Implement FindENET.cmake

This library will be later used for networking over UDP/IPv4 in future
commits.

1 files changed, 88 insertions, 0 deletions

diff --git a/cmake/FindENET.cmake b/cmake/FindENET.cmake
new file mode 100755
index 0000000..504aa23
--- /dev/null
+++ b/cmake/FindENET.cmake
@@ -0,0 +1,88 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[=======================================================================[.rst:
+FindENET
+-----------
+
+Locate ENET library
+
+This module defines:
+
+::
+
+  ENET, the name of the target to use with target_*() commands
+  ENET_LIBRARIES, the name of the library to link against
+  ENET_INCLUDE_DIRS, where to find the headers
+  ENET_FOUND, if false, do not try to link against
+  ENET_VERSION_STRING - human-readable string containing the
+                             version of ENET
+
+$ENETDIR is an environment variable that would correspond to the
+./configure --prefix=$ENETDIR used in building ENET.
+#]=======================================================================]
+
+find_path(ENET_INCLUDE_DIRS
+  NAMES
+    enet/callbacks.h
+    enet/enet.h
+    enet/list.h
+    enet/protocol.h
+    enet/time.h
+    enet/types.h
+    enet/unix.h
+    enet/utility.h
+    enet/win32.h
+  HINTS
+    ENV ENETDIR
+  PATH_SUFFIXES
+    enet
+    # path suffixes to search inside ENV{ENETDIR}
+    include
+)
+
+if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+  set(VC_LIB_PATH_SUFFIX lib/x64)
+else()
+  set(VC_LIB_PATH_SUFFIX lib/x86)
+endif()
+
+find_library(ENET_LIBRARIES
+  NAMES enet
+  HINTS
+    ENV ENETDIR
+  PATH_SUFFIXES
+    lib
+    ${VC_LIB_PATH_SUFFIX}
+)
+
+if(ENET_INCLUDE_DIRS AND EXISTS "${ENET_INCLUDE_DIRS}/enet.h")
+  file(STRINGS "${ENET_INCLUDE_DIRS}/enet.h" ENET_VERSION_MAJOR_LINE REGEX "^#define[ \t]+ENET_VERSION_MAJOR[ \t]+[0-9]+$")
+  file(STRINGS "${ENET_INCLUDE_DIRS}/enet.h" ENET_VERSION_MINOR_LINE REGEX "^#define[ \t]+ENET_VERSION_MINOR[ \t]+[0-9]+$")
+  file(STRINGS "${ENET_INCLUDE_DIRS}/enet.h" ENET_VERSION_PATCH_LINE REGEX "^#define[ \t]+ENET_VERSION_PATCH[ \t]+[0-9]+$")
+  string(REGEX REPLACE "^#define[ \t]+ENET_VERSION_MAJOR[ \t]+([0-9]+)$" "\\1" ENET_VERSION_MAJOR "${ENET_VERSION_MAJOR_LINE}")
+  string(REGEX REPLACE "^#define[ \t]+ENET_VERSION_MINOR[ \t]+([0-9]+)$" "\\1" ENET_VERSION_MINOR "${ENET_VERSION_MINOR_LINE}")
+  string(REGEX REPLACE "^#define[ \t]+ENET_VERSION_PATCH[ \t]+([0-9]+)$" "\\1" ENET_VERSION_PATCH "${ENET_VERSION_PATCH_LINE}")
+  set(ENET_VERSION_STRING ${ENET_VERSION_MAJOR}.${ENET_VERSION_MINOR}.${ENET_VERSION_PATCH})
+  unset(ENET_VERSION_MAJOR_LINE)
+  unset(ENET_VERSION_MINOR_LINE)
+  unset(ENET_VERSION_PATCH_LINE)
+  unset(ENET_VERSION_MAJOR)
+  unset(ENET_VERSION_MINOR)
+  unset(ENET_VERSION_PATCH)
+endif()
+
+include(FindPackageHandleStandardArgs)
+
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(ENET
+                                  REQUIRED_VARS ENET_LIBRARIES ENET_INCLUDE_DIRS
+                                  VERSION_VAR ENET_VERSION_STRING)
+
+if(ENET_FOUND)
+  if(NOT TARGET ENET)
+    add_library(ENET INTERFACE IMPORTED)
+    set_target_properties(ENET PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES "${ENET_INCLUDE_DIRS}"
+      INTERFACE_LINK_LIBRARIES "${ENET_LIBRARIES}")
+  endif()
+endif()