Have a single top-level main for running unit-tests

Instead of each .c file becoming a self-standing .t executable file,
and being run for executing the unit tests local to the file, now each
.c becomes a .to object (akin to a .o object, but one where the -DTEST
flag is given to the compiler).  After that, all the .to objects are
linked together in a gistatic-tests executable, in a equivalent way
that all .o files get linked together in a gistatic executable.

This change was necessary in order to allow dependencies between
objects.  The next task will be making a tar of a repository tree
checkout, and src/gistatic.{o,to} will start depending on
src/tar.{o,to}.  If each file has its own main function when -DTEST is
given, then I wont be able to link them together.

I took the opportunity that I had to change the Makefile, and I
improved the dependency between targets and dependencies greatly.  From
what I can tell now, it is correct.

5 files changed, 27 insertions, 39 deletions

diff --git a/src/gistatic.c b/src/gistatic.c
index a2b10fc..0a65b6c 100644
--- a/src/gistatic.c
+++ b/src/gistatic.c
@@ -1,4 +1,5 @@
 #include "config.h"
+#include "tar.h"
 #include "gistatic.h"
 
 #include <stdlib.h>
@@ -2046,7 +2047,7 @@ cleanup:
 }
 
 #ifdef TEST
-static void unit_tests(){
+void unit_tests_gistatic(void) {
 	dump_translatable_strings();
 
 	git_libgit2_init();
@@ -2182,10 +2183,3 @@ cleanup:
 	}
 	return ret;
 }
-
-#ifdef TEST
-int main(void) {
-	unit_tests();
-	return EXIT_SUCCESS;
-}
-#endif
diff --git a/src/gistatic.h b/src/gistatic.h
index 03c02f6..7e022fa 100644
--- a/src/gistatic.h
+++ b/src/gistatic.h
@@ -3,4 +3,8 @@
 
 int gistatic_main(int argc, char *argv[]);
 
+#ifdef TEST
+void unit_tests_gistatic(void);
+#endif
+
 #endif
diff --git a/src/main.c b/src/main.c
index 52c749f..34214ea 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,5 +1,20 @@
+#include "tar.h"
 #include "gistatic.h"
 
+#include <stdlib.h>
+
+#ifdef TEST
+static void unit_tests(void) {
+	unit_tests_tar();
+	unit_tests_gistatic();
+}
+#endif
+
 int main(int argc, char *argv[]) {
+#ifdef TEST
+	unit_tests();
+	return EXIT_SUCCESS;
+#endif
+
 	return gistatic_main(argc, argv);
 }
diff --git a/src/tar.c b/src/tar.c
index 63aebe8..43a580c 100644
--- a/src/tar.c
+++ b/src/tar.c
@@ -1,36 +1,6 @@
 #include "config.h"
 #include "tar.h"
 
-
 #ifdef TEST
-
-#include "tests-lib.h"
-
-#include <stdbool.h>
-#include <stdlib.h>
-#include <assert.h>
-
-#endif
-
-
-void a(void) { }
-
-#ifdef TEST
-static void test_a(void) {
-	test_start("test_a:");
-	{
-		testing("a");
-		assert(true);
-		test_ok();
-	}
-}
-
-static void unit_tests(void) {
-	test_a();
-}
-
-int main(void) {
-	unit_tests();
-	return EXIT_SUCCESS;
-}
+void unit_tests_tar(void) {}
 #endif
diff --git a/src/tar.h b/src/tar.h
index 09d1c18..29c75bc 100644
--- a/src/tar.h
+++ b/src/tar.h
@@ -1,3 +1,8 @@
 #ifndef GISTATIC_TAR_H
 #define GISTATIC_TAR_H
+
+#ifdef TEST
+void unit_tests_tar(void);
+#endif
+
 #endif