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Here we go.

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LemonBoy 2012-07-16 11:41:34 +02:00
commit fbaf85f480
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35
Makefile Normal file
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CC ?= gcc
STRIP ?= strip
CFLAGS ?= -Os
LDFLAGS += -lxcb
CFDEBUG = -g3 -pedantic -Wall -Wunused-parameter -Wlong-long\
-Wsign-conversion -Wconversion -Wimplicit-function-declaration
EXEC = bar
SRCS = bar.c
OBJS = ${SRCS:.c=.o}
PREFIX?=/usr
BINDIR=${PREFIX}/bin
all: ${EXEC}
.c.o:
${CC} ${CFLAGS} -o $@ -c $<
${EXEC}: ${OBJS}
${CC} ${LDFLAGS} -o ${EXEC} ${OBJS}
${STRIP} -s ${EXEC}
debug: ${EXEC}
debug: CC += ${CFDEBUG}
clean:
rm -rf ./*.o
rm -rf ./${EXEC}
install: bar
test -d ${DESTDIR}${BINDIR} || mkdir -p ${DESTDIR}${BINDIR}
install -m755 bar ${DESTDIR}${BINDIR}/bar
.PHONY: all debug clean install

27
README.md Normal file
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b(ar) a(in't) r(ecursive)
=========================
2012 (C) The Lemon Man
A lightweight bar based on XCB (yay). Provides foreground/background color
switching along with text alignment (screw you dzen!), nothing less and
nothing more.
Configuration
-------------
Change the config.h file and you're good to go!
The text background and foreground are respectively the first and the second
entries in the palette (COLOR0 and COLOR1).
Text formatting
---------------
All the format commands are preceded by a backslash (\\).
To draw a backslash just backslash escape it (\\\\).
```
f<0-9> Selects the text foreground color from the palette.
b<0-9> Selects the text background color from the palette.
l Aligns the text to the left.
c Aligns the text to the center.
r Aligns the text to the right.
```

167
bar.c Normal file
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <poll.h>
#include <signal.h>
#include <xcb/xcb.h>
#include "config.h"
// Here be dragons
static xcb_connection_t *c;
static int ft_height, ft_width;
static xcb_window_t root, win;
static xcb_gcontext_t gc;
static int bw, bh;
static const int pal[] = {COLOR0,COLOR1,COLOR2,COLOR3,COLOR4,COLOR5,COLOR6,COLOR7,COLOR8,COLOR9};
#define MIN(a,b) ((a > b ? b : a))
int
draw (int x, int align, char *text)
{
int done = 0;
int pos_x = x;
int len = MIN(bw / ft_width, strlen (text));
int strw = len * ft_width;
if (!strw) return x;
switch (align) {
case 1:
xcb_copy_area (c, win, win, gc, bw / 2 - pos_x / 2, 0, bw / 2 - (pos_x + strw) / 2, 0, pos_x, BAR_HEIGHT);
pos_x = bw / 2 - (pos_x + strw) / 2 + pos_x;
break;
case 2:
xcb_copy_area (c, win, win, gc, bw - pos_x, 0, bw - pos_x - strw, 0, pos_x, BAR_HEIGHT);
pos_x = bw - strw;
break;
}
do {
xcb_image_text_8 (c, MIN(len - done, 255), win, gc, pos_x, bh - ft_height / 2, text + done); /* Bottom-left coords */
done += MIN(len - done, 255);
pos_x = done * ft_width;
} while (done < len);
return pos_x;
}
void
parse (char *text)
{
char parsed_text[1000] = {0, };
char *p = text;
char *q = parsed_text;
int pos_x = 0;
int align = 0;
xcb_clear_area (c, 0, win, 0, 0, bw, BAR_HEIGHT);
for (;;) {
if (*p == 0x0 || *p == 0xA || (*p == '\\' && p++ && *p != '\\' && strchr ("fblcr", *p))) {
pos_x += draw (pos_x, align, parsed_text);
switch (*p++) {
case 0x0: return; /* EOL */
case 0xA: return; /* NL */
case 'f': if (isdigit (*p)) xcb_change_gc (c, gc, XCB_GC_FOREGROUND, (const uint32_t []){ pal[*p-'0'] }); p++; break;
case 'b': if (isdigit (*p)) xcb_change_gc (c, gc, XCB_GC_BACKGROUND, (const uint32_t []){ pal[*p-'0'] }); p++; 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;
}
q = parsed_text;
}
else *q++ = *p++;
*q = 0;
}
}
void
cleanup (void)
{
xcb_destroy_window (c, win);
xcb_free_gc (c, gc);
xcb_disconnect (c);
}
void
sighandle (int signal)
{
if (signal == SIGINT || signal == SIGTERM)
exit (0);
}
void
init (void)
{
xcb_font_t xf;
xcb_screen_t *scr;
xcb_query_font_reply_t *ft_info;
/* 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;
bw = scr->width_in_pixels;
bh = BAR_HEIGHT;
root = scr->root;
/* Load the font */
xf = xcb_generate_id (c);
if (xcb_request_check (c, xcb_open_font_checked (c, xf, strlen(BAR_FONT), BAR_FONT))) {
fprintf (stderr, "Couldn't load the font\n");
exit (1);
}
/* Grab infos from the font */
ft_info = xcb_query_font_reply (c, xcb_query_font (c, xf), NULL);
ft_height = ft_info->font_ascent + ft_info->font_descent;
ft_width = ft_info->max_bounds.character_width;
/* Create the main window */
win = xcb_generate_id (c);
xcb_create_window (c, XCB_COPY_FROM_PARENT, win, root, 0, 0, bw, bh, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT,
scr->root_visual, XCB_CW_BACK_PIXEL | XCB_CW_OVERRIDE_REDIRECT,
(const uint32_t []){ pal[0], 1 });
/* Create the gc for drawing */
gc = xcb_generate_id (c);
xcb_create_gc (c, gc, root, XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT,
(const uint32_t []){ pal[1], pal[0], xf });
/* Get rid of the font */
xcb_close_font (c, xf);
/* Make the bar visible */
xcb_map_window (c, win);
xcb_flush (c);
}
int
main (void)
{
struct pollfd stdinpoll = { .fd = 0, .events = POLLIN | POLLHUP };
static char input[1000] = {0, };
atexit (cleanup);
signal (SIGINT, sighandle);
signal (SIGTERM, sighandle);
init ();
for (;;) {
if (poll (&stdinpoll, 1, -1) > 0) {
if (stdinpoll.revents & POLLHUP) break;
if (stdinpoll.revents & POLLIN) {
fgets (input, sizeof(input), stdin);
parse (input);
xcb_flush (c);
}
}
}
return 0;
}

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config.h Normal file
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#define BAR_HEIGHT 18
#define BAR_FONT "-*-terminus-medium-r-normal-*-12-*-*-*-c-*-*-1"
#define COLOR0 0x262729 /* background */
#define COLOR1 0xebebeb /* foreground */
#define COLOR2 0x262729
#define COLOR3 0xf92671
#define COLOR4 0xa6e22e
#define COLOR5 0xfd971f
#define COLOR6 0x34bdef
#define COLOR7 0x9e6ffe
#define COLOR8 0x5e7175
#define COLOR9 0xccccc6