export version number of lib

.gitignore

@@ -15,3 +15,4 @@ config.log
 libtool
 rsrc/lib-version.txt
 version-info*.txt
+src/revision.hpp

GNUmakefile.in

@@ -132,6 +132,23 @@ $(OBJDIR)/Symmetry.lo: src/SymOpTable_data.cpp
 
 endif
 
+REVISION = $(shell git log --pretty=format:%h --max-count=1)
+REVISION_FILE = version-info-$(REVISION).txt
+
+$(REVISION_FILE):
+	rm -f version-info-*.txt
+	git describe --match=build --dirty > $@
+	@ git log --pretty=medium --date=iso8601 -1 >> $@
+
+src/revision.hpp: $(REVISION_FILE)
+	@ echo 'const char kRevision[] = R"(' > $@
+	@ cat $? >> $@
+	@ echo ')";' >> $@
+
+$(OBJDIR)/CifUtils.o: src/revision.hpp
+
+$(OBJDIR)/CifUtils.lo: src/revision.hpp
+
 $(LIB_TARGET): $(OBJECTS)
 	$(CXXLINK) -rpath $(libdir) $(OBJECTS) $(LIBS)
 

include/cif++/CifUtils.hpp

@@ -54,6 +54,12 @@ extern const char gResourceName[];
 namespace cif
 {
 
+// the git 'build' number
+std::string get_version_nr();
+// std::string get_version_date();
+
+// --------------------------------------------------------------------
+
 // some basic utilities: Since we're using ASCII input only, we define for optimisation
 // our own case conversion routines.
 

src/CifUtils.cpp

@@ -37,6 +37,7 @@
 #include <fstream>
 #include <map>
 #include <chrono>
+#include <regex>
 
 #if defined(_MSC_VER)
 #define TERM_WIDTH 80
@@ -58,6 +59,40 @@ namespace cif
 extern int VERBOSE;
 
 // --------------------------------------------------------------------
+
+std::string get_version_nr()
+{
+	const std::regex
+		rxVersionNr(R"(build-(\d+)-g[0-9a-f]{7}(-dirty)?)");
+
+#include "revision.hpp"
+
+	struct membuf : public std::streambuf
+	{
+		membuf(char* data, size_t length)       { this->setg(data, data, data + length); }
+	} buffer(const_cast<char*>(kRevision), sizeof(kRevision));
+
+	std::istream is(&buffer);
+
+	std::string line, result;
+
+	while (getline(is, line))
+	{
+		std::smatch m;
+
+		if (std::regex_match(line, m, rxVersionNr))
+		{
+			result = m[1];
+			if (m[2].matched)
+				result += '*';
+			break;
+		}
+	}
+
+	return result;
+}
+
+// --------------------------------------------------------------------
 // This really makes a difference, having our own tolower routines
 
 const uint8_t kCharToLowerMap[256] =