dot-render

#!/usr/bin/env bash
#
# Render & view a DOT file.
#

fmt="png"
dot_renderer="dot"

_BASHPLATE_DIR="$HOME/.local/share/bashplate"
source "$_BASHPLATE_DIR/bashplate.sh"

_usage="\
Usage: $_FILENAME [options] FILE
Render a DOT file to a PNG & optionally view.

  Options:
    -f, --output <file>     write to <file>
    -o, --open              open the rendered file
    -v, --verbose           be verbose
    -h, --help              display this help text and exit

If --open is specified without --output <file>, the image is rendered to a
temporary file.\
"

while getopts_long :vhof: opt \
    verbose 0 \
    help 0 \
    open 0 \
    output 1 \
    "" "$@"
do
    case "$opt" in
        v|verbose) _VERBOSE=$(($_VERBOSE + 1)) ;;
        h|help) _print_usage 0 ;;
        :) _err "$OPTLERR"; _print_usage 1 ;;

        o|open) _open_after=true ;;
        f|output) outfile="$OPTLARG" ;;
    esac
done
shift $((OPTLIND-1))

if [[ $# != 1 ]]; then
    _err "expected exactly 1 argument" 2
fi

infile="$1"
if [[ ! -f "$infile" ]]; then
	_err "not a file: $infile" 3
fi

if [[ ! "$outfile" ]]; then
    if [[ $_open_after ]]; then
        # no output file & opening: use temporary file
        outfile="$(mktemp --suffix=".$fmt")"
    else
        # render next to file
        outfile="${infile%.*}.$fmt"
    fi
fi



$dot_renderer "$infile" -T "$fmt" -o "$outfile"

if [[ $? != 0 ]]; then
    _err "dot failed (see above)" 4
fi

if [[ $_open_after ]]; then
    $FILE_OPENER "$outfile"
fi