diff --git a/build.sh b/build.sh
index 5a3b652..3b02b4d 100755
--- a/build.sh
+++ b/build.sh
@@ -1,16 +1,20 @@
-#!/bin/sh
+#!/usr/bin/env zsh
 
 set -E
+setopt extended_glob
 
-DIRS="
+DIRS=(
   syntax indent ftplugin ftdetect autoload compiler
   after/syntax after/indent after/ftplugin after/ftdetect
-"
+)
 
 copy_dir() {
   if [ -d "$1/$2" ]; then
-    mkdir -p "$2"
-    cp -r $1/$2/* $2/
+    for file in $(find "$1/$2" -name '*.vim'); do
+      file_path="$(dirname "${file##$1/}")"
+      mkdir -p "$file_path"
+      cp $file $file_path/
+    done
   fi
 }
 
diff --git a/ftplugin/go/test.sh b/ftplugin/go/test.sh
deleted file mode 100755
index d8a5b89..0000000
--- a/ftplugin/go/test.sh
+++ /dev/null
@@ -1,78 +0,0 @@
-#!/bin/bash -e
-#
-# Copyright 2012 The Go Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
-#
-# Tests for import.vim.
-
-cd $(dirname $0)
-
-cat > base.go <<EOF
-package test
-
-import (
-	"bytes"
-	"io"
-	"net"
-
-	"mycorp/foo"
-)
-EOF
-
-fail=0
-
-# usage: test_one command pattern
-# Pattern is a PCRE expression that will match across lines.
-test_one() {
-  echo 2>&1 -n "$1: "
-  vim -e -s -u /dev/null -U /dev/null --noplugin -c "source import.vim" \
-    -c "$1" -c 'wq! test.go' base.go
-  # ensure blank lines are treated correctly
-  if ! gofmt test.go | cmp test.go -; then
-    echo 2>&1 "gofmt conflict"
-    gofmt test.go | diff -u test.go - | sed "s/^/	/" 2>&1
-    fail=1
-    return
-  fi
-  if ! [[ $(cat test.go) =~ $2 ]]; then
-    echo 2>&1 "$2 did not match"
-    cat test.go | sed "s/^/	/" 2>&1
-    fail=1
-    return
-  fi
-  echo 2>&1 "ok"
-}
-
-# Tests for Import
-
-test_one "Import baz" '"baz".*"bytes"'
-test_one "Import io/ioutil" '"io".*"io/ioutil".*"net"'
-test_one "Import myc" '"io".*"myc".*"net"'  # prefix of a site prefix
-test_one "Import nat" '"io".*"nat".*"net"'
-test_one "Import net/http" '"net".*"net/http".*"mycorp/foo"'
-test_one "Import zoo" '"net".*"zoo".*"mycorp/foo"'
-test_one "Import mycorp/bar" '"net".*"mycorp/bar".*"mycorp/foo"'
-test_one "Import mycorp/goo" '"net".*"mycorp/foo".*"mycorp/goo"'
-
-# Tests for Drop
-
-cat > base.go <<EOF
-package test
-
-import (
-	"foo"
-
-	"something"
-	"zoo"
-)
-EOF
-
-test_one "Drop something" '\([^"]*"foo"[^"]*"zoo"[^"]*\)'
-
-rm -f base.go test.go
-if [ $fail -gt 0 ]; then
-  echo 2>&1 "FAIL"
-  exit 1
-fi
-echo 2>&1 "PASS"