/*
* vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
* © 2009 Michael Stapelberg and contributors (see also: LICENSE)
*
* i3-nagbar is a utility which displays a nag message, for example in the case
* when the user has an error in their configuration file.
*
*/
#include <config.h>
#include "libi3.h"
#include <err.h>
#include <fcntl.h>
#include <getopt.h>
#include <limits.h>
#include <paths.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <xcb/randr.h>
#include <xcb/xcb.h>
#include <xcb/xcb_aux.h>
#include <xcb/xcb_cursor.h>
xcb_visualtype_t *visual_type = NULL;
#define SN_API_NOT_YET_FROZEN 1
#include <libsn/sn-launchee.h>
#include "i3-nagbar-atoms.xmacro.h"
#define MSG_PADDING logical_px(8)
#define BTN_PADDING logical_px(3)
#define BTN_BORDER logical_px(3)
#define BTN_GAP logical_px(20)
#define CLOSE_BTN_GAP logical_px(15)
#define BAR_BORDER logical_px(2)
#define xmacro(atom) xcb_atom_t A_##atom;
NAGBAR_ATOMS_XMACRO
#undef xmacro
#define die(...) errx(EXIT_FAILURE, __VA_ARGS__);
static char *argv0 = NULL;
typedef struct {
i3String *label;
char *action;
int16_t x;
uint16_t width;
bool terminal;
} button_t;
static xcb_window_t win;
static surface_t bar;
static i3Font font;
static i3String *prompt;
static button_t btn_close;
static button_t *buttons;
static int buttoncnt;
/* Result of get_colorpixel() for the various colors. */
static color_t color_background; /* background of the bar */
static color_t color_button_background; /* background for buttons */
static color_t color_border; /* color of the button border */
static color_t color_border_bottom; /* color of the bottom border */
static color_t color_text; /* color of the text */
xcb_window_t root;
xcb_connection_t *conn;
xcb_screen_t *root_screen;
/*
* Having verboselog(), errorlog() and debuglog() is necessary when using libi3.
*
*/
void verboselog(char *fmt, ...) {
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
}
void errorlog(char *fmt, ...) {
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
}
void debuglog(char *fmt, ...) {
}
/*
* Starts the given application by passing it through a shell. We use double
* fork to avoid zombie processes. As the started application’s parent exits
* (immediately), the application is reparented to init (process-id 1), which
* correctly handles children, so we don’t have to do it :-).
*/
static void start_application(const char *command) {
printf("executing: %s\n", command);
if (fork() == 0) {
/* Child process */
setsid();
if (fork() == 0) {
/* This is the child */
execl(_PATH_BSHELL, _PATH_BSHELL, "-c", command, NULL);
/* not reached */
}
exit(0);
}
wait(0);
}
static button_t *get_button_at(int16_t x, int16_t y) {
for (int c = 0; c < buttoncnt; c++)
if (x >= (buttons[c].x) && x <= (buttons[c].x + buttons[c].width))
return &buttons[c];
return NULL;
}
static void handle_button_press(xcb_connection_t *conn, xcb_button_press_event_t *event) {
printf("button pressed on x = %d, y = %d\n",
event->event_x, event->event_y);
/* TODO: set a flag for the button, re-render */
}
/*
* Called when the user releases the mouse button. Checks whether the
* coordinates are over a button and executes the appropriate action.
*
*/
static void handle_button_release(xcb_connection_t *conn, xcb_button_release_event_t *event) {
printf("button released on x = %d, y = %d\n",
event->event_x, event->event_y);
/* If the user hits the close button, we exit(0) */
if (event->event_x >= btn_close.x && event->event_x < btn_close.x + btn_close.width)
exit(0);
button_t *button = get_button_at(event->event_x, event->event_y);
if (!button)
return;
/* We need to create a custom script containing our actual command
* since not every terminal emulator which is contained in
* i3-sensible-terminal supports -e with multiple arguments (and not
* all of them support -e with one quoted argument either).
*
* NB: The paths need to be unique, that is, don’t assume users close
* their nagbars at any point in time (and they still need to work).
* */
char *script_path = get_process_filename("nagbar-cmd");
int fd = open(script_path, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
if (fd == -1) {
warn("Could not create temporary script to store the nagbar command");
return;
}
FILE *script = fdopen(fd, "w");
if (script == NULL) {
warn("Could not fdopen() temporary script to store the nagbar command");
return;
}
fprintf(script, "#!%s\nrm %s\n%s", _PATH_BSHELL, script_path, button->action);
/* Also closes fd */
fclose(script);
char *link_path;
char *exe_path = get_exe_path(argv0);
sasprintf(&link_path, "%s.nagbar_cmd", script_path);
if (symlink(exe_path, link_path) == -1) {
err(EXIT_FAILURE, "Failed to symlink %s to %s", link_path, exe_path);
}
char *terminal_cmd;
if (button->terminal) {
sasprintf(&terminal_cmd, "i3-sensible-terminal -e %s", link_path);
} else {
terminal_cmd = sstrdup(link_path);
}
printf("argv0 = %s\n", argv0);
printf("terminal_cmd = %s\n", terminal_cmd);
start_application(terminal_cmd);
free(link_path);
free(terminal_cmd);
free(script_path);
free(exe_path);
/* TODO: unset flag, re-render */
}
/*
* Draws a button and returns its width
*
*/
static int button_draw(button_t *button, int position) {
int text_width = predict_text_width(button->label);
button->width = text_width + 2 * BTN_PADDING + 2 * BTN_BORDER;
button->x = position - button->width;
/* draw border */
draw_util_rectangle(&bar, color_border,
position - button->width,
MSG_PADDING - BTN_PADDING - BTN_BORDER,
button->width,
font.height + 2 * BTN_PADDING + 2 * BTN_BORDER);
/* draw background */
draw_util_rectangle(&bar, color_button_background,
position - button->width + BTN_BORDER,
MSG_PADDING - BTN_PADDING,
text_width + 2 * BTN_PADDING,
font.height + 2 * BTN_PADDING);
/* draw label */
draw_util_text(button->label, &bar, color_text, color_button_background,
position - button->width + BTN_BORDER + BTN_PADDING,
MSG_PADDING,
200);
return button->width;
}
/*
* Handles expose events (redraws of the window) and rendering in general. Will
* be called from the code with event == NULL or from X with event != NULL.
*
*/
static int handle_expose(xcb_connection_t *conn, xcb_expose_event_t *event) {
/* draw background */
draw_util_clear_surface(&bar, color_background);
/* draw message */
draw_util_text(prompt, &bar, color_text, color_background,
MSG_PADDING, MSG_PADDING,
bar.width - 2 * MSG_PADDING);
int position = bar.width - (MSG_PADDING - BTN_BORDER - BTN_PADDING);
/* render close button */
position -= button_draw(&btn_close, position);
position -= CLOSE_BTN_GAP;
/* render custom buttons */
for (int i = 0; i < buttoncnt; i++) {
position -= BTN_GAP;
position -= button_draw(&buttons[i], position);
}
/* border line at the bottom */
draw_util_rectangle(&bar, color_border_bottom, 0, bar.height - BAR_BORDER, bar.width, BAR_BORDER);
xcb_flush(conn);
return 1;
}
/**
* Tries to position the rectangle on the primary output.
*/
static void set_window_position_primary(xcb_rectangle_t *result) {
xcb_randr_get_screen_resources_current_cookie_t rcookie = xcb_randr_get_screen_resources_current(conn, root);
xcb_randr_get_output_primary_cookie_t pcookie = xcb_randr_get_output_primary(conn, root);
xcb_randr_get_output_primary_reply_t *primary = NULL;
xcb_randr_get_screen_resources_current_reply_t *res = NULL;
if ((primary = xcb_randr_get_output_primary_reply(conn, pcookie, NULL)) == NULL) {
LOG("Could not determine the primary output.\n");
goto free_resources;
}
if ((res = xcb_randr_get_screen_resources_current_reply(conn, rcookie, NULL)) == NULL) {
LOG("Could not query screen resources.\n");
goto free_resources;
}
xcb_randr_get_output_info_reply_t *output =
xcb_randr_get_output_info_reply(conn,
xcb_randr_get_output_info(conn, primary->output, res->config_timestamp),
NULL);
if (output == NULL || output->crtc == XCB_NONE) {
LOG("Could not query primary screen.\n");
goto free_resources;
}
xcb_randr_get_crtc_info_reply_t *crtc =
xcb_randr_get_crtc_info_reply(conn,
xcb_randr_get_crtc_info(conn, output->crtc, res->config_timestamp),
NULL);
if (crtc == NULL) {
LOG("Could not get CRTC.\n");
goto free_resources;
}
LOG("Found primary output on position x = %i / y = %i / w = %i / h = %i.\n",
crtc->x, crtc->y, crtc->width, crtc->height);
if (crtc->width == 0 || crtc->height == 0) {
LOG("Primary output is not active, ignoring it.\n");
goto free_resources;
}
result->x = crtc->x;
result->y = crtc->y;
goto free_resources;
free_resources:
free(res);
free(primary);
}
/**
* Tries to position the rectangle on the output with input focus.
* If unsuccessful, try to position on primary output.
*/
static void set_window_position_focus(xcb_rectangle_t *result) {
bool success = false;
xcb_get_input_focus_reply_t *input_focus = NULL;
xcb_get_geometry_reply_t *geometry = NULL;
xcb_translate_coordinates_reply_t *coordinates = NULL;
/* To avoid the input window disappearing while determining its position */
xcb_grab_server(conn);
input_focus = xcb_get_input_focus_reply(conn, xcb_get_input_focus(conn), NULL);
if (input_focus == NULL || input_focus->focus == XCB_NONE) {
LOG("Failed to receive the current input focus or no window has the input focus right now.\n");
goto free_resources;
}
geometry = xcb_get_geometry_reply(conn, xcb_get_geometry(conn, input_focus->focus), NULL);
if (geometry == NULL) {
LOG("Failed to received window geometry.\n");
goto free_resources;
}
coordinates = xcb_translate_coordinates_reply(
conn, xcb_translate_coordinates(conn, input_focus->focus, root, geometry->x, geometry->y), NULL);
if (coordinates == NULL) {
LOG("Failed to translate coordinates.\n");
goto free_resources;
}
LOG("Found current focus at x = %i / y = %i.\n", coordinates->dst_x, coordinates->dst_y);
result->x = coordinates->dst_x;
result->y = coordinates->dst_y;
success = true;
free_resources:
xcb_ungrab_server(conn);
free(input_focus);
free(coordinates);
free(geometry);
if (!success) {
LOG("Could not position on focused output, trying to position on primary output.\n");
set_window_position_primary(result);
}
}
int main(int argc, char *argv[]) {
/* The following lines are a terribly horrible kludge. Because terminal
* emulators have different ways of interpreting the -e command line
* argument (some need -e "less /etc/fstab", others need -e less
* /etc/fstab), we need to write commands to a script and then just run
* that script. However, since on some machines, $XDG_RUNTIME_DIR and
* $TMPDIR are mounted with noexec, we cannot directly execute the script
* either.
*
* Initially, we tried to pass the command via the environment variable
* _I3_NAGBAR_CMD. But turns out that some terminal emulators such as
* xfce4-terminal run all windows from a single master process and only
* pass on the command (not the environment) to that master process.
*
* Therefore, we symlink i3-nagbar (which MUST reside on an executable
* filesystem) with a special name and run that symlink. When i3-nagbar
* recognizes it’s started as a binary ending in .nagbar_cmd, it strips off
* the .nagbar_cmd suffix and runs /bin/sh on argv[0]. That way, we can run
* a shell script on a noexec filesystem.
*
* From a security point of view, i3-nagbar is just an alias to /bin/sh in
* certain circumstances. This should not open any new security issues, I
* hope. */
char *cmd = NULL;
const size_t argv0_len = strlen(argv[0]);
if (argv0_len > strlen(".nagbar_cmd") &&
strcmp(argv[0] + argv0_len - strlen(".nagbar_cmd"), ".nagbar_cmd") == 0) {
unlink(argv[0]);
cmd = sstrdup(argv[0]);
*(cmd + argv0_len - strlen(".nagbar_cmd")) = '\0';
execl(_PATH_BSHELL, _PATH_BSHELL, cmd, NULL);
err(EXIT_FAILURE, "execl(%s, %s, %s)", _PATH_BSHELL, _PATH_BSHELL, cmd);
}
argv0 = argv[0];
bool position_on_primary = false;
char *pattern = sstrdup("pango:monospace 8");
int o, option_index = 0;
enum { TYPE_ERROR = 0,
TYPE_WARNING = 1 } bar_type = TYPE_ERROR;
static struct option long_options[] = {
{"version", no_argument, 0, 'v'},
{"font", required_argument, 0, 'f'},
{"button", required_argument, 0, 'b'},
{"button-no-terminal", required_argument, 0, 'B'},
{"help", no_argument, 0, 'h'},
{"message", required_argument, 0, 'm'},
{"type", required_argument, 0, 't'},
{"primary", no_argument, 0, 'p'},
{0, 0, 0, 0}};
char *options_string = "b:B:f:m:t:vhp";
prompt = i3string_from_utf8("Please do not run this program.");
while ((o = getopt_long(argc, argv, options_string, long_options, &option_index)) != -1) {
switch (o) {
case 'v':
free(pattern);
printf("i3-nagbar " I3_VERSION "\n");
return 0;
case 'f':
free(pattern);
pattern = sstrdup(optarg);
break;
case 'm':
i3string_free(prompt);
prompt = i3string_from_utf8(optarg);
break;
case 't':
bar_type = (strcasecmp(optarg, "warning") == 0 ? TYPE_WARNING : TYPE_ERROR);
break;
case 'h':
free(pattern);
printf("i3-nagbar " I3_VERSION "\n");
printf("i3-nagbar [-m <message>] [-b <button> <action>] [-B <button> <action>] [-t warning|error] [-f <font>] [-v] [-p]\n");
return 0;
case 'p':
position_on_primary = true;
break;
case 'b':
case 'B':
buttons = srealloc(buttons, sizeof(button_t) * (buttoncnt + 1));
buttons[buttoncnt].label = i3string_from_utf8(optarg);
buttons[buttoncnt].action = argv[optind];
buttons[buttoncnt].terminal = (o == 'b');
printf("button with label *%s* and action *%s*\n",
i3string_as_utf8(buttons[buttoncnt].label),
buttons[buttoncnt].action);
buttoncnt++;
printf("now %d buttons\n", buttoncnt);
if (optind < argc)
optind++;
break;
}
}
btn_close.label = i3string_from_utf8("X");
int screens;
if ((conn = xcb_connect(NULL, &screens)) == NULL ||
xcb_connection_has_error(conn))
die("Cannot open display");
/* Place requests for the atoms we need as soon as possible */
#define xmacro(atom) \
xcb_intern_atom_cookie_t atom##_cookie = xcb_intern_atom(conn, 0, strlen(#atom), #atom);
NAGBAR_ATOMS_XMACRO
#undef xmacro
/* Init startup notification. */
SnDisplay *sndisplay = sn_xcb_display_new(conn, NULL, NULL);
SnLauncheeContext *sncontext = sn_launchee_context_new_from_environment(sndisplay, screens);
sn_display_unref(sndisplay);
root_screen = xcb_aux_get_screen(conn, screens);
root = root_screen->root;
if (bar_type == TYPE_ERROR) {
/* Red theme for error messages */
color_button_background = draw_util_hex_to_color("#680a0a");
color_background = draw_util_hex_to_color("#900000");
color_text = draw_util_hex_to_color("#ffffff");
color_border = draw_util_hex_to_color("#d92424");
color_border_bottom = draw_util_hex_to_color("#470909");
} else {
/* Yellowish theme for warnings */
color_button_background = draw_util_hex_to_color("#ffc100");
color_background = draw_util_hex_to_color("#ffa8000");
color_text = draw_util_hex_to_color("#000000");
color_border = draw_util_hex_to_color("#ab7100");
color_border_bottom = draw_util_hex_to_color("#ab7100");
}
init_dpi();
font = load_font(pattern, true);
set_font(&font);
#if defined(__OpenBSD__)
if (pledge("stdio rpath wpath cpath getpw proc exec", NULL) == -1)
err(EXIT_FAILURE, "pledge");
#endif
/* Default values if we cannot determine the preferred window position. */
xcb_rectangle_t win_pos = (xcb_rectangle_t){50, 50, 500, font.height + 2 * MSG_PADDING + BAR_BORDER};
if (position_on_primary) {
set_window_position_primary(&win_pos);
} else {
set_window_position_focus(&win_pos);
}
xcb_cursor_context_t *cursor_ctx;
if (xcb_cursor_context_new(conn, root_screen, &cursor_ctx) < 0) {
errx(EXIT_FAILURE, "Cannot allocate xcursor context");
}
xcb_cursor_t cursor = xcb_cursor_load_cursor(cursor_ctx, "left_ptr");
xcb_cursor_context_free(cursor_ctx);
/* Open an input window */
win = xcb_generate_id(conn);
xcb_create_window(
conn,
XCB_COPY_FROM_PARENT,
win, /* the window id */
root, /* parent == root */
win_pos.x, win_pos.y, win_pos.width, win_pos.height, /* dimensions */
0, /* x11 border = 0, we draw our own */
XCB_WINDOW_CLASS_INPUT_OUTPUT,
XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK | XCB_CW_CURSOR,
(uint32_t[]){
0, /* back pixel: black */
XCB_EVENT_MASK_EXPOSURE |
XCB_EVENT_MASK_STRUCTURE_NOTIFY |
XCB_EVENT_MASK_BUTTON_PRESS |
XCB_EVENT_MASK_BUTTON_RELEASE,
cursor});
if (sncontext) {
sn_launchee_context_setup_window(sncontext, win);
}
/* Map the window (make it visible) */
xcb_map_window(conn, win);
/* Setup NetWM atoms */
#define xmacro(name) \
do { \
xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(conn, name##_cookie, NULL); \
if (!reply) \
die("Could not get atom " #name); \
\
A_##name = reply->atom; \
free(reply); \
} while (0);
NAGBAR_ATOMS_XMACRO
#undef xmacro
/* Set dock mode */
xcb_change_property(conn,
XCB_PROP_MODE_REPLACE,
win,
A__NET_WM_WINDOW_TYPE,
A_ATOM,
32,
1,
(unsigned char *)&A__NET_WM_WINDOW_TYPE_DOCK);
/* Reserve some space at the top of the screen */
struct {
uint32_t left;
uint32_t right;
uint32_t top;
uint32_t bottom;
uint32_t left_start_y;
uint32_t left_end_y;
uint32_t right_start_y;
uint32_t right_end_y;
uint32_t top_start_x;
uint32_t top_end_x;
uint32_t bottom_start_x;
uint32_t bottom_end_x;
} __attribute__((__packed__)) strut_partial;
memset(&strut_partial, 0, sizeof(strut_partial));
strut_partial.top = font.height + logical_px(6);
strut_partial.top_start_x = 0;
strut_partial.top_end_x = 800;
xcb_change_property(conn,
XCB_PROP_MODE_REPLACE,
win,
A__NET_WM_STRUT_PARTIAL,
A_CARDINAL,
32,
12,
&strut_partial);
/* Initialize the drawable bar */
draw_util_surface_init(conn, &bar, win, get_visualtype(root_screen), win_pos.width, win_pos.height);
/* Startup complete. */
if (sncontext) {
sn_launchee_context_complete(sncontext);
sn_launchee_context_unref(sncontext);
}
/* Grab the keyboard to get all input */
xcb_flush(conn);
xcb_generic_event_t *event;
while ((event = xcb_wait_for_event(conn)) != NULL) {
if (event->response_type == 0) {
fprintf(stderr, "X11 Error received! sequence %x\n", event->sequence);
continue;
}
/* Strip off the highest bit (set if the event is generated) */
int type = (event->response_type & 0x7F);
switch (type) {
case XCB_EXPOSE:
if (((xcb_expose_event_t *)event)->count == 0) {
handle_expose(conn, (xcb_expose_event_t *)event);
}
break;
case XCB_BUTTON_PRESS:
handle_button_press(conn, (xcb_button_press_event_t *)event);
break;
case XCB_BUTTON_RELEASE:
handle_button_release(conn, (xcb_button_release_event_t *)event);
break;
case XCB_CONFIGURE_NOTIFY: {
xcb_configure_notify_event_t *configure_notify = (xcb_configure_notify_event_t *)event;
if (configure_notify->width > 0 && configure_notify->height > 0) {
draw_util_surface_set_size(&bar, configure_notify->width, configure_notify->height);
}
break;
}
}
free(event);
}
free(pattern);
draw_util_surface_free(conn, &bar);
return 0;
}