initial commitment

makefile

@@ -0,0 +1,21 @@
+CFLAGS = -Wall -Werror -pedantic -Ofast -std=c99
+LDFLAGS = -L/usr/X11R6/lib -lX11
+CC = gcc
+PREFIX = /usr/local
+MANPREFIX = ${PREFIX}/share/man
+
+status: status.c
+
+debug: status.c
+	${CC} ${LDFLAGS} -O0 -g -o stat_debug $?
+
+install: status
+	mkdir -p ${DESTDIR}${PREFIX}/bin
+	cp -f status ${DESTDIR}${PREFIX}/bin/status
+	chmod 755 ${DESTDIR}${PREFIX}/bin/status
+
+uninstall:
+	rm -f ${DESTDIR}${PREFIX}/bin/status
+
+clean:
+	rm -f status stat_debug

status.c

@@ -0,0 +1,169 @@
+#define _POSIX_C_SOURCE 200809L
+#define _DEFAULT_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <X11/Xlib.h>
+
+#define ELEMENT_NUMBER 2
+#define CHARS 64
+#define SEPARATOR " | "
+#define BAR_LENGTH (CHARS - (ELEMENT_NUMBER - 1) * sizeof(SEPARATOR))
+#define ELEMENT_SIZE (BAR_LENGTH / ELEMENT_NUMBER)
+/* ANSI colors escape codes */
+#define ANSI_COLOR_RED     "\x1b[31m"
+#define ANSI_COLOR_GREEN   "\x1b[32m"
+#define ANSI_COLOR_YELLOW  "\x1b[33m"
+#define ANSI_COLOR_BLUE    "\x1b[34m"
+#define ANSI_COLOR_MAGENTA "\x1b[35m"
+#define ANSI_COLOR_CYAN    "\x1b[36m"
+#define ANSI_COLOR_RESET   "\x1b[0m"
+
+const char bat_base_dir[] = "/sys/class/power_supply/";
+
+struct battery_descriptor {
+	int f_cap; /* Capacity file pointer */
+	int f_stat; /* Status file pointer */
+};
+
+static const char * get_date (void);
+static const char * get_battery (void);
+static void die (const char *, ...);
+
+int main (void)
+{
+	static int screen;
+	static Display *dpy = NULL;
+	static Window root;
+	static char bar[BAR_LENGTH] = {0};
+
+	dpy = XOpenDisplay(NULL);
+	if (!dpy)
+		die("cannot open default display");
+	screen = DefaultScreen(dpy);
+	root = RootWindow(dpy, screen);
+
+	// TODO: do not use sleep instead poll file desciptors for a change
+	for (;;sleep(10)) {
+		if (snprintf(bar, BAR_LENGTH, "%s" SEPARATOR "%s", get_battery(), get_date()) > BAR_LENGTH)
+			bar[BAR_LENGTH - 1] = '\0';
+
+		XStoreName(dpy, root, bar);
+		XSync(dpy, False);
+	}
+	
+	XCloseDisplay(dpy);
+	return 0;
+}
+
+static const char * get_date (void)
+{
+	static char str[ELEMENT_SIZE] = {0};
+	static time_t rawtime;
+	time(&rawtime);
+	strftime(str, ELEMENT_SIZE, "%a %d %b %H:%M", localtime(&rawtime));
+	return str;
+}
+
+static const char * get_battery (void) {
+	static char str[ELEMENT_SIZE] = {0};
+	static int init = 1;
+	static struct battery_descriptor *bat_arr = NULL;
+	static int bat_num = 0;
+	static char buf[sizeof(bat_base_dir) + 256 + 64];
+
+	if (init) {
+		DIR *bdir;
+		struct dirent *dent = NULL;
+		int tmpf;
+		
+		if (!(bdir = opendir(bat_base_dir)))
+			die("error opening %s", bat_base_dir);
+		while (1) {
+			errno = 0;
+			if (!(dent = readdir(bdir))) {
+				if (errno)
+					die("error reading %s", bat_base_dir);
+				else
+					break;
+			}
+		/*	if (dent->d_type != DT_DIR)
+				continue;*/
+			if (!strstr(dent->d_name, "BAT"))
+				continue;
+
+			bat_arr = realloc(bat_arr, sizeof(struct battery_descriptor) * ++bat_num);
+			if(!bat_arr)
+				die("bad realloc in get_battery");
+
+			strcpy(buf, bat_base_dir);
+			strcat(buf, dent->d_name);
+			strcat(buf, "/capacity");
+			if ((tmpf = open(buf, O_RDONLY | O_NONBLOCK)) < 0)
+				die("error opening %s", buf);
+			bat_arr[bat_num - 1].f_cap = tmpf;
+
+			strcpy(buf, bat_base_dir);
+			strcat(buf, dent->d_name);
+			strcat(buf, "/status");
+			if ((tmpf = open(buf, O_RDONLY | O_NONBLOCK)) < 0)
+				die("error opening %s", buf);
+			bat_arr[bat_num - 1].f_stat = tmpf;
+		}
+		closedir(bdir);
+		if (!bat_arr)
+			die("no batteries were found");
+		init = 0;
+	}
+	memset(str, 0, ELEMENT_SIZE);
+	int cap = 0;
+	int level = 0;
+	int barsize = 0;
+	int charging = 0;
+	for (int i = 0; i < bat_num; i++) {
+		memset(buf, 0, sizeof(bat_base_dir) + 256 + 64);
+		pread(bat_arr[i].f_cap, buf, 64, 0);
+		cap = atoi(buf);
+		barsize = (ELEMENT_SIZE / bat_num) - 5 - strlen(buf);
+		level = (cap / 100.0) * barsize;
+		pread(bat_arr[i].f_stat, buf, 64, 0);
+		charging = strstr(buf, "Dis") ? 0 : 1;
+
+		strcat(str, "[");
+		for (int i = 0; i < level; i++)
+			strcat(str, charging ? "+" : "=");
+		for (int i = 0; i < barsize - level; i++)
+			strcat(str, " ");
+		snprintf(buf, 64, "] %d%%", cap);
+		strcat(str, buf);
+	}
+	return str;
+}
+
+void die(const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+
+	fputs(ANSI_COLOR_RED, stderr);
+     	vfprintf(stderr, fmt, ap);
+
+	if (fmt[0] && fmt[strlen(fmt) - 1] == ':') {
+		fputc(' ', stderr);
+		perror(NULL);
+	} else {
+		fputc('\n', stderr);
+	}
+     	fputs(ANSI_COLOR_RESET, stderr);
+
+	va_end(ap);
+	exit(errno ? errno : 1);
+}