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301package main
import (
"bytes"
"context"
"crypto/rand"
_ "embed"
"encoding/base64"
"flag"
"fmt"
"iter"
"os"
"slices"
"strings"
"unicode/utf8"
"9fans.net/go/acme"
"github.com/openai/openai-go"
"github.com/openai/openai-go/responses"
"github.com/openai/openai-go/shared"
)
//go:generate cue exp gengotypes
//go:embed schema.cue
var schemaCUE string
func main() {
if err := main1(); err != nil {
fmt.Fprintf(os.Stderr, "AI: %v\n", err)
os.Exit(1)
}
}
type params struct {
Filename string
Instructions string
}
var systemPrompt = `
I'm currently editing a file.
Your task is to produce the new contents of this file following any intent indicated
in the user instructions. Please produce me a JSON result with CUE schema
(indicated by #Reply); see the "schema" part for info on JSON schemas.
I've included other parts indicating aspects of the current edit session.
Each part is in JSON format described by the CUE #Part schema.
`
var (
flagBig = flag.Bool("big", false, "allow large files")
flagModel = flag.String("m", string(openai.ChatModelGPT4o), "OpenAI model to use")
flagVerbose = flag.Bool("v", false, "enable verbose output")
)
func main1() error {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, `
usage: AI [<prompt> [file...]]
This executes OpenAI with the given instructions on the selection
in the current file.
Any files provided will be attached as context.
`)
os.Exit(2)
}
flag.Parse()
win, err := acmeCurrentWin()
if err != nil {
return err
}
defer win.CloseFiles()
key := os.Getenv("OPENAI_API_KEY")
if key == "" {
return fmt.Errorf("no value set for $OPENAI_API_KEY")
}
var parts []Part
parts = append(parts, Part{
Instructions: "This holds the CUE schema for the JSON reply for you to send me",
Content: schemaCUE,
})
part, body, err := currentFilePart(win)
if err != nil {
return err
}
parts = append(parts, part)
args := flag.Args()
if len(args) > 0 {
parts = append(parts, Part{
Instructions: "This part holds the user instructions.",
Content: args[0],
})
args = args[1:]
}
for _, filename := range args {
data, err := os.ReadFile(filename)
if err != nil {
return err
}
if len(data) > 100*1024 && !*flagBig {
return fmt.Errorf("refusing to send large file (%d bytes); use -big to override", len(data))
}
b64 := false
if !utf8.Valid(data) {
b64 = true
data = base64.StdEncoding.AppendEncode(nil, data)
}
parts = append(parts, Part{
Instructions: "this is a file attached by the user",
Filename: filename,
Base64: b64,
Content: string(data),
})
}
// Build the messages
systemMsg := responses.EasyInputMessageParam{
Role: responses.EasyInputMessageRoleSystem,
Content: responses.EasyInputMessageContentUnionParam{
OfString: openai.Opt(systemPrompt),
},
}
var userContent bytes.Buffer
for _, p := range parts {
aiPart, err := p.AsOpenAI()
if err != nil {
return fmt.Errorf("cannot marshal part: %v", err)
}
userContent.WriteString(aiPart.Text)
userContent.WriteString("\n")
}
userMsg := responses.EasyInputMessageParam{
Role: responses.EasyInputMessageRoleUser,
Content: responses.EasyInputMessageContentUnionParam{
OfString: openai.Opt(userContent.String()),
},
}
// Create the client, relying on OPENAI_API_KEY in env
client := openai.NewClient()
ctx := context.Background()
respIter := streamIter(client.Responses.NewStreaming(ctx, responses.ResponseNewParams{
Model: responses.ChatModel(*flagModel),
Input: responses.ResponseNewParamsInputUnion{
OfInputItemList: responses.ResponseInputParam{
{OfMessage: &systemMsg},
{OfMessage: &userMsg},
},
},
Text: responses.ResponseTextConfigParam{
Format: responses.ResponseFormatTextConfigUnionParam{
OfJSONObject: &shared.ResponseFormatJSONObjectParam{},
},
},
}))
var buf bytes.Buffer
for part, err := range partsIter(respIter, &buf) {
if err != nil {
fmt.Printf("bad response:\n%s\n", buf.Bytes())
return fmt.Errorf("error receiving reply: %v", err)
}
var newBody []byte
switch r := part.AsAny().(type) {
case *FurtherInstructionNeeded:
fmt.Printf("further instruction needed: %s\n", r.Message)
continue
case *FullContent:
newBody = body.text
case *SelectionAppend:
body.selection = slices.Concat(body.selection, []byte(r.Text))
newBody = slices.Concat(body.head, body.selection, []byte(r.Text), body.tail)
case *SelectionInsert:
body.selection = slices.Concat([]byte(r.Text), body.selection)
newBody = slices.Concat(body.head, body.selection, body.tail)
case *SelectionReplace:
body.selection = []byte(r.Text)
newBody = slices.Concat(body.head, body.selection, body.tail)
case *Commentary:
fmt.Println(r.Text)
continue
default:
return fmt.Errorf("unhandled reply type %T", r)
}
body.text = ensureNewline(body.text)
newBody = ensureNewline(newBody)
if err := doApply(win, body.text, newBody); err != nil {
// TODO: ouch: this is racy.
fmt.Printf("response:\n%s\n", buf.Bytes())
return fmt.Errorf("cannot apply results to acme window: %v", err)
}
body.text = newBody
}
return nil
}
func ensureNewline(data []byte) []byte {
if !bytes.HasSuffix(data, []byte("\n")) {
data = append(data, '\n')
}
return data
}
type bodyInfo struct {
text []byte
head []byte
selection []byte
tail []byte
}
func currentFilePart(win *acme.Win) (part Part, info *bodyInfo, err error) {
var buf bytes.Buffer
if err := copyBody(&buf, win); err != nil {
return Part{}, nil, fmt.Errorf("cannot copy window body: %v", err)
}
body := buf.Bytes()
_, _, err = win.ReadAddr() // ensure address file is open
if err != nil {
return Part{}, nil, fmt.Errorf("cannot read address: %v", err)
}
if err := win.Ctl("addr=dot"); err != nil {
return Part{}, nil, fmt.Errorf("cannot set address: %v", err)
}
a0, a1, err := win.ReadAddr()
if err != nil {
return Part{}, nil, fmt.Errorf("cannot get dot: %v", err)
}
a0b, a1b := runeOffset2ByteOffset(body, a0), runeOffset2ByteOffset(body, a1)
head := body[:a0b]
selection := body[a0b:a1b]
tail := body[a1b:]
delim := []byte(uniqID())
hbody := slices.Concat(
head,
delim,
selection,
delim,
tail,
)
tagBytes, err := win.ReadAll("tag")
if err != nil {
return Part{}, nil, fmt.Errorf("cannot read tag: %v", err)
}
filename, _, _ := strings.Cut(string(tagBytes), " ")
part = Part{
Instructions: fmt.Sprintf("Contents of the file currently being edited. The current selection is surrounded by the delimiter string %q", delim),
Filename: filename,
Content: string(hbody),
}
info = &bodyInfo{
text: body,
head: head,
selection: selection,
tail: tail,
}
return part, info, nil
}
func uniqID() string {
buf := make([]byte, 16)
if _, err := rand.Read(buf); err != nil {
panic(err)
}
return fmt.Sprintf("%x", buf)
}
type stream[T any] interface {
Next() bool
Current() T
Err() error
}
func streamIter[T any](s stream[T]) iter.Seq2[T, error] {
return func(yield func(T, error) bool) {
for s.Next() {
if !yield(s.Current(), s.Err()) {
if s, _ := s.(interface{ Close() }); s != nil {
s.Close()
}
return
}
}
}
}