add civetweb. (#997)

* add civetweb.

* civetweb: add on_test.

* civetweb: enable more feature, add link option for bsd, mingw.

* civetweb: try fix build on msys.

* civetweb: patch to fix platform mingw.

* civetweb: force link with ws2_32 for shared mingw build.

The need for this is because civetweb's FindWinSock.cmake is not
reliable.

* civetweb: fix patch.

Replacing ":" with ";" only on Unix systems.

* civetweb: use CMAKE_HOST_WIN32 in FindWinSock.

* Update xmake.lua

Co-authored-by: ruki <waruqi@gmail.com>

packages/c/civetweb/patches/v1.15/find-winsock.patch

@@ -0,0 +1,31 @@
+diff --git a/cmake/FindWinSock.cmake b/cmake/FindWinSock.cmake
+index 25c4f2fa..26753e5d 100644
+--- a/cmake/FindWinSock.cmake
++++ b/cmake/FindWinSock.cmake
+@@ -39,6 +39,7 @@ endmacro(REMOVE_DUPLICATE_PATHS)
+ 
+ set(WINSOCK_INCLUDE_PATHS "${WINSOCK_ROOT}/include/")
+ if(MINGW)
++  file(TOUCH ${CMAKE_BINARY_DIR}/nul)
+   execute_process(
+     COMMAND ${CMAKE_C_COMPILER} -xc -E -v -
+     RESULT_VARIABLE RESULT
+@@ -71,7 +72,17 @@ if(MINGW)
+   )
+   if (NOT RESULT)
+     string(REGEX MATCH "libraries: =([^\r\n]*)" OUT "${OUT}")
+-    list(APPEND WINSOCK_LIBRARY_PATHS "${CMAKE_MATCH_1}")
++    if(CMAKE_HOST_WIN32)
++      message(STATUS "not replacing ${_SEARCH_PATHS}")
++      list(APPEND WINSOCK_LIBRARY_PATHS "${CMAKE_MATCH_1}")
++    else()
++      # On Unix-like host systems, search dirs are separated by ':'.
++      # Thus we need to replace ':' with ';' to make a valid cmake list.
++      string(REPLACE ":" ";" _SEARCH_PATHS "${CMAKE_MATCH_1}")
++      message(STATUS "after replace ${_SEARCH_PATHS}")
++      list(APPEND WINSOCK_LIBRARY_PATHS "${_SEARCH_PATHS}")
++      unset(_SEARCH_PATHS)
++    endif()
+   endif()
+ endif()
+ if ("${CMAKE_HOST_SYSTEM_PROCESSOR}" STREQUAL "AMD64" AND "${CMAKE_SIZEOF_VOID_P}" EQUAL 4)

packages/c/civetweb/xmake.lua

@@ -0,0 +1,61 @@
+package("civetweb")
+
+    set_homepage("https://github.com/civetweb/civetweb")
+    set_description("Embedded C/C++ web server")
+    set_license("MIT")
+
+    add_urls("https://github.com/civetweb/civetweb/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/civetweb/civetweb.git")
+    add_versions('v1.15', '90a533422944ab327a4fbb9969f0845d0dba05354f9cacce3a5005fa59f593b9')
+    add_patches("v1.15", path.join(os.scriptdir(), "patches", "v1.15", "find-winsock.patch"), "4d8355169fb20ede0fdae2a8bc8561238a088cf810e36107ba267f273989d9ee")
+
+    add_configs("openssl", {description = "with openssl library", default = false, type = "boolean"})
+    add_configs("zlib",    {description = "Enable zlib support.", default = false, type = "boolean"})
+
+    add_deps("cmake")
+
+    if is_plat("linux") or is_plat("bsd") then
+        add_syslinks("pthread")
+    elseif is_plat("mingw", "windows") then
+        add_syslinks("ws2_32")
+    end
+
+    on_load(function (package)
+        local configdeps = {
+            openssl = "openssl",
+            zlib    = "zlib",
+        }
+        for name, dep in pairs(configdeps) do
+            if package:config(name) then
+                package:add("deps", dep)
+            end
+        end
+    end)
+
+    on_install(function (package)
+        local configs = {
+            "-DCIVETWEB_BUILD_TESTING=OFF",
+            "-DCIVETWEB_ENABLE_DEBUG_TOOLS=OFF",
+            "-DCIVETWEB_ENABLE_CXX=ON",
+            "-DCIVETWEB_ENABLE_SERVER_EXECUTABLE=OFF",
+            "-DCIVETWEB_ENABLE_WEBSOCKETS=ON",
+            "-DCIVETWEB_ENABLE_SSL_DYNAMIC_LOADING=OFF",
+            "-DCIVETWEB_ENABLE_IPV6=ON",
+        }
+
+        table.insert(configs, "-DCMAKE_BUILD_TYPE=" .. (package:debug() and "Debug" or "Release"))
+        table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (package:config("shared") and "ON" or "OFF"))
+        table.insert(configs, "-DCIVETWEB_ENABLE_SSL=" .. (package:config("openssl") and "ON" or "OFF"))
+        table.insert(configs, "-DCIVETWEB_ENABLE_ZLIB=" .. (package:config("zlib") and "ON" or "OFF"))
+
+        -- make sure ws2_32 is always used even find-winsock doesn't work
+        if package:is_plat("mingw") and package:config("shared") then
+            io.replace("src/CMakeLists.txt", "if (WINSOCK_FOUND)", "if (TRUE)", {plain = true})
+            io.replace("src/CMakeLists.txt", "WINSOCK::WINSOCK", "ws2_32", {plain = true})
+        end
+        import("package.tools.cmake").install(package, configs)
+    end)
+
+    on_test(function (package)
+        assert(package:has_cfuncs("mg_start", {includes = "civetweb.h"}))
+    end)