working without api key

thumbnail/thumbnail.go

@@ -0,0 +1,107 @@
+package thumbnail
+
+import (
+	"bytes"
+	"encoding/base64"
+	"fmt"
+	"image"
+	"image/color"
+	_ "image/jpeg"
+	_ "image/png"
+	"io"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/disintegration/imaging"
+	"github.com/mattn/go-sixel"
+)
+
+func FetchAndProcessThumbnail(url string) (string, error) {
+	if url == "" {
+		return "", fmt.Errorf("empty URL")
+	}
+
+	client := &http.Client{
+		Timeout: 10 * time.Second,
+	}
+
+	resp, err := client.Get(url)
+	if err != nil {
+		return "", fmt.Errorf("failed to fetch image: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("failed to fetch image: status %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read image data: %w", err)
+	}
+
+	img, _, err := image.Decode(bytes.NewReader(body))
+	if err != nil {
+		return "", fmt.Errorf("failed to decode image: %w", err)
+	}
+
+	// Consistent thumbnail size
+	width := 40
+	height := 15
+
+	img = imaging.Resize(img, width*2, height*2, imaging.Lanczos)
+
+	// Try iTerm2 protocol first
+	if isITerm() {
+		return getITermImageSequence(img), nil
+	}
+
+	// Try Sixel next
+	var buf bytes.Buffer
+	enc := sixel.NewEncoder(&buf)
+	err = enc.Encode(img)
+	if err == nil {
+		return buf.String(), nil
+	}
+
+	// Fall back to ASCII art
+	return imageToASCII(img), nil
+}
+
+func imageToASCII(img image.Image) string {
+	bounds := img.Bounds()
+	width := 40
+	height := 15
+	chars := []string{"█", "▓", "▒", "░", " "}
+
+	var ascii strings.Builder
+	stepX := float64(bounds.Dx()) / float64(width)
+	stepY := float64(bounds.Dy()) / float64(height)
+
+	for y := 0; y < height; y++ {
+		for x := 0; x < width; x++ {
+			px := int(float64(x) * stepX)
+			py := int(float64(y) * stepY)
+			c := color.GrayModel.Convert(img.At(px+bounds.Min.X, py+bounds.Min.Y)).(color.Gray)
+			index := int(c.Y) * (len(chars) - 1) / 255
+			ascii.WriteString(chars[index])
+		}
+		ascii.WriteString("\n")
+	}
+
+	return ascii.String()
+}
+
+func getITermImageSequence(img image.Image) string {
+	var buf bytes.Buffer
+	imaging.Encode(&buf, img, imaging.PNG)
+	encoded := base64.StdEncoding.EncodeToString(buf.Bytes())
+	
+	return fmt.Sprintf("\033]1337;File=inline=1;width=40ch;height=15;preserveAspectRatio=1:%s\a", encoded)
+}
+
+func isITerm() bool {
+	return os.Getenv("TERM_PROGRAM") == "iTerm.app"
+}