#!/bin/bash

# Unsecure implementation of a simple encrypted file editor
# The file is saved IN PLAIN TEXT when editing,
# this script only takes care of storing the file 
# encrypted

function helpexit() {
    echo "Edit a GPG encrypted file with vim.
Unsecure implementation, since the file is saved 
        IN PLAIN TEXT when editing,
this script only takes care of storing the file 
encrypted

Changed file is always backed up as .old
"
    exit
}
[[ -z "$1" ]] && helpexit
[[ "$1" = "-h" ]] && helpexit
set -x
if [[ ! "$1" == *\.gpg ]]
then 
   echo "source is not .gpg"
   exit 1
fi
unc="${1%.gpg}"
if [ -e "$unc" ]
then echo "$unc already exists. exiting"
     exit 1
fi
if [ ! -e "$1" ]
then echo "File $1 does not exist. Creating empty file"
     echo " " > "$unc"
else 
    gpg --decrypt "$1" > "$unc"
fi

edit=`date +%s -r $unc`
if [ -s "$unc" ]
then vim -i NONE -n "$unc"    
else echo Error in decrypting
     rm "$unc"
     exit 1
fi

afteredit=`date +%s -r "$unc"`

if (( $edit != $afteredit )) 
then
    cat "$unc" | gpg -ca > "$1".tmp
    if [ -s "$1".tmp ]
    then [[ -e "$1" ]] && mv -f "$1" "$1".old
         mv -f "$1".tmp "$1"
    fi
fi
rm "$unc"