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// 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 base
import (
"os"
"path/filepath"
"runtime"
"strings"
"sync"
)
var cwd string
var cwdOnce sync.Once
// UncachedCwd returns the current working directory.
// Most callers should use Cwd, which caches the result for future use.
// UncachedCwd is appropriate to call early in program startup before flag parsing,
// because the -C flag may change the current directory.
func UncachedCwd() string {
wd, err := os.Getwd()
if err != nil {
Fatalf("cannot determine current directory: %v", err)
}
return wd
}
// Cwd returns the current working directory at the time of the first call.
func Cwd() string {
cwdOnce.Do(func() {
cwd = UncachedCwd()
})
return cwd
}
// ShortPath returns an absolute or relative name for path, whatever is shorter.
func ShortPath(path string) string {
if rel, err := filepath.Rel(Cwd(), path); err == nil && len(rel) < len(path) {
return rel
}
return path
}
// RelPaths returns a copy of paths with absolute paths
// made relative to the current directory if they would be shorter.
func RelPaths(paths []string) []string {
var out []string
for _, p := range paths {
rel, err := filepath.Rel(Cwd(), p)
if err == nil && len(rel) < len(p) {
p = rel
}
out = append(out, p)
}
return out
}
// IsTestFile reports whether the source file is a set of tests and should therefore
// be excluded from coverage analysis.
func IsTestFile(file string) bool {
// We don't cover tests, only the code they test.
return strings.HasSuffix(file, "_test.go")
}
// IsNull reports whether the path is a common name for the null device.
// It returns true for /dev/null on Unix, or NUL (case-insensitive) on Windows.
func IsNull(path string) bool {
if path == os.DevNull {
return true
}
if runtime.GOOS == "windows" {
if strings.EqualFold(path, "NUL") {
return true
}
}
return false
}