Reconstruct

#!/bin/bash
#
# Reconstruct: Build a new terminal out of an old TR state dump.
# Karl Kleinpaste, Just Research, February/March 1999.
#
# Usage: Reconstruct [-n] [-r] [dump]
# -n: no destruction of reconstruction source files.
# -r: start TR in the reconstructed shell.
# No dump specified -> use stdin
#
if [ "$1" = "-h" ] ; then
    echo Usage: "$0" [-h] [-n] [-r] [dumpfile]
    echo ' '-h: this help.
    echo ' '-r: start Recall in reconstructed shell.
    echo ' '-n: no source file destruction.
    exit 1
fi
#
newrecall='#'
save=''
while [ "$1" = "-n" -o "$1" = "-r" ] ; do
    case "$1" in
	-n ) shift ; save='#'     ;;
	-r ) shift ; newrecall='' ;;
    esac
done
#
# make working files in a sensible directory.
TMPDIR="${RECALL_DUMP:-/tmp}"
mkdir -p "$TMPDIR"
#
# identify program for stuffing a command into the pty.
STI=sti
#
# get the dump file, either argv1 or stdin.
if [ "$#" -eq 0 ] ; then
    TMP=""$TMPDIR"/reconstruct.data-$$"
    trap "rm \"$TMP\"" EXIT
    cat - > "$TMP"
else
    TMP="$1"
    shift
fi
if [ "$#" -ne 0 ] ; then
    echo Usage: 'Reconstruct -n [dump]'
    exit 1
fi
#
# get geometry.
GEOMETRY="`sed -e 's/\r$//' < \"$TMP\" | grep -e '^-geometry [0-9]\+x[0-9]\+$' | head -1`"
case "$RECALL_TERM_PROG" in
    xterm)
      # ok as is.
      ;;
    gnome-terminal)
      # the ongoing braindamage of the gtk/gnome people.
      echo gnome-terminal no longer accepts --geometry option'?!?'
      exit 1
      ;;
    mate-terminal)
      # tweak argument slightly.
      GEOMETRY="`echo $GEOMETRY | sed -e 's/-geometry /--geometry=/'`"
      ;;
    *) echo RECALL_TERM_PROG "($RECALL_TERM_PROG)" is unknown. && exit 1 ;;
esac
#
# define the temporary files to be inhaled and run.
export RECON="$TMPDIR"/"reconstruct.script-$$"
export HISTFILE="$TMPDIR"/"reconstruct.history-$$"
#
# extract the history.
sed -e 's/\r$//' -e '1,/^--history-begin$/d' -e '/^--history-end$/,$d' -e 's/^ *[0-9]*  //' < "$TMP" > "$HISTFILE"
# (nothing more need be done w/history -- bash will find it on its own.)
#
# create the startup script.
#   fix histfile problem first.
export defunctHISTFILE="$HISTFILE"
#   tell user what's up.
cat > "$RECON" <<EOF
clear
echo ==================================
echo Total Recall: Shell Reconstruction
echo ==================================
echo Verify your directory stack before employing '~'digit.
${save}echo Reconstruction removes the environment source files.
${newrecall}echo Total Recall has been initialized within this shell.
echo ''
#
EOF
#   must make environment into export assignments.
#   - extract env
#   - escape existing single quotes
#   - prepend "export"
#   - add single quotes to values.
sed -e 's/\r$//' \
    -e '1,/^--environment-begin$/d' \
    -e '/^--environment-end$/,$d' \
    -e "s/'/\\\\'/g" \
    -e "s/^\([A-Za-z_]\)/export \1/" \
    -e "s/=/='/" \
    -e "s/$/'/" < "$TMP" >> "$RECON"
eval `grep RECALL_TIMESTAMP "$RECON"`
#   get dirstack elements.
dirlist="`sed -e 's/\r$//' -e '1,/^--dirstack-begin$/d' -e '/^--dirstack-end$/,$d' < \"$TMP\"`"
#   add dirstack initialization.
cat >> "$RECON" <<EOF
#
declare -a dirlist
dirlist=($dirlist)
dirnum=\${#dirlist[*]}
dcmd="builtin cd"
while [ "\$dirnum" -gt 0 ] ; do
    \$dcmd \${dirlist[\$dirnum-1]} > /dev/null
    dcmd="builtin pushd"
    dirnum=\$[\$dirnum-1]
done
echo -ne "\033]0;Total Recall: Shell Reconstruction ${RECALL_TIMESTAMP}\007"
${save}rm "\$RECON" "\$defunctHISTFILE"
${newrecall}. Recall
unset RECON defunctHISTFILE dcmd dirlist dirnum
EOF
#   needs to be executable.
chmod 700 "$RECON"
#
# start a terminal, with proper geometry, initialized from startup.
cd
cmd="bash -c \"stty -echo ; $STI \\\". $RECON
\\\" ; stty echo ; exec $SHELL\""
"$RECALL_TERM_PROG" $GEOMETRY -e "$cmd" < /dev/null > /dev/null 2>&1 &
exit 0