Update Butterfish with `fish` shell compatibilitydarinkishore/butterfish#3

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ERROR
No changes were made due to the following error:

Could not find the old_code:
```
func (this *ButterfishCtx) SetPS1(childIn io.Writer) {
	shell := this.Config.ParseShell()
	var ps1 string

	switch shell {
	case "bash", "sh":
		// the \\[ and \\] are bash-specific and tell bash to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "PS1=$'\\[%s\\]'$PS1$'%s\\[ $?%s\\] '\n"
	case "zsh":
		// the %%{ and %%} are zsh-specific and tell zsh to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "PS1=$'%%{%s%%}'$PS1$'%s%%{ %%?%s%%} '\n"
```
In section 20, which has code:
```
func (this *ButterfishCtx) SetPS1(childIn io.Writer) {
	shell := this.Config.ParseShell()
	var ps1 string

	switch shell {
	case "bash", "sh":
		// the \[ and \] are bash-specific and tell bash to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "PS1=$'\\[%s\\]'$PS1$'%s\\[ $?%s\\] '\n"
	case "zsh":
		// the %%{ and %%} are zsh-specific and tell zsh to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "PS1=$'%%{%s%%}'$PS1$'%s%%{ %%?%s%%} '\n"
```

Double-check your indentation and spelling, and make sure there's no missing whitespace or comments.

__No output__

ERROR
No changes were made due to the following error:

Could not find the old_code:
```
		log.Printf("Unknown shell %s, Butterfish is going to leave the PS1 alone. This means that you won't get a custom prompt in Butterfish, and Butterfish won't be able to parse the exit code of the previous command, used for certain features. Create an issue at https://github.com/bakks/butterfish.", shell)
		return
```
In section 20, which has code:
```
func (this *ButterfishCtx) SetPS1(childIn io.Writer) {
	shell := this.Config.ParseShell()
	var ps1 string

	switch shell {
	case "bash", "sh":
		// the \[ and \] are bash-specific and tell bash to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "PS1=$'\\[%s\\]'$PS1$'%s\\[ $?%s\\] '\n"
	case "zsh":
		// the %%{ and %%} are zsh-specific and tell zsh to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "PS1=$'%%{%s%%}'$PS1$'%s%%{ %%?%s%%} '\n"
	case "fish":
		// the \e[ and \e] are fish-specific and tell fish to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "set -U fish_prompt \\e[%s\\e]$fish_prompt$'%s\\e[ $?%s\\e] '\n"
```

Did you mean one of the following sections?
<section id="V">
	default:
		log.Printf("Unknown shell %s, Butterfish is going to leave the PS1 alone. This means that you won't get a custom prompt in Butterfish, and Butterfish won't be able to parse the exit code of the previous command, used for certain features. Create an issue at https://github.com/bakks/butterfish.", shell)
		return
</section>
```

SUCCESS
Here are the new code sections:

The following changes have been applied:
```diff
--- 
+++ 
@@ -479,7 +479,7 @@
 		// characters when calculating the cursor position
 		ps1 = "set -U fish_prompt \\e[%s\\e]$fish_prompt$'%s\\e[ $?%s\\e] '\n"
 	default:
-		log.Printf("Unknown shell %s, Butterfish is going to leave the PS1 alone. This means that you won't get a custom prompt in Butterfish, and Butterfish won't be able to parse the exit code of the previous command, used for certain features. Create an issue at https://github.com/bakks/butterfish.", shell)
+		log.Printf("Shell not supported: %s. Butterfish relies on being able to parse the PS1 variable and uses it heavily internally for features like autosuggestions and catching the return status. If your shell isn't supported consider filing an issue at https://github.com/bakks/butterfish.", shell)
 		return
 	}
 

```
Here are the new code sections:



# Code
File path:/tmp/cache/repos/darinkishore/butterfish/1fb098d9f0db5678163f01c68dff89d8e1cef3ca92688814dcad2f63cb86a8ec/main/butterfish/shell.go
<sections>

<section id="A">
package butterfish

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"os"
	"os/signal"
	"regexp"
	"strconv"
	"strings"
	"sync"
	"syscall"
	"time"
	"unicode"

	"github.com/bakks/butterfish/prompt"
	"github.com/bakks/butterfish/util"
	"github.com/sashabaranov/go-openai/jsonschema"

	"github.com/bakks/tiktoken-go"
	"github.com/mitchellh/go-ps"
	"golang.org/x/term"
)

const ESC_CUP = "\x1b[6n" // Request the cursor position
const ESC_UP = "\x1b[%dA"
const ESC_RIGHT = "\x1b[%dC"
const ESC_LEFT = "\x1b[%dD"
const ESC_CLEAR = "\x1b[0K"
const CLEAR_COLOR = "\x1b[0m"

// Special characters that we wrap the shell's command prompt in (PS1) so
</section id="A">
<section id="B">
// that we can detect where it starts and ends.
const PROMPT_PREFIX = "\033Q"
const PROMPT_SUFFIX = "\033R"
const PROMPT_PREFIX_ESCAPED = "\\033Q"
const PROMPT_SUFFIX_ESCAPED = "\\033R"
const EMOJI_DEFAULT = "🐠"
const EMOJI_GOAL = "🟦"
const EMOJI_GOAL_UNSAFE = "⚡"

var ps1Regex = regexp.MustCompile(" ([0-9]+)" + PROMPT_SUFFIX)
var ps1FullRegex = regexp.MustCompile(EMOJI_DEFAULT + " ([0-9]+)" + PROMPT_SUFFIX)

</section id="B">
<section id="C">
var DarkShellColorScheme = &ShellColorScheme{
	Prompt:           "\x1b[38;5;154m",
	PromptGoal:       "\x1b[38;5;200m",
	PromptGoalUnsafe: "\x1b[38;5;9m",
	Command:          "\x1b[0m",
	Autosuggest:      "\x1b[38;5;241m",
	Answer:           "\x1b[38;5;178m",
	GoalMode:         "\x1b[38;5;51m",
	Error:            "\x1b[38;5;196m",
}

var LightShellColorScheme = &ShellColorScheme{
	Prompt:           "\x1b[38;5;28m",
	PromptGoal:       "\x1b[38;5;200m",
	PromptGoalUnsafe: "\x1b[38;5;9m",
	Command:          "\x1b[0m",
	Autosuggest:      "\x1b[38;5;241m",
	Answer:           "\x1b[38;5;178m",
	GoalMode:         "\x1b[38;5;18m",
	Error:            "\x1b[38;5;196m",
}

</section id="C">
<section id="D">
func RunShell(ctx context.Context, config *ButterfishConfig) error {
	envVars := []string{"BUTTERFISH_SHELL=1"}

	ptmx, ptyCleanup, err := ptyCommand(ctx, envVars, []string{config.ShellBinary})
	if err != nil {
		return err
	}
	defer ptyCleanup()

	bf, err := NewButterfish(ctx, config)
	if err != nil {
		return err
	}
	//fmt.Println("Starting butterfish shell")

	bf.ShellMultiplexer(ptmx, ptmx, os.Stdin, os.Stdout)
	return nil
}

const (
	historyTypePrompt = iota
	historyTypeShellInput
	historyTypeShellOutput
	historyTypeLLMOutput
	historyTypeFunctionOutput
	historyTypeToolOutput
)

// Turn history type enum to a string
</section id="D">
<section id="E">
func HistoryTypeToString(historyType int) string {
	switch historyType {
	case historyTypePrompt:
		return "Prompt"
	case historyTypeShellInput:
		return "Shell Input"
	case historyTypeShellOutput:
		return "Shell Output"
	case historyTypeLLMOutput:
		return "LLM Output"
	case historyTypeFunctionOutput:
		return "Function Output"
	default:
		return "Unknown"
	}
}

type Tokenization struct {
	InputLength int    // the unprocessed length of the pretokenized plus truncated content
	NumTokens   int    // number of tokens in the data
	Data        string // tokenized and truncated content
}

// HistoryBuffer keeps a content buffer, plus an enum of the type of content
</section id="E">
<section id="F">
// (user prompt, shell output, etc), plus a cache of tokenizations of the
// content. Tokenizations are cached for specific encodings, for example
// newer models use a different encoding than older models.
type HistoryBuffer struct {
	Type           int
	Content        *ShellBuffer
	FunctionName   string
	FunctionParams string

	// This is to cache tokenization plus truncation of the content
	// It maps from encoding name to the tokenization of the output
	Tokenizations map[string]Tokenization
}

</section id="F">
<section id="G">
func (this *HistoryBuffer) SetTokenization(encoding string, inputLength int, numTokens int, data string) {
	if this.Tokenizations == nil {
		this.Tokenizations = make(map[string]Tokenization)
	}
	this.Tokenizations[encoding] = Tokenization{
		InputLength: inputLength,
		NumTokens:   numTokens,
		Data:        data,
	}
}

</section id="G">
<section id="H">
func (this *HistoryBuffer) GetTokenization(encoding string, length int) (string, int, bool) {
	if this.Tokenizations == nil {
		this.Tokenizations = make(map[string]Tokenization)
	}

	tokenization, ok := this.Tokenizations[encoding]
	if !ok {
		return "", 0, false
	}
	if tokenization.InputLength != length {
		return "", 0, false
	}
	return tokenization.Data, tokenization.NumTokens, true
}

// ShellHistory keeps a record of past shell history and LLM interaction in
// a slice of HistoryBuffer objects. You can add a new block, append to
// the last block, and get the the last n bytes of the history as an array of
// HistoryBlocks.
</section id="H">
<section id="I">
type ShellHistory struct {
	Blocks []*HistoryBuffer
	mutex  sync.Mutex
}

func NewShellHistory() *ShellHistory {
	return &ShellHistory{
		Blocks: make([]*HistoryBuffer, 0),
	}
}

func (this *ShellHistory) add(historyType int, block string) {
	buffer := NewShellBuffer()
	buffer.Write(block)
	this.Blocks = append(this.Blocks, &HistoryBuffer{
		Type:    historyType,
		Content: buffer,
	})
}

</section id="I">
<section id="J">
func (this *ShellHistory) Append(historyType int, data string) {
	this.mutex.Lock()
	defer this.mutex.Unlock()

	// if data is empty, we don't want to add a new block
	if len(data) == 0 {
		return
	}

	numBlocks := len(this.Blocks)
	// if we have a block already, and it matches the type, append to it
	if numBlocks > 0 {
		lastBlock := this.Blocks[numBlocks-1]

		if lastBlock.Type == historyType {
			lastBlock.Content.Write(data)
			return
		}
	}

	// if the history type doesn't match we fall through and add a new block
	this.add(historyType, data)
}

</section id="J">
<section id="K">
func (this *ShellHistory) AddFunctionCall(name, params string) {
	this.mutex.Lock()
	defer this.mutex.Unlock()

	this.Blocks = append(this.Blocks, &HistoryBuffer{
		Type:           historyTypeLLMOutput,
		FunctionName:   name,
		FunctionParams: params,
		Content:        NewShellBuffer(),
	})
}

</section id="K">
<section id="L">
func (this *ShellHistory) AppendFunctionOutput(name, data string) {
	this.mutex.Lock()
	defer this.mutex.Unlock()

	// if data is empty, we don't want to add a new block
	if len(data) == 0 {
		return
	}

	numBlocks := len(this.Blocks)
	var lastBlock *HistoryBuffer
	// if we have a block already, and it matches the type, append to it
	if numBlocks > 0 {
		lastBlock = this.Blocks[numBlocks-1]
		if lastBlock.Type == historyTypeFunctionOutput && lastBlock.FunctionName == name {
			lastBlock.Content.Write(data)
			return
		}
	}

	// if the history type doesn't match we fall through and add a new block
	this.add(historyTypeFunctionOutput, data)
	lastBlock = this.Blocks[numBlocks]
	lastBlock.FunctionName = name
</section id="L">
<section id="M">
}

// Go back in history for a certain number of bytes.
func (this *ShellHistory) GetLastNBytes(numBytes int, truncateLength int) []util.HistoryBlock {
	this.mutex.Lock()
	defer this.mutex.Unlock()

	var blocks []util.HistoryBlock

	for i := len(this.Blocks) - 1; i >= 0 && numBytes > 0; i-- {
		block := this.Blocks[i]
		content := sanitizeTTYString(block.Content.String())
		if len(content) > truncateLength {
			content = content[:truncateLength]
		}
		if len(content) > numBytes {
			break // we don't want a weird partial line so we bail out here
		}
		blocks = append(blocks, util.HistoryBlock{
			Type:    block.Type,
			Content: content,
		})
		numBytes -= len(content)
	}

	// reverse the blocks slice
	for i := len(blocks)/2 - 1; i >= 0; i-- {
		opp := len(blocks) - 1 - i
		blocks[i], blocks[opp] = blocks[opp], blocks[i]
	}

</section id="M">
<section id="N">
	return blocks
}

func (this *ShellHistory) IterateBlocks(cb func(block *HistoryBuffer) bool) {
	this.mutex.Lock()
	defer this.mutex.Unlock()

	for i := len(this.Blocks) - 1; i >= 0; i-- {
		cont := cb(this.Blocks[i])
		if !cont {
			break
		}
	}
}

// This is not thread safe
func (this *ShellHistory) LogRecentHistory() {
	blocks := this.GetLastNBytes(2000, 512)
	log.Printf("Recent history: =======================================")
	builder := strings.Builder{}
	for _, block := range blocks {
		builder.WriteString(fmt.Sprintf("%s: %s\n", HistoryTypeToString(block.Type), block.Content))
	}
	log.Printf(builder.String())
	log.Printf("=======================================")
}

</section id="N">
<section id="O">
func HistoryBlocksToString(blocks []util.HistoryBlock) string {
	var sb strings.Builder
	for i, block := range blocks {
		if i > 0 {
			sb.WriteString("\n")
		}
		sb.WriteString(block.Content)
	}
	return sb.String()
}

const (
	stateNormal = iota
	stateShell
	statePrompting
	statePromptResponse
)

var stateNames = []string{
	"Normal",
	"Shell",
	"Prompting",
	"PromptResponse",
}

type AutosuggestResult struct {
	Command    string
	Suggestion string
}

type ShellColorScheme struct {
	Prompt           string
	PromptGoal       string
	PromptGoalUnsafe string
	Error            string
	Command          string
	Autosuggest      string
	Answer           string
	GoalMode         string
}

</section id="O">
<section id="P">
type ShellState struct {
	Butterfish *ButterfishCtx
	ParentOut  io.Writer
	ChildIn    io.Writer
	Sigwinch   chan os.Signal

	// set based on model
	PromptMaxTokens      int
	AutosuggestMaxTokens int

	// The current state of the shell
	State                int
	GoalMode             bool
	GoalModeBuffer       string
	GoalModeGoal         string
	GoalModeUnsafe       bool
	ActiveFunction       string
	PromptSuffixCounter  int
	ChildOutReader       chan *byteMsg
	ParentInReader       chan *byteMsg
	CursorPosChan        chan *cursorPosition
	PromptOutputChan     chan *util.CompletionResponse
	PrintErrorChan       chan error
	AutosuggestChan      chan *AutosuggestResult
	History              *ShellHistory
</section id="P">
<section id="Q">
	PromptAnswerWriter   io.Writer
	StyleWriter          *util.StyleCodeblocksWriter
	Prompt               *ShellBuffer
	PromptResponseCancel context.CancelFunc
	Command              *ShellBuffer
	TerminalWidth        int
	Color                *ShellColorScheme
	LastTabPassthrough   time.Time
	parentInBuffer       []byte
	// these are used to estimate number of tokens
	AutosuggestEncoder *tiktoken.Tiktoken
	PromptEncoder      *tiktoken.Tiktoken

	// autosuggest config
	AutosuggestEnabled bool
	LastAutosuggest    string
	AutosuggestCtx     context.Context
	AutosuggestCancel  context.CancelFunc
	AutosuggestBuffer  *ShellBuffer
</section id="Q">
<section id="R">
}

func (this *ShellState) setState(state int) {
	if this.State == state {
		return
	}

	if this.Butterfish.Config.Verbose > 1 {
		log.Printf("State change: %s -> %s", stateNames[this.State], stateNames[state])
	}

	this.State = state
}

func clearByteChan(r <-chan *byteMsg, timeout time.Duration) {
	// then wait for timeout
	target := 2
	seen := 0

	for {
		select {
		case <-time.After(timeout):
			return
		case msg := <-r:
			// if msg.Data includes \n we break
			if bytes.Contains(msg.Data, []byte("\n")) {
				seen++
				if seen >= target {
					return
				}
			}
			continue
		}
	}
}

</section id="R">
<section id="S">
func (this *ShellState) GetCursorPosition() (int, int) {
	// send the cursor position request
	this.ParentOut.Write([]byte(ESC_CUP))
	// we wait 5s, if we haven't gotten a response by then we likely have a bug
	timeout := time.After(5000 * time.Millisecond)
	var pos *cursorPosition

	// the parent in reader watches for these responses, set timeout and
	// panic if we don't get a response
	select {
	case <-timeout:
		panic(`Timeout waiting for cursor position response, this means that either:
- Butterfish has frozen due to a bug.
- You're using a terminal emulator that doesn't work well with butterfish.
Please submit an issue to https://github.com/bakks/butterfish.`)

	case pos = <-this.CursorPosChan:
	}

</section id="S">
<section id="T">
	// it's possible that we have a stale response, so we loop on the channel
	// until we get the most recent one
	for {
		select {
		case pos = <-this.CursorPosChan:
			continue
		default:
			return pos.Row, pos.Column
		}
	}
}

// This sets the PS1 shell variable, which is the prompt that the shell
// displays before each command.
// We need to be able to parse the child shell's prompt to determine where
// it starts, ends, exit code, and allow customization to show the user that
// we're inside butterfish shell. The PS1 is roughly the following:
// PS1 := promptPrefix $PS1 ShellCommandPrompt $? promptSuffix
</section id="T">
<section id="U">
func (this *ButterfishCtx) SetPS1(childIn io.Writer) {
	shell := this.Config.ParseShell()
	var ps1 string

	switch shell {
	case "bash", "sh":
		// the \[ and \] are bash-specific and tell bash to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "PS1=$'\\[%s\\]'$PS1$'%s\\[ $?%s\\] '\n"
	case "zsh":
		// the %%{ and %%} are zsh-specific and tell zsh to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "PS1=$'%%{%s%%}'$PS1$'%s%%{ %%?%s%%} '\n"
	case "fish":
		// the \e[ and \e] are fish-specific and tell fish to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "set -U fish_prompt \\e[%s\\e]$fish_prompt$'%s\\e[ $?%s\\e] '\n"
</section id="U">
<section id="V">
	default:
		log.Printf("Shell not supported: %s. Butterfish relies on being able to parse the PS1 variable and uses it heavily internally for features like autosuggestions and catching the return status. If your shell isn't supported consider filing an issue at https://github.com/bakks/butterfish.", shell)
		return
</section id="V">
<section id="W">
	}

	promptIcon := ""
	if !this.Config.ShellLeavePromptAlone {
		promptIcon = EMOJI_DEFAULT
	}

	fmt.Fprintf(childIn,
		ps1,
		PROMPT_PREFIX_ESCAPED,
		promptIcon,
		PROMPT_SUFFIX_ESCAPED)
}

// Given a string of terminal output, identify terminal prompts based on the
// custom PS1 escape sequences we set.
// Returns:
//   - The last exit code/status seen in the string (i.e. will be non-zero if
//     previous command failed.
//   - The number of prompts identified in the string.
//   - The string with the special prompt escape sequences removed.
</section id="W">
<section id="X">
func ParsePS1(data string, regex *regexp.Regexp, currIcon string) (int, int, string) {
	matches := regex.FindAllStringSubmatch(data, -1)

	if len(matches) == 0 {
		return 0, 0, data
	}

	lastStatus := 0
	prompts := 0

	for _, match := range matches {
		var err error
		lastStatus, err = strconv.Atoi(match[1])
		if err != nil {
			log.Printf("Error parsing PS1 match: %s", err)
		}
		prompts++
	}

	// Remove matches of suffix
	cleaned := regex.ReplaceAllString(data, currIcon)
	// Remove the prefix
	cleaned = strings.ReplaceAll(cleaned, PROMPT_PREFIX, "")

	return lastStatus, prompts, cleaned
}

</section id="X">
<section id="Y">
func (this *ShellState) ParsePS1(data string) (int, int, string) {
	var regex *regexp.Regexp
	if this.Butterfish.Config.ShellLeavePromptAlone {
		regex = ps1Regex
	} else {
		regex = ps1FullRegex
	}

	currIcon := ""
	if !this.Butterfish.Config.ShellLeavePromptAlone {
		if this.GoalMode {
			if this.GoalModeUnsafe {
				currIcon = EMOJI_GOAL_UNSAFE
			} else {
				currIcon = EMOJI_GOAL
			}
		} else {
			currIcon = EMOJI_DEFAULT
		}
	}

	return ParsePS1(data, regex, currIcon)
}

// zsh appears to use this sequence to clear formatting and the rest of the line
// before printing a prompt
</section id="Y">
<section id="Z">
var ZSH_CLEAR_REGEX = regexp.MustCompile("^\x1b\\[1m\x1b\\[3m%\x1b\\[23m\x1b\\[1m\x1b\\[0m\x20+\x0d\x20\x0d")

func (this *ShellState) FilterChildOut(data string) bool {
	if len(data) > 0 && strings.HasPrefix(data, "\x1b[1m") && ZSH_CLEAR_REGEX.MatchString(data) {
		return true
	}

	return false
}

func (this *ButterfishCtx) ShellMultiplexer(
	childIn io.Writer, childOut io.Reader,
</section id="Z">
<section id="AA">
	parentIn io.Reader, parentOut io.Writer) {

	this.SetPS1(childIn)

	colorScheme := DarkShellColorScheme
	if !this.Config.ShellColorDark {
		colorScheme = LightShellColorScheme
	}

	log.Printf("Starting shell multiplexer")

	childOutReader := make(chan *byteMsg, 8)
	parentInReader := make(chan *byteMsg, 8)
	// This is a buffered channel so that we don't block reading input when
	// pushing a new position
	parentPositionChan := make(chan *cursorPosition, 128)

	termWidth, _, err := term.GetSize(int(os.Stdout.Fd()))
	if err != nil {
		panic(err)
	}

	carriageReturnWriter := util.NewReplaceWriter(parentOut, "\n", "\r\n")
	styleCodeblocksWriter := util.NewStyleCodeblocksWriter(carriageReturnWriter,
		termWidth, colorScheme.Answer)

</section id="AA">
<section id="AB">
	sigwinch := make(chan os.Signal, 1)
	signal.Notify(sigwinch, syscall.SIGWINCH)

	shellState := &ShellState{
		Butterfish:           this,
		ParentOut:            parentOut,
		ChildIn:              childIn,
		Sigwinch:             sigwinch,
		State:                stateNormal,
		ChildOutReader:       childOutReader,
		ParentInReader:       parentInReader,
		CursorPosChan:        parentPositionChan,
		PrintErrorChan:       make(chan error, 8),
		History:              NewShellHistory(),
		PromptOutputChan:     make(chan *util.CompletionResponse),
		PromptAnswerWriter:   styleCodeblocksWriter,
		StyleWriter:          styleCodeblocksWriter,
		Command:              NewShellBuffer(),
		Prompt:               NewShellBuffer(),
		TerminalWidth:        termWidth,
</section id="AB">
<section id="AC">
		AutosuggestEnabled:   this.Config.ShellAutosuggestEnabled,
		AutosuggestChan:      make(chan *AutosuggestResult),
		Color:                colorScheme,
		parentInBuffer:       []byte{},
		PromptMaxTokens:      NumTokensForModel(this.Config.ShellPromptModel),
		AutosuggestMaxTokens: NumTokensForModel(this.Config.ShellAutosuggestModel),
</section id="AC">
<section id="AD">
	}

	shellState.Prompt.SetTerminalWidth(termWidth)
	shellState.Prompt.SetColor(colorScheme.Prompt)

	go readerToChannel(childOut, childOutReader)
	go readerToChannelWithPosition(parentIn, parentInReader, parentPositionChan)

	// clear out any existing output to hide the PS1 export stuff
	clearByteChan(childOutReader, 1000*time.Millisecond)

	// start
	shellState.Mux()
</section id="AD">
<section id="AE">
}

func (this *ShellState) Errorf(format string, args ...any) {
	this.PrintErrorChan <- fmt.Errorf(format, args...)
}

func (this *ShellState) PrintError(err error) {
	this.PrintErrorChan <- err
}

// We're asking GPT to generate bash commands, which can use some escapes
// like \' which aren't valid JSON but are valid bash. This function identifies
// those and adds an extra escape so that the JSON is valid.
func AddDoubleEscapesForJSON(s string) string {
	s = strings.ReplaceAll(s, "\\", "\\\\")
	return s
}

type CommandParams struct {
	Cmd string `json:"cmd"`
}

var commandRegex = regexp.MustCompile("^\\s*\\{\\s*\"cmd\"\\s*:\\s*\"(.*)\"\\s*\\}\\s*$")

</section id="AE">
<section id="AF">
// Parse the arguments from the command function returned in a Chat completion.
// We parse this with a regex rather than unmarshalling because the command
// may contain unescaped quotes, which would cause the unmarshal to fail.
func parseCommandParams(params string) (string, error) {
	// get cmd value using commandRegex
	matches := commandRegex.FindStringSubmatch(params)
	if len(matches) != 2 {
		return "", fmt.Errorf("Unable to parse command params: %s", params)
	}
	cmd := matches[1]

	// check for an uneven number of quotes
	if strings.Count(cmd, "\"")%2 == 1 {
		log.Printf("Uneven number of double quotes in command: %s", cmd)
	}
	if strings.Count(cmd, "'")%2 == 1 {
		log.Printf("Uneven number of single quotes in command: %s", cmd)
	}

	return cmd, nil
}

type UserInputParams struct {
	Question string `json:"question"`
}

</section id="AF">
<section id="AG">
func parseUserInputParams(params string) (string, error) {
	// unmarshal UserInputParams from FunctionParameters
	var userInputParams UserInputParams
	err := json.Unmarshal([]byte(params), &userInputParams)
	return userInputParams.Question, err
}

type FinishParams struct {
	Success bool `json:"success"`
}

func parseFinishParams(params string) (bool, error) {
	// unmarshal FinishParams from FunctionParameters
	var finishParams FinishParams
	err := json.Unmarshal([]byte(params), &finishParams)
	return finishParams.Success, err
}

// TODO add a diagram of streams here
</section id="AG">
<section id="AH">
func (this *ShellState) Mux() {
	log.Printf("Started shell mux")
	childOutBuffer := []byte{}

	for {
		select {
		case <-this.Butterfish.Ctx.Done():
			return

		case err := <-this.PrintErrorChan:
			log.Printf("Error: %s", err.Error())
			this.History.Append(historyTypeShellOutput, err.Error())
			fmt.Fprintf(this.ParentOut, "%s%s", this.Color.Error, err.Error())
			this.setState(stateNormal)
			fmt.Fprintf(this.ChildIn, "\n")

		// The CursorPosChan produces cursor positions seen in the parent input,
		// which have then been cleaned from the incoming text. If we find a
		// position in this case it means that a child process has requested
		// the cursor position (rather than butterfish shell), and so we re-add
		// the position to the child input. The other case is when we call
</section id="AH">
<section id="AI">
		// GetCursorPosition(), which blocks this process until we get a valid
		// position.
		case pos := <-this.CursorPosChan:
			fmt.Fprintf(this.ChildIn, "\x1b[%d;%dR", pos.Row, pos.Column)

		// the terminal window resized and we got a SIGWINCH
</section id="AI">
<section id="AJ">
		case <-this.Sigwinch:
			termWidth, _, err := term.GetSize(int(os.Stdout.Fd()))
			if err != nil {
				log.Printf("Error getting terminal size after SIGWINCH: %s", err)
			}
			if this.Butterfish.Config.Verbose > 0 {
				log.Printf("Got SIGWINCH with new width %d", termWidth)
			}
			this.TerminalWidth = termWidth
			this.Prompt.SetTerminalWidth(termWidth)
			this.StyleWriter.SetTerminalWidth(termWidth)
			if this.AutosuggestBuffer != nil {
				this.AutosuggestBuffer.SetTerminalWidth(termWidth)
			}
			if this.Command != nil {
				this.Command.SetTerminalWidth(termWidth)
			}

		// We received an autosuggest result from the autosuggest goroutine
</section id="AJ">
<section id="AK">
		case result := <-this.AutosuggestChan:
			// request cursor position
			_, col := this.GetCursorPosition()
			var buffer *ShellBuffer

			// figure out which buffer we're autocompleting
			switch this.State {
			case statePrompting:
				buffer = this.Prompt
			case stateShell, stateNormal:
				buffer = this.Command
			case statePromptResponse:
				continue
			default:
				log.Printf("Got autosuggest result in unexpected state %d", this.State)
				continue
			}

			this.ShowAutosuggest(buffer, result, col-1, this.TerminalWidth)

		// We got an LLM prompt response, handle the response by adding to history,
		// calling functions returned, etc.
</section id="AK">
<section id="AL">
		case output := <-this.PromptOutputChan:
			historyData := output.Completion
			if historyData != "" {
				this.History.Append(historyTypeLLMOutput, historyData)
			}
			if output.FunctionName != "" {
				this.History.AddFunctionCall(output.FunctionName, output.FunctionParameters)
			}

			// If there is child output waiting to be printed, print that now
			if len(childOutBuffer) > 0 {
				this.ParentOut.Write(childOutBuffer)
				this.History.Append(historyTypeShellOutput, string(childOutBuffer))
				childOutBuffer = []byte{}
			}

			// Get a new prompt
			this.ChildIn.Write([]byte("\n"))

</section id="AL">
<section id="AM">
			if this.GoalMode {
				this.ActiveFunction = output.FunctionName
				this.GoalModeFunction(output)
				if this.GoalMode {
					continue
				}
			}

			this.RequestAutosuggest(0, "")
			this.setState(stateNormal)
			this.ParentInputLoop([]byte{})

		case childOutMsg := <-this.ChildOutReader:
			if childOutMsg == nil {
				log.Println("Child out reader closed")
				this.Butterfish.Cancel()
				return
			}

			if this.Butterfish.Config.Verbose > 2 {
				log.Printf("Child out: %x", string(childOutMsg.Data))
			}

			lastStatus, prompts, childOutStr := this.ParsePS1(string(childOutMsg.Data))
			this.PromptSuffixCounter += prompts

</section id="AM">
<section id="AN">
			if prompts > 0 && this.State == stateNormal && !this.GoalMode {
				// If we get a prompt and we're at the start of a command
				// then we should request autosuggest
				newAutosuggestDelay := this.Butterfish.Config.ShellNewlineAutosuggestTimeout
				if newAutosuggestDelay >= 0 {
					this.RequestAutosuggest(newAutosuggestDelay, "")
				}
			}

			// If we're actively printing a response we buffer child output
			if this.State == statePromptResponse {
				// In goal mode we throw it away
				if !this.GoalMode {
					childOutBuffer = append(childOutBuffer, childOutStr...)
				}
				continue
			}

			endOfFunctionCall := false
</section id="AN">
<section id="AO">
			if this.GoalMode {
				this.GoalModeBuffer += childOutStr
				if this.PromptSuffixCounter >= 2 {
					// this means that since starting to collect command function call
					// output, we've seen two prompts, which means the function call
					// is done and we can send the response back to the model
					endOfFunctionCall = true
				}
			} else if this.ActiveFunction != "" {
				this.ActiveFunction = ""
			}

			// If we're getting child output while typing in a shell command, this
			// could mean the user is paging through old commands, or doing a tab
			// completion, or something unknown, so we don't want to add to history.
</section id="AO">
<section id="AP">
			if this.State != stateShell && !this.FilterChildOut(string(childOutMsg.Data)) {
				if this.ActiveFunction != "" {
					this.History.AppendFunctionOutput(this.ActiveFunction, childOutStr)
				} else {
					this.History.Append(historyTypeShellOutput, childOutStr)
				}
			}

			// If the user is in shell mode and presses tab, and we're not doing a
			// butterfish autocomplete, then we want to edit the command buffer with
			// whatever the shell outputs immediately after tab. We treat stuff
			// printed in a 50ms window as part of the tab completion.
			var AUTOSUGGEST_TAB_WINDOW = 50 * time.Millisecond
			timestamp := time.Now()

</section id="AP">
<section id="AQ">
			if this.State == stateShell {
				timeSinceTab := timestamp.Sub(this.LastTabPassthrough)
				if timeSinceTab < AUTOSUGGEST_TAB_WINDOW {
					if this.Butterfish.Config.Verbose > 1 {
						log.Printf("Time since tab: %s, adding to command: %s",
							timeSinceTab, childOutStr)
					}
					this.Command.Write(childOutStr)
					this.RefreshAutosuggest([]byte(childOutStr), this.Command, this.Color.Command)
				}
			}

			this.ParentOut.Write([]byte(childOutStr))

</section id="AQ">
<section id="AR">
			if endOfFunctionCall {
				// move cursor to the beginning of the line and clear the line
				fmt.Fprintf(this.ParentOut, "\r%s", ESC_CLEAR)
				var status string
				if this.ActiveFunction == "command" {
					status = fmt.Sprintf("Exit Code: %d\n", lastStatus)
				}
				this.GoalModeFunctionResponse(status)
				this.ActiveFunction = ""
				this.GoalModeBuffer = ""
				this.PromptSuffixCounter = 0
			}

</section id="AR">
<section id="AS">
		case parentInMsg := <-this.ParentInReader:
			if parentInMsg == nil {
				log.Println("Parent in reader closed")
				this.Butterfish.Cancel()
				return
			}

			this.ParentInputLoop(parentInMsg.Data)
		}
	}
}

</section id="AS">
<section id="AT">
func (this *ShellState) ParentInputLoop(data []byte) {
	if this.Butterfish.Config.Verbose > 2 {
		log.Printf("Parent in: %x", data)
	}

	// include any cached data
	if len(this.parentInBuffer) > 0 {
		data = append(this.parentInBuffer, data...)
		this.parentInBuffer = []byte{}
	}

	if len(data) == 0 {
		return
	}

	// If we've started an ANSI escape sequence, it might not be complete
	// yet, so we need to cache it and wait for the next message
	if incompleteAnsiSequence(data) {
		this.parentInBuffer = append(this.parentInBuffer, data...)
		return
	}

</section id="AT">
<section id="AU">
	for {
		// The InputFromParent function consumes bytes from the passed in data
		// buffer and returns unprocessed bytes, so we loop and continue to
		// pass data in, if available
		leftover := this.ParentInput(this.Butterfish.Ctx, data)

		if leftover == nil || len(leftover) == 0 {
			break
		}
		if len(leftover) == len(data) {
			// nothing was consumed, we buffer and try again later
			this.parentInBuffer = append(this.parentInBuffer, leftover...)
			break
		}

		// go again with the leftover data
		data = leftover
	}
</section id="AU">
<section id="AV">
}

func (this *ShellState) ParentInput(ctx context.Context, data []byte) []byte {
	hasCarriageReturn := bytes.Contains(data, []byte{'\r'})

	switch this.State {
	case statePromptResponse:
		// Ctrl-C while receiving prompt
		// We're buffering the input right now so we check both the first and last
		// bytes for Ctrl-C
		if data[0] == 0x03 || data[len(data)-1] == 0x03 {
			log.Printf("Canceling prompt response")
			this.PromptResponseCancel()
			this.PromptResponseCancel = nil
			this.GoalMode = false
			this.setState(stateNormal)
			if data[0] == 0x03 {
				return data[1:]
			} else {
				return data[:len(data)-1]
			}
		}

		// If we're in the middle of a prompt response we ignore all other input
		return data

</section id="AV">
<section id="AW">
	case stateNormal:
		if HasRunningChildren() {
			// If we have running children then the shell is running something,
			// so just forward the input.
			this.ChildIn.Write(data)
			return nil
		}

		if data[0] == 0x03 {
			if this.GoalMode {
				// Ctrl-C while in goal mode
				fmt.Fprintf(this.PromptAnswerWriter, "\n%sExited goal mode.%s\n", this.Color.Answer, this.Color.Command)
				this.GoalMode = false
			}

			if this.Command != nil {
				this.Command.Clear()
			}
			if this.Prompt != nil {
				this.Prompt.Clear()
			}
			this.setState(stateNormal)
			this.ChildIn.Write([]byte{data[0]})

			return data[1:]
		}

		// Check if the first character is uppercase or a bang
</section id="AW">
<section id="AX">
		if unicode.IsUpper(rune(data[0])) || data[0] == '!' {
			this.setState(statePrompting)
			this.ClearAutosuggest(this.Color.Command)
			this.Prompt.Clear()
			this.Prompt.Write(string(data))

			// Write the actual prompt start
			color := this.Color.Prompt
			if data[0] == '!' {
				color = this.Color.PromptGoal
			}
			this.Prompt.SetColor(color)
			fmt.Fprintf(this.ParentOut, "%s%s", color, data)

			// We're starting a prompt managed here in the wrapper, so we want to
			// get the cursor position
			_, col := this.GetCursorPosition()
			this.Prompt.SetPromptLength(col - 1 - this.Prompt.Size())
			return data[1:]

</section id="AX">
<section id="AY">
		} else if data[0] == '\t' { // user is asking to fill in an autosuggest
			if this.LastAutosuggest != "" {
				this.RealizeAutosuggest(this.Command, true, this.Color.Command)
				this.setState(stateShell)
				return data[1:]
			} else {
				// no last autosuggest found, just forward the tab
				this.LastTabPassthrough = time.Now()
				this.ChildIn.Write([]byte{data[0]})
			}
			return data[1:]

</section id="AY">
<section id="AZ">
		} else if data[0] == '\r' {
			this.ClearAutosuggest(this.Color.Command)
			this.ChildIn.Write(data)
			return data[1:]

		} else {
			this.Command = NewShellBuffer()
			this.Command.Write(string(data))

			if this.Command.Size() > 0 {
				// this means that the command is not empty, i.e. the input wasn't
				// some control character
				this.RefreshAutosuggest(data, this.Command, this.Color.Command)
				this.setState(stateShell)
			} else {
				this.ClearAutosuggest(this.Color.Command)
			}

			this.ParentOut.Write([]byte(this.Color.Command))
			this.ChildIn.Write(data)
</section id="AZ">
</sections>. You can continue to make changes to the code sections and call the `search_and_replace` function again.

ERROR
No changes were made due to the following error:

Could not find the old_code:
```
		default:
		log.Printf
```
In section 20, which has code:
```
func (this *ButterfishCtx) SetPS1(childIn io.Writer) {
	shell := this.Config.ParseShell()
	var ps1 string

	switch shell {
	case "bash", "sh":
		// the \[ and \] are bash-specific and tell bash to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "PS1=$'\\[%s\\]'$PS1$'%s\\[ $?%s\\] '\n"
	case "zsh":
		// the %%{ and %%} are zsh-specific and tell zsh to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "PS1=$'%%{%s%%}'$PS1$'%s%%{ %%?%s%%} '\n"
	case "fish":
		// the \e[ and \e] are fish-specific and tell fish to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "set -U fish_prompt \\e[%s\\e]$fish_prompt$'%s\\e[ $?%s\\e] '\n"
```

Double-check your indentation and spelling, and make sure there's no missing whitespace or comments.

ERROR
No changes were made due to the following error:

When the following changes are applied:
```diff
--- 
+++ 
@@ -473,6 +473,14 @@
 	case "zsh":
 		// the %%{ and %%} are zsh-specific and tell zsh to not count the enclosed
 		// characters when calculating the cursor position
+		ps1 = "PS1=$'%%{%s%%}'$PS1$'%s%%{ %%?%s%%} '
+	case "fish":
+		// the \e[ and \e] are fish-specific and tell fish to not count the enclosed
+		// characters when calculating the cursor position
+		ps1 = "set -U fish_prompt \e[%s\e]$fish_prompt$'%s\e[ $?%s\e] '
+"
+		// the %%{ and %%} are zsh-specific and tell zsh to not count the enclosed
+		// characters when calculating the cursor position
 		ps1 = "PS1=$'%%{%s%%}'$PS1$'%s%%{ %%?%s%%} '\n"
 	case "fish":
 		// the \e[ and \e] are fish-specific and tell fish to not count the enclosed

```
It yields invalid code with the following message:
```Invalid syntax found within or before the lines 473-483, displayed below:
		// the %%{ and %%} are zsh-specific and tell zsh to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "PS1=$'%%{%s%%}'$PS1$'%s%%{ %%?%s%%} '
	case "fish":
		// the \e[ and \e] are fish-specific and tell fish to not count the enclosed
		// characters when calculating the cursor position
		ps1 = "set -U fish_prompt \e[%s\e]$fish_prompt$'%s\e[ $?%s\e] '
"
		// the %%{ and %%} are zsh-specific and tell zsh to not count the enclosed
		// characters when calculating the cursor position```
. Please retry with different valid changes.

ERROR
No changes were made due to the following error:

No changes were made, make sure old_code and new_code are not the same.