feat: native clipboard image sync (Linux, opt-in sync_images)

internal/daemon/daemon.go

@@ -4,6 +4,9 @@ package daemon
 
 import (
 	"context"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/hex"
 	"log"
 	"os"
 	"sync"
@@ -153,6 +156,10 @@ func (d *Daemon) Run(ctx context.Context) error {
 	defer ticker.Stop()
 
 	var lastText string
+	var lastImageHash string
+
+	// Optional image sync (Linux only today); requires platform support.
+	imageCB, _ := d.clipboard.(clipboard.ImageClipboard)
 
 	log.Printf("clip-sync: polling clipboard every %v, %d peer(s) configured",
 		d.cfg.PollInterval(), len(d.cfg.Peers))
@@ -168,26 +175,48 @@ func (d *Daemon) Run(ctx context.Context) error {
 			text, err := d.clipboard.Read()
 			if err != nil {
 				log.Printf("clip-sync: clipboard read: %v", err)
-				continue
+			} else if text != "" && text != lastText {
+				lastText = text
+
+				// Record our write so the filter can block echoes.
+				d.filter.MarkWritten(text)
+
+				if d.history != nil {
+					d.history.Append(history.Entry{Text: text, Origin: d.origin, Ts: time.Now().UnixNano()})
+				}
+
+				if len(d.cfg.Peers) > 0 || d.discovery != nil {
+					d.broadcaster.Broadcast(text)
+				}
 			}
 
-			if text == "" || text == lastText {
-				continue
-			}
+			// Image sync (opt-in).
+			if d.cfg.Daemon.SyncImages && imageCB != nil {
+				mime, data, err := imageCB.ReadImage()
+				if err != nil || len(data) == 0 {
+					continue
+				}
+				h := hashBytes(data)
+				if h == lastImageHash {
+					continue
+				}
+				lastImageHash = h
 
-			lastText = text
+				d.filter.MarkWrittenPayload(dedup.Payload{
+					Mime: mime,
+					Data: base64.StdEncoding.EncodeToString(data),
+				})
 
-			// Record our write so the filter can block echoes.
-			d.filter.MarkWritten(text)
-
-			if d.history != nil {
-				d.history.Append(history.Entry{Text: text, Origin: d.origin, Ts: time.Now().UnixNano()})
-			}
-
-			// Broadcast to all peers.
-			if len(d.cfg.Peers) > 0 || d.discovery != nil {
-				d.broadcaster.Broadcast(text)
+				if len(d.cfg.Peers) > 0 || d.discovery != nil {
+					d.broadcaster.BroadcastImage(mime, data)
+				}
 			}
 		}
 	}
 }
+
+// hashBytes returns a short hex digest of b, used to detect clipboard changes.
+func hashBytes(b []byte) string {
+	sum := sha256.Sum256(b)
+	return hex.EncodeToString(sum[:])
+}