Add rule python.cython

Author: Freed-Wu

xmake/rules/python/cython/xmake.lua

@@ -0,0 +1,46 @@
+--!A cross-platform build utility based on Lua
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+--
+-- Copyright (C) 2015-present, TBOOX Open Source Group.
+--
+-- @author      Wu, Zhenyu
+-- @file        xmake.lua
+--
+
+rule("python.cython")
+    set_extensions(".py", ".pyx")
+    before_buildcmd_file(function(target, batchcmds, sourcefile, opt)
+        local dirname = path.join(target:autogendir(), "rules", "python", "cython")
+        local sourcefile_c = path.join(dirname, path.basename(sourcefile) .. ".c")
+
+        -- add objectfile
+        local objectfile = target:objectfile(sourcefile_c)
+        table.insert(target:objectfiles(), objectfile)
+
+        -- add commands
+        batchcmds:show_progress(opt.progress, "${color.build.object}compiling.python %s", sourcefile)
+        batchcmds:mkdir(path.directory(sourcefile_c))
+        import("lib.detect.find_tool")
+        local cython = find_tool("cython")
+        assert(cython, "cython not found! please `pip install cython`.")
+        batchcmds:vrunv(cython.program,
+            { "-3o", path(sourcefile_c), path(sourcefile) })
+        -- remember to add_rules("c") if you need
+        batchcmds:compile(sourcefile_c, objectfile)
+
+        -- add deps
+        batchcmds:add_depfiles(sourcefile)
+        batchcmds:set_depmtime(os.mtime(objectfile))
+        batchcmds:set_depcache(target:dependfile(objectfile))
+    end)