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 their configuration file.
12 #include <sys/types.h>
28 #include <xcb/xcb_aux.h>
29 #include <xcb/xcb_event.h>
32 #include "i3-nagbar.h"
34 static char *argv0 = NULL;
43 static xcb_window_t win;
44 static xcb_pixmap_t pixmap;
45 static xcb_gcontext_t pixmap_gc;
46 static xcb_rectangle_t rect = {0, 0, 600, 20};
48 static i3String *prompt;
49 static button_t *buttons;
52 /* Result of get_colorpixel() for the various colors. */
53 static uint32_t color_background; /* background of the bar */
54 static uint32_t color_button_background; /* background for buttons */
55 static uint32_t color_border; /* color of the button border */
56 static uint32_t color_border_bottom; /* color of the bottom border */
57 static uint32_t color_text; /* color of the text */
60 xcb_connection_t *conn;
61 xcb_screen_t *root_screen;
64 * Having verboselog(), errorlog() and debuglog() is necessary when using libi3.
67 void verboselog(char *fmt, ...) {
71 vfprintf(stdout, fmt, args);
75 void errorlog(char *fmt, ...) {
79 vfprintf(stderr, fmt, args);
83 void debuglog(char *fmt, ...) {
87 * Starts the given application by passing it through a shell. We use double fork
88 * to avoid zombie processes. As the started application’s parent exits (immediately),
89 * the application is reparented to init (process-id 1), which correctly handles
90 * childs, so we don’t have to do it :-).
92 * The shell is determined by looking for the SHELL environment variable. If it
93 * does not exist, /bin/sh is used.
96 static void start_application(const char *command) {
97 printf("executing: %s\n", command);
102 /* This is the child */
103 execl(_PATH_BSHELL, _PATH_BSHELL, "-c", command, (void *)NULL);
111 static button_t *get_button_at(int16_t x, int16_t y) {
112 for (int c = 0; c < buttoncnt; c++)
113 if (x >= (buttons[c].x) && x <= (buttons[c].x + buttons[c].width))
119 static void handle_button_press(xcb_connection_t *conn, xcb_button_press_event_t *event) {
120 printf("button pressed on x = %d, y = %d\n",
121 event->event_x, event->event_y);
122 /* TODO: set a flag for the button, re-render */
126 * Called when the user releases the mouse button. Checks whether the
127 * coordinates are over a button and executes the appropriate action.
130 static void handle_button_release(xcb_connection_t *conn, xcb_button_release_event_t *event) {
131 printf("button released on x = %d, y = %d\n",
132 event->event_x, event->event_y);
133 /* If the user hits the close button, we exit(0) */
134 if (event->event_x >= (rect.width - 32))
136 button_t *button = get_button_at(event->event_x, event->event_y);
140 /* We need to create a custom script containing our actual command
141 * since not every terminal emulator which is contained in
142 * i3-sensible-terminal supports -e with multiple arguments (and not
143 * all of them support -e with one quoted argument either).
145 * NB: The paths need to be unique, that is, don’t assume users close
146 * their nagbars at any point in time (and they still need to work).
148 char *script_path = get_process_filename("nagbar-cmd");
150 int fd = open(script_path, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
152 warn("Could not create temporary script to store the nagbar command");
155 FILE *script = fdopen(fd, "w");
156 if (script == NULL) {
157 warn("Could not fdopen() temporary script to store the nagbar command");
160 fprintf(script, "#!/bin/sh\nrm %s\n%s", script_path, button->action);
165 char *exe_path = get_exe_path(argv0);
166 sasprintf(&link_path, "%s.nagbar_cmd", script_path);
167 if (symlink(exe_path, link_path) == -1) {
168 err(EXIT_FAILURE, "Failed to symlink %s to %s", link_path, exe_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);
183 /* TODO: unset flag, re-render */
187 * Handles expose events (redraws of the window) and rendering in general. Will
188 * be called from the code with event == NULL or from X with event != NULL.
191 static int handle_expose(xcb_connection_t *conn, xcb_expose_event_t *event) {
192 /* re-draw the background */
193 xcb_change_gc(conn, pixmap_gc, XCB_GC_FOREGROUND, (uint32_t[]){color_background});
194 xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &rect);
196 /* restore font color */
197 set_font_colors(pixmap_gc, color_text, color_background);
198 draw_text(prompt, pixmap, pixmap_gc,
199 4 + 4, 4 + 4, rect.width - 4 - 4);
201 /* render close button */
202 const char *close_button_label = "X";
204 /* set width to the width of the label */
205 int w = predict_text_width(i3string_from_utf8(close_button_label));
206 /* account for left/right padding, which seems to be set to 8px (total) below */
210 values[0] = color_button_background;
211 values[1] = line_width;
212 xcb_change_gc(conn, pixmap_gc, XCB_GC_FOREGROUND | XCB_GC_LINE_WIDTH, values);
214 xcb_rectangle_t close = {y - w - (2 * line_width), 0, w + (2 * line_width), rect.height};
215 xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &close);
217 xcb_change_gc(conn, pixmap_gc, XCB_GC_FOREGROUND, (uint32_t[]){color_border});
218 xcb_point_t points[] = {
219 {y - w - (2 * line_width), line_width / 2},
220 {y - (line_width / 2), line_width / 2},
221 {y - (line_width / 2), (rect.height - (line_width / 2)) - 2},
222 {y - w - (2 * line_width), (rect.height - (line_width / 2)) - 2},
223 {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}};
256 xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, pixmap, pixmap_gc, 5, points2);
258 values[0] = color_text;
259 values[1] = color_button_background;
260 set_font_colors(pixmap_gc, color_text, color_button_background);
261 /* the x term seems to set left/right padding */
262 draw_text(buttons[c].label, pixmap, pixmap_gc,
263 y - w - line_width + 6, 4 + 3, rect.width - y + w + line_width - 6);
268 /* border line at the bottom */
270 values[0] = color_border_bottom;
271 values[1] = line_width;
272 xcb_change_gc(conn, pixmap_gc, XCB_GC_FOREGROUND | XCB_GC_LINE_WIDTH, values);
273 xcb_point_t bottom[] = {
274 {0, rect.height - 0},
275 {rect.width, rect.height - 0}};
276 xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, pixmap, pixmap_gc, 2, bottom);
278 /* Copy the contents of the pixmap to the real window */
279 xcb_copy_area(conn, pixmap, win, pixmap_gc, 0, 0, 0, 0, rect.width, rect.height);
285 int main(int argc, char *argv[]) {
286 /* The following lines are a terribly horrible kludge. Because terminal
287 * emulators have different ways of interpreting the -e command line
288 * argument (some need -e "less /etc/fstab", others need -e less
289 * /etc/fstab), we need to write commands to a script and then just run
290 * that script. However, since on some machines, $XDG_RUNTIME_DIR and
291 * $TMPDIR are mounted with noexec, we cannot directly execute the script
294 * Initially, we tried to pass the command via the environment variable
295 * _I3_NAGBAR_CMD. But turns out that some terminal emulators such as
296 * xfce4-terminal run all windows from a single master process and only
297 * pass on the command (not the environment) to that master process.
299 * Therefore, we symlink i3-nagbar (which MUST reside on an executable
300 * filesystem) with a special name and run that symlink. When i3-nagbar
301 * recognizes it’s started as a binary ending in .nagbar_cmd, it strips off
302 * the .nagbar_cmd suffix and runs /bin/sh on argv[0]. That way, we can run
303 * a shell script on a noexec filesystem.
305 * From a security point of view, i3-nagbar is just an alias to /bin/sh in
306 * certain circumstances. This should not open any new security issues, I
309 const size_t argv0_len = strlen(argv[0]);
310 if (argv0_len > strlen(".nagbar_cmd") &&
311 strcmp(argv[0] + argv0_len - strlen(".nagbar_cmd"), ".nagbar_cmd") == 0) {
313 cmd = strdup(argv[0]);
314 *(cmd + argv0_len - strlen(".nagbar_cmd")) = '\0';
315 execl("/bin/sh", "/bin/sh", cmd, NULL);
316 err(EXIT_FAILURE, "execv(/bin/sh, /bin/sh, %s)", cmd);
321 char *pattern = sstrdup("-misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1");
322 int o, option_index = 0;
323 enum { TYPE_ERROR = 0,
324 TYPE_WARNING = 1 } bar_type = TYPE_ERROR;
326 static struct option long_options[] = {
327 {"version", no_argument, 0, 'v'},
328 {"font", required_argument, 0, 'f'},
329 {"button", required_argument, 0, 'b'},
330 {"help", no_argument, 0, 'h'},
331 {"message", required_argument, 0, 'm'},
332 {"type", required_argument, 0, 't'},
335 char *options_string = "b:f:m:t:vh";
337 prompt = i3string_from_utf8("Please do not run this program.");
339 while ((o = getopt_long(argc, argv, options_string, long_options, &option_index)) != -1) {
342 printf("i3-nagbar " I3_VERSION "\n");
346 pattern = sstrdup(optarg);
349 i3string_free(prompt);
350 prompt = i3string_from_utf8(optarg);
353 bar_type = (strcasecmp(optarg, "warning") == 0 ? TYPE_WARNING : TYPE_ERROR);
356 printf("i3-nagbar " I3_VERSION "\n");
357 printf("i3-nagbar [-m <message>] [-b <button> <action>] [-t warning|error] [-f <font>] [-v]\n");
360 buttons = realloc(buttons, sizeof(button_t) * (buttoncnt + 1));
361 buttons[buttoncnt].label = i3string_from_utf8(optarg);
362 buttons[buttoncnt].action = argv[optind];
363 printf("button with label *%s* and action *%s*\n",
364 i3string_as_utf8(buttons[buttoncnt].label),
365 buttons[buttoncnt].action);
367 printf("now %d buttons\n", buttoncnt);
375 if ((conn = xcb_connect(NULL, &screens)) == NULL ||
376 xcb_connection_has_error(conn))
377 die("Cannot open display\n");
379 /* Place requests for the atoms we need as soon as possible */
380 #define xmacro(atom) \
381 xcb_intern_atom_cookie_t atom##_cookie = xcb_intern_atom(conn, 0, strlen(#atom), #atom);
382 #include "atoms.xmacro"
385 root_screen = xcb_aux_get_screen(conn, screens);
386 root = root_screen->root;
388 if (bar_type == TYPE_ERROR) {
389 /* Red theme for error messages */
390 color_button_background = get_colorpixel("#680a0a");
391 color_background = get_colorpixel("#900000");
392 color_text = get_colorpixel("#ffffff");
393 color_border = get_colorpixel("#d92424");
394 color_border_bottom = get_colorpixel("#470909");
396 /* Yellowish theme for warnings */
397 color_button_background = get_colorpixel("#ffc100");
398 color_background = get_colorpixel("#ffa8000");
399 color_text = get_colorpixel("#000000");
400 color_border = get_colorpixel("#ab7100");
401 color_border_bottom = get_colorpixel("#ab7100");
404 font = load_font(pattern, true);
407 /* Open an input window */
408 win = xcb_generate_id(conn);
412 XCB_COPY_FROM_PARENT,
413 win, /* the window id */
414 root, /* parent == root */
415 50, 50, 500, font.height + 8 + 8 /* 8 px padding */, /* dimensions */
416 0, /* x11 border = 0, we draw our own */
417 XCB_WINDOW_CLASS_INPUT_OUTPUT,
418 XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
419 XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK,
421 0, /* back pixel: black */
422 XCB_EVENT_MASK_EXPOSURE |
423 XCB_EVENT_MASK_STRUCTURE_NOTIFY |
424 XCB_EVENT_MASK_BUTTON_PRESS |
425 XCB_EVENT_MASK_BUTTON_RELEASE});
427 /* Map the window (make it visible) */
428 xcb_map_window(conn, win);
430 /* Setup NetWM atoms */
431 #define xmacro(name) \
433 xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(conn, name##_cookie, NULL); \
435 die("Could not get atom " #name "\n"); \
437 A_##name = reply->atom; \
440 #include "atoms.xmacro"
444 xcb_change_property(conn,
445 XCB_PROP_MODE_REPLACE,
447 A__NET_WM_WINDOW_TYPE,
451 (unsigned char *)&A__NET_WM_WINDOW_TYPE_DOCK);
453 /* Reserve some space at the top of the screen */
459 uint32_t left_start_y;
461 uint32_t right_start_y;
462 uint32_t right_end_y;
463 uint32_t top_start_x;
465 uint32_t bottom_start_x;
466 uint32_t bottom_end_x;
467 } __attribute__((__packed__)) strut_partial;
468 memset(&strut_partial, 0, sizeof(strut_partial));
470 strut_partial.top = font.height + 6;
471 strut_partial.top_start_x = 0;
472 strut_partial.top_end_x = 800;
474 xcb_change_property(conn,
475 XCB_PROP_MODE_REPLACE,
477 A__NET_WM_STRUT_PARTIAL,
484 pixmap = xcb_generate_id(conn);
485 pixmap_gc = xcb_generate_id(conn);
486 xcb_create_pixmap(conn, root_screen->root_depth, pixmap, win, 500, font.height + 8);
487 xcb_create_gc(conn, pixmap_gc, pixmap, 0, 0);
489 /* Grab the keyboard to get all input */
492 xcb_generic_event_t *event;
493 while ((event = xcb_wait_for_event(conn)) != NULL) {
494 if (event->response_type == 0) {
495 fprintf(stderr, "X11 Error received! sequence %x\n", event->sequence);
499 /* Strip off the highest bit (set if the event is generated) */
500 int type = (event->response_type & 0x7F);
504 handle_expose(conn, (xcb_expose_event_t *)event);
507 case XCB_BUTTON_PRESS:
508 handle_button_press(conn, (xcb_button_press_event_t *)event);
511 case XCB_BUTTON_RELEASE:
512 handle_button_release(conn, (xcb_button_release_event_t *)event);
515 case XCB_CONFIGURE_NOTIFY: {
516 xcb_configure_notify_event_t *configure_notify = (xcb_configure_notify_event_t *)event;
517 rect = (xcb_rectangle_t){
520 configure_notify->width,
521 configure_notify->height};
523 /* Recreate the pixmap / gc */
524 xcb_free_pixmap(conn, pixmap);
525 xcb_free_gc(conn, pixmap_gc);
527 xcb_create_pixmap(conn, root_screen->root_depth, pixmap, win, rect.width, rect.height);
528 xcb_create_gc(conn, pixmap_gc, pixmap, 0, 0);