Addition of REVISION() macro for tracking SVN revision.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8213 c06c8d41-db1a-0410-9941-cceddc491573

3 files changed, 43 insertions, 0 deletions

diff --git a/crawl-ref/source/makefile.obj b/crawl-ref/source/makefile.obj
index 8e02163420..9ef6148e86 100644
--- a/crawl-ref/source/makefile.obj
+++ b/crawl-ref/source/makefile.obj
@@ -85,6 +85,7 @@ transfor.o \
 traps.o \
 travel.o \
 tutorial.o \
+version.o \
 view.o \
 xom.o \
 Kills.o \
diff --git a/crawl-ref/source/version.cc b/crawl-ref/source/version.cc
new file mode 100644
index 0000000000..3ab89fff41
--- /dev/null
+++ b/crawl-ref/source/version.cc
@@ -0,0 +1,24 @@
+/*
+ *  File:       version.cc
+ *  Summary:    Version (and revision) functionality.
+ *  Written by: Enne Walker
+ *
+ *  Modified for Crawl Reference by $Author$ on $Date$
+ */
+
+#include "AppHdr.h"
+#include "version.h"
+
+REVISION("$Rev$")
+
+int check_revision::max_rev = 0;
+
+check_revision::check_revision(int rev)
+{
+    max_rev = std::max(rev, max_rev);
+}
+
+int svn_revision()
+{
+    return check_revision::max_rev;
+}
diff --git a/crawl-ref/source/version.h b/crawl-ref/source/version.h
index 73a776ac35..716a153222 100644
--- a/crawl-ref/source/version.h
+++ b/crawl-ref/source/version.h
@@ -53,4 +53,22 @@
 #define VERSION_DETAIL BUILD_DATE
 #endif
 
+// Returns the largest SVN revision number that a source file has been updated
+// to.  This is not perfectly accurate, but should be good enough for save
+// files, as breaking a save almost always involves changing a source file.
+int svn_revision();
+
+class check_revision
+{
+public:
+    check_revision(int rev);
+    static int max_rev;
+};
+
+// This macro is meant to be used once per source file, e.g. "REVISION($Rev$);"
+// It can't be put in header files, as there's no way to generate a unique
+// object name across includes.  Blame the lack of cross-platform __COUNTER__.
+//#define REVISION(rev) static check_revision check_this_source_file_revision(rev)
+#define REVISION(rev)
+
 #endif