Make it work on Mac OS

astley.sh

@@ -1,7 +1,6 @@
 #!/bin/bash
-# Rick Astley in your Terminal. Prefers 256-color.
-# 2013.03.04
-# ~ keroserene <3
+# Rick Astley in your Terminal.
+# By Serene Han and Justine Tunney <3
 version='1.0'
 my_head=${BASH_SOURCE[0]}
 base_dir=$(dirname $my_head)
@@ -16,14 +15,12 @@ NEVER_GONNA_TELL_A_LIE="INT TERM EXIT STOP SUSPEND"  # For evil mode.
 AND_HURT_YOU="$HOME/.bashrc"
 
 # Terminal helpers (Assumes 256 colors).
-red='\e[38;5;9m'
-purp='\e[38;5;171m'
-yell='\e[38;5;216m'
-green='\e[38;5;10m'
-gr=$(which grep)
-NEVER_GONNA_GIVE="cat"  # Mreow!
+red='\x1b[38;5;9m'
+purp='\x1b[38;5;171m'
+yell='\x1b[38;5;216m'
+green='\x1b[38;5;10m'
 
-echo -e '\e[s'  # Save cursor
+echo -e '\x1b[s'  # Save cursor
 
 usage () {
   echo -e "${green}Rick Astley performs ♪ Never Gonna Give You Up ♪ on STDOUT."
@@ -51,9 +48,9 @@ clean() {
 }
 
 quit() {
-  echo -en "\e[?25h \e[0m"   # Reset cursor
-  [[ -n $save_term ]] || echo -e "\e[2J \e[H <3"
-  [[ -n $return_mode ]] && return 0 || exit 0 
+  echo -en "\x1b[?25h \x1b[0m"   # Reset cursor
+  [[ -n $save_term ]] || echo -e "\x1b[2J \x1b[H <3"
+  [[ -n $return_mode ]] && return 0 || exit 0
 }
 
 nanosec() {
@@ -125,26 +122,32 @@ never_gonna=(
 "Never gonna say goodbye"
 "Never gonna tell a lie and hurt you")
 give=0
+audpid=0
 # Emit a rick roll lyric.
 oooh() {
   [[ "$give" -gt "${#never_gonna[@]}" ]] && give=0
-  echo -e "\e[2J\e[35;3H\e[0m${never_gonna[$give]}\e[H"
+  echo -e "\x1b[2J\x1b[35;3H\x1b[0m${never_gonna[$give]}\x1b[H"
   (( give++ ))
-  kill -CONT $audpid
+  (( audpid > 1 )) && kill -CONT $audpid
   # pids=$(jobs -p)
   pids=$(jobs -l)
   kill -CONT $pids
   echo "$pids lulz $vidpid" >> ~/roflzz
 }
+cleanup() {
+  (( audpid > 1 )) && kill $audpid
+}
 if [[ $evil ]]; then
   # ... you know the rules, and so do I
   trap - $NEVER_GONNA_TELL_A_LIE
   trap "oooh" 1 2 5 9 15 17 19 20 23 24
+else
+  trap "cleanup" INT
 fi
 trap "quit" EXIT
 
 # we know the game and we're gonna play it!
-echo -e "\e[2J"
+echo -e "\x1b[2J"
 
 # Agnostic to curl or wget availability.
 obtainium() {
@@ -158,27 +161,44 @@ obtainium() {
 # Bean streamin'
 bean="http://bean.vixentele.com/~keroserene"
 remote="$bean/astley80.full.bz2"
-audio="$bean/roll.s16"
-
-# Prepare FPS sync state.
-fps=25; ns_per_frame=$((1000000000/fps)); line=0
-frame=0; next_frame=0
-begin=$(nanosec)
-
-# obtainium $audio | aplay -q -f S16_LE -r 22050 &
-obtainium $audio | aplay -q -f S16_LE -r 8000 &
-while read p; do
-  ((line++))
-  if [[ $line == 32 ]]; then  # Adjust for FPS timing per frame.
-    line=0
-    ((frame++))
-    now=$(nanosec)
-    elapsed=$((now - begin))
-    next_frame=$((elapsed / ns_per_frame))
-    repose=$((frame * ns_per_frame - elapsed))
-    ((repose > 0)) && sleep $(printf 0.%09d $repose)
-  fi
-  # Only print if no frame skips are necessary.
-  (( frame >= next_frame )) && echo -e "$p"
-done < <(obtainium $remote | bunzip2 -q 2> /dev/null)
-echo -e '\e[u'  # Restore cursor position.
+
+if hash afplay 2>/dev/null; then
+  # On Mac OS we pre-fetch compressed audio and use afplay.
+  #remote="$bean/astley80.mac.bz2"
+  echo "downloading audio..."
+  obtainium $bean/roll.gsm.wav >/tmp/roll.gsm.wav
+  afplay /tmp/roll.gsm.wav &
+  audpid=$!
+elif hash afplay 2>/dev/null; then
+  # On Linux if the aplay command is available, we stream raw sound.
+  obtainium $bean/roll.s16 | aplay -q -f S16_LE -r 8000 &
+  audpid=$!
+fi
+
+# Print out frames, inserting pauses and skipping frames if necessary to stay
+# as close as possible to real time.
+python <(cat <<EOF
+import sys
+import time
+fps = 25
+time_per_frame = 1.0 / fps
+begin = time.time()
+frame = 0
+try:
+  for i, line in enumerate(sys.stdin):
+    if i % 32 == 0:
+      frame += 1
+      now = time.time()
+      elapsed = now - begin
+      next_frame = elapsed / time_per_frame
+      repose = frame * time_per_frame - elapsed
+      if repose > 0.0:
+        time.sleep(repose)
+    if frame >= next_frame:
+      sys.stdout.write(line)
+except KeyboardInterrupt:
+  pass
+EOF
+) < <(obtainium $remote | bunzip2 -q 2> /dev/null)
+
+echo -e '\x1b[u'  # Restore cursor position.