pkg/path/testdata: stage filepath files from Go

As we are going to support functions for all OSes, we
cannot rely on the current Go API. We copy the
implementation and modify.

This is a simple copy from tip in 1.15.
Modifications are done in followup CLs and files
will eventually be moved to pkg/path after
modifications.

Change-Id: I8f0feffab6c711ae78a1c6b63e370229a9e7cbe1
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/7843
Reviewed-by: Marcel van Lohuizen <[email protected]>

Author: mpvl

pkg/path/testdata/example_test.go

@@ -0,0 +1,20 @@
+// Copyright 2017 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.
+
+package filepath_test
+
+import (
+	"fmt"
+	"path/filepath"
+)
+
+func ExampleExt() {
+	fmt.Printf("No dots: %q\n", filepath.Ext("index"))
+	fmt.Printf("One dot: %q\n", filepath.Ext("index.js"))
+	fmt.Printf("Two dots: %q\n", filepath.Ext("main.test.js"))
+	// Output:
+	// No dots: ""
+	// One dot: ".js"
+	// Two dots: ".js"
+}

pkg/path/testdata/example_unix_test.go

@@ -0,0 +1,171 @@
+// Copyright 2013 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.
+
+// +build !windows,!plan9
+
+package filepath_test
+
+import (
+	"fmt"
+	"path/filepath"
+)
+
+func ExampleSplitList() {
+	fmt.Println("On Unix:", filepath.SplitList("/a/b/c:/usr/bin"))
+	// Output:
+	// On Unix: [/a/b/c /usr/bin]
+}
+
+func ExampleRel() {
+	paths := []string{
+		"/a/b/c",
+		"/b/c",
+		"./b/c",
+	}
+	base := "/a"
+
+	fmt.Println("On Unix:")
+	for _, p := range paths {
+		rel, err := filepath.Rel(base, p)
+		fmt.Printf("%q: %q %v\n", p, rel, err)
+	}
+
+	// Output:
+	// On Unix:
+	// "/a/b/c": "b/c" <nil>
+	// "/b/c": "../b/c" <nil>
+	// "./b/c": "" Rel: can't make ./b/c relative to /a
+}
+
+func ExampleSplit() {
+	paths := []string{
+		"/home/arnie/amelia.jpg",
+		"/mnt/photos/",
+		"rabbit.jpg",
+		"/usr/local//go",
+	}
+	fmt.Println("On Unix:")
+	for _, p := range paths {
+		dir, file := filepath.Split(p)
+		fmt.Printf("input: %q\n\tdir: %q\n\tfile: %q\n", p, dir, file)
+	}
+	// Output:
+	// On Unix:
+	// input: "/home/arnie/amelia.jpg"
+	// 	dir: "/home/arnie/"
+	// 	file: "amelia.jpg"
+	// input: "/mnt/photos/"
+	// 	dir: "/mnt/photos/"
+	// 	file: ""
+	// input: "rabbit.jpg"
+	// 	dir: ""
+	// 	file: "rabbit.jpg"
+	// input: "/usr/local//go"
+	// 	dir: "/usr/local//"
+	// 	file: "go"
+}
+
+func ExampleJoin() {
+	fmt.Println("On Unix:")
+	fmt.Println(filepath.Join("a", "b", "c"))
+	fmt.Println(filepath.Join("a", "b/c"))
+	fmt.Println(filepath.Join("a/b", "c"))
+	fmt.Println(filepath.Join("a/b", "/c"))
+
+	fmt.Println(filepath.Join("a/b", "../../../xyz"))
+
+	// Output:
+	// On Unix:
+	// a/b/c
+	// a/b/c
+	// a/b/c
+	// a/b/c
+	// ../xyz
+}
+
+func ExampleMatch() {
+	fmt.Println("On Unix:")
+	fmt.Println(filepath.Match("/home/catch/*", "/home/catch/foo"))
+	fmt.Println(filepath.Match("/home/catch/*", "/home/catch/foo/bar"))
+	fmt.Println(filepath.Match("/home/?opher", "/home/gopher"))
+	fmt.Println(filepath.Match("/home/\\*", "/home/*"))
+
+	// Output:
+	// On Unix:
+	// true <nil>
+	// false <nil>
+	// true <nil>
+	// true <nil>
+}
+
+func ExampleBase() {
+	fmt.Println("On Unix:")
+	fmt.Println(filepath.Base("/foo/bar/baz.js"))
+	fmt.Println(filepath.Base("/foo/bar/baz"))
+	fmt.Println(filepath.Base("/foo/bar/baz/"))
+	fmt.Println(filepath.Base("dev.txt"))
+	fmt.Println(filepath.Base("../todo.txt"))
+	fmt.Println(filepath.Base(".."))
+	fmt.Println(filepath.Base("."))
+	fmt.Println(filepath.Base("/"))
+	fmt.Println(filepath.Base(""))
+
+	// Output:
+	// On Unix:
+	// baz.js
+	// baz
+	// baz
+	// dev.txt
+	// todo.txt
+	// ..
+	// .
+	// /
+	// .
+}
+
+func ExampleDir() {
+	fmt.Println("On Unix:")
+	fmt.Println(filepath.Dir("/foo/bar/baz.js"))
+	fmt.Println(filepath.Dir("/foo/bar/baz"))
+	fmt.Println(filepath.Dir("/foo/bar/baz/"))
+	fmt.Println(filepath.Dir("/dirty//path///"))
+	fmt.Println(filepath.Dir("dev.txt"))
+	fmt.Println(filepath.Dir("../todo.txt"))
+	fmt.Println(filepath.Dir(".."))
+	fmt.Println(filepath.Dir("."))
+	fmt.Println(filepath.Dir("/"))
+	fmt.Println(filepath.Dir(""))
+
+	// Output:
+	// On Unix:
+	// /foo/bar
+	// /foo/bar
+	// /foo/bar/baz
+	// /dirty/path
+	// .
+	// ..
+	// .
+	// .
+	// /
+	// .
+}
+
+func ExampleIsAbs() {
+	fmt.Println("On Unix:")
+	fmt.Println(filepath.IsAbs("/home/gopher"))
+	fmt.Println(filepath.IsAbs(".bashrc"))
+	fmt.Println(filepath.IsAbs(".."))
+	fmt.Println(filepath.IsAbs("."))
+	fmt.Println(filepath.IsAbs("/"))
+	fmt.Println(filepath.IsAbs(""))
+
+	// Output:
+	// On Unix:
+	// true
+	// false
+	// false
+	// false
+	// true
+	// false
+}

pkg/path/testdata/example_unix_walk_test.go

@@ -0,0 +1,67 @@
+// Copyright 2018 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.
+
+// +build !windows,!plan9
+
+package filepath_test
+
+import (
+	"fmt"
+	"io/fs"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+func prepareTestDirTree(tree string) (string, error) {
+	tmpDir, err := ioutil.TempDir("", "")
+	if err != nil {
+		return "", fmt.Errorf("error creating temp directory: %v\n", err)
+	}
+
+	err = os.MkdirAll(filepath.Join(tmpDir, tree), 0755)
+	if err != nil {
+		os.RemoveAll(tmpDir)
+		return "", err
+	}
+
+	return tmpDir, nil
+}
+
+func ExampleWalk() {
+	tmpDir, err := prepareTestDirTree("dir/to/walk/skip")
+	if err != nil {
+		fmt.Printf("unable to create test dir tree: %v\n", err)
+		return
+	}
+	defer os.RemoveAll(tmpDir)
+	os.Chdir(tmpDir)
+
+	subDirToSkip := "skip"
+
+	fmt.Println("On Unix:")
+	err = filepath.Walk(".", func(path string, info fs.FileInfo, err error) error {
+		if err != nil {
+			fmt.Printf("prevent panic by handling failure accessing a path %q: %v\n", path, err)
+			return err
+		}
+		if info.IsDir() && info.Name() == subDirToSkip {
+			fmt.Printf("skipping a dir without errors: %+v \n", info.Name())
+			return filepath.SkipDir
+		}
+		fmt.Printf("visited file or dir: %q\n", path)
+		return nil
+	})
+	if err != nil {
+		fmt.Printf("error walking the path %q: %v\n", tmpDir, err)
+		return
+	}
+	// Output:
+	// On Unix:
+	// visited file or dir: "."
+	// visited file or dir: "dir"
+	// visited file or dir: "dir/to"
+	// visited file or dir: "dir/to/walk"
+	// skipping a dir without errors: skip
+}

pkg/path/testdata/export_test.go

@@ -0,0 +1,7 @@
+// Copyright 2013 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.
+
+package filepath
+
+var LstatP = &lstat

pkg/path/testdata/export_windows_test.go

@@ -0,0 +1,10 @@
+// Copyright 2016 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.
+
+package filepath
+
+var (
+	ToNorm   = toNorm
+	NormBase = normBase
+)