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lemonbar/bar.c

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#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <signal.h>
#include <poll.h>
#include <getopt.h>
#include <unistd.h>
#include <xcb/xcb.h>
#if XINERAMA
#include <xcb/xinerama.h>
#endif
#include "config.h"
// Here be dragons
#define MAX(a,b) ((a > b) ? a : b)
typedef struct fontset_item_t {
xcb_font_t xcb_ft;
xcb_charinfo_t *table;
int descent;
int avg_height;
unsigned short char_max;
unsigned short char_min;
} fontset_item_t;
enum {
FONT_MAIN,
FONT_FALLBACK,
FONT_MAX
};
enum {
ALIGN_L = 0,
ALIGN_C,
ALIGN_R
};
typedef struct screen_t {
int x;
int width;
xcb_window_t window;
} screen_t;
static xcb_connection_t *c;
static xcb_drawable_t canvas;
static xcb_gcontext_t draw_gc;
static xcb_gcontext_t clear_gc;
static xcb_gcontext_t underl_gc;
static int bar_width;
static int bar_bottom = BAR_BOTTOM;
static int force_docking = 0;
static fontset_item_t fontset[FONT_MAX];
static fontset_item_t *sel_font = NULL;
static screen_t *screens;
static int num_screens;
static const unsigned palette[] = {COLOR0,COLOR1,COLOR2,COLOR3,COLOR4,COLOR5,COLOR6,COLOR7,COLOR8,COLOR9,BACKGROUND,FOREGROUND};
#if XINERAMA
static const char *control_characters = "fbulcsr";
#else
static const char *control_characters = "fbulcr";
#endif
static inline void
xcb_set_bg (int i)
{
xcb_change_gc (c, draw_gc , XCB_GC_BACKGROUND, (const unsigned []){ palette[i] });
xcb_change_gc (c, clear_gc , XCB_GC_FOREGROUND, (const unsigned []){ palette[i] });
}
static inline void
xcb_set_fg (int i)
{
xcb_change_gc (c, draw_gc , XCB_GC_FOREGROUND, (const uint32_t []){ palette[i] });
}
static inline void
xcb_set_ud (int i)
{
xcb_change_gc (c, underl_gc, XCB_GC_FOREGROUND, (const uint32_t []){ palette[i] });
}
static inline void
xcb_fill_rect (xcb_gcontext_t gc, int x, int y, int width, int height)
{
xcb_poly_fill_rectangle (c, canvas, gc, 1, (const xcb_rectangle_t []){ { x, y, width, height } });
}
static inline void
xcb_set_fontset (int i)
{
if (sel_font != &fontset[i]) {
sel_font = &fontset[i];
xcb_change_gc (c, draw_gc , XCB_GC_FONT, (const uint32_t []){ sel_font->xcb_ft });
}
}
int
draw_char (screen_t *screen, int x, int align, uint16_t ch)
{
int ch_width;
ch_width = (ch > sel_font->char_min && ch < sel_font->char_max) ?
sel_font->table[ch - sel_font->char_min].character_width :
0;
/* Some fonts (such as anorexia) have the space char with the width set to 0 */
if (ch_width == 0)
ch_width = BAR_FONT_FALLBACK_WIDTH;
switch (align) {
case ALIGN_C:
xcb_copy_area (c, canvas, canvas, draw_gc, screen->width / 2 - x / 2 + screen->x, 0,
screen->width / 2 - (x + ch_width) / 2 + screen->x, 0, x, BAR_HEIGHT);
x = screen->width / 2 - (x + ch_width) / 2 + x;
break;
case ALIGN_R:
xcb_copy_area (c, canvas, canvas, draw_gc, screen->width - x + screen->x, 0,
screen->width - x - ch_width + screen->x, 0, x, BAR_HEIGHT);
x = screen->width - ch_width;
break;
}
/* Draw the background first */
xcb_fill_rect (clear_gc, x + screen->x, 0, ch_width, BAR_HEIGHT);
/* xcb accepts string in UCS-2 BE, so swap */
ch = (ch >> 8) | (ch << 8);
/* String baseline coordinates */
xcb_image_text_16 (c, 1, canvas, draw_gc, x + screen->x, BAR_HEIGHT / 2 + sel_font->avg_height / 2 - sel_font->descent,
(xcb_char2b_t *)&ch);
/* Draw the underline */
if (BAR_UNDERLINE_HEIGHT)
xcb_fill_rect (underl_gc, x + screen->x, BAR_UNDERLINE*(BAR_HEIGHT-BAR_UNDERLINE_HEIGHT), ch_width, BAR_UNDERLINE_HEIGHT);
return ch_width;
}
void
parse (char *text)
{
char *p = text;
int pos_x = 0;
int align = 0;
screen_t *screen = &screens[0];
xcb_fill_rect (clear_gc, 0, 0, bar_width, BAR_HEIGHT);
for (;;) {
if (*p == '\0' || *p == '\n')
return;
if (*p == '\\' && p++ && *p != '\\' && strchr (control_characters, *p)) {
switch (*p++) {
case 'f':
xcb_set_fg (isdigit(*p) ? *p-'0' : 11);
p++;
break;
case 'b':
xcb_set_bg (isdigit(*p) ? *p-'0' : 10);
p++;
break;
case 'u':
xcb_set_ud (isdigit(*p) ? *p-'0' : 10);
p++;
break;
#if XINERAMA
case 's':
if (*p == 'r') {
screen = &screens[num_screens - 1];
} else if (*p == 'l') {
screen = &screens[0];
} else if (*p == 'n') {
if (screen == &screens[num_screens - 1])
break;
screen++;
} else if (*p == 'p') {
if (screen == screens)
break;
screen--;
} else if (isdigit(*p)) {
int index = *p-'0';
if (index < num_screens) {
screen = &screens[index];
} else {
break;
}
} else {
break;
}
align = ALIGN_L;
pos_x = 0;
p++;
break;
#endif
case 'l':
align = ALIGN_L;
pos_x = 0;
break;
case 'c':
align = ALIGN_C;
pos_x = 0;
break;
case 'r':
align = ALIGN_R;
pos_x = 0;
break;
}
} else { /* utf-8 -> ucs-2 */
uint8_t *utf = (uint8_t *)p;
uint16_t ucs;
if (utf[0] < 0x80) {
ucs = utf[0];
p += 1;
}
else if ((utf[0] & 0xe0) == 0xc0) {
ucs = (utf[0] & 0x1f) << 6 | (utf[1] & 0x3f);
p += 2;
}
else if ((utf[0] & 0xf0) == 0xe0) {
ucs = (utf[0] & 0xf) << 12 | (utf[1] & 0x3f) << 6 | (utf[2] & 0x3f);
p += 3;
}
else { /* Handle ascii > 0x80 */
ucs = utf[0];
p += 1;
}
/* The character is outside the main font charset, use the fallback */
if (ucs < fontset[FONT_MAIN].char_min || ucs > fontset[FONT_MAIN].char_max)
xcb_set_fontset (FONT_FALLBACK);
else
xcb_set_fontset (FONT_MAIN);
pos_x += draw_char (screen, pos_x, align, ucs);
}
}
}
int
font_load (const char **font_list)
{
xcb_query_font_cookie_t queryreq;
xcb_query_font_reply_t *font_info;
xcb_void_cookie_t cookie;
xcb_font_t font;
int max_height;
max_height = -1;
for (int i = 0; i < FONT_MAX; i++) {
font = xcb_generate_id (c);
cookie = xcb_open_font_checked (c, font, strlen (font_list[i]), font_list[i]);
if (xcb_request_check (c, cookie)) {
fprintf (stderr, "Could not load font %s\n", font_list[i]);
return 1;
}
queryreq = xcb_query_font (c, font);
font_info = xcb_query_font_reply (c, queryreq, NULL);
fontset[i].xcb_ft = font;
fontset[i].table = xcb_query_font_char_infos (font_info);
fontset[i].descent = font_info->font_descent;
fontset[i].char_max= font_info->max_byte1 << 8 | font_info->max_char_or_byte2;
fontset[i].char_min= font_info->min_byte1 << 8 | font_info->min_char_or_byte2;
max_height = MAX(font_info->font_ascent + font_info->font_descent, max_height);
}
/* To have an uniform alignment */
for (int i = 0; i < FONT_MAX; i++)
fontset[i].avg_height = max_height;
return 0;
}
enum {
NET_WM_WINDOW_TYPE,
NET_WM_WINDOW_TYPE_DOCK,
NET_WM_DESKTOP,
NET_WM_STRUT_PARTIAL,
NET_WM_STRUT,
NET_WM_STATE,
NET_WM_WINDOW_OPACITY,
NET_WM_STATE_STICKY,
NET_WM_STATE_ABOVE,
};
void
set_ewmh_atoms (void)
{
const char *atom_names[] = {
"_NET_WM_WINDOW_TYPE",
"_NET_WM_WINDOW_TYPE_DOCK",
"_NET_WM_DESKTOP",
"_NET_WM_STRUT_PARTIAL",
"_NET_WM_STRUT",
"_NET_WM_STATE",
"_NET_WM_WINDOW_OPACITY",
/* Leave those at the end since are batch-set */
"_NET_WM_STATE_STICKY",
"_NET_WM_STATE_ABOVE",
};
const int atoms = sizeof(atom_names)/sizeof(char *);
xcb_intern_atom_cookie_t atom_cookie[atoms];
xcb_atom_t atom_list[atoms];
xcb_intern_atom_reply_t *atom_reply;
/* As suggested fetch all the cookies first (yum!) and then retrieve the
* atoms to exploit the async'ness */
for (int i = 0; i < atoms; i++)
atom_cookie[i] = xcb_intern_atom(c, 0, strlen(atom_names[i]), atom_names[i]);
for (int i = 0; i < atoms; i++) {
atom_reply = xcb_intern_atom_reply(c, atom_cookie[i], NULL);
if (!atom_reply)
return;
atom_list[i] = atom_reply->atom;
free(atom_reply);
}
/* Prepare the strut array */
for (screen_t *cur_screen = screens; cur_screen < screens+num_screens; cur_screen++) {
int strut[12] = {0};
if (bar_bottom) {
strut[3] = BAR_HEIGHT;
strut[10] = cur_screen->x;
strut[11] = cur_screen->x + cur_screen->width;
} else {
strut[2] = BAR_HEIGHT;
strut[8] = cur_screen->x;
strut[9] = cur_screen->x + cur_screen->width;
}
xcb_change_property (c, XCB_PROP_MODE_REPLACE, cur_screen->window, atom_list[NET_WM_WINDOW_OPACITY], XCB_ATOM_CARDINAL, 32, 1, (const uint32_t []){ (uint32_t)(BAR_OPACITY * 0xffffffff) } );
xcb_change_property (c, XCB_PROP_MODE_REPLACE, cur_screen->window, atom_list[NET_WM_WINDOW_TYPE], XCB_ATOM_ATOM, 32, 1, &atom_list[NET_WM_WINDOW_TYPE_DOCK]);
xcb_change_property (c, XCB_PROP_MODE_APPEND, cur_screen->window, atom_list[NET_WM_STATE], XCB_ATOM_ATOM, 32, 2, &atom_list[NET_WM_STATE_STICKY]);
xcb_change_property (c, XCB_PROP_MODE_REPLACE, cur_screen->window, atom_list[NET_WM_DESKTOP], XCB_ATOM_CARDINAL, 32, 1, (const uint32_t []){ -1 } );
xcb_change_property (c, XCB_PROP_MODE_REPLACE, cur_screen->window, atom_list[NET_WM_STRUT_PARTIAL], XCB_ATOM_CARDINAL, 32, 12, strut);
xcb_change_property (c, XCB_PROP_MODE_REPLACE, cur_screen->window, atom_list[NET_WM_STRUT], XCB_ATOM_CARDINAL, 32, 4, strut);
}
}
xcb_window_t
create_window(xcb_window_t root, int x, int y, int width, int height, xcb_visualid_t visual) {
xcb_window_t window = xcb_generate_id(c);
xcb_create_window(c, XCB_COPY_FROM_PARENT, window, root, x, y, width, height, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT, visual, XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK, (const uint32_t []){ palette[10], XCB_EVENT_MASK_EXPOSURE });
xcb_change_window_attributes (c, window, XCB_CW_OVERRIDE_REDIRECT, (const uint32_t []){ force_docking });
return window;
}
void
init (void)
{
xcb_screen_t *scr;
xcb_window_t root;
screen_t *cur_screen;
#if XINERAMA
xcb_generic_error_t* err = NULL;
xcb_xinerama_query_screens_reply_t *xinerama_reply;
xcb_xinerama_query_screens_cookie_t xinerama_query;
xcb_xinerama_screen_info_iterator_t xinerama_iter;
#endif
/* Connect to X */
c = xcb_connect (NULL, NULL);
if (xcb_connection_has_error (c)) {
fprintf (stderr, "Couldn't connect to X\n");
exit (1);
}
/* Grab infos from the first screen */
scr = xcb_setup_roots_iterator (xcb_get_setup (c)).data;
root = scr->root;
/* where to place the window */
bar_width = (BAR_WIDTH < 0) ? (scr->width_in_pixels - BAR_OFFSET) : BAR_WIDTH;
/* Load the font */
if (font_load ((const char* []){ BAR_FONT }))
exit (1);
/* Generate a list of screens */
#if XINERAMA
xinerama_query = xcb_xinerama_query_screens_unchecked (c);
xinerama_reply = xcb_xinerama_query_screens_reply (c, xinerama_query, &err);
if (err != NULL || xinerama_reply == NULL)
exit (1);
xinerama_iter = xcb_xinerama_query_screens_screen_info_iterator (xinerama_reply);
num_screens = xinerama_iter.rem;
screens = calloc (num_screens, sizeof(screen_t));
if (screens == NULL)
exit (1);
/* Add BAR_OFFSET to the last screen */
int right_bar_offset = scr->width_in_pixels - bar_width - BAR_OFFSET;
for (cur_screen = &screens[num_screens-1]; cur_screen >= screens; xcb_xinerama_screen_info_next (&xinerama_iter), cur_screen--) {
cur_screen->width = xinerama_iter.data->width;
if (right_bar_offset > 0) {
if (right_bar_offset >= cur_screen->width) {
/* Remove the screen */
num_screens--;
right_bar_offset -= cur_screen->width;
} else {
cur_screen->width -= right_bar_offset;
right_bar_offset = 0;
}
}
cur_screen->x = xinerama_iter.data->x_org - BAR_OFFSET;
/* Create the main window */
int y = ( bar_bottom ? ( xinerama_iter.data->height - BAR_HEIGHT ) : 0 ) + xinerama_iter.data->y_org;
cur_screen->window = create_window( root, cur_screen->x, y, cur_screen->width, BAR_HEIGHT, scr->root_visual );
if (cur_screen->x < 0) {
/* First screen */
cur_screen->x = 0;
break;
}
}
free(xinerama_reply);
/* Remove BAR_OFFSET from the first screen */
cur_screen->width -= BAR_OFFSET;
/* Shift */
if (cur_screen > screens)
memmove (screens, cur_screen, sizeof(screen_t) * num_screens);
/* Reallocate */
screens = realloc (screens, num_screens);
if (screens == NULL)
exit (1);
#else
num_screens = 1;
screens = calloc(1, sizeof(screen_t));
/* Take into account the offset */
screens[0].x = BAR_OFFSET;
screens[0].width = bar_width - BAR_OFFSET;
/* Create the main window */
int y = bar_bottom ? (scr->height_in_pixels - BAR_HEIGHT) : 0;
screens->window = create_window( root, screens->x, y, screens->width, BAR_HEIGHT, scr->root_visual );
#endif
/* For WM that support EWMH atoms */
set_ewmh_atoms();
/* Create a temporary canvas */
canvas = xcb_generate_id (c);
xcb_create_pixmap (c, scr->root_depth, canvas, root, bar_width, BAR_HEIGHT);
/* Create the gc for drawing */
draw_gc = xcb_generate_id (c);
xcb_create_gc (c, draw_gc, root, XCB_GC_FOREGROUND | XCB_GC_BACKGROUND, (const uint32_t []){ palette[11], palette[10] });
clear_gc = xcb_generate_id (c);
xcb_create_gc (c, clear_gc, root, XCB_GC_FOREGROUND, (const uint32_t []){ palette[10] });
underl_gc = xcb_generate_id (c);
xcb_create_gc (c, underl_gc, root, XCB_GC_FOREGROUND, (const uint32_t []){ palette[10] });
/* Make the bar visible */
for(cur_screen = screens; cur_screen < screens + num_screens; cur_screen++) {
xcb_map_window (c, cur_screen->window);
}
xcb_flush (c);
}
void
cleanup (void)
{
int i;
for (i = 0; i < FONT_MAX; i++) {
if (fontset[i].xcb_ft)
xcb_close_font (c, fontset[i].xcb_ft);
}
if (screens) {
for(screen_t *cur_screen = screens; cur_screen < screens + num_screens; cur_screen++) {
xcb_destroy_window( c, cur_screen->window );
}
free (screens);
}
if (canvas)
xcb_free_pixmap (c, canvas);
if (draw_gc)
xcb_free_gc (c, draw_gc);
if (clear_gc)
xcb_free_gc (c, clear_gc);
if (underl_gc)
xcb_free_gc (c, underl_gc);
if (c)
xcb_disconnect (c);
}
void
sighandle (int signal)
{
if (signal == SIGINT || signal == SIGTERM)
exit (0);
}
int
main (int argc, char **argv)
{
char input[1024] = {0, };
struct pollfd pollin[2] = {
{ .fd = STDIN_FILENO, .events = POLLIN },
{ .fd = -1 , .events = POLLIN },
};
xcb_generic_event_t *ev;
xcb_expose_event_t *expose_ev;
int permanent = 0;
char ch;
while ((ch = getopt (argc, argv, "phbf")) != -1) {
switch (ch) {
case 'h':
printf ("usage: %s [-p | -h] [-b]\n"
"\t-h Show this help\n"
"\t-b Put bar at the bottom of the screen\n"
"\t-f Force docking (use this if your WM isn't EWMH compliant)\n"
"\t-p Don't close after the data ends\n", argv[0]);
exit (0);
case 'p': permanent = 1; break;
case 'b': bar_bottom = 1; break;
case 'f': force_docking = 1; break;
}
}
atexit (cleanup);
signal (SIGINT, sighandle);
signal (SIGTERM, sighandle);
init ();
/* Get the fd to Xserver */
pollin[1].fd = xcb_get_file_descriptor (c);
xcb_fill_rect (clear_gc, 0, 0, bar_width, BAR_HEIGHT);
for (;;) {
int redraw = 0;
if (poll (pollin, 2, -1) > 0) {
if (pollin[0].revents & POLLHUP) { /* No more data... */
if (permanent) pollin[0].fd = -1; /* ...null the fd and continue polling :D */
else break; /* ...bail out */
}
if (pollin[0].revents & POLLIN) { /* New input, process it */
if (fgets (input, sizeof(input), stdin) == NULL)
break; /* EOF received */
parse (input);
redraw = 1;
}
if (pollin[1].revents & POLLIN) { /* Xserver broadcasted an event */
while ((ev = xcb_poll_for_event (c))) {
expose_ev = (xcb_expose_event_t *)ev;
switch (ev->response_type & 0x7F) {
case XCB_EXPOSE:
if (expose_ev->count == 0) redraw = 1;
break;
}
free (ev);
}
}
}
if (redraw) /* Copy our temporary pixmap onto the window */
for (screen_t* cur_screen = screens; cur_screen < screens + num_screens; cur_screen++)
xcb_copy_area (c, canvas, cur_screen->window, draw_gc, cur_screen->x, 0, 0, 0, cur_screen->width, BAR_HEIGHT);
xcb_flush (c);
}
return 0;
}
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