add includedirs for swig

tests/projects/swig/auto_include/src/example.cpp

@@ -0,0 +1,14 @@
+double My_variable = 3.0;
+
+/* Compute factorial of n */
+int fact(int n) {
+    if (n <= 1)
+        return 1;
+    else
+        return n*fact(n-1);
+}
+
+/* Compute n mod m */
+int my_mod(int n, int m) {
+    return(n % m);
+}

tests/projects/swig/auto_include/src/example.i

@@ -0,0 +1,13 @@
+%module example
+
+%{
+/* Put headers and other declarations here */
+#include "nlohmann/json.hpp"
+extern double My_variable;
+extern int    fact(int);
+extern int    my_mod(int n, int m);
+%}
+
+extern double My_variable;
+extern int    fact(int);
+extern int    my_mod(int n, int m);

tests/projects/swig/auto_include/xmake.lua

@@ -0,0 +1,10 @@
+add_rules("mode.release", "mode.debug")
+add_requires("python 3.x")
+add_requires("nlohmann_json")
+
+target("example")
+    add_rules("swig.cpp", {moduletype = "python"})
+    add_files("src/example.i", {scriptdir = "share"})
+    add_files("src/example.cpp")
+    add_packages("python")
+    add_packages("nlohmann_json")

xmake/rules/swig/build_module_file.lua

@@ -22,26 +22,46 @@
 import("lib.detect.find_tool")
 
 function main(target, batchcmds, sourcefile, opt)
-
     -- get swig
     opt = opt or {}
     local swig = assert(find_tool("swig"), "swig not found!")
-    local sourcefile_cx = path.join(target:autogendir(), "rules", "swig", path.basename(sourcefile) .. (opt.sourcekind == "cxx" and ".cpp" or ".c"))
+    local sourcefile_cx = path.join(target:autogendir(), "rules", "swig",
+        path.basename(sourcefile) .. (opt.sourcekind == "cxx" and ".cpp" or ".c"))
 
     -- add objectfile
     local objectfile = target:objectfile(sourcefile_cx)
     table.insert(target:objectfiles(), objectfile)
 
     -- add commands
     local moduletype = assert(target:data("swig.moduletype"), "swig.moduletype not found!")
-    local argv = {"-" .. moduletype, "-o", sourcefile_cx}
+    local argv = { "-" .. moduletype, "-o", sourcefile_cx }
     if opt.sourcekind == "cxx" then
         table.insert(argv, "-c++")
     end
     local fileconfig = target:fileconfig(sourcefile)
     if fileconfig.swigflags then
         table.join2(argv, fileconfig.swigflags)
     end
+
+    -- add includedirs
+    local function _get_values_from_target(target, name)
+        local values = {}
+        for _, value in ipairs((target:get_from(name, "*"))) do
+            table.join2(values, value)
+        end
+        return table.unique(values)
+    end
+    local pathmaps = {
+        { "includedirs",    "includedir" },
+        { "sysincludedirs", "includedir" },
+        { "frameworkdirs",  "frameworkdir" }
+    }
+    for _, pathmap in ipairs(pathmaps) do
+        for _, item in ipairs(_get_values_from_target(target, pathmap[1])) do
+            table.join2(argv, "-I" .. item)
+        end
+    end
+
     table.insert(argv, sourcefile)
     batchcmds:show_progress(opt.progress, "${color.build.object}compiling.swig.%s %s", moduletype, sourcefile)
     batchcmds:mkdir(path.directory(sourcefile_cx))