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package main
import (
"bufio"
"fmt"
"os/exec"
"syscall"
tui "github.com/grindlemire/go-tui"
"github.com/grindlemire/go-tui/examples/ai-chat/settings"
)
type chat struct {
app *tui.App
width int
textareaRef *tui.Ref
showSettings *tui.State[bool]
settingsView *settings.SettingsApp
streaming *tui.State[bool]
eventCh chan streamEvent
streamWriter *tui.StreamWriter
cmd *exec.Cmd
firstMsg bool
// settings state (shared with settings view)
model *tui.State[string]
maxTurns *tui.State[int]
permissionMode *tui.State[string]
systemPrompt *tui.State[string]
}
func Chat(width int) *chat {
c := &chat{
width: width,
textareaRef: tui.NewRef(),
showSettings: tui.NewState(false),
streaming: tui.NewState(false),
eventCh: make(chan streamEvent, 64),
firstMsg: true,
}
c.model = tui.NewState("sonnet")
c.maxTurns = tui.NewState(25)
c.permissionMode = tui.NewState("default")
c.systemPrompt = tui.NewState("You are a helpful assistant.")
c.settingsView = settings.NewSettingsApp(
c.model,
c.maxTurns,
c.permissionMode,
c.systemPrompt,
c.toggleSettings,
)
return c
}
func (c *chat) Init() func() {
return func() {
c.cancelStream()
}
}
func (c *chat) ta() *tui.TextArea {
return tui.RefComponent[*tui.TextArea](c.textareaRef)
}
func (c *chat) submit(text string) {
if text == "" || c.streaming.Get() {
return
}
if ta := c.ta(); ta != nil {
ta.Clear()
}
c.updateHeight()
c.app.PrintAboveln("You: %s", text)
c.streaming.Set(true)
c.startClaude(text)
}
func (c *chat) startClaude(message string) {
args := []string{"-p", message, "--output-format", "stream-json", "--verbose", "--include-partial-messages"}
if !c.firstMsg {
args = append(args, "--continue")
}
c.firstMsg = false
args = append(args, "--model", c.model.Get())
if mt := c.maxTurns.Get(); mt > 0 {
args = append(args, "--max-turns", fmt.Sprintf("%d", mt))
}
if pm := c.permissionMode.Get(); pm != "default" {
args = append(args, "--permission-mode", pm)
}
if sp := c.systemPrompt.Get(); sp != "" {
args = append(args, "--append-system-prompt", sp)
}
cmd := exec.Command("claude", args...)
stdout, err := cmd.StdoutPipe()
if err != nil {
c.eventCh <- streamEvent{Type: eventError, Text: fmt.Sprintf("pipe error: %v", err)}
return
}
if err := cmd.Start(); err != nil {
c.eventCh <- streamEvent{Type: eventError, Text: fmt.Sprintf("start error: %v", err)}
return
}
c.cmd = cmd
go func() {
parser := newStreamParser()
scanner := bufio.NewScanner(stdout)
scanner.Buffer(make([]byte, 0, 256*1024), 256*1024)
for scanner.Scan() {
for _, ev := range parser.parseLine(scanner.Bytes()) {
c.eventCh <- ev
}
}
cmd.Wait()
c.eventCh <- streamEvent{Type: eventDone}
}()
}
var agentGradient = tui.NewGradient(tui.BrightCyan, tui.BrightMagenta)
func (c *chat) closeStream() {
if c.streamWriter != nil {
c.streamWriter.Close()
c.streamWriter = nil
}
}
func (c *chat) onStreamEvent(ev streamEvent) {
switch ev.Type {
case eventText:
if c.streamWriter == nil {
c.streamWriter = c.app.StreamAbove()
}
c.streamWriter.WriteGradient(ev.Text, agentGradient)
case eventToolUse:
c.closeStream()
toolWriter := c.app.StreamAbove()
toolWriter.WriteGradient(" > "+ev.Text+"\n", agentGradient)
toolWriter.Close()
case eventError:
c.closeStream()
c.app.PrintAboveln("Error: %s", ev.Text)
c.streaming.Set(false)
c.cmd = nil
case eventDone:
c.closeStream()
c.app.PrintAboveln("")
c.streaming.Set(false)
c.cmd = nil
}
}
func (c *chat) cancelStream() {
c.closeStream()
if c.cmd != nil && c.cmd.Process != nil {
c.cmd.Process.Signal(syscall.SIGTERM)
}
}
func (c *chat) toggleSettings() {
if c.streaming.Get() {
return
}
if c.showSettings.Get() {
_ = c.app.ExitAlternateScreen()
c.showSettings.Set(false)
c.updateHeight()
return
}
c.showSettings.Set(true)
_ = c.app.EnterAlternateScreen()
}
func (c *chat) KeyMap() tui.KeyMap {
if c.showSettings.Get() {
km := c.settingsView.KeyMap()
km = append(km,
tui.On(tui.Rune('c').Ctrl(), func(ke tui.KeyEvent) { ke.App().Stop() }),
)
return km
}
// While streaming, only allow Ctrl+C (kills subprocess) and Escape
if c.streaming.Get() {
return tui.KeyMap{
tui.OnStop(tui.Rune('c').Ctrl(), func(ke tui.KeyEvent) { c.cancelStream(); ke.App().Stop() }),
tui.OnStop(tui.KeyEscape, func(ke tui.KeyEvent) { c.cancelStream() }),
}
}
return tui.KeyMap{
tui.OnStop(tui.Rune('s').Ctrl(), func(ke tui.KeyEvent) { c.toggleSettings() }),
tui.OnStop(tui.KeyEscape, func(ke tui.KeyEvent) { ke.App().Stop() }),
tui.On(tui.Rune('c').Ctrl(), func(ke tui.KeyEvent) { ke.App().Stop() }),
}
}
func (c *chat) Watchers() []tui.Watcher {
return []tui.Watcher{
tui.NewChannelWatcher(c.eventCh, c.onStreamEvent),
}
}
func (c *chat) updateHeight() {
h := 3
if ta := c.ta(); ta != nil {
h = ta.Height()
if h < 3 {
h = 3
}
}
c.app.SetInlineHeight(h)
}
templ (c *chat) Render() {
if c.showSettings.Get() {
@c.settingsView
} else {
c.updateHeight()
<textarea
ref={c.textareaRef}
autoFocus={true}
placeholder="Type a message..."
width={c.width - 2}
border={tui.BorderRounded}
onSubmit={c.submit}
/>
}
}
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