lib: add json API to dump and override row naming convention

The following table is not compliant with caml format when displayed in
json:

>                 ttable_add_row(
>                         tt,
>                         "Vertex|Type|Metric|Next-Hop|Interface|Parent");
>
>                 ttable_json(tt, "ssdsss");

output observed:

> [..]
>        {
>          "Vertex":"r1",
>          "Type":"",
>          "Metric":0,
>          "Next-Hop":"",
>          "Interface":"",
>          "Parent":""
>        }

output expected:

> [..]
>        {
>          "vertex":"r1",
>          "type":"",
>          "metric":0,
>          "nextHop":"",
>          "interface":"",
>          "parent":""
>        }

Override the ttable_json() function with a new function which has an
extra paramter: this parameter will redefine the initial row value for
json:

> ttable_json_with_json_text(tt,
> "vertex|type|metric|nextHop|interface|parent");

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/termtable.h b/lib/termtable.h
index 7258682bd8..0782c82abd 100644
--- a/lib/termtable.h
+++ b/lib/termtable.h
@@ -289,6 +289,21 @@ char *ttable_dump(struct ttable *tt, const char *newline);
  */
 json_object *ttable_json(struct ttable *tt, const char *const formats);
 
+/**
+ * Convert a table to a JSON array of objects.
+ *
+ * Caller must free the returned json_object structure.
+ *
+ * @param tt the table to convert
+ * @param formats an array of characters indicating what JSON type should be
+ * used.
+ * @param formats an optinal string of row headers that overrids the first row of the table.
+ * This is useful to get naming convention that align with caml Format.
+ */
+json_object *ttable_json_with_json_text(struct ttable *tt,
+					const char *const formats,
+					const char *json_override_text);
+
 #ifdef __cplusplus
 }
 #endif