fix push pics script

sync-newer-images

@@ -1,35 +1,37 @@
 #!/bin/bash
 #
-# sync-newer-images — For each top-level image in SRC, find any matching
-# filename recursively under DEST and copy over it if SRC is newer.
+# sync-newer-images — For each top-level image in SRC, copy it to DEST
+# if it doesn't already exist anywhere under DEST.
 # Works on Linux and macOS (bash 3.2+ compatible).
 
 usage() {
     cat <<'EOF'
 Usage: sync-newer-images [options] <destination> <source>
 
-For each top-level image in source, find any matching filename recursively
-under destination and copy over it if the source file is newer.
-
-Arguments:
-  destination   Path to copy TO
-  source        Path to copy FROM
+For each top-level image in source, copy it into destination if no
+file with the same name exists anywhere under destination.
 
 Options:
+  -u, --update  If a matching file already exists under destination,
+                copy over it only if the content differs (uses cmp).
   -h, --help    Show this help message and exit
 EOF
     exit 0
 }
 
-for arg in "$@"; do
-    case "$arg" in
+update_mode=0
+
+while [ $# -gt 0 ]; do
+    case "$1" in
         -h|--help) usage ;;
+        -u|--update) update_mode=1; shift ;;
+        *) break ;;
     esac
 done
 
 if [ $# -lt 2 ]; then
     echo "Error: destination and source are required" >&2
-    echo "Usage: sync-newer-images <destination> <source>" >&2
+    echo "Usage: sync-newer-images [options] <destination> <source>" >&2
     exit 1
 fi
 
@@ -46,6 +48,9 @@ if [ ! -d "$SRC" ]; then
     exit 1
 fi
 
+# Build deduplicated, newline-separated list of all basenames under DEST.
+basenames=$(find "$DEST" -type f 2>/dev/null | sed 's|.*/||' | sort -u)
+
 copied=0
 
 for srcfile in "$SRC"/*; do
@@ -58,12 +63,17 @@ for srcfile in "$SRC"/*; do
     esac
 
     filename="${srcfile##*/}"
-    while IFS= read -r destfile; do
-        if [ -f "$destfile" ] && [ "$srcfile" -nt "$destfile" ]; then
+
+    if ! printf '%s\n' "$basenames" | grep -qxF "$filename"; then
+        cp -v "$srcfile" "$DEST/"
+        copied=$((copied + 1))
+    elif [ "$update_mode" -eq 1 ]; then
+        destfile=$(find "$DEST" -type f -name "$filename" 2>/dev/null | head -1)
+        if [ -n "$destfile" ] && ! cmp -s "$srcfile" "$destfile"; then
             cp -v "$srcfile" "$destfile"
             copied=$((copied + 1))
         fi
-    done < <(find "$DEST" -type f -name "$filename" 2>/dev/null)
+    fi
 done
 
-echo "Copied ${copied} newer image(s) from ${SRC} into ${DEST}"
+echo "Copied ${copied} image(s) from ${SRC} into ${DEST}"