Initial version of dwmst.

.gitignore

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+dwmst

Makefile

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+all:
+	gcc -o dwmst -lX11 dwmst.c
+
+clean:
+	rm -f dwmst

dwmst.c

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+#include <unistd.h>
+#include <stdio.h>
+#include <X11/Xlib.h>
+#include <time.h>
+#include <string.h>
+
+#define INTERVAL 10
+
+int main(void) {
+  Display *display = XOpenDisplay(NULL);
+  if (display == NULL) {
+    fprintf(stderr, "dwmst: cannot open display.\n");
+  }
+
+  /* time */
+  char tbuffer[128] = { 0 };
+  time_t currentTime;
+  struct tm *timeinfo;
+
+  /* battery */
+  char bbuffer[6] = { 0 };
+  FILE *f;
+
+  /* status */
+  char status[256] = { 0 };
+
+  for (;;sleep(INTERVAL)) {
+    /* get current time */
+    time(&currentTime);
+    timeinfo = localtime(&currentTime);
+    
+    strftime(tbuffer, sizeof(tbuffer), "%a %b %d %H:%M", timeinfo);
+
+    /* battery status */
+    f = fopen("/sys/class/power_supply/BAT0/capacity", "r");
+    if (f == NULL) {
+      fprintf(stderr, "dwmst: cannot access battery.\n");
+    } else {
+      fgets(bbuffer, 4, f);
+      strtok(bbuffer, "\n"); /* remove trailing white space */
+      strcat(bbuffer, "%");
+    }
+    fclose(f);
+
+    f = fopen("/sys/class/power_supply/BAT0/status", "r");
+    if (f == NULL) {
+      fprintf(stderr, "dwmst: cannot access battery.\n");
+    } else {
+      switch(getc(f)) {
+      case 'D': /* Discharging */
+	strcat(bbuffer, "-");
+	break;
+      case 'C': /* Charging */
+	strcat(bbuffer, "+");
+	break;
+      case 'F': /* Full */
+	strcat(bbuffer, "=");
+      }
+    }
+    fclose(f);
+
+    /* build status */
+    sprintf(status, "%s | %s", tbuffer, bbuffer);
+
+    /* store root window name */
+    XStoreName(display, DefaultRootWindow(display), status);
+    XSync(display, False);
+  }
+}