equsol

   1 #! /bin/bash
   2
   3 # Copyright (c) 2017 Agnibho Mondal
   4 # All rights reserved
   5 #
   6 # This file is part of Equsol.
   7 #
   8 # Equsol is free software: you can redistribute it and/or modify it under the
   9 # terms of the GNU General Public License as published by the Free Software
  10 # Foundation, either version 3 of the License, or (at your option) any later
  11 # version.
  12 #
  13 # Equsol is distributed in the hope that it will be useful, but WITHOUT ANY
  14 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
  15 # PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License along with
  18 # Equsol.  If not, see <http://www.gnu.org/licenses/>.
  19 #
  20 # Agnibho Mondal
  21 # contact@agnibho.com
  22 # www.agnibho.com
  23
  24 DIR="/home/agnibho/program/equsol/data/";
  25
  26 function calc {
  27         echo -e "\n$1\n";
  28         IFS="=" read LHS RHS <<< "$1";
  29         readarray -t VARS <<< "$(grep -oP "\[.*?\]" <<< "$RHS")";
  30         EQ=$RHS;
  31         for v in "${VARS[@]}"
  32         do
  33                 read -p "$(echo "$v" | sed -E "s/\[|\]//g") = " val;
  34                 if ! [[ $val =~ ^-?[0-9]+([.][0-9]+)?$ ]];then
  35                         echo "Invalid input."
  36                         exit 1;
  37                 fi
  38                 var=$(echo "$v" | sed -e 's/[]\/$*.^|[]/\\&/g');
  39                 EQ="$(echo "$EQ" | sed "s/$var/$val/g")";
  40         done
  41         RES=$(echo "$EQ"|bc -l|sed "s/0*$//g"|sed "s/\.$//g"|sed "s/^\./0./g");
  42         echo -e "\n$(echo "$LHS" | sed -E "s/\[|\]|^ | $//g") = \033[1m$RES\033[0m";
  43 }
  44
  45 if [ -f "$DIR$1" ];then
  46         EQS=();
  47         while read line;do
  48                 if grep -q "^#" <<<"$line";then
  49                         continue;
  50                 elif grep -q "=" <<< "$line";then
  51                         EQS+=("$line");
  52                 fi
  53         done < "$DIR$1"
  54         if [ ${#EQS[@]} -gt 1 ];then
  55                 for i in "${!EQS[@]}"
  56                 do
  57                         echo "($i) ${EQS[$i]}";
  58                 done
  59                 read -p "Enter equation number: " i;
  60                 if ! [[ $i =~ ^[0-9]+$ ]];then
  61                         echo "Invalid input.";
  62                         exit 1;
  63                 fi
  64                 if [ -n "${EQS[$i]}" ];then
  65                         calc "${EQS[$i]}";
  66                 else
  67                         echo "Invalid equation number.";
  68                         exit 1;
  69                 fi
  70         elif [ ${#EQS[@]} -eq 1 ];then
  71                 calc "${EQS[0]}";
  72         else
  73                 echo "No equation found";
  74                 exit 1;
  75         fi
  76 else
  77         echo "Available equations: ";
  78         ls "$DIR";
  79 fi