Adding modding folder with a hacked build.

modding/hacked/ss1/world/FileLocation.go

@@ -0,0 +1,48 @@
+package world
+
+import (
+	"path/filepath"
+	"strings"
+)
+
+// FileLocation describes the path and name of a file.
+type FileLocation struct {
+	DirPath string
+	Name    string
+}
+
+// FileLocationFrom returns an instance for given filename.
+func FileLocationFrom(filename string) FileLocation {
+	return FileLocation{
+		DirPath: filepath.Dir(filename),
+		Name:    filepath.Base(filename),
+	}
+}
+
+// AbsolutePathFrom returns the complete path, based on given base, of the location.
+func (loc FileLocation) AbsolutePathFrom(base string) string {
+	rel, err := filepath.Rel(base, loc.DirPath)
+	if err != nil {
+		if filepath.IsAbs(loc.DirPath) {
+			return filepath.Join(loc.DirPath, loc.Name)
+		}
+		return filepath.Join(base, loc.DirPath, loc.Name)
+	}
+	return filepath.Join(base, rel, loc.Name)
+}
+
+// NestedRelativeTo returns a string that describes the relative nested location to given base - if possible.
+func (loc FileLocation) NestedRelativeTo(base string) string {
+	absoluteDir := loc.DirPath
+	if !filepath.IsAbs(absoluteDir) {
+		absoluteDir = filepath.Clean(filepath.Join(base, loc.DirPath))
+	}
+	if !strings.HasPrefix(absoluteDir+string(filepath.Separator), base+string(filepath.Separator)) {
+		return filepath.Join(absoluteDir, loc.Name)
+	}
+	rel, err := filepath.Rel(base, absoluteDir)
+	if err != nil {
+		return filepath.Join(base, loc.Name)
+	}
+	return filepath.Join(".", rel, loc.Name)
+}