Add support for structured output formatters.

[notmuch] / sprinter.h

diff --git a/sprinter.h b/sprinter.h
new file mode 100644 (file)
index 0000000..77dc26f
--- /dev/null
+++ b/sprinter.h
@@ -0,0 +1,58 @@
+#ifndef NOTMUCH_SPRINTER_H
+#define NOTMUCH_SPRINTER_H
+
+/* Necessary for notmuch_bool_t */
+#include "notmuch-client.h"
+
+/* Structure printer interface. This is used to create output
+ * structured as maps (with key/value pairs), lists and primitives
+ * (strings, integers and booleans).
+ */
+typedef struct sprinter {
+    /* 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.
+     */
+    void (*begin_map) (struct sprinter *);
+
+    /* Start a new list/array structure.
+     */
+    void (*begin_list) (struct sprinter *);
+
+    /* End the last opened list or map structure.
+     */
+    void (*end) (struct sprinter *);
+
+    /* Print one string/integer/boolean/null element (possibly inside a
+     * list or map, followed or preceded by separators).
+     * For string, the char * must be UTF-8 encoded.
+     */
+    void (*string) (struct sprinter *, const char *);
+    void (*integer) (struct sprinter *, int);
+    void (*boolean) (struct sprinter *, notmuch_bool_t);
+    void (*null) (struct sprinter *);
+
+    /* Print the key of a map's key/value pair. The char * must be UTF-8
+     * encoded.
+     */
+    void (*map_key) (struct sprinter *, const char *);
+
+    /* Insert a separator (usually extra whitespace) for improved
+     * readability without affecting the abstract syntax of the
+     * structure being printed.
+     * For JSON, this could simply be a line break.
+     */
+    void (*separator) (struct sprinter *);
+
+    /* Set the current string prefix. This only affects the text
+     * printer, which will print this string, followed by a colon,
+     * before any string. For other printers, this does nothing.
+     */
+    void (*set_prefix) (struct sprinter *, const char *);
+
+    /* True if this is the special-cased plain text printer.
+     */
+    notmuch_bool_t is_text_printer;
+} sprinter_t;
+
+#endif // NOTMUCH_SPRINTER_H