[PATCH 1/4] lib: add passthrough logger function

[David Bremner]

As a first step to eliminating all the fprintfs in the library, make a
logger function that just calls fprintf. This is a bit more complex
than needed, because we want to do something more interesting with the
formatted string in the future.
---
 lib/database.cc | 19 +++++++++++++++++++
 lib/notmuch.h   | 10 +++++++++-
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/lib/database.cc b/lib/database.cc
index 3601f9d..f3c62ee 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -916,6 +916,25 @@ notmuch_database_open (const char *path,
     return status;
 }
 
+void
+notmuch_database_log (notmuch_database_t *notmuch,
+		      const char *format,
+		      ...)
+{
+    va_list va_args;
+    const char *message;
+    
+    va_start (va_args, format);
+
+    message = talloc_vasprintf (notmuch, format, va_args);
+
+    /* XXX do something more clever here */
+    fputs (message, stderr);
+
+    talloc_free ((char *)message);
+
+}
+
 notmuch_status_t
 notmuch_database_close (notmuch_database_t *notmuch)
 {
diff --git a/lib/notmuch.h b/lib/notmuch.h
index 220839b..c8c8124 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -279,7 +279,15 @@ notmuch_status_t
 notmuch_database_open (const char *path,
 		       notmuch_database_mode_t mode,
 		       notmuch_database_t **database);
-
+/**
+ * Log a message to where the database is configured to log it
+ *
+ * Initially this does notmuch interesting, since the output is not
+ * yet configurable.
+ */
+void
+notmuch_database_log (notmuch_database_t *notmuch,
+		      const char *format, ...);
 /**
  * Commit changes and close the given notmuch database.
  *
-- 
2.1.3