degesch: add a read-only /set command

1 files changed, 176 insertions, 0 deletions

diff --git a/degesch.c b/degesch.c
index 55fb325..b0a3e04 100644
--- a/degesch.c
+++ b/degesch.c
@@ -3547,6 +3547,106 @@ log_outcoming_notice (struct server *s,
 	send_autosplit_message ((s), (struct send_autosplit_args)                  \
 		{ "NOTICE", (target), (message), log_outcoming_notice, "", "" })
 
+// --- Configuration dumper ----------------------------------------------------
+
+struct config_dump_level
+{
+	struct config_dump_level *next;     ///< Next print level
+	const char *name;                   ///< Name of the object
+};
+
+struct config_dump_data
+{
+	struct config_dump_level *head;     ///< The first level
+	struct config_dump_level **tail;    ///< Where to place further levels
+	struct str_vector *output;          ///< Where to place new entries
+};
+
+static void config_dump_item
+	(struct config_item_ *item, struct config_dump_data *data);
+
+static void
+config_dump_children
+	(struct config_item_ *object, struct config_dump_data *data)
+{
+	hard_assert (object->type = CONFIG_ITEM_OBJECT);
+
+	struct config_dump_level level;
+	level.next = NULL;
+
+	struct config_dump_level **prev_tail = data->tail;
+	*data->tail = &level;
+	data->tail = &level.next;
+
+	struct str_map_iter iter;
+	str_map_iter_init (&iter, &object->value.object);
+	struct config_item_ *child;
+	while ((child = str_map_iter_next (&iter)))
+	{
+		level.name = iter.link->key;
+		config_dump_item (child, data);
+	}
+
+	data->tail = prev_tail;
+	*data->tail = NULL;
+}
+
+static void
+config_dump_item (struct config_item_ *item, struct config_dump_data *data)
+{
+	struct str line;
+	str_init (&line);
+
+	struct config_dump_level *iter = data->head;
+	if (iter)
+	{
+		str_append (&line, iter->name);
+		iter = iter->next;
+	}
+	for (; iter; iter = iter->next)
+		str_append_printf (&line, ".%s", iter->name);
+
+	// Empty objects will show as such
+	if (item->type == CONFIG_ITEM_OBJECT
+	 && item->value.object.len)
+	{
+		config_dump_children (item, data);
+		return;
+	}
+
+	// Don't bother writing out null values everywhere
+	struct config_schema *schema = item->schema;
+	bool has_default = schema && schema->default_;
+	if (item->type != CONFIG_ITEM_NULL || has_default)
+	{
+		str_append (&line, " = ");
+
+		struct str value;
+		str_init (&value);
+		config_item_write (item, false, &value);
+		str_append_str (&line, &value);
+
+		if (has_default && strcmp (schema->default_, value.str))
+			str_append_printf (&line, " (default: %s)", schema->default_);
+		else if (!has_default && item->type != CONFIG_ITEM_NULL)
+			str_append_printf (&line, " (default: %s)", "null");
+		str_free (&value);
+	}
+
+	str_vector_add_owned (data->output, str_steal (&line));
+}
+
+static void
+config_dump (struct config_item_ *root, struct str_vector *output)
+{
+	struct config_dump_data data;
+	data.head = NULL;
+	data.tail = &data.head;
+	data.output = output;
+
+	config_dump_item (root, &data);
+}
+
 // --- User input handling -----------------------------------------------------
 
 static bool handle_command_help (struct app_context *, char *);
@@ -3673,6 +3773,80 @@ handle_command_buffer (struct app_context *ctx, char *arguments)
 	return true;
 }
 
+static int
+str_vector_sort_cb (const void *a, const void *b)
+{
+	return strcmp (*(const char **) a, *(const char **) b);
+}
+
+static void
+str_vector_sort (struct str_vector *self)
+{
+	qsort (self->vector, self->len, sizeof *self->vector, str_vector_sort_cb);
+}
+
+static bool
+handle_command_set (struct app_context *ctx, char *arguments)
+{
+	struct str_vector all;
+	str_vector_init (&all);
+	config_dump (ctx->config.root, &all);
+	str_vector_sort (&all);
+
+	char *option = "*";
+	if (*arguments)
+		option = cut_word (&arguments);
+
+	// Filter out results by wildcard matching
+	for (size_t i = 0; i < all.len; i++)
+	{
+		char *key = xstrdup (all.vector[i]);
+		char *end = strchr (key, ' ');
+		if (end)
+			*end = '\0';
+		if (fnmatch (option, key, 0))
+			str_vector_remove (&all, i--);
+		free (key);
+	}
+
+	if (!*arguments)
+	{
+		buffer_send_status (ctx, ctx->global_buffer, "%s", "");
+		for (size_t i = 0; i < all.len; i++)
+			buffer_send_status (ctx, ctx->global_buffer, "%s", all.vector[i]);
+		str_vector_free (&all);
+		return true;
+	}
+
+	char *op = cut_word (&arguments);
+	bool add = false;
+	bool remove = false;
+
+	if      (!strcmp (op, "+="))  add = true;
+	else if (!strcmp (op, "-="))  remove = true;
+	else if  (strcmp (op, "="))   return false;
+
+	if (!arguments)
+		return false;
+
+	char *value = cut_word (&arguments);
+	struct error *e = NULL;
+	struct config_item_ *new_ =
+		config_item_parse (value, strlen (value), true, &e);
+	if (e)
+	{
+		buffer_send_error (ctx, ctx->global_buffer,
+			"Invalid value: %s", e->message);
+		error_free (e);
+		return true;
+	}
+
+	// TODO: try to set the value, or modify the string list
+	buffer_send_error (ctx, ctx->global_buffer, "Not implemented");
+	config_item_destroy (new_);
+	return true;
+}
+
 static bool
 handle_command_msg (struct app_context *ctx, char *arguments)
 {
@@ -3901,6 +4075,8 @@ g_command_handlers[] =
 	  "[<message>]" },
 	{ "buffer",  handle_command_buffer, "Manage buffers",
 	  "list | clear | move | { close [<number> | <name>] } | <number>" },
+	{ "set",     handle_command_set,    "Manage configuration",
+	  "[<option>]" },
 
 	{ "msg",     handle_command_msg,    "Send message to a nick or channel",
 	  "<target> <message>" },