer *jw);
  void write_untracked_extension(struct strbuf *out, struct untracked_cache *untracked);
  void add_untracked_cache(struct index_state *istate);
  void remove_untracked_cache(struct index_state *istate);
diff --git a/json-writer.h b/json-writer.h
index c48c4cbf33..c3d0fbd1ef 100644
--- a/json-writer.h
+++ b/json-writer.h
@@ -121,6 +121,12 @@ static inline void jw_object_inline_begin_array_gently(struct json_writer *jw,
  		jw_object_inline_begin_array(jw, name);
  }
+static inline void jw_array_inline_begin_object_gently(struct json_writer *jw)
+{
+	if (jw)
+		jw_array_inline_begin_object(jw);
+}
+
  static inline void jw_end_gently(struct json_writer *jw)
  {
  	if (jw)

I'm not sure about the need for these _gently versions, but
maybe make them macros in json-writer.h

Jeff



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