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Source file src/os/exec/lp_windows.go

  // Copyright 2010 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 exec
  
  import (
  	"errors"
  	"os"
  	"path/filepath"
  	"strings"
  )
  
  // ErrNotFound is the error resulting if a path search failed to find an executable file.
  var ErrNotFound = errors.New("executable file not found in %PATH%")
  
  func chkStat(file string) error {
  	d, err := os.Stat(file)
  	if err != nil {
  		return err
  	}
  	if d.IsDir() {
  		return os.ErrPermission
  	}
  	return nil
  }
  
  func hasExt(file string) bool {
  	i := strings.LastIndex(file, ".")
  	if i < 0 {
  		return false
  	}
  	return strings.LastIndexAny(file, `:\/`) < i
  }
  
  func findExecutable(file string, exts []string) (string, error) {
  	if len(exts) == 0 {
  		return file, chkStat(file)
  	}
  	if hasExt(file) {
  		if chkStat(file) == nil {
  			return file, nil
  		}
  	}
  	for _, e := range exts {
  		if f := file + e; chkStat(f) == nil {
  			return f, nil
  		}
  	}
  	return "", os.ErrNotExist
  }
  
  // LookPath searches for an executable binary named file
  // in the directories named by the PATH environment variable.
  // If file contains a slash, it is tried directly and the PATH is not consulted.
  // LookPath also uses PATHEXT environment variable to match
  // a suitable candidate.
  // The result may be an absolute path or a path relative to the current directory.
  func LookPath(file string) (string, error) {
  	var exts []string
  	x := os.Getenv(`PATHEXT`)
  	if x != "" {
  		for _, e := range strings.Split(strings.ToLower(x), `;`) {
  			if e == "" {
  				continue
  			}
  			if e[0] != '.' {
  				e = "." + e
  			}
  			exts = append(exts, e)
  		}
  	} else {
  		exts = []string{".com", ".exe", ".bat", ".cmd"}
  	}
  
  	if strings.ContainsAny(file, `:\/`) {
  		if f, err := findExecutable(file, exts); err == nil {
  			return f, nil
  		} else {
  			return "", &Error{file, err}
  		}
  	}
  	if f, err := findExecutable(filepath.Join(".", file), exts); err == nil {
  		return f, nil
  	}
  	path := os.Getenv("path")
  	for _, dir := range filepath.SplitList(path) {
  		if f, err := findExecutable(filepath.Join(dir, file), exts); err == nil {
  			return f, nil
  		}
  	}
  	return "", &Error{file, ErrNotFound}
  }
  

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