Useful bash helper for invoking dot

dot-functions.sh

#!/bin/bash
echo $0 | grep -q "dot-functions.sh" && {
  echo "usage: source dot-functions.sh, then run 'dot foo.dot' and the PNG will show"
  exit 1
}

produce_image_type() {
  for arg in "$@"; do
    [[ "$arg" =~ -T[-_a-z]+ ]] && echo ${arg#-T} && return 0
  done
  echo "png"
}

dot() {
  local DOT_CMD=`which dot`
  local IMAGE_TYPE=`produce_image_type "$@"`
  for f in "$@"; do
    [[ "$f" =~ -T[-_a-z]+ ]] && continue
    # strip trailing ".dot"
    # NOTE: also handle trailing ".", which is what happens when you
    # tab-complete after the png already exists
    EXT=`echo $f | grep -o '[^.]*$'`  # usually just "dot", but some people call dot files .gv
    FILE=`echo $f | sed -e 's/\.[^.]*$//' -e 's/\.$//'`
    $DOT_CMD -T$IMAGE_TYPE "$FILE.$EXT" > "$FILE.$EXT.$IMAGE_TYPE" && local IMAGE_FILES="$IMAGE_FILES \"$FILE.$EXT.$IMAGE_TYPE\"" || return 1
  done &&
  if [[ `uname -a` =~ "Darwin" ]]
  then
  	eval "open $IMAGE_FILES"
  else
	eval "gnome-open $IMAGE_FILES"
  fi
}