nanopb: add package (#5795)

* nanopb: add package

* improve generator

* fix generator

packages/n/nanopb/xmake.lua

@@ -0,0 +1,55 @@
+package("nanopb")
+    set_homepage("https://jpa.kapsi.fi/nanopb/")
+    set_description("Protocol Buffers with small code size")
+    set_license("zlib")
+
+    set_urls("https://github.com/nanopb/nanopb/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/nanopb/nanopb.git")
+
+    add_versions("0.4.9", "524882ce9b6b8abeab3d458b9f15449c3f11d60c099eb388d8732d1bf2944eb3")
+
+    add_configs("generator", {description = "Build the protoc plugin for code generation", default = false, type = "boolean"})
+
+    add_deps("cmake")
+    add_deps("protobuf-cpp")
+
+    on_load(function (package)
+        if package:config("generator") then
+            package:add("deps", "python 3.x", {kind = "binary"})
+            package:addenv("PYTHONPATH", "lib/site-packages")
+        end
+    end)
+
+    on_install(function (package)
+        local configs = {
+            "-Dnanopb_BUILD_RUNTIME=ON",
+            "-Dnanopb_MSVC_STATIC_RUNTIME=OFF",
+        }
+        table.insert(configs, "-DCMAKE_BUILD_TYPE=" .. (package:is_debug() and "Debug" or "Release"))
+        table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (package:config("shared") and "ON" or "OFF"))
+        table.insert(configs, "-DBUILD_STATIC_LIBS=" .. (package:config("shared") and "OFF" or "ON"))
+        if package:config("shared") and package:is_plat("windows") then
+            table.insert(configs, "-DCMAKE_WINDOWS_EXPORT_ALL_SYMBOLS=ON")
+        end
+
+        if package:config("generator") then
+            table.insert(configs, "-Dnanopb_BUILD_GENERATOR=ON")
+            table.insert(configs, "-Dnanopb_PYTHON_INSTDIR_OVERRIDE=" .. package:installdir("lib/site-packages"))
+            if is_host("windows") then
+                local python = package:dep("python")
+                if python:is_system() then
+                    table.insert(configs, "-DPython_EXECUTABLE=python")
+                else
+                    table.insert(configs, "-DPython_EXECUTABLE=" .. python:installdir("bin/python.exe"))
+                end
+            end
+        else
+            table.insert(configs, "-Dnanopb_BUILD_GENERATOR=OFF")
+            table.insert(configs, "-Dnanopb_PYTHON_INSTDIR_OVERRIDE=.")
+        end
+        import("package.tools.cmake").install(package, configs)
+    end)
+
+    on_test(function (package)
+        assert(package:has_cfuncs("pb_encode", {includes = "nanopb/pb_encode.h"}))
+    end)