From f5b1c16e2c1a8139885176cbd53a6d37bf9d006c Mon Sep 17 00:00:00 2001
From: Victor Zverovich <victor.zverovich@gmail.com>
Date: Mon, 7 Nov 2016 18:52:08 -0800
Subject: [PATCH] Add version macro FMT_VERSION (#411)

---
 CMakeLists.txt | 30 ++++++++++++++++++++++--------
 fmt/format.h   |  3 +++
 2 files changed, 25 insertions(+), 8 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 353940f8..b08f9cbe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,12 +9,22 @@ if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
   set(MASTER_PROJECT ON)
 endif ()
 
+# Joins arguments and places the results in ${result_var}.
+function(join result_var)
+  set(result )
+  foreach (arg ${ARGN})
+    set(result "${result}${arg}")
+  endforeach ()
+  set(${result_var} "${result}" PARENT_SCOPE)
+endfunction()
+
 # Set the default CMAKE_BUILD_TYPE to Release.
 # This should be done before the project command since the latter can set
 # CMAKE_BUILD_TYPE itself (it does so for nmake).
 if (NOT CMAKE_BUILD_TYPE)
-  set(CMAKE_BUILD_TYPE Release CACHE STRING
-    "Choose the type of build, options are: None(CMAKE_CXX_FLAGS or CMAKE_C_FLAGS used) Debug Release RelWithDebInfo MinSizeRel.")
+  join(doc "Choose the type of build, options are: None(CMAKE_CXX_FLAGS or "
+           "CMAKE_C_FLAGS used) Debug Release RelWithDebInfo MinSizeRel.")
+  set(CMAKE_BUILD_TYPE Release CACHE STRING ${doc})
 endif ()
 
 option(FMT_PEDANTIC "Enable extra warnings and expensive tests." OFF)
@@ -28,13 +38,17 @@ option(FMT_USE_CPP11 "Enable the addition of C++11 compiler flags." ON)
 project(FMT)
 
 # Starting with cmake 3.0 VERSION is part of the project command.
-set(FMT_VERSION 3.1.0)
-if (NOT FMT_VERSION MATCHES "^([0-9]+).([0-9]+).([0-9]+)$")
-  message(FATAL_ERROR "Invalid version format ${FMT_VERSION}.")
+file(READ fmt/format.h format_h)
+if (NOT format_h MATCHES "FMT_VERSION ([0-9]+)([0-9][0-9])([0-9][0-9])")
+  message(FATAL_ERROR "Cannot get FMT_VERSION from format.h.")
 endif ()
-set(CPACK_PACKAGE_VERSION_MAJOR ${CMAKE_MATCH_1})
-set(CPACK_PACKAGE_VERSION_MINOR ${CMAKE_MATCH_2})
-set(CPACK_PACKAGE_VERSION_PATCH ${CMAKE_MATCH_3})
+# Use math to skip leading zeros if any.
+math(EXPR CPACK_PACKAGE_VERSION_MAJOR ${CMAKE_MATCH_1})
+math(EXPR CPACK_PACKAGE_VERSION_MINOR ${CMAKE_MATCH_2})
+math(EXPR CPACK_PACKAGE_VERSION_PATCH ${CMAKE_MATCH_3})
+join(FMT_VERSION ${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSION_MINOR}.
+                 ${CPACK_PACKAGE_VERSION_PATCH})
+message(STATUS "Version: ${FMT_VERSION}")
 
 message(STATUS "Build type: ${CMAKE_BUILD_TYPE}")
 
diff --git a/fmt/format.h b/fmt/format.h
index 182d496a..9f0995ab 100644
--- a/fmt/format.h
+++ b/fmt/format.h
@@ -40,6 +40,9 @@
 #include <vector>
 #include <utility>
 
+// The fmt library version in the form major * 10000 + minor * 100 + patch.
+#define FMT_VERSION 30002
+
 #ifdef _SECURE_SCL
 # define FMT_SECURE_SCL _SECURE_SCL
 #else