2 * vim:ts=4:sw=4:expandtab
4 * i3 - an improved dynamic tiling window manager
5 * © 2009-2013 Michael Stapelberg and contributors (see also: LICENSE)
7 * i3-nagbar is a utility which displays a nag message, for example in the case
8 * when the user has an error in his configuration file.
12 #include <sys/types.h>
27 #include <xcb/xcb_aux.h>
28 #include <xcb/xcb_event.h>
31 #include "i3-nagbar.h"
33 static char *argv0 = NULL;
42 static xcb_window_t win;
43 static xcb_pixmap_t pixmap;
44 static xcb_gcontext_t pixmap_gc;
45 static xcb_rectangle_t rect = { 0, 0, 600, 20 };
47 static i3String *prompt;
48 static button_t *buttons;
51 /* Result of get_colorpixel() for the various colors. */
52 static uint32_t color_background; /* background of the bar */
53 static uint32_t color_button_background; /* background for buttons */
54 static uint32_t color_border; /* color of the button border */
55 static uint32_t color_border_bottom; /* color of the bottom border */
56 static uint32_t color_text; /* color of the text */
59 xcb_connection_t *conn;
60 xcb_screen_t *root_screen;
63 * Having verboselog() and errorlog() is necessary when using libi3.
66 void verboselog(char *fmt, ...) {
70 vfprintf(stdout, fmt, args);
74 void errorlog(char *fmt, ...) {
78 vfprintf(stderr, fmt, args);
83 * Starts the given application by passing it through a shell. We use double fork
84 * to avoid zombie processes. As the started application’s parent exits (immediately),
85 * the application is reparented to init (process-id 1), which correctly handles
86 * childs, so we don’t have to do it :-).
88 * The shell is determined by looking for the SHELL environment variable. If it
89 * does not exist, /bin/sh is used.
92 static void start_application(const char *command) {
93 printf("executing: %s\n", command);
98 /* Stores the path of the shell */
99 static const char *shell = NULL;
102 if ((shell = getenv("SHELL")) == NULL)
105 /* This is the child */
106 execl(shell, shell, "-c", command, (void*)NULL);
114 static button_t *get_button_at(int16_t x, int16_t y) {
115 for (int c = 0; c < buttoncnt; c++)
116 if (x >= (buttons[c].x) && x <= (buttons[c].x + buttons[c].width))
122 static void handle_button_press(xcb_connection_t *conn, xcb_button_press_event_t *event) {
123 printf("button pressed on x = %d, y = %d\n",
124 event->event_x, event->event_y);
125 /* TODO: set a flag for the button, re-render */
129 * Called when the user releases the mouse button. Checks whether the
130 * coordinates are over a button and executes the appropriate action.
133 static void handle_button_release(xcb_connection_t *conn, xcb_button_release_event_t *event) {
134 printf("button released on x = %d, y = %d\n",
135 event->event_x, event->event_y);
136 /* If the user hits the close button, we exit(0) */
137 if (event->event_x >= (rect.width - 32))
139 button_t *button = get_button_at(event->event_x, event->event_y);
143 /* We need to create a custom script containing our actual command
144 * since not every terminal emulator which is contained in
145 * i3-sensible-terminal supports -e with multiple arguments (and not
146 * all of them support -e with one quoted argument either).
148 * NB: The paths need to be unique, that is, don’t assume users close
149 * their nagbars at any point in time (and they still need to work).
151 char *script_path = get_process_filename("nagbar-cmd");
153 int fd = open(script_path, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
155 warn("Could not create temporary script to store the nagbar command");
158 FILE *script = fdopen(fd, "w");
159 if (script == NULL) {
160 warn("Could not fdopen() temporary script to store the nagbar command");
163 fprintf(script, "#!/bin/sh\nrm %s\n%s", script_path, button->action);
168 sasprintf(&link_path, "%s.nagbar_cmd", script_path);
169 symlink(get_exe_path(argv0), link_path);
172 sasprintf(&terminal_cmd, "i3-sensible-terminal -e %s", link_path);
173 printf("argv0 = %s\n", argv0);
174 printf("terminal_cmd = %s\n", terminal_cmd);
176 start_application(terminal_cmd);
182 /* TODO: unset flag, re-render */
186 * Handles expose events (redraws of the window) and rendering in general. Will
187 * be called from the code with event == NULL or from X with event != NULL.
190 static int handle_expose(xcb_connection_t *conn, xcb_expose_event_t *event) {
191 /* re-draw the background */
192 xcb_change_gc(conn, pixmap_gc, XCB_GC_FOREGROUND, (uint32_t[]){ color_background });
193 xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &rect);
195 /* restore font color */
196 set_font_colors(pixmap_gc, color_text, color_background);
197 draw_text(prompt, pixmap, pixmap_gc,
198 4 + 4, 4 + 4, rect.width - 4 - 4);
200 /* render close button */
201 const char *close_button_label = "X";
203 /* set width to the width of the label */
204 int w = predict_text_width(i3string_from_utf8(close_button_label));
205 /* account for left/right padding, which seems to be set to 8px (total) below */
209 values[0] = color_button_background;
210 values[1] = line_width;
211 xcb_change_gc(conn, pixmap_gc, XCB_GC_FOREGROUND | XCB_GC_LINE_WIDTH, values);
213 xcb_rectangle_t close = { y - w - (2 * line_width), 0, w + (2 * line_width), rect.height };
214 xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &close);
216 xcb_change_gc(conn, pixmap_gc, XCB_GC_FOREGROUND, (uint32_t[]){ color_border });
217 xcb_point_t points[] = {
218 { y - w - (2 * line_width), line_width / 2 },
219 { y - (line_width / 2), line_width / 2 },
220 { y - (line_width / 2), (rect.height - (line_width / 2)) - 2 },
221 { y - w - (2 * line_width), (rect.height - (line_width / 2)) - 2 },
222 { y - w - (2 * line_width), line_width / 2 }
224 xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, pixmap, pixmap_gc, 5, points);
227 set_font_colors(pixmap_gc, color_text, color_button_background);
228 /* the x term here seems to set left/right padding */
229 draw_text_ascii(close_button_label, pixmap, pixmap_gc, y - w - line_width + w / 2 - 4,
230 4 + 4 - 1, rect.width - y + w + line_width - w / 2 + 4);
235 /* render custom buttons */
237 for (int c = 0; c < buttoncnt; c++) {
238 /* set w to the width of the label */
239 w = predict_text_width(buttons[c].label);
240 /* account for left/right padding, which seems to be set to 12px (total) below */
243 xcb_change_gc(conn, pixmap_gc, XCB_GC_FOREGROUND, (uint32_t[]){ color_button_background });
244 close = (xcb_rectangle_t){ y - w - (2 * line_width), 2, w + (2 * line_width), rect.height - 6 };
245 xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &close);
247 xcb_change_gc(conn, pixmap_gc, XCB_GC_FOREGROUND, (uint32_t[]){ color_border });
248 buttons[c].x = y - w - (2 * line_width);
249 buttons[c].width = w;
250 xcb_point_t points2[] = {
251 { y - w - (2 * line_width), (line_width / 2) + 2 },
252 { y - (line_width / 2), (line_width / 2) + 2 },
253 { y - (line_width / 2), (rect.height - 4 - (line_width / 2)) },
254 { y - w - (2 * line_width), (rect.height - 4 - (line_width / 2)) },
255 { y - w - (2 * line_width), (line_width / 2) + 2 }
257 xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, pixmap, pixmap_gc, 5, points2);
259 values[0] = color_text;
260 values[1] = color_button_background;
261 set_font_colors(pixmap_gc, color_text, color_button_background);
262 /* the x term seems to set left/right padding */
263 draw_text(buttons[c].label, pixmap, pixmap_gc,
264 y - w - line_width + 6, 4 + 3, rect.width - y + w + line_width - 6);
269 /* border line at the bottom */
271 values[0] = color_border_bottom;
272 values[1] = line_width;
273 xcb_change_gc(conn, pixmap_gc, XCB_GC_FOREGROUND | XCB_GC_LINE_WIDTH, values);
274 xcb_point_t bottom[] = {
275 { 0, rect.height - 0 },
276 { rect.width, rect.height - 0 }
278 xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, pixmap, pixmap_gc, 2, bottom);
281 /* Copy the contents of the pixmap to the real window */
282 xcb_copy_area(conn, pixmap, win, pixmap_gc, 0, 0, 0, 0, rect.width, rect.height);
288 int main(int argc, char *argv[]) {
289 /* The following lines are a terribly horrible kludge. Because terminal
290 * emulators have different ways of interpreting the -e command line
291 * argument (some need -e "less /etc/fstab", others need -e less
292 * /etc/fstab), we need to write commands to a script and then just run
293 * that script. However, since on some machines, $XDG_RUNTIME_DIR and
294 * $TMPDIR are mounted with noexec, we cannot directly execute the script
297 * Initially, we tried to pass the command via the environment variable
298 * _I3_NAGBAR_CMD. But turns out that some terminal emulators such as
299 * xfce4-terminal run all windows from a single master process and only
300 * pass on the command (not the environment) to that master process.
302 * Therefore, we symlink i3-nagbar (which MUST reside on an executable
303 * filesystem) with a special name and run that symlink. When i3-nagbar
304 * recognizes it’s started as a binary ending in .nagbar_cmd, it strips off
305 * the .nagbar_cmd suffix and runs /bin/sh on argv[0]. That way, we can run
306 * a shell script on a noexec filesystem.
308 * From a security point of view, i3-nagbar is just an alias to /bin/sh in
309 * certain circumstances. This should not open any new security issues, I
312 const size_t argv0_len = strlen(argv[0]);
313 if (argv0_len > strlen(".nagbar_cmd") &&
314 strcmp(argv[0] + argv0_len - strlen(".nagbar_cmd"), ".nagbar_cmd") == 0) {
316 cmd = strdup(argv[0]);
317 *(cmd + argv0_len - strlen(".nagbar_cmd")) = '\0';
318 execl("/bin/sh", "/bin/sh", cmd, NULL);
319 err(EXIT_FAILURE, "execv(/bin/sh, /bin/sh, %s)", cmd);
324 char *pattern = sstrdup("-misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1");
325 int o, option_index = 0;
326 enum { TYPE_ERROR = 0, TYPE_WARNING = 1 } bar_type = TYPE_ERROR;
328 static struct option long_options[] = {
329 {"version", no_argument, 0, 'v'},
330 {"font", required_argument, 0, 'f'},
331 {"button", required_argument, 0, 'b'},
332 {"help", no_argument, 0, 'h'},
333 {"message", required_argument, 0, 'm'},
334 {"type", required_argument, 0, 't'},
338 char *options_string = "b:f:m:t:vh";
340 prompt = i3string_from_utf8("Please do not run this program.");
342 while ((o = getopt_long(argc, argv, options_string, long_options, &option_index)) != -1) {
345 printf("i3-nagbar " I3_VERSION);
349 pattern = sstrdup(optarg);
352 i3string_free(prompt);
353 prompt = i3string_from_utf8(optarg);
356 bar_type = (strcasecmp(optarg, "warning") == 0 ? TYPE_WARNING : TYPE_ERROR);
359 printf("i3-nagbar " I3_VERSION "\n");
360 printf("i3-nagbar [-m <message>] [-b <button> <action>] [-t warning|error] [-f <font>] [-v]\n");
363 buttons = realloc(buttons, sizeof(button_t) * (buttoncnt + 1));
364 buttons[buttoncnt].label = i3string_from_utf8(optarg);
365 buttons[buttoncnt].action = argv[optind];
366 printf("button with label *%s* and action *%s*\n",
367 i3string_as_utf8(buttons[buttoncnt].label),
368 buttons[buttoncnt].action);
370 printf("now %d buttons\n", buttoncnt);
378 if ((conn = xcb_connect(NULL, &screens)) == NULL ||
379 xcb_connection_has_error(conn))
380 die("Cannot open display\n");
382 /* Place requests for the atoms we need as soon as possible */
383 #define xmacro(atom) \
384 xcb_intern_atom_cookie_t atom ## _cookie = xcb_intern_atom(conn, 0, strlen(#atom), #atom);
385 #include "atoms.xmacro"
388 root_screen = xcb_aux_get_screen(conn, screens);
389 root = root_screen->root;
391 if (bar_type == TYPE_ERROR) {
392 /* Red theme for error messages */
393 color_button_background = get_colorpixel("#680a0a");
394 color_background = get_colorpixel("#900000");
395 color_text = get_colorpixel("#ffffff");
396 color_border = get_colorpixel("#d92424");
397 color_border_bottom = get_colorpixel("#470909");
399 /* Yellowish theme for warnings */
400 color_button_background = get_colorpixel("#ffc100");
401 color_background = get_colorpixel("#ffa8000");
402 color_text = get_colorpixel("#000000");
403 color_border = get_colorpixel("#ab7100");
404 color_border_bottom = get_colorpixel("#ab7100");
407 font = load_font(pattern, true);
410 /* Open an input window */
411 win = xcb_generate_id(conn);
415 XCB_COPY_FROM_PARENT,
416 win, /* the window id */
417 root, /* parent == root */
418 50, 50, 500, font.height + 8 + 8 /* 8 px padding */, /* dimensions */
419 0, /* x11 border = 0, we draw our own */
420 XCB_WINDOW_CLASS_INPUT_OUTPUT,
421 XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
422 XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK,
424 0, /* back pixel: black */
425 XCB_EVENT_MASK_EXPOSURE |
426 XCB_EVENT_MASK_STRUCTURE_NOTIFY |
427 XCB_EVENT_MASK_BUTTON_PRESS |
428 XCB_EVENT_MASK_BUTTON_RELEASE
431 /* Map the window (make it visible) */
432 xcb_map_window(conn, win);
434 /* Setup NetWM atoms */
435 #define xmacro(name) \
437 xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(conn, name ## _cookie, NULL); \
439 die("Could not get atom " # name "\n"); \
441 A_ ## name = reply->atom; \
444 #include "atoms.xmacro"
448 xcb_change_property(conn,
449 XCB_PROP_MODE_REPLACE,
451 A__NET_WM_WINDOW_TYPE,
455 (unsigned char*) &A__NET_WM_WINDOW_TYPE_DOCK);
457 /* Reserve some space at the top of the screen */
463 uint32_t left_start_y;
465 uint32_t right_start_y;
466 uint32_t right_end_y;
467 uint32_t top_start_x;
469 uint32_t bottom_start_x;
470 uint32_t bottom_end_x;
471 } __attribute__((__packed__)) strut_partial = {0,};
473 strut_partial.top = font.height + 6;
474 strut_partial.top_start_x = 0;
475 strut_partial.top_end_x = 800;
477 xcb_change_property(conn,
478 XCB_PROP_MODE_REPLACE,
480 A__NET_WM_STRUT_PARTIAL,
487 pixmap = xcb_generate_id(conn);
488 pixmap_gc = xcb_generate_id(conn);
489 xcb_create_pixmap(conn, root_screen->root_depth, pixmap, win, 500, font.height + 8);
490 xcb_create_gc(conn, pixmap_gc, pixmap, 0, 0);
492 /* Grab the keyboard to get all input */
495 xcb_generic_event_t *event;
496 while ((event = xcb_wait_for_event(conn)) != NULL) {
497 if (event->response_type == 0) {
498 fprintf(stderr, "X11 Error received! sequence %x\n", event->sequence);
502 /* Strip off the highest bit (set if the event is generated) */
503 int type = (event->response_type & 0x7F);
507 handle_expose(conn, (xcb_expose_event_t*)event);
510 case XCB_BUTTON_PRESS:
511 handle_button_press(conn, (xcb_button_press_event_t*)event);
514 case XCB_BUTTON_RELEASE:
515 handle_button_release(conn, (xcb_button_release_event_t*)event);
518 case XCB_CONFIGURE_NOTIFY: {
519 xcb_configure_notify_event_t *configure_notify = (xcb_configure_notify_event_t*)event;
520 rect = (xcb_rectangle_t){
523 configure_notify->width,
524 configure_notify->height
527 /* Recreate the pixmap / gc */
528 xcb_free_pixmap(conn, pixmap);
529 xcb_free_gc(conn, pixmap_gc);
531 xcb_create_pixmap(conn, root_screen->root_depth, pixmap, win, rect.width, rect.height);
532 xcb_create_gc(conn, pixmap_gc, pixmap, 0, 0);