git-sizer: don't accept a repository path on the command line

Always use the current directory (or GIT_DIR, if it is set).

Author: mhagger

README.md

@@ -80,9 +80,9 @@ Is your Git repository bursting at the seams?
 
     *   On other platforms: TBD
 
-3.  Run:
+3.  Change to the directory containing the Git repository, then run
 
-        git sizer [<opt>...] [<path-to-git-repository>]
+        git sizer [<opt>...]
 
     To get a summary of the current repository, all you need is
 

git-sizer.go

@@ -107,19 +107,13 @@ func mainImplementation() error {
 
 	args := flag.Args()
 
-	var path string
-	switch len(args) {
-	case 0:
-		path = "."
-	case 1:
-		path = args[0]
-	default:
+	if len(args) != 0 {
 		return errors.New("excess arguments")
 	}
 
-	repo, err := sizes.NewRepository(path)
+	repo, err := sizes.NewRepository(".")
 	if err != nil {
-		return fmt.Errorf("couldn't open %v: %s", path, err)
+		return fmt.Errorf("couldn't open Git repository: %s", err)
 	}
 	defer repo.Close()