[Audiodo-develop] Speed up command line parsing

[Stefano]

I'm thinking about this code to speed up command line parsing in MP3do.
ConfigMP3do will make a variable called ALL_PARAMETERS_PLUGINS containing
all parameters obtained from PARAMETERS variable of used config plugins. 

Unfortunately I must change structure of config plugins, adding a function
called control_variables_<plugin-name> to setup variables needed in
parameter overwriting check (now checking is done for general plugins
too...)
Here is some code:


# This function fill ALL_PARAMETERS_PLUGINS variable and ARR_PLUG_PARAM
# array to use like a pointer to plugin name

make_param () {
  IFS="|"
  for P in $PARAMETERS; do 
    IFS=
    ALL_PARAMETERS_PLUGINS="$ALL_PARAMETERS_PLUGINS|$P"
    indice=${#ALL_PARAMETERS_PLUGINS}
    ARR_PLUG_PARAM[$indice]="$1"
  done
}


# This function use ARR_PLUG_PARAM array searching for parameter $1 in
# ALL_PARAMETERS_PLUGINS

find_param () {
  # To handle short, long and parameters containing ":"
  if [ $(expr "$1" : ".*:.*") -eq ${#1} ]; then
    f_param="$(echo "$1"|cut -d':' -f1):"
  else
    f_param=$1
  fi
  indice=$(expr "$ALL_PARAMETERS_PLUGINS|" : ".*|$f_param|")
  if [ $indice -ne 0 ]; then
    indice=$[ indice - 1 ]
    echo "check_param_${ARR_PLUG_PARAM[$indice]}"
  fi
}


# Example of new function to be inserted in cdda2wav config plugin
control_variables_cdda2wav () {
  if [ -z "$1" ]; then
    EXTENSIONS="CDA"
    OUTPUT_FORMATS_cdda2wav="wav cdr au aiff aifc sun raw"
    PARAMETERS="cdda:|--cdda-device"
  else
    unset EXTENSIONS
    unset OUTPUT_FORMATS_cdda2wav
    unset PARAMETERS
  fi
}

# Example of new function to be inserted in atip config plugin
control_variables_atip () {
  if [ -z "$1" ]; then
    PARAMETERS="-a|--atip"
  else
    unset PARAMETERS
  fi

}


# How to call these functions...
control_variables_cdda2wav
make_param cdda2wav

control_variables_atip
make_param atip


# Now parameter $1 will be VERY quickly found! :-)
find_param "$1"


Some hint?

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