#221 rework: derive attachment line count from blob, non-image text attachments show real lines

internal/web/web.go

@@ -10,6 +10,7 @@ import (
 	"encoding/hex"
 	"fmt"
 	"html/template"
+	"io"
 	"io/fs"
 	"log"
 	"net/http"
@@ -232,6 +233,10 @@ func (h *Handlers) renderPageStatus(w http.ResponseWriter, name string, status i
 }
 
 func (h *Handlers) renderPaste(w http.ResponseWriter, row *store.PasteRow, justCreated bool, deletionToken string, readsRemaining *int) {
+	// #221: a non-image attachment is real text; derive its line count from
+	// the blob instead of the (empty) stored content, or details show 1 line.
+	// Image pastes render no code box, so their line count is meaningless
+	// and pinned to 1 below.
 	lines := strings.Count(row.Content, "\n") + 1
 	gutter := ""
 	for i := 1; i <= lines; i++ {
@@ -257,6 +262,20 @@ func (h *Handlers) renderPaste(w http.ResponseWriter, row *store.PasteRow, justC
 	sizeBytes := len(row.Content)
 	if attachment != nil {
 		sizeBytes = int(attachment.Size)
+		// #221: the blob replaced the stored text. For non-image
+		// attachments read the real text back to derive the line count
+		// (details showed "1 line" for any attachment); image pastes
+		// render no code box, so leave the meaningless 1.
+		isImage := strings.HasPrefix(attachment.Mime, "image/")
+		if !isImage {
+			if rc, err := h.Store.Blobs().Get(attachment.PasteID + "/" + attachment.SHA256); err == nil {
+				b, rerr := io.ReadAll(rc)
+				rc.Close()
+				if rerr == nil {
+					lines = strings.Count(string(b), "\n") + 1
+				}
+			}
+		}
 	}
 	summary := fmt.Sprintf("%s · %s · %d views · %s", lang, humanSize(sizeBytes), row.ViewCount, agoString(row.CreatedAt))
 	data := map[string]any{