Clean LLM output WIP

server/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"context"
 	"fmt"
 	"log"
@@ -15,6 +16,43 @@ import (
 	"github.com/tmc/langchaingo/llms/ollama"
 )
 
+type CodeBlockParser struct {
+	processed  int
+	foundStart bool
+	foundEnd   bool
+}
+
+func NewCodeBlockParser() *CodeBlockParser {
+	return &CodeBlockParser{
+		processed:  0,
+		foundStart: false,
+		foundEnd:   false,
+	}
+}
+
+func (p *CodeBlockParser) ParseStream(chunk []byte) []byte {
+	if !p.foundStart {
+		if bytes.Contains(chunk, []byte("```")) {
+			p.foundStart = true
+			chunk = nil
+		}
+	}
+
+	if p.foundStart && p.processed == 1 {
+		chunk = nil
+	}
+
+	if p.foundStart && !p.foundEnd {
+		if bytes.Contains(chunk, []byte("```")) {
+			p.foundEnd = true
+			chunk = nil
+		}
+	}
+
+	p.processed += 1
+	return chunk
+}
+
 func main() {
 	err := godotenv.Load()
 
@@ -58,17 +96,23 @@ func main() {
 			log.Fatal(err)
 		}
 
-		// TODO: Clean the prompt result of any unnecessary formatting or text
+		parser := NewCodeBlockParser()
 		ollamaCtx := context.Background()
-		content := []llms.MessageContent{
+		prompt := []llms.MessageContent{
 			llms.TextParts(llms.ChatMessageTypeSystem, `You must only generate code without any descriptions. Also don't include any code comments and use spaces instead of tabs for spacing. Most importantly. Most importantly you must remove any markdown code fences that wrap the content!`),
 			llms.TextParts(llms.ChatMessageTypeHuman, fmt.Sprintf(`
 				Generate a maximum of %d lines of code from a well known open source project in the %s programming language.`, lines, lang)),
 		}
 
-		if _, err := llm.GenerateContent(ollamaCtx, content, llms.WithStreamingFunc(func(streamCtx context.Context, chunk []byte) error {
-			ctx.Response().Write(chunk)
-			ctx.Response().Flush()
+		if _, err := llm.GenerateContent(ollamaCtx, prompt, llms.WithStreamingFunc(func(streamCtx context.Context, chunk []byte) error {
+			cleaned := parser.ParseStream(chunk)
+
+			if len(cleaned) > 0 {
+				fmt.Println(chunk, string(chunk))
+				ctx.Response().Write(cleaned)
+				ctx.Response().Flush()
+			}
+
 			return nil
 		})); err != nil {
 			log.Fatal(err)