/* * awesome.c - awesome main functions * * Copyright © 2007-2008 Julien Danjou * * 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 "awesome.h" #include "banning.h" #include "common/atoms.h" #include "common/backtrace.h" #include "common/version.h" #include "common/xutil.h" #include "xkb.h" #include "dbus.h" #include "event.h" #include "ewmh.h" #include "globalconf.h" #include "objects/client.h" #include "objects/screen.h" #include "spawn.h" #include "systray.h" #include "xwindow.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include awesome_t globalconf; /** argv used to run awesome */ static char **awesome_argv; /** time of last main loop wakeup */ static struct timeval last_wakeup; /** current limit for the main loop's runtime */ static float main_loop_iteration_limit = 0.1; /** Call before exiting. */ void awesome_atexit(bool restart) { lua_State *L = globalconf_get_lua_State(); lua_pushboolean(L, restart); signal_object_emit(L, &global_signals, "exit", 1); /* Move clients where we want them to be and keep the stacking order intact */ foreach(c, globalconf.stack) { xcb_reparent_window(globalconf.connection, (*c)->window, globalconf.screen->root, (*c)->geometry.x, (*c)->geometry.y); } /* Save the client order. This is useful also for "hard" restarts. */ xcb_window_t *wins = p_alloca(xcb_window_t, globalconf.clients.len); int n = 0; foreach(client, globalconf.clients) wins[n++] = (*client)->window; xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE, globalconf.screen->root, AWESOME_CLIENT_ORDER, XCB_ATOM_WINDOW, 32, n, wins); a_dbus_cleanup(); systray_cleanup(); /* Close Lua */ lua_close(L); /* X11 is a great protocol. There is a save-set so that reparenting WMs * don't kill clients when they shut down. However, when a focused windows * is saved, the focus will move to its parent with revert-to none. * Immediately afterwards, this parent is destroyed and the focus is gone. * Work around this by placing the focus where we like it to be. */ xcb_set_input_focus(globalconf.connection, XCB_INPUT_FOCUS_POINTER_ROOT, XCB_NONE, globalconf.timestamp); xcb_aux_sync(globalconf.connection); xkb_free(); /* Disconnect *after* closing lua */ xcb_cursor_context_free(globalconf.cursor_ctx); xcb_disconnect(globalconf.connection); } /** Restore the client order after a restart */ static void restore_client_order(xcb_get_property_cookie_t prop_cookie) { int client_idx = 0; xcb_window_t *windows; xcb_get_property_reply_t *reply; reply = xcb_get_property_reply(globalconf.connection, prop_cookie, NULL); if (!reply || reply->format != 32 || reply->value_len == 0) { p_delete(&reply); return; } windows = xcb_get_property_value(reply); for (uint32_t i = 0; i < reply->value_len; i++) /* Find windows[i] and swap it to where it belongs */ foreach(c, globalconf.clients) if ((*c)->window == windows[i]) { client_t *tmp = *c; *c = globalconf.clients.tab[client_idx]; globalconf.clients.tab[client_idx] = tmp; client_idx++; } luaA_class_emit_signal(globalconf_get_lua_State(), &client_class, "list", 0); p_delete(&reply); } /** Scan X to find windows to manage. */ static void scan(xcb_query_tree_cookie_t tree_c) { int i, tree_c_len; xcb_query_tree_reply_t *tree_r; xcb_window_t *wins = NULL; xcb_get_window_attributes_reply_t *attr_r; xcb_get_geometry_reply_t *geom_r; xcb_get_property_cookie_t prop_cookie; tree_r = xcb_query_tree_reply(globalconf.connection, tree_c, NULL); if(!tree_r) return; /* This gets the property and deletes it */ prop_cookie = xcb_get_property_unchecked(globalconf.connection, true, globalconf.screen->root, AWESOME_CLIENT_ORDER, XCB_ATOM_WINDOW, 0, UINT_MAX); /* Get the tree of the children windows of the current root window */ if(!(wins = xcb_query_tree_children(tree_r))) fatal("cannot get tree children"); tree_c_len = xcb_query_tree_children_length(tree_r); xcb_get_window_attributes_cookie_t attr_wins[tree_c_len]; xcb_get_property_cookie_t state_wins[tree_c_len]; xcb_get_geometry_cookie_t geom_wins[tree_c_len]; for(i = 0; i < tree_c_len; i++) { attr_wins[i] = xcb_get_window_attributes_unchecked(globalconf.connection, wins[i]); state_wins[i] = xwindow_get_state_unchecked(wins[i]); geom_wins[i] = xcb_get_geometry_unchecked(globalconf.connection, wins[i]); } for(i = 0; i < tree_c_len; i++) { attr_r = xcb_get_window_attributes_reply(globalconf.connection, attr_wins[i], NULL); geom_r = xcb_get_geometry_reply(globalconf.connection, geom_wins[i], NULL); long state = xwindow_get_state_reply(state_wins[i]); if(!geom_r || !attr_r || attr_r->override_redirect || attr_r->map_state == XCB_MAP_STATE_UNMAPPED || state == XCB_ICCCM_WM_STATE_WITHDRAWN) { p_delete(&attr_r); p_delete(&geom_r); continue; } client_manage(wins[i], geom_r, attr_r); p_delete(&attr_r); p_delete(&geom_r); } p_delete(&tree_r); restore_client_order(prop_cookie); } static void acquire_WM_Sn(bool replace) { xcb_intern_atom_cookie_t atom_q; xcb_intern_atom_reply_t *atom_r; char *atom_name; xcb_get_selection_owner_reply_t *get_sel_reply; xcb_client_message_event_t ev; /* Get the WM_Sn atom */ globalconf.selection_owner_window = xcb_generate_id(globalconf.connection); xcb_create_window(globalconf.connection, globalconf.screen->root_depth, globalconf.selection_owner_window, globalconf.screen->root, -1, -1, 1, 1, 0, XCB_COPY_FROM_PARENT, globalconf.screen->root_visual, 0, NULL); xwindow_set_class_instance(globalconf.selection_owner_window); xwindow_set_name_static(globalconf.selection_owner_window, "Awesome WM_Sn selection owner window"); atom_name = xcb_atom_name_by_screen("WM_S", globalconf.default_screen); if(!atom_name) fatal("error getting WM_Sn atom name"); atom_q = xcb_intern_atom_unchecked(globalconf.connection, false, a_strlen(atom_name), atom_name); p_delete(&atom_name); atom_r = xcb_intern_atom_reply(globalconf.connection, atom_q, NULL); if(!atom_r) fatal("error getting WM_Sn atom"); globalconf.selection_atom = atom_r->atom; p_delete(&atom_r); /* Is the selection already owned? */ get_sel_reply = xcb_get_selection_owner_reply(globalconf.connection, xcb_get_selection_owner(globalconf.connection, globalconf.selection_atom), NULL); if (!get_sel_reply) fatal("GetSelectionOwner for WM_Sn failed"); if (!replace && get_sel_reply->owner != XCB_NONE) fatal("another window manager is already running (selection owned; use --replace)"); /* Acquire the selection */ xcb_set_selection_owner(globalconf.connection, globalconf.selection_owner_window, globalconf.selection_atom, globalconf.timestamp); if (get_sel_reply->owner != XCB_NONE) { /* Wait for the old owner to go away */ xcb_get_geometry_reply_t *geom_reply = NULL; do { p_delete(&geom_reply); geom_reply = xcb_get_geometry_reply(globalconf.connection, xcb_get_geometry(globalconf.connection, get_sel_reply->owner), NULL); } while (geom_reply != NULL); } p_delete(&get_sel_reply); /* Announce that we are the new owner */ p_clear(&ev, 1); ev.response_type = XCB_CLIENT_MESSAGE; ev.window = globalconf.screen->root; ev.format = 32; ev.type = MANAGER; ev.data.data32[0] = globalconf.timestamp; ev.data.data32[1] = globalconf.selection_atom; ev.data.data32[2] = globalconf.selection_owner_window; ev.data.data32[3] = ev.data.data32[4] = 0; xcb_send_event(globalconf.connection, false, globalconf.screen->root, 0xFFFFFF, (char *) &ev); } static void acquire_timestamp(void) { /* Getting a current timestamp is hard. ICCCM recommends a zero-length * append to a property, so let's do that. */ xcb_generic_event_t *event; xcb_window_t win = globalconf.screen->root; xcb_atom_t atom = XCB_ATOM_RESOURCE_MANAGER; /* Just something random */ xcb_atom_t type = XCB_ATOM_STRING; /* Equally random */ xcb_grab_server(globalconf.connection); xcb_change_window_attributes(globalconf.connection, win, XCB_CW_EVENT_MASK, (uint32_t[]) { XCB_EVENT_MASK_PROPERTY_CHANGE }); xcb_change_property(globalconf.connection, XCB_PROP_MODE_APPEND, win, atom, type, 8, 0, ""); xcb_change_window_attributes(globalconf.connection, win, XCB_CW_EVENT_MASK, (uint32_t[]) { 0 }); xcb_ungrab_server(globalconf.connection); xcb_flush(globalconf.connection); /* Now wait for the event */ while((event = xcb_wait_for_event(globalconf.connection))) { /* Is it the event we are waiting for? */ if(XCB_EVENT_RESPONSE_TYPE(event) == XCB_PROPERTY_NOTIFY) { xcb_property_notify_event_t *ev = (void *) event; globalconf.timestamp = ev->time; p_delete(&event); break; } /* Hm, not the right event. */ if (globalconf.pending_event != NULL) { event_handle(globalconf.pending_event); p_delete(&globalconf.pending_event); } globalconf.pending_event = event; } } static xcb_generic_event_t *poll_for_event(void) { if (globalconf.pending_event) { xcb_generic_event_t *event = globalconf.pending_event; globalconf.pending_event = NULL; return event; } return xcb_poll_for_event(globalconf.connection); } static void a_xcb_check(void) { xcb_generic_event_t *mouse = NULL, *event; while((event = poll_for_event())) { /* We will treat mouse events later. * We cannot afford to treat all mouse motion events, * because that would be too much CPU intensive, so we just * take the last we get after a bunch of events. */ if(XCB_EVENT_RESPONSE_TYPE(event) == XCB_MOTION_NOTIFY) { p_delete(&mouse); mouse = event; } else { uint8_t type = XCB_EVENT_RESPONSE_TYPE(event); if(mouse && (type == XCB_ENTER_NOTIFY || type == XCB_LEAVE_NOTIFY || type == XCB_BUTTON_PRESS || type == XCB_BUTTON_RELEASE)) { /* Make sure enter/motion/leave/press/release events are handled * in the correct order */ event_handle(mouse); p_delete(&mouse); } event_handle(event); p_delete(&event); } } if(mouse) { event_handle(mouse); p_delete(&mouse); } } static gboolean a_xcb_io_cb(GIOChannel *source, GIOCondition cond, gpointer data) { /* a_xcb_check() already handled all events */ if(xcb_connection_has_error(globalconf.connection)) fatal("X server connection broke (error %d)", xcb_connection_has_error(globalconf.connection)); return TRUE; } static gint a_glib_poll(GPollFD *ufds, guint nfsd, gint timeout) { guint res; struct timeval now, length_time; float length; lua_State *L = globalconf_get_lua_State(); /* Do all deferred work now */ awesome_refresh(); /* Check if the Lua stack is the way it should be */ if (lua_gettop(L) != 0) { warn("Something was left on the Lua stack, this is a bug!"); luaA_dumpstack(L); lua_settop(L, 0); } /* Don't sleep if there is a pending event */ assert(globalconf.pending_event == NULL); globalconf.pending_event = xcb_poll_for_event(globalconf.connection); if (globalconf.pending_event != NULL) timeout = 0; /* Check how long this main loop iteration took */ gettimeofday(&now, NULL); timersub(&now, &last_wakeup, &length_time); length = length_time.tv_sec + length_time.tv_usec * 1.0f / 1e6; if (length > main_loop_iteration_limit) { warn("Last main loop iteration took %.6f seconds! Increasing limit for " "this warning to that value.", length); main_loop_iteration_limit = length; } /* Actually do the polling, record time of wakeup and check for new xcb events */ res = g_poll(ufds, nfsd, timeout); gettimeofday(&last_wakeup, NULL); a_xcb_check(); return res; } static void signal_fatal(int signum) { buffer_t buf; backtrace_get(&buf); fatal("signal %d, dumping backtrace\n%s", signum, buf.s); } /** Function to exit on some signals. * \param data currently unused */ static gboolean exit_on_signal(gpointer data) { g_main_loop_quit(globalconf.loop); return TRUE; } void awesome_restart(void) { awesome_atexit(true); execvp(awesome_argv[0], spawn_transform_commandline(awesome_argv)); fatal("execv() failed: %s", strerror(errno)); } /** Function to restart awesome on some signals. * \param data currently unused */ static gboolean restart_on_signal(gpointer data) { awesome_restart(); return TRUE; } static bool true_config_callback(const char *unused) { return true; } /** Print help and exit(2) with given exit_code. * \param exit_code The exit code. */ static void __attribute__ ((noreturn)) exit_help(int exit_code) { FILE *outfile = (exit_code == EXIT_SUCCESS) ? stdout : stderr; fprintf(outfile, "Usage: awesome [OPTION]\n\ -h, --help show help\n\ -v, --version show version\n\ -c, --config FILE configuration file to use\n\ --search DIR add a directory to the library search path\n\ -k, --check check configuration file syntax\n\ -a, --no-argb disable client transparency support\n\ -r, --replace replace an existing window manager\n"); exit(exit_code); } /** Hello, this is main. * \param argc Who knows. * \param argv Who knows. * \return EXIT_SUCCESS I hope. */ int main(int argc, char **argv) { char *confpath = NULL; string_array_t searchpath; int xfd, opt; xdgHandle xdg; bool no_argb = false; bool run_test = false; bool replace_wm = false; xcb_query_tree_cookie_t tree_c; static struct option long_options[] = { { "help", 0, NULL, 'h' }, { "version", 0, NULL, 'v' }, { "config", 1, NULL, 'c' }, { "check", 0, NULL, 'k' }, { "search", 1, NULL, 's' }, { "no-argb", 0, NULL, 'a' }, { "replace", 0, NULL, 'r' }, { "reap", 1, NULL, '\1' }, { NULL, 0, NULL, 0 } }; /* Make stdout/stderr line buffered. */ setvbuf(stdout, NULL, _IOLBF, 0); setvbuf(stderr, NULL, _IOLBF, 0); /* clear the globalconf structure */ p_clear(&globalconf, 1); globalconf.keygrabber = LUA_REFNIL; globalconf.mousegrabber = LUA_REFNIL; globalconf.exit_code = EXIT_SUCCESS; buffer_init(&globalconf.startup_errors); string_array_init(&searchpath); /* save argv */ awesome_argv = argv; /* Text won't be printed correctly otherwise */ setlocale(LC_CTYPE, ""); /* check args */ while((opt = getopt_long(argc, argv, "vhkc:ar", long_options, NULL)) != -1) switch(opt) { case 'v': eprint_version(); break; case 'h': exit_help(EXIT_SUCCESS); break; case 'k': run_test = true; break; case 'c': if (confpath != NULL) fatal("--config may only be specified once"); confpath = a_strdup(optarg); break; case 's': string_array_append(&searchpath, a_strdup(optarg)); break; case 'a': no_argb = true; break; case 'r': replace_wm = true; break; case '\1': spawn_handle_reap(optarg); break; default: exit_help(EXIT_FAILURE); break; } /* Get XDG basedir data */ xdgInitHandle(&xdg); /* add XDG_CONFIG_DIR as include path */ const char * const *xdgconfigdirs = xdgSearchableConfigDirectories(&xdg); for(; *xdgconfigdirs; xdgconfigdirs++) { /* Append /awesome to *xdgconfigdirs */ const char *suffix = "/awesome"; size_t len = a_strlen(*xdgconfigdirs) + a_strlen(suffix) + 1; char *entry = p_new(char, len); a_strcat(entry, len, *xdgconfigdirs); a_strcat(entry, len, suffix); string_array_append(&searchpath, entry); } if (run_test) { bool success = true; /* Get the first config that will be tried */ const char *config = luaA_find_config(&xdg, confpath, true_config_callback); /* Try to parse it */ lua_State *L = luaL_newstate(); if(luaL_loadfile(L, config)) { const char *err = lua_tostring(L, -1); fprintf(stderr, "%s\n", err); success = false; } p_delete(&config); lua_close(L); if(!success) { fprintf(stderr, "✘ Configuration file syntax error.\n"); return EXIT_FAILURE; } else { fprintf(stderr, "✔ Configuration file syntax OK.\n"); return EXIT_SUCCESS; } } /* register function for signals */ g_unix_signal_add(SIGINT, exit_on_signal, NULL); g_unix_signal_add(SIGTERM, exit_on_signal, NULL); g_unix_signal_add(SIGHUP, restart_on_signal, NULL); struct sigaction sa = { .sa_handler = signal_fatal, .sa_flags = SA_RESETHAND }; sigemptyset(&sa.sa_mask); sigaction(SIGABRT, &sa, 0); sigaction(SIGBUS, &sa, 0); sigaction(SIGFPE, &sa, 0); sigaction(SIGILL, &sa, 0); sigaction(SIGSEGV, &sa, 0); signal(SIGPIPE, SIG_IGN); /* We have no clue where the input focus is right now */ globalconf.focus.need_update = true; /* set the default preferred icon size */ globalconf.preferred_icon_size = 0; /* X stuff */ globalconf.connection = xcb_connect(NULL, &globalconf.default_screen); if(xcb_connection_has_error(globalconf.connection)) fatal("cannot open display (error %d)", xcb_connection_has_error(globalconf.connection)); globalconf.screen = xcb_aux_get_screen(globalconf.connection, globalconf.default_screen); globalconf.default_visual = draw_default_visual(globalconf.screen); if(!no_argb) globalconf.visual = draw_argb_visual(globalconf.screen); if(!globalconf.visual) globalconf.visual = globalconf.default_visual; globalconf.default_depth = draw_visual_depth(globalconf.screen, globalconf.visual->visual_id); globalconf.default_cmap = globalconf.screen->default_colormap; if(globalconf.default_depth != globalconf.screen->root_depth) { // We need our own color map if we aren't using the default depth globalconf.default_cmap = xcb_generate_id(globalconf.connection); xcb_create_colormap(globalconf.connection, XCB_COLORMAP_ALLOC_NONE, globalconf.default_cmap, globalconf.screen->root, globalconf.visual->visual_id); } /* Get a recent timestamp */ acquire_timestamp(); /* Prefetch all the extensions we might need */ xcb_prefetch_extension_data(globalconf.connection, &xcb_big_requests_id); xcb_prefetch_extension_data(globalconf.connection, &xcb_test_id); xcb_prefetch_extension_data(globalconf.connection, &xcb_randr_id); xcb_prefetch_extension_data(globalconf.connection, &xcb_xinerama_id); xcb_prefetch_extension_data(globalconf.connection, &xcb_shape_id); if (xcb_cursor_context_new(globalconf.connection, globalconf.screen, &globalconf.cursor_ctx) < 0) fatal("Failed to initialize xcb-cursor"); globalconf.xrmdb = xcb_xrm_database_from_default(globalconf.connection); if (globalconf.xrmdb == NULL) globalconf.xrmdb = xcb_xrm_database_from_string(""); if (globalconf.xrmdb == NULL) fatal("Failed to initialize xcb-xrm"); /* Did we get some usable data from the above X11 setup? */ draw_test_cairo_xcb(); /* Acquire the WM_Sn selection */ acquire_WM_Sn(replace_wm); /* initialize dbus */ a_dbus_init(); /* Get the file descriptor corresponding to the X connection */ xfd = xcb_get_file_descriptor(globalconf.connection); GIOChannel *channel = g_io_channel_unix_new(xfd); g_io_add_watch(channel, G_IO_IN, a_xcb_io_cb, NULL); g_io_channel_unref(channel); /* Grab server */ xcb_grab_server(globalconf.connection); { const uint32_t select_input_val = XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT; xcb_void_cookie_t cookie; /* This causes an error if some other window manager is running */ cookie = xcb_change_window_attributes_checked(globalconf.connection, globalconf.screen->root, XCB_CW_EVENT_MASK, &select_input_val); if (xcb_request_check(globalconf.connection, cookie)) fatal("another window manager is already running (can't select SubstructureRedirect)"); } /* Prefetch the maximum request length */ xcb_prefetch_maximum_request_length(globalconf.connection); /* check for xtest extension */ const xcb_query_extension_reply_t *query; query = xcb_get_extension_data(globalconf.connection, &xcb_test_id); globalconf.have_xtest = query && query->present; /* check for shape extension */ query = xcb_get_extension_data(globalconf.connection, &xcb_shape_id); globalconf.have_shape = query && query->present; if (globalconf.have_shape) { xcb_shape_query_version_reply_t *reply = xcb_shape_query_version_reply(globalconf.connection, xcb_shape_query_version_unchecked(globalconf.connection), NULL); globalconf.have_input_shape = reply && (reply->major_version > 1 || (reply->major_version == 1 && reply->minor_version >= 1)); p_delete(&reply); } event_init(); /* Allocate the key symbols */ globalconf.keysyms = xcb_key_symbols_alloc(globalconf.connection); /* init atom cache */ atoms_init(globalconf.connection); ewmh_init(); systray_init(); /* init spawn (sn) */ spawn_init(); /* init xkb */ xkb_init(); /* The default GC is just a newly created associated with a window with * depth globalconf.default_depth. * The window_no_focus is used for "nothing has the input focus". */ globalconf.focus.window_no_focus = xcb_generate_id(globalconf.connection); globalconf.gc = xcb_generate_id(globalconf.connection); xcb_create_window(globalconf.connection, globalconf.default_depth, globalconf.focus.window_no_focus, globalconf.screen->root, -1, -1, 1, 1, 0, XCB_COPY_FROM_PARENT, globalconf.visual->visual_id, XCB_CW_BACK_PIXEL | XCB_CW_BORDER_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_COLORMAP, (const uint32_t []) { globalconf.screen->black_pixel, globalconf.screen->black_pixel, 1, globalconf.default_cmap }); xwindow_set_class_instance(globalconf.focus.window_no_focus); xwindow_set_name_static(globalconf.focus.window_no_focus, "Awesome no input window"); xcb_map_window(globalconf.connection, globalconf.focus.window_no_focus); xcb_create_gc(globalconf.connection, globalconf.gc, globalconf.focus.window_no_focus, XCB_GC_FOREGROUND | XCB_GC_BACKGROUND, (const uint32_t[]) { globalconf.screen->black_pixel, globalconf.screen->white_pixel }); /* Get the window tree associated to this screen */ tree_c = xcb_query_tree_unchecked(globalconf.connection, globalconf.screen->root); xcb_change_window_attributes(globalconf.connection, globalconf.screen->root, XCB_CW_EVENT_MASK, ROOT_WINDOW_EVENT_MASK); /* we will receive events, stop grabbing server */ xcb_ungrab_server(globalconf.connection); xcb_flush(globalconf.connection); /* get the current wallpaper, from now on we are informed when it changes */ root_update_wallpaper(); /* init lua */ luaA_init(&xdg, &searchpath); string_array_wipe(&searchpath); ewmh_init_lua(); /* init screens information */ screen_scan(); /* Parse and run configuration file */ if (!luaA_parserc(&xdg, confpath)) fatal("couldn't find any rc file"); p_delete(&confpath); xdgWipeHandle(&xdg); /* scan existing windows */ scan(tree_c); luaA_emit_startup(); /* Setup the main context */ g_main_context_set_poll_func(g_main_context_default(), &a_glib_poll); gettimeofday(&last_wakeup, NULL); /* main event loop (if not NULL, awesome.quit() was already called) */ if (globalconf.loop == NULL) { globalconf.loop = g_main_loop_new(NULL, FALSE); g_main_loop_run(globalconf.loop); } g_main_loop_unref(globalconf.loop); globalconf.loop = NULL; awesome_atexit(false); return globalconf.exit_code; } // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80