From 848100cb2fe6ac3851b481a08876dc85129b0208 Mon Sep 17 00:00:00 2001
From: =?utf8?q?R=C3=A9mi=20Verschelde?= <rverschelde@gmail.com>
Date: Tue, 24 Jan 2017 19:34:09 +0100
Subject: [PATCH] CMake: Add version logic and make it generate Version.hpp

Part of #82.
---
 .gitignore            |  1 +
 CMakeLists.txt        | 51 ++++++++++++++++++++++++++++++++++++++++++-
 Source/Version.hpp.in | 46 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 97 insertions(+), 1 deletion(-)
 create mode 100644 Source/Version.hpp.in

diff --git a/.gitignore b/.gitignore
index ab0ef35..2e8676a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,3 +17,4 @@ Makefile
 cscope.*
 Data/users
 Data/config.txt
+Source/Version.hpp
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d798d41..ac908f0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,12 +16,61 @@ if(UNIX AND NOT APPLE)
 endif()
 
 
+### Version
+
+# Version for the current (stable) or next (development) release
+set(LUGARU_VERSION_MAJOR 1)
+set(LUGARU_VERSION_MINOR 2)
+set(LUGARU_VERSION_PATCH 0)
+
+# MAJOR.MINOR, or MAJOR.MINOR.PATCH if PATCH != 0
+set(LUGARU_VERSION_NUMBER "${LUGARU_VERSION_MAJOR}.${LUGARU_VERSION_MINOR}")
+if(LUGARU_VERSION_PATCH)
+    set(LUGARU_VERSION_NUMBER "${LUGARU_VERSION_NUMBER}.${LUGARU_VERSION_PATCH}")
+endif()
+
+# Set to "" for stable (tagged) builds, "-dev" for dev builds
+set(LUGARU_VERSION_SUFFIX "-dev")  # development
+#set(LUGARU_VERSION_SUFFIX "")  # stable
+
+# Set to 7-char git commit hash if available, otherwise "".
+# On stable (tagged) builds, this is ignored.
+set(LUGARU_VERSION_HASH "")
+if(LUGARU_VERSION_SUFFIX STREQUAL "-dev" AND EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/.git)
+    find_package(Git)
+    if(GIT_FOUND)
+        execute_process(
+            COMMAND ${GIT_EXECUTABLE} rev-parse --short HEAD
+            WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+            OUTPUT_VARIABLE "LUGARU_VERSION_HASH"
+            ERROR_QUIET
+            OUTPUT_STRIP_TRAILING_WHITESPACE)
+        message(STATUS "Git commit hash: ${LUGARU_VERSION_HASH}")
+    endif()
+endif()
+
+set(LUGARU_VERSION_RELEASE "" CACHE STRING "Optional release string, e.g. for distro packages release number")
+
+# Final string built from the above constants, following the scheme:
+# MAJOR.MINOR[.PATCH][-dev] [(git HASH)] [[RELEASE]]
+set(LUGARU_VERSION_STRING "${LUGARU_VERSION_NUMBER}${LUGARU_VERSION_SUFFIX}")
+if(NOT LUGARU_VERSION_HASH STREQUAL "")
+    set(LUGARU_VERSION_STRING "${LUGARU_VERSION_STRING} (git ${LUGARU_VERSION_HASH})")
+endif()
+if(NOT LUGARU_VERSION_RELEASE STREQUAL "")
+    set(LUGARU_VERSION_STRING "${LUGARU_VERSION_STRING} [${LUGARU_VERSION_RELEASE}]")
+endif()
+
+message(STATUS "Version string: ${LUGARU_VERSION_STRING}")
+configure_file(${SRCDIR}/Version.hpp.in ${SRCDIR}/Version.hpp ESCAPE_QUOTES @ONLY)
+
+
 ### CMake config
 
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE RelWithDebInfo)
 endif(NOT CMAKE_BUILD_TYPE)
-message("CMake build type: ${CMAKE_BUILD_TYPE}")
+message(STATUS "CMake build type: ${CMAKE_BUILD_TYPE}")
 
 set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wno-parentheses -pedantic --std=gnu++11 ${CMAKE_CXX_FLAGS}")
 
diff --git a/Source/Version.hpp.in b/Source/Version.hpp.in
new file mode 100644
index 0000000..180ecc7
--- /dev/null
+++ b/Source/Version.hpp.in
@@ -0,0 +1,46 @@
+/*
+Copyright (C) 2003, 2010 - Wolfire Games
+Copyright (C) 2010-2016 - Lugaru contributors (see AUTHORS file)
+
+This file is part of Lugaru.
+
+Lugaru is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+Lugaru is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Lugaru.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/** Version number is either MAJOR.MINOR, or MAJOR.MINOR.PATCH if PATCH != 0 */
+const unsigned int VERSION_MAJOR = @LUGARU_VERSION_MAJOR@;
+const unsigned int VERSION_MINOR = @LUGARU_VERSION_MINOR@;
+const unsigned int VERSION_PATCH = @LUGARU_VERSION_PATCH@;
+const std::string VERSION_NUMBER = "@LUGARU_VERSION_NUMBER@";
+
+/** Set to "" for stable (tagged) builds, "-dev" for dev builds */
+const std::string VERSION_SUFFIX = "@LUGARU_VERSION_SUFFIX@";
+/** Set to 7-char git commit hash if available, otherwise "" */
+const std::string VERSION_HASH = "@LUGARU_VERSION_HASH@";
+/** Optional release string, e.g. for distro packages release number */
+const std::string VERSION_RELEASE = "@LUGARU_VERSION_RELEASE@";
+
+/** Final string built from the above constants, following the scheme
+ *  defined in CMakeLists.txt, typically:
+ *      MAJOR.MINOR[.PATCH][-dev] [(git HASH)] [[RELEASE]]
+ *
+ *  For example:
+ *      "1.2-dev (git ab12c34)"
+ *      "1.2-dev (git ab12c34) [OSS Lugaru official]"
+ *      "1.3.1 [Mageia 1.3.1-2.mga6]"
+ */
+const std::string VERSION_STRING = "@LUGARU_VERSION_STRING@";
+
+/** Build type (Release, Debug, RelWithDebInfo) to output to the terminal */
+const std::string VERSION_BUILD_TYPE = "@CMAKE_BUILD_TYPE@";
-- 
2.39.5