CLI: stash pointer to database in sprinter structs

We already use an allocated (and presumably open) database as a talloc
context. Keeping the pointer in the allocated struct will allow us to
e.g. interrogate the configuration in a sprinter function without
threading the database all the way through the various levels of function.

notmuch-client.h

@@ -65,7 +65,7 @@ struct sprinter;
 struct notmuch_show_params;
 
 typedef struct notmuch_show_format {
-    struct sprinter *(*new_sprinter)(const void *ctx, FILE *stream);
+    struct sprinter *(*new_sprinter)(notmuch_database_t * db, FILE *stream);
     notmuch_status_t (*part)(const void *ctx, struct sprinter *sprinter,
 			     struct mime_node *node, int indent,
 			     const struct notmuch_show_params *params);

sprinter-json.c

@@ -172,7 +172,7 @@ json_separator (struct sprinter *sp)
 }
 
 struct sprinter *
-sprinter_json_create (const void *ctx, FILE *stream)
+sprinter_json_create (notmuch_database_t *db, FILE *stream)
 {
     static const struct sprinter_json template = {
 	.vtable = {
@@ -192,11 +192,12 @@ sprinter_json_create (const void *ctx, FILE *stream)
     };
     struct sprinter_json *res;
 
-    res = talloc (ctx, struct sprinter_json);
+    res = talloc (db, struct sprinter_json);
     if (! res)
 	return NULL;
 
     *res = template;
+    res->vtable.notmuch = db;
     res->stream = stream;
     return &res->vtable;
 }

sprinter-sexp.c

@@ -207,7 +207,7 @@ sexp_separator (struct sprinter *sp)
 }
 
 struct sprinter *
-sprinter_sexp_create (const void *ctx, FILE *stream)
+sprinter_sexp_create (notmuch_database_t *db, FILE *stream)
 {
     static const struct sprinter_sexp template = {
 	.vtable = {
@@ -227,11 +227,12 @@ sprinter_sexp_create (const void *ctx, FILE *stream)
     };
     struct sprinter_sexp *res;
 
-    res = talloc (ctx, struct sprinter_sexp);
+    res = talloc (db, struct sprinter_sexp);
     if (! res)
 	return NULL;
 
     *res = template;
+    res->vtable.notmuch = db;
     res->stream = stream;
     return &res->vtable;
 }

sprinter-text.c

@@ -114,7 +114,7 @@ text_map_key (unused (struct sprinter *sp), unused (const char *key))
 }
 
 struct sprinter *
-sprinter_text_create (const void *ctx, FILE *stream)
+sprinter_text_create (notmuch_database_t *db, FILE *stream)
 {
     static const struct sprinter_text template = {
 	.vtable = {
@@ -134,21 +134,22 @@ sprinter_text_create (const void *ctx, FILE *stream)
     };
     struct sprinter_text *res;
 
-    res = talloc (ctx, struct sprinter_text);
+    res = talloc (db, struct sprinter_text);
     if (! res)
 	return NULL;
 
     *res = template;
+    res->vtable.notmuch = db;
     res->stream = stream;
     return &res->vtable;
 }
 
 struct sprinter *
-sprinter_text0_create (const void *ctx, FILE *stream)
+sprinter_text0_create (notmuch_database_t *db, FILE *stream)
 {
     struct sprinter *sp;
 
-    sp = sprinter_text_create (ctx, stream);
+    sp = sprinter_text_create (db, stream);
     if (! sp)
 	return NULL;
 

sprinter.h

@@ -9,6 +9,11 @@
  * (strings, integers and booleans).
  */
 typedef struct sprinter {
+    /*
+     * Open notmuch database
+     */
+    notmuch_database_t *notmuch;
+
     /* Start a new map/dictionary structure. This should be followed by
      * a sequence of alternating calls to map_key and one of the
      * value-printing functions until the map is ended by end.
@@ -65,20 +70,20 @@ typedef struct sprinter {
 /* Create a new unstructured printer that emits the default text format
  * for "notmuch search". */
 struct sprinter *
-sprinter_text_create (const void *ctx, FILE *stream);
+sprinter_text_create (notmuch_database_t *db, FILE *stream);
 
 /* Create a new unstructured printer that emits the text format for
  * "notmuch search", with each field separated by a null character
  * instead of the newline character. */
 struct sprinter *
-sprinter_text0_create (const void *ctx, FILE *stream);
+sprinter_text0_create (notmuch_database_t *db, FILE *stream);
 
 /* Create a new structure printer that emits JSON. */
 struct sprinter *
-sprinter_json_create (const void *ctx, FILE *stream);
+sprinter_json_create (notmuch_database_t *db, FILE *stream);
 
 /* Create a new structure printer that emits S-Expressions. */
 struct sprinter *
-sprinter_sexp_create (const void *ctx, FILE *stream);
+sprinter_sexp_create (notmuch_database_t *db, FILE *stream);
 
 #endif // NOTMUCH_SPRINTER_H