Generate gem dependencies. You need to have graphviz installed

dependencies.sh

#!/usr/bin/env bash
if [ $# -eq 0 ] ; then
    printf "%s\n" "no args given, exiting" 
    exit 1
fi
export TMP_GEM_PATH=/tmp/$1
mkdir -p 
GEM_HOME=$TMP_GEM_PATH GEM_PATH=$TMP_GEM_PATH gem install $1
GEM_HOME=$TMP_GEM_PATH GEM_PATH=$TMP_GEM_PATH gem list \
    | cut -d\  -f1 \
    | xargs gem dep \
    | grep -v development\) \
    | awk '\
        BEGIN { print "digraph gems {" } \
        /^Gem / { cur=$2; sub(/-[0-9\.]+$/, "", cur); print "  \"" cur "\";" } \
        ! /^Gem / && $0 != "" { print "  \"" cur "\" -> \"" $1 "\";" } \
        END { print "}" }' \
    | dot -Tpng -o gems.png
rm -rf $TMP_GEM_PATH