Implement 'notmuch dump'.

This is a fairly big milestone for notmuch. It's our first command
to do anything besides building the index, so it proves we can
actually read valid results out from the index.

It also puts in place almost all of the API and infrastructure we
will need to allow searching of the database.

Finally, with this change we are now using talloc inside of notmuch
which is truly a delight to use. And now that I figured out how
to use C++ objects with talloc allocation, (it requires grotty
parts of C++ such as "placement new" and "explicit destructors"),
we are valgrind-clean for "notmuch dump", (as in "no leaks are
possible").

1 files changed, 32 insertions, 0 deletions

diff --git a/notmuch-private.h b/notmuch-private.h
index 0c20a3c..728c1a6 100644
--- a/notmuch-private.h
+++ b/notmuch-private.h
@@ -41,6 +41,31 @@
 
 NOTMUCH_BEGIN_DECLS
 
+#include <talloc.h>
+
+
+/* Thanks to Andrew Tridgell's (SAMBA's) talloc for this definition of
+ * unlikely. The talloc source code comes to us via the GNU LGPL v. 3.
+ */
+/* these macros gain us a few percent of speed on gcc */
+#if (__GNUC__ >= 3)
+/* the strange !! is to ensure that __builtin_expect() takes either 0 or 1
+   as its first argument */
+#ifndef likely
+#define likely(x)   __builtin_expect(!!(x), 1)
+#endif
+#ifndef unlikely
+#define unlikely(x) __builtin_expect(!!(x), 0)
+#endif
+#else
+#ifndef likely
+#define likely(x) (x)
+#endif
+#ifndef unlikely
+#define unlikely(x) (x)
+#endif
+#endif
+
 /* xutil.c */
 void *
 xcalloc (size_t nmemb, size_t size);
@@ -57,6 +82,13 @@ xstrdup (const char *s);
 char *
 xstrndup (const char *s, size_t n);
 
+/* message.cc */
+
+notmuch_message_t *
+_notmuch_message_create (notmuch_results_t *owner,
+			 notmuch_database_t *notmuch,
+			 unsigned int doc_id);
+
 /* message-file.c */
 
 /* XXX: I haven't decided yet whether these will actually get exported