1 files changed, 78 insertions, 0 deletions
diff --git a/cmake/modules/VersionGen.cmake b/cmake/modules/VersionGen.cmake
new file mode 100644
index 00000000..340455b3
--- /dev/null
+++ b/cmake/modules/VersionGen.cmake
@@ -0,0 +1,78 @@
+# Redistribution and use is allowed according to the terms of the BSD license.
+#
+# Copyright (c) 2011 Peter Johnson
+
+macro (VERSION_GEN _version _version_file _default_version)
+    set (_vn "v${_default_version}")
+
+    # First see if there is a version file (included in release tarballs),
+    # then try git-describe, then default.
+    if (EXISTS "${CMAKE_SOURCE_DIR}/version")
+        file (STRINGS "${CMAKE_SOURCE_DIR}/version" _version_strs LIMIT_COUNT 1)
+        list (GET _version_strs 0 _version_strs0)
+        if (NOT (${_version_strs0} STREQUAL ""))
+            set (_vn "v${_version_strs0}")
+        endif (${_version_strs0})
+    elseif (EXISTS "${CMAKE_SOURCE_DIR}/.git")
+        execute_process (COMMAND git describe --match "v[0-9]*" --abbrev=4 HEAD
+                         RESULT_VARIABLE _git_result
+                         OUTPUT_VARIABLE _git_vn
+                         ERROR_QUIET
+                         OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+        if (_git_result EQUAL 0)
+            # Special handling until we get a more recent tag on the master
+            # branch
+            if (_git_vn MATCHES "^v0[.]1[.]0")
+                execute_process (COMMAND git merge-base v${_default_version} HEAD
+                                 OUTPUT_VARIABLE _merge_base
+                                 ERROR_QUIET
+                                 OUTPUT_STRIP_TRAILING_WHITESPACE)
+                #message (STATUS "Merge base: ${_merge_base}")
+
+                execute_process (COMMAND git rev-list ${_merge_base}..HEAD
+                                 OUTPUT_VARIABLE _rev_list
+                                 ERROR_QUIET)
+                string (REGEX MATCHALL "[^\n]*\n" _rev_list_lines "${_rev_list}")
+                #message (STATUS "Rev list: ${_rev_list_lines}")
+                list (LENGTH _rev_list_lines _vn1)
+
+                execute_process (COMMAND git rev-list --max-count=1 --abbrev-commit --abbrev=4 HEAD
+                                 OUTPUT_VARIABLE _vn2
+                                 ERROR_QUIET
+                                 OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+                set (_git_vn "v${_default_version}-${_vn1}-g${_vn2}")
+            endif (_git_vn MATCHES "^v0[.]1[.]0")
+
+            # Append -dirty if there are local changes
+            execute_process (COMMAND git update-index -q --refresh)
+            execute_process (COMMAND git diff-index --name-only HEAD --
+                             OUTPUT_VARIABLE _git_vn_dirty)
+            if (_git_vn_dirty)
+                set (_git_vn "${_git_vn}-dirty")
+            endif (_git_vn_dirty)
+
+            # Substitute . for - in the result
+            string (REPLACE "-" "." _vn "${_git_vn}")
+        endif (_git_result EQUAL 0)
+    endif (EXISTS "${CMAKE_SOURCE_DIR}/version")
+
+    # Strip leading "v" from version
+    #message (STATUS "_vn: ${_vn}")
+    string (REGEX REPLACE "^v*(.+)" "\\1" _vn "${_vn}")
+
+    # Update version file if required
+    if (EXISTS ${_version_file})
+        file (STRINGS ${_version_file} _version_strs LIMIT_COUNT 1)
+        list (GET _version_strs 0 _vc)
+    else (EXISTS ${_version_file})
+        set (_vc "unset")
+    endif (EXISTS ${_version_file})
+    if (NOT ("${_vn}" STREQUAL "${_vc}"))
+        file (WRITE ${_version_file} "${_vn}")
+    endif (NOT ("${_vn}" STREQUAL "${_vc}"))
+
+    # Set output version variable
+    set (${_version} ${_vn})
+endmacro (VERSION_GEN)