Improved scanner

src/global/global.go

@@ -0,0 +1,69 @@
+package global
+
+import (
+	"os"
+	"path/filepath"
+	"runtime/debug"
+)
+
+// Global variables that are useful in all packages.
+var (
+	Executable       string
+	Library          string
+	Root             string
+	WorkingDirectory string
+)
+
+// init is the very first thing that's executed.
+// It disables the GC and initializes global variables.
+func init() {
+	debug.SetGCPercent(-1)
+
+	var err error
+	Executable, err = os.Executable()
+
+	if err != nil {
+		panic(err)
+	}
+
+	Executable, err = filepath.EvalSymlinks(Executable)
+
+	if err != nil {
+		panic(err)
+	}
+
+	WorkingDirectory, err = os.Getwd()
+
+	if err != nil {
+		panic(err)
+	}
+
+	Root = filepath.Dir(Executable)
+	Library = filepath.Join(Root, "lib")
+	stat, err := os.Stat(Library)
+
+	if err != nil || !stat.IsDir() {
+		findLibrary()
+	}
+}
+
+// findLibrary tries to go up each directory from the working directory and check for the existence of a "lib" directory.
+// This is needed for tests to work correctly.
+func findLibrary() {
+	dir := WorkingDirectory
+
+	for {
+		Library = filepath.Join(dir, "lib")
+		stat, err := os.Stat(Library)
+
+		if err == nil && stat.IsDir() {
+			return
+		}
+
+		if dir == "/" {
+			panic("standard library not found")
+		}
+
+		dir = filepath.Dir(dir)
+	}
+}