#!/bin/sh
#
#  Author: Pekka Riikonen <priikone@silcnet.org>
#
#  Copyright (C) 2005 Pekka Riikonen
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; version 2 of the License.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  Usage: ./fsmgraph file | dot -Tps -o outfile.ps
#
#  Graphviz dot is required to create the graphs.

##############################################################################

# Get the starts
starts=`awk '/^SILC_FSM_STATE\(/,/^}/ { next } { print }' $@ | grep "silc_fsm_start" | cut -d, -f2 | cut -d\) -f1`

# Get all states
states=`grep "^SILC_FSM_STATE(" $@ | grep -v ");" | cut -d\( -f2 | cut -d\) -f1`

# Output the graph
echo "digraph G {"

# Draw starts
for i in $starts
do
  echo "\"start $i\" [shape=plaintext];"
  echo "\"start $i\" -> $i;"
done

# Draw states and transitions
for i in $states
do
  echo "$i;"

  # This weird line gets us all state transitions and their optioanl
  # comment lines which be put as labels
  tr=`cat $@ | grep -v "^SILC_FSM_STATE($i);" | awk '/^SILC_FSM_STATE\('$i'\)/,/^}/ { if (/\/\*\* /) print; if (/silc_fsm_next/) print; }' | sed 's/^[ 	]*//; s/\\/\\*\\* /L:/; s/\\*\\///; s/silc_fsm_next/T:silc_fsm_next/' | sed '/L:/s/ /\\\\/g; /T:/s/ /\\\\/g; s/T:/T: /; s/L:/L: /'`

  # Get thread starts
  threads=`cat $@ | grep -v "^SILC_FSM_STATE($i);" | awk '/^SILC_FSM_STATE\('$i'\)/,/^}/ { if (/\/\*\*\* /) print; if (/silc_fsm_start/) print; }' | sed 's/^[ ]*//; s/\\/\\*\\*\\* /L:/; s/\\*\\///; s/silc_fsm_start/T:silc_fsm_start/' | sed '/L:/s/ /\\\\/g; /T:/s/ /\\\\/g; s/T:/T: /; s/L:/L: /'`

  # Get async calls
  asyncs=`cat $@ | grep -v "^SILC_FSM_STATE($i);" | awk '/^SILC_FSM_STATE\('$i'\)/,/^}/ { if (/SILC_FSM_CALL\(/) print; }' | sed 's/SILC_FSM_CALL(//' | cut -d= -f2 | cut -d\( -f1`

  trname=""
  label=""

  # Draw transitions
  for t in $tr
  do
    if test "$t" = "L:"; then
      label="$t"
      continue
    fi
    if test "$t" = "T:"; then
      trname="$t"
      continue
    fi
    if test "$label" = "L:"; then
      label="$t"
      continue
    fi
    if test "$trname" = "T:"; then
      trname="$t"
    fi

    # Unescape
    if test "$label"; then
      label=`echo $label | sed 's/\\\\/ /g'`
    fi
    trname=`echo $trname | sed 's/\\\\/ /g'`
    trname=`echo $trname | cut -d, -f2 | cut -d\) -f1`

    echo "$i -> $trname [label=\" $label \"];"

    trname=""
    label=""
  done

  # Draw thread transitions
  for t in $threads
  do
    if test "$t" = "L:"; then
      label="$t"
      continue
    fi
    if test "$t" = "T:"; then
      trname="$t"
      continue
    fi
    if test "$label" = "L:"; then
      label="$t"
      continue
    fi
    if test "$trname" = "T:"; then
      trname="$t"
    fi

    # Unescape
    if test "$label"; then
      label=`echo $label | sed 's/\\\\/ /g'`
    fi
    trname=`echo $trname | sed 's/\\\\/ /g'`
    trname=`echo $trname | cut -d, -f2 | cut -d\) -f1`

    echo "$i -> $trname [label=\" $label \"] [style=dotted];"

    trname=""
    label=""
  done

  # Draw async calls
  for a in $asyncs
  do
    echo "\"$a\" [shape=plaintext];"
    echo "$i -> \"$a\" [style=dotted];"
  done
done

echo "}"