feat: add support for images

internal/tui/image/images.go

@@ -0,0 +1,72 @@
+package image
+
+import (
+	"fmt"
+	"image"
+	"os"
+	"strings"
+
+	"github.com/charmbracelet/lipgloss"
+	"github.com/disintegration/imaging"
+	"github.com/lucasb-eyer/go-colorful"
+)
+
+func ValidateFileSize(filePath string, sizeLimit int64) (bool, error) {
+	fileInfo, err := os.Stat(filePath)
+	if err != nil {
+		return false, fmt.Errorf("error getting file info: %w", err)
+	}
+
+	if fileInfo.Size() > sizeLimit {
+		return true, nil
+	}
+
+	return false, nil
+}
+
+func ToString(width int, img image.Image) string {
+	img = imaging.Resize(img, width, 0, imaging.Lanczos)
+	b := img.Bounds()
+	imageWidth := b.Max.X
+	h := b.Max.Y
+	str := strings.Builder{}
+
+	for heightCounter := 0; heightCounter < h; heightCounter += 2 {
+		for x := range imageWidth {
+			c1, _ := colorful.MakeColor(img.At(x, heightCounter))
+			color1 := lipgloss.Color(c1.Hex())
+
+			var color2 lipgloss.Color
+			if heightCounter+1 < h {
+				c2, _ := colorful.MakeColor(img.At(x, heightCounter+1))
+				color2 = lipgloss.Color(c2.Hex())
+			} else {
+				color2 = color1
+			}
+
+			str.WriteString(lipgloss.NewStyle().Foreground(color1).
+				Background(color2).Render("▀"))
+		}
+
+		str.WriteString("\n")
+	}
+
+	return str.String()
+}
+
+func ImagePreview(width int, filename string) (string, error) {
+	imageContent, err := os.Open(filename)
+	if err != nil {
+		return "", err
+	}
+	defer imageContent.Close()
+
+	img, _, err := image.Decode(imageContent)
+	if err != nil {
+		return "", err
+	}
+
+	imageString := ToString(width, img)
+
+	return imageString, nil
+}