[PATCH 2/6] lib: add closure parameter to compact status update callback

[Jani Nikula]

This provides much more flexibility for the caller, and can still be
done without soname bumps.
---
 lib/database.cc   |   14 +++++++++-----
 lib/notmuch.h     |    5 +++--
 notmuch-compact.c |    8 +++-----
 3 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/lib/database.cc b/lib/database.cc
index 3dfea0f..da549b4 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -821,9 +821,11 @@ static int rmtree (const char *path)
 class NotmuchCompactor : public Xapian::Compactor
 {
     notmuch_compact_status_cb_t status_cb;
+    void *status_closure;
 
 public:
-    NotmuchCompactor(notmuch_compact_status_cb_t cb) : status_cb(cb) { }
+    NotmuchCompactor(notmuch_compact_status_cb_t cb, void *closure) :
+	status_cb(cb), status_closure(closure) { }
 
     virtual void
     set_status (const std::string &table, const std::string &status)
@@ -842,7 +844,7 @@ public:
 	    return;
 	}
 
-	status_cb(msg);
+	status_cb(msg, status_closure);
 	talloc_free(msg);
     }
 };
@@ -861,7 +863,8 @@ public:
 notmuch_status_t
 notmuch_database_compact (const char* path,
 			  const char* backup_path,
-			  notmuch_compact_status_cb_t status_cb)
+			  notmuch_compact_status_cb_t status_cb,
+			  void *closure)
 {
     void *local = talloc_new (NULL);
     char *notmuch_path, *xapian_path, *compact_xapian_path;
@@ -909,7 +912,7 @@ notmuch_database_compact (const char* path,
     }
 
     try {
-	NotmuchCompactor compactor(status_cb);
+	NotmuchCompactor compactor(status_cb, closure);
 
 	compactor.set_renumber(false);
 	compactor.add_source(xapian_path);
@@ -947,7 +950,8 @@ DONE:
 notmuch_status_t
 notmuch_database_compact (unused (const char* path),
 			  unused (const char* backup_path),
-			  unused (notmuch_compact_status_cb_t status_cb))
+			  unused (notmuch_compact_status_cb_t status_cb),
+			  unused (void *closure))
 {
     fprintf (stderr, "notmuch was compiled against a xapian version lacking compaction support.\n");
     return NOTMUCH_STATUS_UNSUPPORTED_OPERATION;
diff --git a/lib/notmuch.h b/lib/notmuch.h
index 9dab555..cd301a4 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -219,7 +219,7 @@ notmuch_database_close (notmuch_database_t *database);
 /* A callback invoked by notmuch_database_compact to notify the user
  * of the progress of the compaction process.
  */
-typedef void (*notmuch_compact_status_cb_t)(const char*);
+typedef void (*notmuch_compact_status_cb_t)(const char *message, void *closure);
 
 /* Compact a notmuch database, backing up the original database to the
  * given path.
@@ -231,7 +231,8 @@ typedef void (*notmuch_compact_status_cb_t)(const char*);
 notmuch_status_t
 notmuch_database_compact (const char* path,
 			  const char* backup_path,
-			  notmuch_compact_status_cb_t status_cb);
+			  notmuch_compact_status_cb_t status_cb,
+			  void *closure);
 
 /* Destroy the notmuch database, closing it if necessary and freeing
  * all associated resources.
diff --git a/notmuch-compact.c b/notmuch-compact.c
index bfda40e..ee7afcf 100644
--- a/notmuch-compact.c
+++ b/notmuch-compact.c
@@ -20,10 +20,8 @@
 
 #include "notmuch-client.h"
 
-void status_update_cb (const char *msg);
-
-void
-status_update_cb (const char *msg)
+static void
+status_update_cb (const char *msg, unused (void *closure))
 {
     printf("%s\n", msg);
 }
@@ -38,7 +36,7 @@ notmuch_compact_command (notmuch_config_t *config,
     notmuch_status_t ret;
 
     printf ("Compacting database...\n");
-    ret = notmuch_database_compact (path, backup_path, status_update_cb);
+    ret = notmuch_database_compact (path, backup_path, status_update_cb, NULL);
     if (ret) {
 	fprintf (stderr, "Compaction failed: %s\n", notmuch_status_to_string(ret));
     } else {
-- 
1.7.2.5