BASH INI file parser

parse_ini.sh

#!/usr/bin/env bash

inifile="${1}";

# ini file exists
if [[ -f "${inifile}" ]]; then

  # file is not empty
  if [[ -s "${inifile}" ]]; then

    # default section
    inisection="main";

    # read file line by line
    while read -r iniline; do

      # line contains section name []
      if [[ "${iniline}" =~ ^[[:space:]]*\[[[:alnum:]]+\] ]]; then

        # line with section name
        inisection=$( echo -e "${iniline}" | tr --delete --complement '[:alnum:]_' );

      else

        # key/value pair separated by =
        if [[ "${iniline}" =~ .+=.+ ]]; then

          # remove special characters from key name
          inikey=$( echo -n "${iniline%=*}" | tr --delete --complement '[:alnum:]_' );

          # delete only leading and trailing spaces from value
          inivalue=$( echo -n "${iniline#*=}" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' );

          # delete only leading and trailing double quotes from value (for BASH)
          inivalue=$( echo -n "${inivalue}" | sed -e 's/^["]*//' -e 's/["]*$//' );

          # delete only leading and trailing single quotes from value (for SQL)
          sqlvalue=$( echo -n "${inivalue}" | sed -e "s/^[']*//" -e "s/[']*$//" );

          # replace double quotes with escaped quotes (for BASH)
          inivalue=$( echo -n "${inivalue}" | sed -e 's/"/\\"/g' );

          # replace single quotes with two single quotes (for SQL)
          sqlvalue=$( echo -n "${sqlvalue}" | sed -e "s/'/''/g" );



          # output (for BASH)
          echo "I_${inisection^^}_${inikey^^}=\"${inivalue}\";";

          # output (for SQL)
          echo -e "DEFINE I_${inisection^^}_${inikey^^} := '${sqlvalue}';";

          echo;

        fi

      fi

    # all lines from ini files, except ; comments
    done < <( grep --invert-match --extended-regexp '^[[:space:]]*;' "${inifile}" );

  else
    echo "file ${inifile} is empty";
    exit 1;
  fi

else
    echo "file ${inifile} not found";
    exit 1;
fi