# HG changeset patch
# User Hasan Yavuz ÖZDERYA <hy@ozderya.net>
# Date 2016-09-27 11:15:23
# Node ID 28eb5333089bc1d0948e17e21408c35fe0239034
# Parent  fd5f1eb480ec372b49df58b497458de05c30057c

draft of a script that extracts version information from source

.hg_archival.txt is added for test purposes, should be removed

diff --git a/.hg_archival.txt b/.hg_archival.txt
new file mode 100644
--- /dev/null
+++ b/.hg_archival.txt
@@ -0,0 +1,5 @@
+repo: 58db5f6bf2b13824531f84a0e3718f67513a9958
+node: fd5f1eb480ec372b49df58b497458de05c30057c
+branch: default
+latesttag: v0.8.0
+latesttagdistance: 77
diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -145,12 +145,14 @@ else()
 endif()
 
 # version number
-set(MAJOR_VERSION 0 CACHE INT "Program major version number.")
-set(MINOR_VERSION 8 CACHE INT "Program minor version number.")
-set(PATCH_VERSION 0 CACHE INT "Program patch version number.")
+# set(MAJOR_VERSION 0 CACHE INT "Program major version number.")
+# set(MINOR_VERSION 8 CACHE INT "Program minor version number.")
+# set(PATCH_VERSION 0 CACHE INT "Program patch version number.")
+
+# get version number from mercurial
+include(version)
 set(VERSION_STRING "${MAJOR_VERSION}.${MINOR_VERSION}.${PATCH_VERSION}")
 
-# get revision number from mercurial
 find_program(MERCURIAL hg)
 
 if (MERCURIAL)
diff --git a/cmake/modules/version.cmake b/cmake/modules/version.cmake
new file mode 100644
--- /dev/null
+++ b/cmake/modules/version.cmake
@@ -0,0 +1,39 @@
+
+find_program(MERCURIAL hg)
+
+# try hg_archival.txt file
+if (EXISTS ${CMAKE_SOURCE_DIR}/.hg_archival.txt)
+  message("Found .hg_archival.txt")
+  file(STRINGS "${CMAKE_SOURCE_DIR}/.hg_archival.txt" latest_tag_string
+    REGEX "latesttag:.*")
+  if (latest_tag_string)
+    message("Found ${latest_tag_string}")
+    string(REGEX REPLACE "latesttag:[ \t]*v([0-9.]+).*" "\\1"
+      found_version_string ${latest_tag_string})
+    message("Version from latest tag: ${found_version_string}")
+
+    if (found_version_string MATCHES "([0-9]+)[0-9.]*")
+      set(MAJOR_VERSION ${CMAKE_MATCH_1})
+    endif()
+
+    if (found_version_string MATCHES "[0-9]+\\.([0-9]+)[0-9.]*")
+      set(MINOR_VERSION ${CMAKE_MATCH_1})
+    endif()
+
+    if (found_version_string MATCHES "[0-9]+\\.[0-9]+\\.([0-9]+)")
+      set(PATCH_VERSION ${CMAKE_MATCH_1})
+    endif()
+
+    message("found_major_version: ${MAJOR_VERSION}")
+    message("found_minor_version: ${MINOR_VERSION}")
+    message("found_patch_version: ${PATCH_VERSION}")
+  else(latest_tag_string)
+    message(WARNING "Couldn't find latest tag in .hg_archival.txt.")
+  endif()
+
+elseif(MERCURIAL)
+
+
+
+endif()
+