github.com/oweisse/u-root@v0.0.0-20181109060735-d005ad25fef1/cmds/elvish/eval/chdir.go (about)

     1  package eval
     2  
     3  import (
     4  	"os"
     5  )
     6  
     7  // AddDirer wraps the AddDir function.
     8  type AddDirer interface {
     9  	// AddDir adds a directory with the given weight to some storage.
    10  	AddDir(dir string, weight float64) error
    11  }
    12  
    13  // Chdir changes the current directory. On success it also updates the PWD
    14  // environment variable and records the new directory in the directory history.
    15  // It runs the functions in beforeChdir immediately before changing the
    16  // directory, and the functions in afterChdir immediately after (if chdir was
    17  // successful). It returns nil as long as the directory changing part succeeds.
    18  func (ev *Evaler) Chdir(path string) error {
    19  	for _, hook := range ev.beforeChdir {
    20  		hook(path)
    21  	}
    22  
    23  	err := os.Chdir(path)
    24  	if err != nil {
    25  		return err
    26  	}
    27  
    28  	for _, hook := range ev.afterChdir {
    29  		hook(path)
    30  	}
    31  
    32  	pwd, err := os.Getwd()
    33  	if err != nil {
    34  		logger.Println("getwd after cd:", err)
    35  		return nil
    36  	}
    37  	os.Setenv("PWD", pwd)
    38  
    39  	return nil
    40  }