fix: rewrite filter as bash+awk to avoid Python/xcode-select dependency

filter/kyofilter

@@ -1,65 +1,48 @@
-#!/usr/bin/python3
-"""CUPS filter for TA 3505ci - injects department code into PostScript stream."""
-import sys
+#!/bin/bash
+# CUPS filter for TA 3505ci - injects department code into PostScript stream.
+# Uses bash+awk only, no Python dependency.
 
+if [ $# -lt 5 ]; then
+    echo "Usage: kyofilter job-id user title copies options [file]" >&2
+    exit 1
+fi
 
-def parse_options(options_str):
-    options = {}
-    for token in options_str.split():
-        if '=' in token:
-            k, v = token.split('=', 1)
-            options[k] = v
-        else:
-            options[token] = 'true'
-    return options
+OPTIONS="${5:-}"
+INFILE="${6:-}"
 
+# Extract department code: KmManagment=MGxxxxx -> xxxxx
+CODE=""
+for OPT in $OPTIONS; do
+    if [[ "$OPT" =~ ^KmManagment=MG([0-9]+)$ ]]; then
+        CODE="${BASH_REMATCH[1]}"
+        break
+    fi
+done
 
-def get_account_code(options):
-    km = options.get('KmManagment', 'Default')
-    if km == 'Default' or not km.startswith('MG'):
-        return None
-    code = km[2:]
-    if not code.isdigit():
-        return None
-    return code  # raw digits, no zero-padding — matches kyofilter_E behaviour
+# Pure passthrough when no code selected
+if [ -z "$CODE" ]; then
+    if [ -n "$INFILE" ]; then
+        cat "$INFILE"
+    else
+        cat
+    fi
+    exit 0
+fi
 
+# Inject PostScript command before %%EndSetup (fallback: before %%Page:)
+INJECT="($CODE) statusdict /setmanagementnumber get exec"
+INPUT="${INFILE:--}"
 
-def process_stream(lines, account_code):
-    if not account_code:
-        yield from lines
-        return
-
-    inject = f"({account_code}) statusdict /setmanagementnumber get exec\n".encode()
-    injected = False
-
-    for line in lines:
-        stripped = line.rstrip(b'\r\n')
-        if not injected and (stripped.rstrip() == b'%%EndSetup' or stripped.startswith(b'%%Page:')):
-            yield inject
-            injected = True
-        yield line
-
-    if not injected:
-        sys.stderr.write("kyofilter: WARNING: no injection point found in PostScript stream\n")
-
-
-
-def main():
-    if len(sys.argv) < 6:
-        sys.stderr.write("Usage: kyofilter job-id user title copies options [file]\n")
-        sys.exit(1)
-
-    options = parse_options(sys.argv[5])
-    account_code = get_account_code(options)
-
-    infile = open(sys.argv[6], 'rb') if len(sys.argv) > 6 else sys.stdin.buffer
-    try:
-        for chunk in process_stream(infile, account_code):
-            sys.stdout.buffer.write(chunk)
-    finally:
-        if len(sys.argv) > 6:
-            infile.close()
-
-
-if __name__ == '__main__':
-    main()
+awk -v inject="$INJECT" '
+BEGIN { injected = 0 }
+!injected && /^%%EndSetup/ {
+    print inject
+    injected = 1
+}
+!injected && /^%%Page:/ {
+    print inject
+    injected = 1
+}
+{ print }
+END { if (!injected) print "kyofilter: WARNING: no injection point found" > "/dev/stderr" }
+' "$INPUT"