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lemonbar/bar.c

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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>
#include "config.h"
// Here be dragons
#define MAX(a,b) ((a > b) ? a : b)
typedef struct fontset_item_t {
xcb_font_t xcb_ft;
int height;
int width;
int descent;
unsigned short char_max;
unsigned short char_min;
} fontset_item_t;
enum {
FONT_MAIN,
FONT_FALLBACK,
FONT_MAX
};
static xcb_connection_t *c;
static xcb_window_t win;
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 bool bar_bottom;
static fontset_item_t fontset[FONT_MAX];
static fontset_item_t *sel_font = &fontset[FONT_MAIN];
static const unsigned palette[] = {COLOR0,COLOR1,COLOR2,COLOR3,COLOR4,COLOR5,COLOR6,COLOR7,COLOR8,COLOR9};
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] });
xcb_change_gc (c, underl_gc, XCB_GC_FOREGROUND, (const unsigned []){ palette[i] });
}
void
xcb_set_fg (int i)
{
xcb_change_gc (c, draw_gc , XCB_GC_FOREGROUND, (const unsigned []){ palette[i] });
}
void
xcb_set_ud (int i)
{
xcb_change_gc (c, underl_gc, XCB_GC_FOREGROUND, (const unsigned []){ palette[i] });
}
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 } });
}
void
xcb_set_fontset (int i)
{
sel_font = &fontset[i&1];
xcb_change_gc (c, draw_gc , XCB_GC_FONT, (const unsigned []){ sel_font->xcb_ft });
}
int
draw_char (int x, int align, wchar_t ch)
{
switch (align) {
case 1:
xcb_copy_area (c, canvas, canvas, draw_gc, bar_width / 2 - x / 2, 0,
bar_width / 2 - (x + sel_font->width) / 2, 0, x, BAR_HEIGHT);
x = bar_width / 2 - (x + sel_font->width) / 2 + x;
break;
case 2:
xcb_copy_area (c, canvas, canvas, draw_gc, bar_width - x, 0,
bar_width - x - sel_font->width, 0, x, BAR_HEIGHT);
x = bar_width - sel_font->width;
break;
}
/* Draw the background first */
xcb_fill_rect (clear_gc, x, 0, sel_font->width, BAR_HEIGHT);
/* Draw the underline */
if (BAR_UNDERLINE_HEIGHT)
xcb_fill_rect (underl_gc, x, BAR_HEIGHT-BAR_UNDERLINE_HEIGHT, sel_font->width, BAR_UNDERLINE_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, BAR_HEIGHT / 2 + sel_font->height / 2 - sel_font->descent,
(xcb_char2b_t *)&ch);
return sel_font->width;
}
void
parse (char *text)
{
unsigned char *p = text;
int pos_x = 0;
int align = 0;
xcb_fill_rect (clear_gc, 0, 0, bar_width, BAR_HEIGHT);
for (;;) {
if (*p == '\0')
return;
if (*p == '\n')
return;
if (*p == '\\' && p++ && *p != '\\' && strchr ("fbulcr", *p)) {
switch (*p++) {
case 'f':
if (!isdigit (*p)) *p = '1';
xcb_set_fg ((*p++)-'0');
break;
case 'b':
if (!isdigit (*p)) *p = '0';
xcb_set_bg ((*p++)-'0');
break;
case 'u':
if (!isdigit (*p)) *p = '0';
xcb_set_ud ((*p++)-'0');
break;
case 'l':
align = 0;
pos_x = 0;
break;
case 'c':
align = 1;
pos_x = 0;
break;
case 'r':
align = 2;
pos_x = 0;
break;
}
} else { /* utf-8 -> ucs-2 */
wchar_t t;
if (!(p[0] & 0x80)) {
t = p[0];
p += 1;
}
else if ((p[0] & 0xe0) == 0xc0 && (p[1] & 0xc0) == 0x80) {
t = (p[0] & 0x1f) << 6 | p[1] & 0x3f;
p += 2;
}
else if ((p[0] & 0xf0) == 0xe0 && (p[1] & 0xc0) == 0x80 && (p[2] & 0xc0) == 0x80) {
t = (p[0] & 0xf) << 12 | (p[1] & 0x3f) << 6 | p[2] & 0x3f;
p += 3;
}
else { /* ASCII chars > 127 go in the extended latin range */
t = 0xc200 + p[0];
p += 1;
}
/* The character is outside the main font charset, use the fallback */
if (t < fontset[FONT_MAIN].char_min || t > fontset[FONT_MAIN].char_max)
xcb_set_fontset (FONT_FALLBACK);
else
xcb_set_fontset (FONT_MAIN);
pos_x += draw_char (pos_x, align, t);
}
}
}
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].width = font_info->max_bounds.character_width;
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);
free (font_info);
}
/* To have an uniform alignment */
for (int i = 0; i < FONT_MAX; i++)
fontset[i].height = max_height;
return 0;
}
int
set_ewmh_atoms (xcb_window_t root)
{
xcb_intern_atom_cookie_t cookies[5];
xcb_intern_atom_reply_t *reply;
xcb_get_property_reply_t *reply1;
xcb_atom_t atoms[5];
int compliance_lvl;
unsigned int v[12] = {0};
cookies[0] = xcb_intern_atom (c, 0, strlen ("_NET_WM_WINDOW_TYPE") , "_NET_WM_WINDOW_TYPE");
cookies[1] = xcb_intern_atom (c, 0, strlen ("_NET_WM_WINDOW_TYPE_DOCK"), "_NET_WM_WINDOW_TYPE_DOCK");
cookies[2] = xcb_intern_atom (c, 0, strlen ("_NET_WM_DESKTOP") , "_NET_WM_DESKTOP");
cookies[3] = xcb_intern_atom (c, 0, strlen ("_NET_WM_STRUT_PARTIAL") , "_NET_WM_STRUT_PARTIAL");
cookies[4] = xcb_intern_atom (c, 0, strlen ("_NET_SUPPORTED") , "_NET_SUPPORTED");
reply = xcb_intern_atom_reply (c, cookies[0], NULL);
atoms[0] = reply->atom; free (reply);
reply = xcb_intern_atom_reply (c, cookies[1], NULL);
atoms[1] = reply->atom; free (reply);
reply = xcb_intern_atom_reply (c, cookies[2], NULL);
atoms[2] = reply->atom; free (reply);
reply = xcb_intern_atom_reply (c, cookies[3], NULL);
atoms[3] = reply->atom; free (reply);
reply = xcb_intern_atom_reply (c, cookies[4], NULL);
atoms[4] = reply->atom; free (reply);
do {
reply1 = xcb_get_property_reply (c, xcb_get_property (c, 0, root, atoms[4], XCB_ATOM_ATOM, 0, -1), NULL);
} while (!xcb_get_property_value_length (reply1));
compliance_lvl = 0;
for (xcb_atom_t *a = xcb_get_property_value (reply1);
a && a != xcb_get_property_value_end (reply1).data;
a++)
{
/* Set the _NET_WM_WINDOW_TYPE_DOCK state */
if (*a == atoms[0]) {
xcb_change_property (c, XCB_PROP_MODE_REPLACE, win, atoms[0], XCB_ATOM_ATOM, 32, 1, &atoms[1]);
compliance_lvl++;
}
/* Show on every desktop */
if (*a == atoms[2]) {
xcb_change_property (c, XCB_PROP_MODE_REPLACE, win, atoms[2], XCB_ATOM_CARDINAL, 32, 1,
(const unsigned []){ 0xffffffff } );
compliance_lvl++;
}
/* Tell the WM that this space is for the bar */
if (*a == atoms[3]) {
if (bar_bottom) {
v[3] = BAR_HEIGHT;
v[11] = bar_width;
}
else {
v[2] = BAR_HEIGHT;
v[8] = bar_width;
}
xcb_change_property (c, XCB_PROP_MODE_REPLACE, win, atoms[3], XCB_ATOM_CARDINAL, 32, 12, v);
compliance_lvl++;
}
}
free (reply1);
/* If the wm supports at least 2 NET atoms then mark as compliant */
return (compliance_lvl > 1);
}
void
init (void)
{
xcb_screen_t *scr;
xcb_window_t root;
int y;
/* 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;
bar_width = scr->width_in_pixels;
root = scr->root;
/* Load the font */
if (font_load ((const char* []){ BAR_MAIN_FONT, BAR_FALLBACK_FONT }))
exit (1);
/* Create the main window */
win = xcb_generate_id (c);
if (bar_bottom)
y = scr->height_in_pixels - BAR_HEIGHT;
else
y = 0;
xcb_create_window (c, XCB_COPY_FROM_PARENT, win, root, 0, y,
bar_width, BAR_HEIGHT, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT, scr->root_visual,
XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK, (const unsigned []){ palette[0], XCB_EVENT_MASK_EXPOSURE });
/* Set EWMH hints */
int ewmh_docking = set_ewmh_atoms (root);
/* Quirk for wm not supporting the EWMH docking method */
xcb_change_window_attributes (c, win, XCB_CW_OVERRIDE_REDIRECT, (const unsigned []){ !ewmh_docking });
/* 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 unsigned []){ palette[1], palette[0] });
clear_gc = xcb_generate_id (c);
xcb_create_gc (c, clear_gc, root, XCB_GC_FOREGROUND, (const unsigned []){ palette[0] });
underl_gc = xcb_generate_id (c);
xcb_create_gc (c, underl_gc, root, XCB_GC_FOREGROUND, (const unsigned []){ palette[0] });
/* Make the bar visible */
xcb_map_window (c, win);
xcb_flush (c);
}
void
cleanup (void)
{
xcb_close_font (c, fontset[FONT_MAIN].xcb_ft);
xcb_close_font (c, fontset[FONT_FALLBACK].xcb_ft);
xcb_free_pixmap (c, canvas);
xcb_destroy_window (c, win);
xcb_free_gc (c, draw_gc);
xcb_free_gc (c, clear_gc);
xcb_free_gc (c, underl_gc);
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, "phb")) != -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-p Don't close after the data ends\n", argv[0]);
exit (0);
case 'p': permanent = 1; break;
case 'b': bar_bottom = 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 ((struct pollfd *)&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 */
fgets (input, sizeof(input), stdin);
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 */
xcb_copy_area (c, canvas, win, draw_gc, 0, 0, 0, 0, bar_width, BAR_HEIGHT);
xcb_flush (c);
}
return 0;
}
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