fix header distribution of headeronly project

shared_module/xmake.lua

@@ -9,5 +9,5 @@ target("shared_module")
     set_kind("headeronly")
     add_includedirs("./", {public = true})
     add_packages("mimalloc", "parallel-hashmap", "range-v3", "eigen-latest", "xxhash", {public = true})
-    add_rules("library.force.distribute.header", {headers = path.join(os.scriptdir(), "math", "math_defs.h")})
+    add_rules("library.headeronly.distribute.header", {projectdir = os.scriptdir()})
 target_end()

xmake/rules/library/shared/xmake.lua

@@ -18,8 +18,9 @@ rule_end()
 rule("library.distribute.header")
     after_build(function (target)
         local projectdir = target:extraconf("rules", "library.distribute.header", "projectdir")
-        local outputdir = path.join(target:targetdir(), "..", "include")
+        local outputdir = path.join(os.projectdir(), "distribute", "include")
         if has_config("shipping_one") then
+            print("Distributing header files for project: " .. target:name())
             for _, filepath in ipairs(os.files(path.join(projectdir, "interface", "*.h"))) do 
                 local file = io.readfile(filepath)
 
@@ -32,6 +33,7 @@ rule("library.distribute.header")
                 local replace_api2 = string.gsub(replace_api1, "API", "__declspec(dllimport)")
                 
                 io.writefile(path.join(outputdir, path.filename(filepath)), replace_api2)
+                print("Distributed header file: " .. path.filename(filepath))
             end
         end
     end)
@@ -40,8 +42,9 @@ rule_end()
 rule("library.force.distribute.header")
     after_build(function (target)
         local headers = target:extraconf("rules", "library.force.distribute.header", "headers")
-        local outputdir = path.join(target:targetdir(), "..", "include")
+        local outputdir = path.join(os.projectdir(), "distribute", "include")
         if has_config("shipping_one") then
+            print("Forcing distribution of header files: " .. headers)
             for _, filepath in ipairs(os.files(headers)) do 
                 local file = io.readfile(filepath)
 
@@ -54,6 +57,21 @@ rule("library.force.distribute.header")
                 local replace_api2 = string.gsub(replace_api1, "API", "__declspec(dllimport)")
                 
                 io.writefile(path.join(outputdir, path.filename(filepath)), replace_api2)
+                print("Forced distribution of header file: " .. path.filename(filepath))
+            end
+        end
+    end)
+rule_end()
+
+rule("library.headeronly.distribute.header")
+    on_build(function (target)
+        print("Distributing header files for header-only library: " .. target:name())
+        local projectdir = target:extraconf("rules", "library.headeronly.distribute.header", "projectdir")
+        local outputdir = path.join(os.projectdir(), "distribute", "include")
+        if has_config("shipping_one") then
+            for _, filepath in ipairs(os.files(path.join(projectdir, "**", "*.h"))) do 
+                os.cp(filepath, outputdir)
+                print("Distributed header file: " .. path.filename(filepath))
             end
         end
     end)