Added build instructions and allowed selection of which tests to run

Makefile

@@ -27,9 +27,14 @@ BUILD       ?= $(PROGS)
 EXES        := \
   $(filter $(BUILD),$(filter-out $(DONT_BUILD),$(PROGS)))
 
-TESTS       := \
+# Programs with usable tests
+TEST_PROGS  := \
   cat \
 
+TEST        ?= $(TEST_PROGS)
+
+TESTS       := \
+  $(filter $(TEST),$(filter-out $(DONT_TEST),$(filter $(BUILD),$(filter-out $(DONT_BUILD),$(TEST_PROGS)))))
 
 # Utils stuff
 EXES_PATHS  := $(addprefix build/,$(EXES))

README.md

@@ -16,6 +16,42 @@ are either old, abandonned, hosted on CVS, written in platform-specific C, etc.
 Rust provides a good platform-agnostic way of writing systems utils that are easy
 to compile anywhere, and this is as good a way as any to try and learn it.
 
+Build Instructions
+------------------
+
+To simply build all available utilities:
+```
+make
+```
+
+To build all but a few of the available utilities:
+```
+make DONT_BUILD='UTILITY_1 UTILITY_2'
+```
+
+To build only a few of the available utilities:
+```
+make BUILD='UTILITY_1 UTILITY_2'
+```
+
+Test Instructions
+-----------------
+
+To simply test all available utilities:
+```
+make test
+```
+
+To test all but a few of the available utilities:
+```
+make DONT_TEST='UTILITY_1 UTILITY_2' test
+```
+
+To test only a few of the available utilities:
+```
+make TEST='UTILITY_1 UTILITY_2' test
+```
+
 Contribute
 ----------