add kwm window manager (river+kwm), remove old river config

lupan-clock/stdout-clock.c

@@ -0,0 +1,32 @@
+#include <X11/Xlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <unistd.h>
+#include <string.h>
+
+void show(struct tm *tm)
+{
+	char s[6];
+	strftime(s, sizeof(s), "%H:%M", tm);
+	printf("%s\n", s);
+	fflush(stdout);
+}
+
+int main() {
+	int h, m, init = 60;
+	time_t t;
+	struct tm *tm;
+
+	while (1) {
+		t = time(NULL);
+		tm = localtime(&t);
+		if (tm->tm_hour != h || tm->tm_min != m || init > 0) {
+			show(tm);
+			h = tm->tm_hour;
+			m = tm->tm_min;
+			init = (init > 0) ? init - 1 : 0;
+		}
+		sleep(1);
+	}
+	return 1;
+}