a util to display the contents of a ruby gemfile

gemcat

#!/bin/bash

set -u

GEM=$1 

if ! echo $GEM | egrep -qi '\.gem$'; then
  echo $1 does not end in .gem
  exit 1
fi

trap '' INT

TMPDIR=~/tmp/gemcat
mkdir -p $TMPDIR
CONTENTS=$(mktemp -d)

echo $CONTENTS
echo ------------------------------------------
echo 
tar xf $GEM -C $CONTENTS

pushd $CONTENTS 


for file in *; do 
        echo $file 
        echo ------------------------------------------- 
        echo 

        case "$file" in 
                *.tgz|*.tar.gz)
                        tar tfvz $file 
                        ;; 
                *.gz) 
                        zcat < $file 
                        ;; 
                *) 
                        echo "unhandled" $file ;e 
        esac 
        echo
done 

popd

rm -rf $CONTENTS