fix things

facematcher.py

 import time
 import argparse
 
-def match(paths, cap, show):
+def match(paths, cap, show, delay):
     faces = []
     faceencs = []
     for path in paths:
 
     matching = False
 
+    tacc = 0
+    then = time.time() * 1000
     while not matching:
         ret, frame = cap.read()
         if cv2.mean(frame)[0] < 30:
             continue
 
+        # delay
+        now = time.time() * 1000
+        if tacc < delay:
+            tacc += now - then
+            then = now
+            continue
+        else:
+            tacc = 0
+            then = now
+
         scale = 1
         rgb_frame = cv2.cvtColor(frame, cv2.COLOR_GRAY2RGB)
         small_rgb_frame = cv2.resize(rgb_frame, (0, 0), fx=scale, fy=scale)
     "-s", "--show", default=False, action="store_true",
     help="show what the camera sees")
 sub_match.add_argument(
-    "-w", "--wait", default=False, action="store_true",
+    "-w", "--waitfor", type=str, default=None,
     help="wait for newline on stdin")
+sub_match.add_argument(
+    "-t", "--delay", type=int, default=0,
+    help="wait n milliseconds between each frame")
 sub_match.add_argument(
     "faces", type=str, nargs="+",
     help="the source image file(s)")
 args = parser.parse_args()
 
 if args.command == "match":
-    if args.wait:
-        input("Waiting for newline...")
-    match(args.faces, cv2.VideoCapture(args.device), args.show)
+    print(args)
+    if args.waitfor is not None:
+        s = input("Waiting for '"+args.waitfor+"'...")
+        if s != args.waitfor:
+            print("Exiting because stdin was '"+s+"' and expected '"+args.waitfor+"'.")
+            exit(1)
+        else:
+            print("Got '"+s+"'.")
+
+    match(args.faces, cv2.VideoCapture(args.device), args.show, args.delay)
 elif args.command == "record":
     record(args.face, cv2.VideoCapture(args.device))

facewaiter.sh

 #!/bin/sh
 
+echo "hello am facewaiter $$"
+
 keyboard="AT Translated Set 2 keyboard"
+battery="/sys/class/power_supply/BAT0"
+device=2
+faces="faces"
+
+matchpid=
+cleanup() {
+	if [ -n "$matchpid" ]; then
+		kill "$matchpid"
+	fi
+	exit 1
+}
+trap cleanup SIGTERM
+
+if [ -n "$battery" ]; then
+	st="$(cat "$battery/status")"
+	if [ "$st" != "Discharging" ] && [ "$st" != "Unknown" ]; then
+		./facematcher.py match --delay 500 --device "$device" $faces/$USER/*
+		exit $?
+	fi
+fi
 
 rm -f .testfifo
 mkfifo .testfifo
 
 rm -f .matchfifo
 mkfifo .matchfifo
-cat .matchfifo | ./facematcher.py match --device 2 --wait faces/$USER/* &
+./facematcher.py match --delay 500 --device 2 --waitfor start $faces/$USER/* <.matchfifo &
+matchpid=$!
 
 read <.testfifo
-echo > .matchfifo
+echo start > .matchfifo
 
 kill $xpid
 wait