rebind capture to the space bar

space is easier to hit than c mid-pose for a photobooth; the hint bar
now renders "space" instead of a literal blank so the UI stays legible.

exec-cycle.sh

@@ -10,7 +10,7 @@ BRIGHTNESS="${DEFAULT_BRIGHTNESS:-auto}"
 EXPOSURE="${DEFAULT_EXPOSURE:-auto}"
 STEP="${STEP:-5}"
 
-: "${KEY_CAPTURE:=c}"
+: "${KEY_CAPTURE:= }"
 : "${KEY_BRIGHTNESS_UP:=+}"
 : "${KEY_BRIGHTNESS_DOWN:=-}"
 : "${KEY_EXPOSURE_UP:=.}"
@@ -32,8 +32,11 @@ while true; do
     export BRIGHTNESS EXPOSURE
     ./webcam2ascii.sh
     echo
+    capture_label="$KEY_CAPTURE"
+    [ "$KEY_CAPTURE" = " " ] && capture_label="space"
+
     echo "brightness: ${BRIGHTNESS}   exposure: ${EXPOSURE}"
-    echo "[${KEY_BRIGHTNESS_UP}/${KEY_BRIGHTNESS_DOWN}] brightness   [${KEY_EXPOSURE_UP}/${KEY_EXPOSURE_DOWN}] exposure   [${KEY_RESET}] reset to auto   [${KEY_CAPTURE}] capture   [Ctrl+C] quit"
+    echo "[${KEY_BRIGHTNESS_UP}/${KEY_BRIGHTNESS_DOWN}] brightness   [${KEY_EXPOSURE_UP}/${KEY_EXPOSURE_DOWN}] exposure   [${KEY_RESET}] reset to auto   [${capture_label}] capture   [Ctrl+C] quit"
 
     if read -n 1 -t 0.05 -s key; then
         case "$key" in

keybinds.conf

@@ -3,7 +3,7 @@
 # matching is case-insensitive. Ctrl+C always quits and isn't
 # configurable here.
 
-KEY_CAPTURE=c
+KEY_CAPTURE=" "
 KEY_BRIGHTNESS_UP=+
 KEY_BRIGHTNESS_DOWN=-
 KEY_EXPOSURE_UP=.