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awesome/objects/selection_getter.c

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/*
* selection_getter.c - selection content getter
*
* Copyright © 2019 Uli Schlachter <psychon@znc.in>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include "objects/selection_getter.h"
#include "common/luaobject.h"
#include "common/atoms.h"
#include "globalconf.h"
#define REGISTRY_GETTER_TABLE_INDEX "awesome_selection_getters"
typedef struct selection_getter_t
{
LUA_OBJECT_HEADER
/** Reference in the special table to this object */
int ref;
/** Window used for the transfer */
xcb_window_t window;
} selection_getter_t;
static lua_class_t selection_getter_class;
LUA_OBJECT_FUNCS(selection_getter_class, selection_getter_t, selection_getter)
static void
selection_getter_wipe(selection_getter_t *selection)
{
xcb_destroy_window(globalconf.connection, selection->window);
}
static int
luaA_selection_getter_new(lua_State *L)
{
size_t name_length, target_length;
const char *name, *target;
xcb_intern_atom_cookie_t cookies[2];
xcb_intern_atom_reply_t *reply;
selection_getter_t *selection;
xcb_atom_t name_atom, target_atom;
name = luaL_checklstring(L, 2, &name_length);
target = luaL_checklstring(L, 3, &target_length);
/* Create a selection object */
selection = (void *) selection_getter_class.allocator(L);
selection->window = xcb_generate_id(globalconf.connection);
xcb_create_window(globalconf.connection, globalconf.screen->root_depth,
selection->window, globalconf.screen->root, -1, -1, 1, 1, 0,
XCB_COPY_FROM_PARENT, globalconf.screen->root_visual, 0, NULL);
/* Save it in the registry */
lua_pushliteral(L, REGISTRY_GETTER_TABLE_INDEX);
lua_rawget(L, LUA_REGISTRYINDEX);
lua_pushvalue(L, -2);
selection->ref = luaL_ref(L, -2);
lua_pop(L, 1);
/* Get the atoms identifying the request */
cookies[0] = xcb_intern_atom_unchecked(globalconf.connection, false, name_length, name);
cookies[1] = xcb_intern_atom_unchecked(globalconf.connection, false, target_length, target);
reply = xcb_intern_atom_reply(globalconf.connection, cookies[0], NULL);
name_atom = reply ? reply->atom : XCB_NONE;
p_delete(&reply);
reply = xcb_intern_atom_reply(globalconf.connection, cookies[1], NULL);
target_atom = reply ? reply->atom : XCB_NONE;
p_delete(&reply);
xcb_convert_selection(globalconf.connection, selection->window, name_atom,
target_atom, AWESOME_SELECTION_ATOM, globalconf.timestamp);
return 1;
}
static void
selection_transfer_finished(lua_State *L, int ud)
{
selection_getter_t *selection = lua_touserdata(L, ud);
/* Unreference the selection object; it's dead */
lua_pushliteral(L, REGISTRY_GETTER_TABLE_INDEX);
lua_rawget(L, LUA_REGISTRYINDEX);
luaL_unref(L, -1, selection->ref);
lua_pop(L, 1);
selection->ref = LUA_NOREF;
luaA_object_emit_signal(L, ud, "data_end", 0);
}
static void
selection_push_data(lua_State *L, xcb_get_property_reply_t *property)
{
if (property->type == XCB_ATOM_ATOM && property->format == 32) {
size_t num_atoms = xcb_get_property_value_length(property) / 4;
xcb_atom_t *atoms = xcb_get_property_value(property);
xcb_get_atom_name_cookie_t cookies[num_atoms];
for (size_t i = 0; i < num_atoms; i++)
cookies[i] = xcb_get_atom_name_unchecked(globalconf.connection, atoms[i]);
lua_newtable(L);
for (size_t i = 0; i < num_atoms; i++) {
xcb_get_atom_name_reply_t *reply = xcb_get_atom_name_reply(
globalconf.connection, cookies[i], NULL);
if (reply)
{
lua_pushlstring(L, xcb_get_atom_name_name(reply), xcb_get_atom_name_name_length(reply));
lua_rawseti(L, -2, i+1);
}
p_delete(&reply);
}
} else {
lua_pushlstring(L, xcb_get_property_value(property), xcb_get_property_value_length(property));
}
}
static void
selection_handle_selectionnotify(lua_State *L, int ud, xcb_atom_t property)
{
selection_getter_t *selection;
ud = luaA_absindex(L, ud);
selection = lua_touserdata(L, ud);
if (property != XCB_NONE)
{
xcb_change_window_attributes(globalconf.connection, selection->window,
XCB_CW_EVENT_MASK, (uint32_t[]) { XCB_EVENT_MASK_PROPERTY_CHANGE });
xcb_get_property_reply_t *property_r = xcb_get_property_reply(globalconf.connection,
xcb_get_property(globalconf.connection, true, selection->window, AWESOME_SELECTION_ATOM,
XCB_GET_PROPERTY_TYPE_ANY, 0, 0xffffffff), NULL);
if (property_r)
{
if (property_r->type == INCR)
{
/* This is an incremental transfer. The above GetProperty had
* delete=true. This indicates to the other end that the
* transfer should start now. Right now we only get an estimate
* of the size of the data to be transferred, which we ignore.
*/
p_delete(&property_r);
return;
}
selection_push_data(L, property_r);
luaA_object_emit_signal(L, ud, "data", 1);
p_delete(&property_r);
}
}
selection_transfer_finished(L, ud);
}
static int
selection_getter_find_by_window(lua_State *L, xcb_window_t window)
{
/* Iterate over all active selection getters */
lua_pushliteral(L, REGISTRY_GETTER_TABLE_INDEX);
lua_rawget(L, LUA_REGISTRYINDEX);
lua_pushnil(L);
while (lua_next(L, -2) != 0) {
if (lua_type(L, -1) == LUA_TUSERDATA) {
selection_getter_t *selection = lua_touserdata(L, -1);
if (selection->window == window) {
/* Found the right selection, remove table and key */
lua_remove(L, -2);
lua_remove(L, -2);
return 1;
}
}
/* Remove the value, leaving only the key */
lua_pop(L, 1);
}
/* Remove the getter table */
lua_pop(L, 1);
return 0;
}
int
property_handle_awesome_selection_atom(uint8_t state, xcb_window_t window)
{
lua_State *L = globalconf_get_lua_State();
if (state != XCB_PROPERTY_NEW_VALUE)
return 0;
if (selection_getter_find_by_window(L, window) == 0)
return 0;
selection_getter_t *selection = lua_touserdata(L, -1);
xcb_get_property_reply_t *property_r = xcb_get_property_reply(globalconf.connection,
xcb_get_property(globalconf.connection, true, selection->window, AWESOME_SELECTION_ATOM,
XCB_GET_PROPERTY_TYPE_ANY, 0, 0xffffffff), NULL);
if (property_r)
{
if (property_r->value_len > 0)
{
selection_push_data(L, property_r);
luaA_object_emit_signal(L, -2, "data", 1);
}
else
{
/* Transfer finished */
selection_transfer_finished(L, -1);
}
p_delete(&property_r);
}
lua_pop(L, 1);
return 0;
}
void
event_handle_selectionnotify(xcb_selection_notify_event_t *ev)
{
lua_State *L = globalconf_get_lua_State();
if (selection_getter_find_by_window(L, ev->requestor) == 0)
return;
selection_handle_selectionnotify(L, -1, ev->property);
lua_pop(L, 1);
}
void
selection_getter_class_setup(lua_State *L)
{
static const struct luaL_Reg selection_getter_methods[] =
{
{ "__call", luaA_selection_getter_new },
{ NULL, NULL }
};
static const struct luaL_Reg selection_getter_metha[] = {
LUA_OBJECT_META(selection_getter)
LUA_CLASS_META
{ NULL, NULL }
};
/* Store a table in the registry that tracks active getters. This code does
* debug.getregistry(){REGISTRY_GETTER_TABLE_INDEX] = {}
*/
lua_pushliteral(L, REGISTRY_GETTER_TABLE_INDEX);
lua_newtable(L);
lua_rawset(L, LUA_REGISTRYINDEX);
luaA_class_setup(L, &selection_getter_class, "selection_getter", NULL,
(lua_class_allocator_t) selection_getter_new,
(lua_class_collector_t) selection_getter_wipe, NULL,
luaA_class_index_miss_property, luaA_class_newindex_miss_property,
selection_getter_methods, selection_getter_metha);
}
// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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