From dab6f2bcf292dfd6ee629a4ad9b2216e104d7c1d Mon Sep 17 00:00:00 2001
From: Elie Tournier <tournier.elie@gmail.com>
Date: Thu, 20 Apr 2017 14:06:56 +0100
Subject: Add a getter for the library version.

This value is save when running CMake.

Signed-off-by: Elie Tournier <tournier.elie@gmail.com>
---
 CMakeLists.txt | 23 +++++++++++++++++++++++
 NK_C_API.cc    |  4 ++++
 NK_C_API.h     |  8 ++++++++
 3 files changed, 35 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8259f67..537a54a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,6 +41,29 @@ include(GNUInstallDirs)
 
 OPTION(LIBNITROKEY_STATIC "Build libnitrokey statically" FALSE)
 
+# Getter for the library version
+#
+# If a git tag is available, we use it.
+# Else, we use a git version and we raise a warning.
+#
+exec_program(
+  "git"
+  ${CMAKE_CURRENT_SOURCE_DIR}
+  ARGS "describe"
+  OUTPUT_VARIABLE GIT_VERSION)
+
+IF(${GIT_TAG} MATCHES "fatal:.*")
+MESSAGE(WARNING "Unable to find a git tag. Using git version instead.")
+exec_program(
+  "git"
+  ${CMAKE_CURRENT_SOURCE_DIR}
+  ARGS "rev-parse HEAD"
+  OUTPUT_VARIABLE GIT_VERSION)
+ENDIF()
+
+MESSAGE("LIBRARY VERSION: ${GIT_VERSION} ")
+ADD_DEFINITIONS(-DVERSION="${GIT_VERSION}")
+
 
 IF (NOT CMAKE_BUILD_TYPE)
     IF(APPLE)
diff --git a/NK_C_API.cc b/NK_C_API.cc
index e730bae..6f4c757 100644
--- a/NK_C_API.cc
+++ b/NK_C_API.cc
@@ -532,6 +532,10 @@ extern "C" {
 	}
 
 
+	NK_C_API const char * NK_version() {
+	   return VERSION;
+	}
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/NK_C_API.h b/NK_C_API.h
index 3742b43..96e5836 100644
--- a/NK_C_API.h
+++ b/NK_C_API.h
@@ -475,6 +475,14 @@ extern "C" {
 	 */
 	NK_C_API int NK_get_progress_bar_value();
 
+	/**
+	 * Return the version of the library.
+	 * If a git tag is available, return it else return the git version.
+	 * This value is defined at the compilation time.
+	 * @return the version of the library
+	 */
+	NK_C_API const char * NK_version();
+
 #ifdef __cplusplus
 }
 #endif
-- 
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