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+#!/usr/bin/env bash
+#
+# spark
+# https://github.com/holman/spark
+#
+# Generates sparklines for a set of data.
+#
+# Here's a good web-based sparkline generator that was a bit of inspiration
+# for spark:
+#
+#   https://datacollective.org/sparkblocks
+#
+# spark takes a comma-separated or space-separated list of data and then prints
+# a sparkline out of it.
+#
+# Examples:
+#
+#   spark 1 5 22 13 53
+#   # => ▁▁▃▂▇
+#
+#   spark 0 30 55 80 33 150
+#   # => ▁▂▃▅▂▇
+#
+#   spark -h
+#   # => Prints the spark help text.
+
+# Generates sparklines.
+#
+# $1 - The data we'd like to graph.
+_echo()
+{
+  if [ "X$1" = "X-n" ]; then
+    shift
+    printf "%s" "$*"
+  else
+    printf "%s\n" "$*"
+  fi
+}
+
+spark()
+{
+  local n numbers=
+
+  # find min/max values
+  local min=0xffffffff max=0
+
+  for n in ${@//,/ }
+  do
+    # on Linux (or with bash4) we could use `printf %.0f $n` here to
+    # round the number but that doesn't work on OS X (bash3) nor does
+    # `awk '{printf "%.0f",$1}' <<< $n` work, so just cut it off
+    n=${n%.*}
+    (( n < min )) && min=$n
+    (( n > max )) && max=$n
+    numbers=$numbers${numbers:+ }$n
+  done
+
+  # print ticks
+  local ticks=(▁ ▂ ▃ ▄ ▅ ▆ ▇ █)
+
+  # use a high tick if data is constant
+  (( min == max )) && ticks=(▅ ▆)
+
+  local f=$(( (($max-$min)<<8)/(${#ticks[@]}-1) ))
+  (( f < 1 )) && f=1
+
+  for n in $numbers
+  do
+    _echo -n ${ticks[$(( ((($n-$min)<<8)/$f) ))]}
+  done
+  _echo
+}
+
+# If we're being sourced, don't worry about such things
+if [ "$BASH_SOURCE" == "$0" ]; then
+  # Prints the help text for spark.
+  help()
+  {
+    local spark=$(basename $0)
+    cat <<EOF
+
+    USAGE:
+      $spark [-h|--help] VALUE,...
+
+    EXAMPLES:
+      $spark 1 5 22 13 53
+      ▁▁▃▂█
+      $spark 0,30,55,80,33,150
+      ▁▂▃▄▂█
+      echo 9 13 5 17 1 | $spark
+      ▄▆▂█▁
+EOF
+  }
+
+  # show help for no arguments if stdin is a terminal
+  if { [ -z "$1" ] && [ -t 0 ] ; } || [ "$1" == '-h' ] || [ "$1" == '--help' ]
+  then
+    help
+    exit 0
+  fi
+
+  spark ${@:-`cat`}
+fi