Add initial version of i3-input, an interactive tool for sending IPC commands

i3-input/Makefile

@@ -0,0 +1,28 @@
+# Default value so one can compile i3-input standalone
+TOPDIR=..
+
+include $(TOPDIR)/common.mk
+
+# Depend on the object files of all source-files in src/*.c and on all header files
+FILES=$(patsubst %.c,%.o,$(wildcard *.c))
+HEADERS=$(wildcard *.h)
+
+# Depend on the specific file (.c for each .o) and on all headers
+%.o: %.c ${HEADERS}
+	echo "CC $<"
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+all: ${FILES}
+	echo "LINK i3-input"
+	$(CC) -o i3-input ${FILES} $(LDFLAGS)
+
+install: all
+	echo "INSTALL"
+	$(INSTALL) -d -m 0755 $(DESTDIR)/usr/bin
+	$(INSTALL) -m 0755 i3-input $(DESTDIR)/usr/bin/
+
+clean:
+	rm -f *.o
+
+distclean: clean
+	rm -f i3-input