makefile: add PREFIX and ensure_bin target

- add build/install instructions

.gitignore

@@ -52,3 +52,4 @@ Module.symvers
 Mkfile.old
 dkms.conf
 
+bin/

Makefile

@@ -0,0 +1,37 @@
+.POSIX:
+.SUFFIXES:
+
+CC=cc
+CFLAGS=-W -O
+
+LDFLAGS=
+LDLIBS=
+
+PREFIX=/usr/local
+
+all: ensure_bin journal
+
+ensure_bin: bin
+	mkdir -p bin
+
+install: journal
+	mkdir -p $(DESTDIR)$(PREFIX)/bin
+	cp -f bin/journal $(DESTDIR)$(PREFIX)/bin
+
+uninstall:
+	rm $(DESTDIR)$(PREFIX)/bin/journal
+
+# currently we only have one journal util, others may come later
+journal: src/journal/main.o
+	$(CC) $(LDFLAGS) -o bin/journal src/journal/main.o $(LDLIBS)
+
+src/journal/main.o: src/journal/main.c
+
+clean:
+	rm bin/journal src/journal/*.o
+
+.SUFFIXES: .c .o
+.c.o:
+	# $< mean the prereqs
+	# $@ means the target
+	$(CC) $(CFLAGS) -c $< -o $@

README.md

@@ -1,3 +1,16 @@
 # lunabot
 
-journal-like util for me
+journal-like util for me
+
+## building
+
+ - a robot girl
+ - posix compliant make
+ - gcc/any cc
+
+```
+make
+
+# or just remove PREFIX for /usr/local
+make PREFIX=$HOME/.local install
+```

src/journal/main.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+    if(argc < 2)
+    {
+        printf("usage: %s topic message\n", argv[0]);
+        return 0;
+    }
+
+    char *topic = argv[1];
+    printf("%s\n", topic);
+    return 0;
+}
+