cli: add support for --output parameter in notmuch count

Add support for --output=messages (which remains the default) and
--output=threads to notmuch count.

Signed-off-by: Jani Nikula <jani@nikula.org>

NEWS

@@ -28,6 +28,11 @@ Add "notmuch search" --offset and --limit options
   The search command now takes options --offset=[-]N and --limit=N to limit
   the number of results shown.
 
+Add "notmuch count --output" option
+
+  The count command is now capable of counting threads in addition to
+  messages. This is selected using the new --output=(threads|messages) option.
+
 Optimizations
 -------------
 

notmuch-count.c

@@ -29,6 +29,7 @@ notmuch_count_command (void *ctx, int argc, char *argv[])
     notmuch_query_t *query;
     char *query_str;
     int i;
+    notmuch_bool_t output_messages = TRUE;
 
     argc--; argv++; /* skip subcommand argument */
 
@@ -37,7 +38,17 @@ notmuch_count_command (void *ctx, int argc, char *argv[])
 	    i++;
 	    break;
 	}
-	{
+	if (STRNCMP_LITERAL (argv[i], "--output=") == 0) {
+	    const char *opt = argv[i] + sizeof ("--output=") - 1;
+	    if (strcmp (opt, "threads") == 0) {
+		output_messages = FALSE;
+	    } else if (strcmp (opt, "messages") == 0) {
+		output_messages = TRUE;
+	    } else {
+		fprintf (stderr, "Invalid value for --output: %s\n", opt);
+		return 1;
+	    }
+	} else {
 	    fprintf (stderr, "Unrecognized option: %s\n", argv[i]);
 	    return 1;
 	}
@@ -71,7 +82,10 @@ notmuch_count_command (void *ctx, int argc, char *argv[])
 	return 1;
     }
 
-    printf ("%u\n", notmuch_query_count_messages(query));
+    if (output_messages)
+	printf ("%u\n", notmuch_query_count_messages (query));
+    else
+	printf ("%u\n", notmuch_query_count_threads (query));
 
     notmuch_query_destroy (query);
     notmuch_database_close (notmuch);

notmuch.1

@@ -372,14 +372,35 @@ section below for details of the supported syntax for <search-terms>.
 .RE
 .RS 4
 .TP 4
-.BR count " <search-term>..."
+.BR count " [options...] <search-term>..."
 
 Count messages matching the search terms.
 
-The number of matching messages is output to stdout.
+The number of matching messages (or threads) is output to stdout.
 
-With no search terms, a count of all messages in the database will be
-displayed.
+With no search terms, a count of all messages (or threads) in the database will
+be displayed.
+
+Supported options for
+.B count
+include
+.RS 4
+.TP 4
+.B \-\-output=(messages|threads)
+
+.RS 4
+.TP 4
+.B messages
+
+Output the number of matching messages. This is the default.
+.RE
+.RS 4
+.TP 4
+.B threads
+
+Output the number of matching threads.
+.RE
+.RE
 .RE
 .RE
 

notmuch.c

@@ -328,12 +328,24 @@ static command_t commands[] = {
       "\tSee \"notmuch help search-terms\" for details of the search\n"
       "\tterms syntax." },
     { "count", notmuch_count_command,
-      "<search-terms> [...]",
+      "[options...] <search-terms> [...]",
       "Count messages matching the search terms.",
-      "\tThe number of matching messages is output to stdout.\n"
+      "\tThe number of matching messages (or threads) is output to stdout.\n"
       "\n"
-      "\tWith no search terms, a count of all messages in the database\n"
-      "\twill be displayed.\n"
+      "\tWith no search terms, a count of all messages (or threads) in\n"
+      "\tthe database will be displayed.\n"
+      "\n"
+      "\tSupported options for count include:\n"
+      "\n"
+      "\t--output=(messages|threads)\n"
+      "\n"
+      "\t\tmessages (default)\n"
+      "\n"
+      "\t\tOutput the number of matching messages.\n"
+      "\n"
+      "\t\tthreads\n"
+      "\n"
+      "\t\tOutput the number of matching threads.\n"
       "\n"
       "\tSee \"notmuch help search-terms\" for details of the search\n"
       "\tterms syntax." },