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input_test.go
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input_test.go
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package anansi_test
import (
"bytes"
"fmt"
"io"
"os"
"sync"
"syscall"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/jcorbin/anansi"
"github.com/jcorbin/anansi/ansi"
)
func TestInput_ReadMore(t *testing.T) {
type write struct {
d time.Duration
s string
}
type read struct {
n int
s string
}
for _, tc := range []struct {
name string
steps []write
expected []read
}{
{
name: "hello world",
steps: []write{
{time.Millisecond, "hello"},
{time.Millisecond, "world"},
},
expected: []read{
{5, "hello"},
{5, "world"},
},
},
{
name: "helloworld",
steps: []write{
{time.Millisecond, "hello"},
{0, "world"},
},
expected: []read{
{10, "helloworld"},
},
},
} {
t.Run(tc.name, func(t *testing.T) {
var wg sync.WaitGroup
defer wg.Wait()
r, w, err := os.Pipe()
require.NoError(t, err)
defer w.Close()
in := anansi.Input{File: r}
wg.Add(1)
go func() {
defer wg.Done()
defer r.Close()
var got bytes.Buffer
for i := 0; ; i++ {
var ex read
if i < len(tc.expected) {
ex = tc.expected[i]
}
t.Logf("r[%v] reading more", i)
n, err := in.ReadMore()
got.Reset()
slurpInput(&got, &in)
t.Logf("r[%v] got %v %q", i, err, got.String())
assert.Equal(t,
ex,
read{n, got.String()},
"[%v] expected read result", i)
// assert.Equal(t, ex.n, n, "[%v] expected number of bytes", i)
// assert.Equal(t, ex.s, got.String(), "[%v] expected string", i)
if err == io.EOF {
break
}
require.NoError(t, err, "[%v] unexpected read error", i)
}
}()
for i, step := range tc.steps {
if step.d > 0 {
t.Logf("w[%v] sleeping %v", i, step.d)
time.Sleep(step.d)
}
if len(step.s) > 0 {
t.Logf("w[%v] writing %q", i, step.s)
_, err = w.WriteString(step.s)
require.NoError(t, err, "[%v] failed to write string", i)
}
}
t.Logf("w[ ] closing")
require.NoError(t, w.Close(), "failed to close write pipe")
})
}
}
func slurpInput(buf *bytes.Buffer, in *anansi.Input) {
for {
if e, a, ok := in.Decode(); !ok {
break
} else if e.IsEscape() {
fmt.Fprintf(buf, "[ansi %v %q]", e, a)
} else {
buf.WriteRune(rune(e))
}
}
}
// Reading input in blocking mode, like a simple REPL-style program might.
//
// See cmd/decode/main.go for a more advanced example (including use of raw
// mode in addition to line-oriented as shown here).
func ExampleInput_blocking() {
term := anansi.NewTerm(os.Stdin, os.Stdout)
term.SetEcho(true)
anansi.MustRun(term.RunWith(func(term *anansi.Term) error {
for {
// process any (maybe partial) input first before stopping on error
_, err := term.ReadMore()
i := 0
for e, a, ok := term.Decode(); ok; e, a, ok = term.Decode() {
if !e.IsEscape() {
fmt.Printf("read[%v]: %q\n", i, rune(e))
} else if a != nil {
fmt.Printf("read[%v]: %v %q\n", i, e, a)
} else {
fmt.Printf("read[%v]: %v\n", i, e)
}
i++
}
if err != nil {
return err // likely io.EOF
}
}
}))
}
// Reading input in non-blocking mode 10 times a second, like an animated
// frame-rendering-loop program might.
func ExampleInput_nonblocking() {
// We need to handle these signals so that we restore terminal state
// properly (raw mode and exit the alternate screen).
halt := anansi.Notify(syscall.SIGTERM, syscall.SIGINT)
term := anansi.NewTerm(os.Stdin, os.Stdout, &halt)
// run in a dedicated fullscreen, and handle input as it comes in
term.SetRaw(true)
term.AddMode(ansi.ModeAlternateScreen)
anansi.MustRun(term.RunWith(func(term *anansi.Term) error {
for range time.Tick(time.Second / 10) {
// poll for halting signal before reading input
if err := halt.AsErr(); err != nil {
return err
}
// process any (maybe partial) input first before stopping on error
// NOTE the need for CR below since we're in raw mode
_, err := term.ReadAny()
i := 0
for e, a, ok := term.Decode(); ok; e, a, ok = term.Decode() {
if e == 0x03 {
return fmt.Errorf("read %v", e) // stop on Ctrl-C
} else if !e.IsEscape() {
fmt.Printf("read[%v]: %q\r\n", i, rune(e))
} else if a != nil {
fmt.Printf("read[%v]: %v %q\r\n", i, e, a)
} else {
fmt.Printf("read[%v]: %v\r\n", i, e)
}
i++
}
if err != nil {
return err // likely io.EOF
}
}
return nil
}))
}
// Reading input driven by asynchronous notifications (and doing so in the
// normative non-blocking way). This is another option for a fullscreen program
// when there's no need for an animation frame rendering loop or when input is
// processed independently from one.
func ExampleInput_nonblockingAsync() {
// We need to handle these signals so that we restore terminal state
// properly (raw mode and exit the alternate screen).
halt := anansi.Notify(syscall.SIGTERM, syscall.SIGINT)
term := anansi.NewTerm(os.Stdin, os.Stdout, &halt)
// run in a dedicated fullscreen, and handle input as it comes in
term.SetRaw(true)
term.AddMode(ansi.ModeAlternateScreen)
anansi.MustRun(term.RunWith(func(term *anansi.Term) error {
canRead := make(chan os.Signal, 1)
if err := term.Notify(canRead); err != nil {
return err
}
for {
select {
case sig := <-halt.C:
return anansi.SigErr(sig)
case <-canRead:
// process any (maybe partial) input first before stopping on error
// NOTE the need for CR below since we're in raw mode
_, err := term.ReadAny()
i := 0
for e, a, ok := term.Decode(); ok; e, a, ok = term.Decode() {
if e == 0x03 {
return fmt.Errorf("read %v", e) // stop on Ctrl-C
} else if !e.IsEscape() {
fmt.Printf("read[%v]: %q\r\n", i, rune(e))
} else if a != nil {
fmt.Printf("read[%v]: %v %q\r\n", i, e, a)
} else {
fmt.Printf("read[%v]: %v\r\n", i, e)
}
i++
}
if err != nil {
return err // likely io.EOF
}
}
}
}))
}