fix spinny

assets/spinny/spinny.sh

@@ -0,0 +1,88 @@
+#!/usr/bin/env bash 
+
+declare __spinny__spinner_pid
+
+declare -a __spinny__frames=()
+
+spinny::start() {
+  tput civis
+  spinny::_spinner &
+  __spinny__spinner_pid=$!
+}
+
+spinny::stop() {
+  [[ -z "$__spinny__spinner_pid" ]] && return 0
+
+  kill -9 "$__spinny__spinner_pid" 
+  # Use conditional to avoid exiting the program immediatly
+  wait "$__spinny__spinner_pid" 2>/dev/null || true
+}
+
+spinny::_spinner() {
+  local delay=${SPINNY_DELAY:-0.3}
+  spinny::_load_frames
+  spinny::_pad_frames
+  while :
+  do
+    for frame in "${__spinny__frames[@]}"
+    do
+      # After rendering each frame the cursor is reset to 
+      # the previous position so that the next frame can 
+      # overwrite it
+      tput sc
+      printf "%b" "$frame"
+      tput rc
+      sleep "$delay"
+    done
+  done
+}
+
+spinny::_pad_frames() {
+  # Frames with different lengths need to be padded
+  # for a smooth animation. We calculate the maximum
+  # size of all frames and pad all smaller ones with
+  # white space.
+  local max_length
+  max_length=$(spinny::_max_framelength)
+  local array_length=${#__spinny__frames[@]}
+  for (( i=0; c<array_length; c++ )) do
+    local frame=${__spinny__frames[i]}
+    local frame_length=${#frame}
+    diff=$((max_length - frame_length + 1))
+    # This adds the required number of white spaces
+    # to the frame
+    # TODO: Replace with pure bash if possible
+    filler=$(seq -s ' ' "$diff" |tr -d '[:digit:]')
+    __spinny__frames[i]="$frame$filler"
+  done
+}
+
+spinny::_max_framelength() {
+  local max=${#__spinny__frames[0]}
+  for frame in "${__spinny__frames[@]}"
+  do
+    local len=${#frame}
+    ((len > max)) && max=$len
+  done
+  echo "$max"
+}
+
+spinny::_load_frames() {
+  # Load custom frames if any or fall back on the default animation
+  if [[ -z $SPINNY_FRAMES ]]; then 
+    __spinny__frames=(- "\\" "|" /)
+  else
+    __spinny__frames=("${SPINNY_FRAMES[@]}")
+  fi
+}
+
+spinny::_finish(){
+  # Make sure to remove variables and make the cursor visible again
+  unset __spinny__spinner_pid
+  unset __spinny__frames
+  tput cnorm
+}
+
+trap spinny::_finish EXIT
+
+