revert languages for template

Author: waruqi

xmake/actions/create/template.lua

@@ -139,13 +139,19 @@ function replace_variables_in_files(files, vars)
 end
 
 -- get all languages from templates
---
--- scanning template roots to detect languages is too slow, and the language module list does not fully match template language names,
--- so we hardcode it here for better performance.
 function languages()
-    return {"c", "c++", "cuda", "dlang", "fortran", "go",
-        "kotlin", "nim", "objc", "objc++", "pascal",
-        "rust", "swift", "vala", "zig"}
+    local found = hashset.new()
+    for _, rootdir in ipairs(rootdirs()) do
+        local languages_dirs = os.dirs(path.join(rootdir, "*"))
+        if languages_dirs then
+            for _, d in ipairs(languages_dirs) do
+                found:insert(path.filename(d))
+            end
+        end
+    end
+    local results = found:to_array()
+    table.sort(results)
+    return results
 end
 
 -- get all templates for the given language