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// Copyright 2012, 2013 Canonical Ltd.
// Licensed under the LGPLv3, see LICENSE file for details.
package cmd
import (
"errors"
"io"
"io/ioutil"
"os"
)
// FileVar represents a path to a file.
type FileVar struct {
// Path is the path to the file.
Path string
// StdinMarkers are the Path values that should be interpreted as
// stdin. If it is empty then stdin is not supported.
StdinMarkers []string
}
var ErrNoPath = errors.New("path not set")
// Set stores the chosen path name in f.Path.
func (f *FileVar) Set(v string) error {
f.Path = v
return nil
}
// SetStdin sets StdinMarkers to the provided strings. If none are
// provided then the default of "-" is used.
func (f *FileVar) SetStdin(markers ...string) {
if len(markers) == 0 {
markers = append(markers, "-")
}
f.StdinMarkers = markers
}
// IsStdin determines whether or not the path represents stdin.
func (f FileVar) IsStdin() bool {
for _, marker := range f.StdinMarkers {
if f.Path == marker {
return true
}
}
return false
}
// Open opens the file.
func (f *FileVar) Open(ctx *Context) (io.ReadCloser, error) {
if f.Path == "" {
return nil, ErrNoPath
}
if f.IsStdin() {
return ioutil.NopCloser(ctx.Stdin), nil
}
path, err := normalizePath(f.Path)
if err != nil {
return nil, err
}
return os.Open(ctx.AbsPath(path))
}
// Read returns the contents of the file.
func (f *FileVar) Read(ctx *Context) ([]byte, error) {
if f.Path == "" {
return nil, ErrNoPath
}
if f.IsStdin() {
return ioutil.ReadAll(ctx.Stdin)
}
path, err := normalizePath(f.Path)
if err != nil {
return nil, err
}
return ioutil.ReadFile(ctx.AbsPath(path))
}
// String returns the path to the file.
func (f *FileVar) String() string {
return f.Path
}
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