petget LN#117-162 Get package info from file name

# Lines 117 to 162 of /usr/sbin/petget (tahrpup) - https://www.pearltrees.com/s243a/source-petget-usr-sbin/id20395775/item224036691
#split PKGMAIN, ex: FULLPKGNAME=xvidtune-1.0.1-i486-1.tgz has PKGNAME=xvidtune-1.0.1
case $EXT in
  .deb)
   #deb ex: xsltproc_1.1.24-1ubuntu2_i386.deb  xserver-common_1.5.2-2ubuntu3_all.deb
   DB_nameonly="`echo -n "$PKGMAIN" | cut -f 1 -d '_'`"
   DB_pkgrelease="`echo -n "$PKGMAIN" | rev | cut -f 2 -d '_' | cut -f 1 -d '-' | rev`"
   prPATTERN="s%\\-${DB_pkgrelease}.*%%"
   PKGNAME="`echo -n "$PKGMAIN" | sed -e "$prPATTERN"`"
   DB_version="`echo "$PKGNAME" | cut -f 2 -d '_'`"
  ;;
  .pet)
   PKGNAME="$PKGMAIN"
   DB_version="`echo -n "$PKGNAME" | grep -o '\\-[0-9].*' | sed -e 's%^\-%%'`"
   xDB_version="`echo -n "$DB_version" | sed -e 's%\\-%\\\\-%g' -e 's%\\.%\\\\.%g'`"
   xPATTERN="s%${xDB_version}%%"
   DB_nameonly="`echo -n "$PKGNAME" | sed -e "$xPATTERN" -e 's%\\-$%%'`"
   DB_pkgrelease=""
  ;;
  .tgz|.txz)
   #slack ex: xvidtune-1.0.1-i486-1.tgz  printproto-1.0.4-noarch-1.tgz
   PKGNAME="`echo -n "$PKGMAIN" | sed -e 's%\\-i[3456]86.*%%' -e 's%\\-noarch.*%%'`"
   DB_version="`echo -n "$PKGNAME" | grep -o '\\-[0-9].*' | sed -e 's%^\\-%%'`"
   xDB_version="`echo -n "$DB_version" | sed -e 's%\\-%\\\\-%g' -e 's%\\.%\\\\.%g'`"
   xPATTERN="s%${xDB_version}%%"
   DB_nameonly="`echo -n "$PKGNAME" | sed -e "$xPATTERN" -e 's%\-$%%'`"
   DB_pkgrelease="`echo -n "$PKGMAIN" | sed -e 's%.*\\-i[3456]86%%' -e 's%.*\\-noarch%%' -e 's%^\\-%%'`"
  ;;
  .tar.gz)
   #arch ex: xproto-7.0.14-1-i686.pkg.tar.gz  trapproto-3.4.3-1.pkg.tar.gz
   PKGNAME="`echo -n "$PKGMAIN" | sed -e 's%\\-i[3456]86.*%%' -e 's%\\.pkg$%%' | rev | cut -f 2-9 -d '-' | rev`"
   DB_version="`echo -n "$PKGNAME" | grep -o '\\-[0-9].*' | sed -e 's%^\\-%%'`"
   xDB_version="`echo -n "$DB_version" | sed -e 's%\\-%\\\\-%g' -e 's%\\.%\\\\.%g'`"
   xPATTERN="s%${xDB_version}%%"
   DB_nameonly="`echo -n "$PKGNAME" | sed -e "$xPATTERN" -e 's%\\-$%%'`"
   DB_pkgrelease="`echo -n "$PKGMAIN" | sed -e 's%\\-i[3456]86.*%%' -e 's%\\.pkg$%%' | rev | cut -f 1 -d '-' | rev`"
  ;;
  .rpm) #110523
   #exs: hunspell-fr-3.4-1.1.el6.noarch.rpm
   PKGNAME="$PKGMAIN"
   DB_version="`echo -n "$PKGNAME" | grep -o '\\-[0-9].*' | sed -e 's%^\-%%'`"
   xDB_version="`echo -n "$DB_version" | sed -e 's%\\-%\\\\-%g' -e 's%\\.%\\\\.%g'`"
   xPATTERN="s%${xDB_version}%%"
   DB_nameonly="`echo -n "$PKGNAME" | sed -e "$xPATTERN" -e 's%\\-$%%'`"
   DB_pkgrelease=""
  ;;
esac