Here we go.
This commit is contained in:
LemonBoy
commit
fbaf85f480
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CC ?= gcc
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STRIP ?= strip
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CFLAGS ?= -Os
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LDFLAGS += -lxcb
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CFDEBUG = -g3 -pedantic -Wall -Wunused-parameter -Wlong-long\
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-Wsign-conversion -Wconversion -Wimplicit-function-declaration
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EXEC = bar
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SRCS = bar.c
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OBJS = ${SRCS:.c=.o}
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PREFIX?=/usr
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BINDIR=${PREFIX}/bin
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all: ${EXEC}
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.c.o:
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${CC} ${CFLAGS} -o $@ -c $<
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${EXEC}: ${OBJS}
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${CC} ${LDFLAGS} -o ${EXEC} ${OBJS}
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${STRIP} -s ${EXEC}
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debug: ${EXEC}
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debug: CC += ${CFDEBUG}
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clean:
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rm -rf ./*.o
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rm -rf ./${EXEC}
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install: bar
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test -d ${DESTDIR}${BINDIR} || mkdir -p ${DESTDIR}${BINDIR}
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install -m755 bar ${DESTDIR}${BINDIR}/bar
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.PHONY: all debug clean install
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b(ar) a(in't) r(ecursive)
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=========================
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2012 (C) The Lemon Man
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A lightweight bar based on XCB (yay). Provides foreground/background color
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switching along with text alignment (screw you dzen!), nothing less and
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nothing more.
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Configuration
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-------------
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Change the config.h file and you're good to go!
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The text background and foreground are respectively the first and the second
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entries in the palette (COLOR0 and COLOR1).
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Text formatting
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---------------
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All the format commands are preceded by a backslash (\\).
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To draw a backslash just backslash escape it (\\\\).
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```
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f<0-9> Selects the text foreground color from the palette.
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b<0-9> Selects the text background color from the palette.
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l Aligns the text to the left.
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c Aligns the text to the center.
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r Aligns the text to the right.
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```
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <poll.h>
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#include <signal.h>
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#include <xcb/xcb.h>
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#include "config.h"
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// Here be dragons
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static xcb_connection_t *c;
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static int ft_height, ft_width;
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static xcb_window_t root, win;
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static xcb_gcontext_t gc;
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static int bw, bh;
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static const int pal[] = {COLOR0,COLOR1,COLOR2,COLOR3,COLOR4,COLOR5,COLOR6,COLOR7,COLOR8,COLOR9};
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#define MIN(a,b) ((a > b ? b : a))
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int
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draw (int x, int align, char *text)
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{
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int done = 0;
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int pos_x = x;
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int len = MIN(bw / ft_width, strlen (text));
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int strw = len * ft_width;
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if (!strw) return x;
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switch (align) {
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case 1:
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xcb_copy_area (c, win, win, gc, bw / 2 - pos_x / 2, 0, bw / 2 - (pos_x + strw) / 2, 0, pos_x, BAR_HEIGHT);
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pos_x = bw / 2 - (pos_x + strw) / 2 + pos_x;
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break;
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case 2:
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xcb_copy_area (c, win, win, gc, bw - pos_x, 0, bw - pos_x - strw, 0, pos_x, BAR_HEIGHT);
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pos_x = bw - strw;
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break;
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}
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do {
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xcb_image_text_8 (c, MIN(len - done, 255), win, gc, pos_x, bh - ft_height / 2, text + done); /* Bottom-left coords */
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done += MIN(len - done, 255);
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pos_x = done * ft_width;
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} while (done < len);
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return pos_x;
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}
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void
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parse (char *text)
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{
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char parsed_text[1000] = {0, };
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char *p = text;
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char *q = parsed_text;
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int pos_x = 0;
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int align = 0;
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xcb_clear_area (c, 0, win, 0, 0, bw, BAR_HEIGHT);
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for (;;) {
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if (*p == 0x0 || *p == 0xA || (*p == '\\' && p++ && *p != '\\' && strchr ("fblcr", *p))) {
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pos_x += draw (pos_x, align, parsed_text);
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switch (*p++) {
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case 0x0: return; /* EOL */
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case 0xA: return; /* NL */
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case 'f': if (isdigit (*p)) xcb_change_gc (c, gc, XCB_GC_FOREGROUND, (const uint32_t []){ pal[*p-'0'] }); p++; break;
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case 'b': if (isdigit (*p)) xcb_change_gc (c, gc, XCB_GC_BACKGROUND, (const uint32_t []){ pal[*p-'0'] }); p++; break;
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case 'l': align = 0; pos_x = 0; break;
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case 'c': align = 1; pos_x = 0; break;
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case 'r': align = 2; pos_x = 0; break;
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}
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q = parsed_text;
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}
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else *q++ = *p++;
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*q = 0;
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}
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}
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void
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cleanup (void)
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{
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xcb_destroy_window (c, win);
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xcb_free_gc (c, gc);
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xcb_disconnect (c);
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}
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void
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sighandle (int signal)
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{
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if (signal == SIGINT || signal == SIGTERM)
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exit (0);
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}
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void
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init (void)
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{
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xcb_font_t xf;
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xcb_screen_t *scr;
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xcb_query_font_reply_t *ft_info;
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/* Connect to X */
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c = xcb_connect (NULL, NULL);
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if (xcb_connection_has_error (c)) {
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fprintf (stderr, "Couldn't connect to X\n");
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exit (1);
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}
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/* Grab infos from the first screen */
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scr = xcb_setup_roots_iterator (xcb_get_setup (c)).data;
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bw = scr->width_in_pixels;
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bh = BAR_HEIGHT;
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root = scr->root;
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/* Load the font */
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xf = xcb_generate_id (c);
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if (xcb_request_check (c, xcb_open_font_checked (c, xf, strlen(BAR_FONT), BAR_FONT))) {
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fprintf (stderr, "Couldn't load the font\n");
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exit (1);
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}
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/* Grab infos from the font */
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ft_info = xcb_query_font_reply (c, xcb_query_font (c, xf), NULL);
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ft_height = ft_info->font_ascent + ft_info->font_descent;
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ft_width = ft_info->max_bounds.character_width;
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/* Create the main window */
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win = xcb_generate_id (c);
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xcb_create_window (c, XCB_COPY_FROM_PARENT, win, root, 0, 0, bw, bh, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT,
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scr->root_visual, XCB_CW_BACK_PIXEL | XCB_CW_OVERRIDE_REDIRECT,
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(const uint32_t []){ pal[0], 1 });
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/* Create the gc for drawing */
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gc = xcb_generate_id (c);
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xcb_create_gc (c, gc, root, XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT,
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(const uint32_t []){ pal[1], pal[0], xf });
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/* Get rid of the font */
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xcb_close_font (c, xf);
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/* Make the bar visible */
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xcb_map_window (c, win);
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xcb_flush (c);
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}
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int
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main (void)
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{
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struct pollfd stdinpoll = { .fd = 0, .events = POLLIN | POLLHUP };
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static char input[1000] = {0, };
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atexit (cleanup);
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signal (SIGINT, sighandle);
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signal (SIGTERM, sighandle);
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init ();
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for (;;) {
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if (poll (&stdinpoll, 1, -1) > 0) {
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if (stdinpoll.revents & POLLHUP) break;
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if (stdinpoll.revents & POLLIN) {
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fgets (input, sizeof(input), stdin);
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parse (input);
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xcb_flush (c);
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}
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}
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}
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return 0;
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}
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@ -0,0 +1,13 @@
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#define BAR_HEIGHT 18
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#define BAR_FONT "-*-terminus-medium-r-normal-*-12-*-*-*-c-*-*-1"
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#define COLOR0 0x262729 /* background */
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#define COLOR1 0xebebeb /* foreground */
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#define COLOR2 0x262729
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#define COLOR3 0xf92671
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#define COLOR4 0xa6e22e
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#define COLOR5 0xfd971f
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#define COLOR6 0x34bdef
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#define COLOR7 0x9e6ffe
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#define COLOR8 0x5e7175
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#define COLOR9 0xccccc6
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