#! /bin/bash
#
# author sudodus alias nio-wiklund at launchpad
#
# date        editor   comment
# 2013-08-14  sudodus  created selector
# 2013-08-14  sudodus  changed name to select-tarball
# 2013-09-01  sudodus  converted for dialog
# 2013-11-08  sudodus  more clear what is the default
# 2013-11-08  sudodus  own directory for tarballs (plus symlink)
# 2015-04-13  sudodus  fix for live session & persistence: tarstr=...
#-----------------------------------------------------------------------------

function special-tarball-select {
# check for tarballs
if [ -d "/tarballs" ]
then
  tarpath="/tarballs"
elif [ -d "${HOME}/tarballs" ]
then
  tarpath="${HOME}/tarballs"
elif [ -d "${PWD}/tarballs" ]
then
  tarpath="${PWD}/tarballs"
else
  echo "Error finding the tarball path"
  tarpath="${HOME}"
fi

echo hello > /tarballs/hello-xyz.txt 2> /dev/null
if [ $? -eq 0 ]
then
 rm /tarballs/hello-xyz.txt
 tarstr="${tarpath}"/*.tar.[gx]z
else
 tarstr=$(find / -name "*.tar.[gx]z")
fi

for i in $tarstr
do
 item=$(($item + 1))
 seltxt="$seltxt$item \"$i\" " 
done

# select tarball, go or quit

ans=$(dialog --backtitle 'Select tarball - avoid spaces in tarball names' \
--title "Please select a tarball with the arrow keys, scroll if necessary" \
--default-item $choice --colors --menu "Available tarballs" 17 76 $(($item + 1)) \
$seltxt q "Quit, no tarball selected" 3>&1 1>&2 2>&3 3>&- )

choice="$ans"

item=0
for i in $tarstr
do
 item=$(($item + 1))
 targ0="$i"
 if [ "$item" == "$choice" ]
 then
  target=$targ0
 fi
done

if [ "$ans" == "q" ] || [ "$ans" == "" ]
then
 > "$selected"
 exit
fi

# write selection

# echo "choice=$choice"
# echo "$target"
echo "$target" > "$selected"
}

function general-file-select {

#echo $tarball
if test -f "$tarball"
then
 choice="$tarball"	
else
 choice="$PWD/"
fi

ans=$(dialog --backtitle \
'space-bar: copy selection to text-entry window, slash: show directory content' --no-shadow \
--fselect "$choice" 8 78  3>&1 1>&2 2>&3 3>&- )

target="$ans"

# write selection

#echo "$target"
echo "$target" > "$selected"
}

## main program ##############################################

# variables

choice=1
cnt=
target=
tarball=
LC_ALL=C
LANG=C

# usage

if [ "$(whoami)" != "root" ]
then
 echo "Usage:"
 echo "Select tarball to use with the One Button Installer"
 echo "sudo $0"
 exit
fi

# check for previous selection
if [ -f /usr/share/OBI/selected ]
then
  selected="/usr/share/OBI/selected"
elif [ -f "${HOME}"/selected ]
then
  selected="${HOME}/selected"
elif [ -d "${PWD}/selected" ]
then
  selected="${PWD}/selected"
else
  selected="selected"
  echo "Error finding the OBI selected path"
fi

if test -s "$selected"
then
 read tarball < "$selected"
fi

# check for tarballs
if [ -d "/tarballs" ]
then
  tarpath="/tarballs"
elif [ -d "${HOME}/tarballs" ]
then
  tarpath="${HOME}/tarballs"
elif [ -d "${PWD}/tarballs" ]
then
  tarpath="${PWD}/tarballs"
else
  echo "Error finding the tarball path"
fi

item=0
for source in "${tarpath}"/*.tar.[gx]z
do
 item=$(($item + 1))
 if ! test -f "$source"
 then
  dialog --backtitle "One Button Installer - Select tarball" --msgbox \
  "No tarball found (tarballs/filename.tar.gz)" 0 0
  tarball=
  general-file-select
  exit
 elif ! test -s "$source"
 then
  ans=$(dialog --backtitle "One Button Installer - Select tarball" \
  --yesno "Zero sized tarball found ($source)\n
  Remove it? (y/n)" 0 0 \
  3>&1 1>&2 2>&3 3>&- )
  if [ "$?" == "0" ]
  then
   sudo rm "$source"
  else
   exit
  fi
 elif [ "$tarball" == "$source" ]
 then
  choice=$item
 fi
done

# list for selection

ans=
item=0
cmdsav=
seltxt=

# select function

ans=$(dialog --backtitle "One Button Installer - Select tarball" \
--yes-label "Tarball selector (easy)" --no-label "General File selector (difficult)" \
--yesno "Select tarballs in standard directory (easy), or\n
anywhere with the general file selector (difficult)?" 0 0 \
3>&1 1>&2 2>&3 3>&- )

if [ "$?" == "0" ]
then
 special-tarball-select
else
 general-file-select
fi