fix copies

Author: BNH440

modules/printhost/cups.nix

@@ -54,6 +54,10 @@ let
   ocfpsFilter = pkgs.replaceVars ./scripts/ocfps {
     pdftops = "${pkgs.poppler-utils}/bin/pdftops";
     pstops = "${pkgs.cups}/lib/cups/filter/pstops";
+    grep = "${pkgs.gnugrep}/bin/grep";
+    awk = "${pkgs.gawk}/bin/awk";
+    mktemp = "${pkgs.coreutils}/bin/mktemp";
+    rm = "${pkgs.coreutils}/bin/rm";
   };
 
   # Shell wrapper so the filter runs under the Nix-store bash rather than

modules/printhost/scripts/ocfps

@@ -13,14 +13,47 @@ set -euo pipefail
 
 PDFTOPS=@pdftops@
 PSTOPS=@pstops@
+GREP=@grep@
+AWK=@awk@
+MKTEMP=@mktemp@
+RM=@rm@
 
 if [ "$#" -ne 5 ] && [ "$#" -ne 6 ]; then
     echo "Usage: $0 job-id user title copies options [file]"
     exit
 fi
 
+copies="$4"
+
 if [ "$#" -eq 5 ]; then
     $PDFTOPS - - | $PSTOPS "$@"
 else
-    $PDFTOPS "$6" - | $PSTOPS "${@:1:5}"
+    # Generate PS to a temp file so we can inspect it before passing to pstops.
+    #
+    # Firefox and GTK print dialogs do not send a CUPS/IPP copies attribute;
+    # instead they embed /NumCopies in the PDF's viewer preferences dictionary
+    # (possibly inside compressed object streams, so the raw PDF is not
+    # grep-able).  Poppler's pdftops reads that dictionary and emits
+    # "<</NumCopies N>> setpagedevice" in the PS output when N > 1.  We read
+    # that value and pass it as the copies count to pstops so the printer
+    # receives the correct copy count.
+    ps_tmp=$($MKTEMP /tmp/ocfps-XXXXXX.ps)
+    trap '$RM -f "$ps_tmp"' EXIT
+
+    $PDFTOPS "$6" "$ps_tmp"
+
+    echo "[ocfps] ps_tmp size=$($AWK 'END{print NR}' "$ps_tmp") lines, copies_arg=$copies" >&2
+    $GREP -om3 'NumCopies [0-9]*' "$ps_tmp" >&2 || echo "[ocfps] NumCopies not found in PS" >&2
+    $GREP '%%Pages:' "$ps_tmp" >&2 || echo "[ocfps] %%Pages not found" >&2
+    cp "$ps_tmp" /tmp/ocfps-debug.ps 2>/dev/null || true
+
+    if [ "$copies" -eq 1 ]; then
+        ps_copies=$($GREP -om1 'NumCopies [0-9]*' "$ps_tmp" | $AWK '{print $2}') || true
+        if [ -n "$ps_copies" ] && [ "$ps_copies" -gt 1 ] 2>/dev/null; then
+            copies="$ps_copies"
+        fi
+    fi
+
+    echo "[ocfps] final copies=$copies" >&2
+    $PSTOPS "$1" "$2" "$3" "$copies" "$5" "$ps_tmp"
 fi