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package cli
import (
"bytes"
"fmt"
"io"
"sync"
)
// NewMockUi returns a fully initialized MockUi instance
// which is safe for concurrent use.
func NewMockUi() *MockUi {
m := new(MockUi)
m.once.Do(m.init)
return m
}
// MockUi is a mock UI that is used for tests and is exported publicly
// for use in external tests if needed as well. Do not instantite this
// directly since the buffers will be initialized on the first write. If
// there is no write then you will get a nil panic. Please use the
// NewMockUi() constructor function instead. You can fix your code with
//
// sed -i -e 's/new(cli.MockUi)/cli.NewMockUi()/g' *_test.go
type MockUi struct {
InputReader io.Reader
ErrorWriter *syncBuffer
OutputWriter *syncBuffer
once sync.Once
}
func (u *MockUi) Ask(query string) (string, error) {
u.once.Do(u.init)
var result string
fmt.Fprint(u.OutputWriter, query)
if _, err := fmt.Fscanln(u.InputReader, &result); err != nil {
return "", err
}
return result, nil
}
func (u *MockUi) AskSecret(query string) (string, error) {
return u.Ask(query)
}
func (u *MockUi) Error(message string) {
u.once.Do(u.init)
fmt.Fprint(u.ErrorWriter, message)
fmt.Fprint(u.ErrorWriter, "\n")
}
func (u *MockUi) Info(message string) {
u.Output(message)
}
func (u *MockUi) Output(message string) {
u.once.Do(u.init)
fmt.Fprint(u.OutputWriter, message)
fmt.Fprint(u.OutputWriter, "\n")
}
func (u *MockUi) Warn(message string) {
u.once.Do(u.init)
fmt.Fprint(u.ErrorWriter, message)
fmt.Fprint(u.ErrorWriter, "\n")
}
func (u *MockUi) init() {
u.ErrorWriter = new(syncBuffer)
u.OutputWriter = new(syncBuffer)
}
type syncBuffer struct {
sync.RWMutex
b bytes.Buffer
}
func (b *syncBuffer) Write(data []byte) (int, error) {
b.Lock()
defer b.Unlock()
return b.b.Write(data)
}
func (b *syncBuffer) Read(data []byte) (int, error) {
b.RLock()
defer b.RUnlock()
return b.b.Read(data)
}
func (b *syncBuffer) Reset() {
b.Lock()
b.b.Reset()
b.Unlock()
}
func (b *syncBuffer) String() string {
return string(b.Bytes())
}
func (b *syncBuffer) Bytes() []byte {
b.RLock()
data := b.b.Bytes()
b.RUnlock()
return data
}
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