SavePath - a small script to set SRM and STATE location on the fly

[cyperghost]

I think there is not much to say
Please read the bash description and you will be fine ;)

You need the script add to runcommand-onstart.sh and parse parameters to it.

1. Save the code from box below to a place you like maybe /home/pi/RetroPie/scripts/SavePath.sh

2. Make the script executable with chmod +x home/pi/RetroPie/scripts/SavePath.sh

3. Enter nano /opt/retropie/configs/all/runcommand-onstart.sh

4. Enter line /home/pi/RetroPie/scripts/SavePath.sh "all" "/home/pi/RetroPie/savegames/$1"

   4.1 Parameter 1 - which retroarch.cfg should be used? (mandatory)
   4.1.1 choose between all and $1 MANDATORY parameter
   4.1.2 all uses parameters from /opt/retroarch/configs/all/retroarch.cfg
   4.1.3 $1 uses parameters called by ROM. So if you start a NES-ROM /opt/retroarch/configs/nes/retroarch.cfgis used

   4.2 Parameter 2 - Where to store savestates? (mandatory)
   4.2.1 This parameter build path for SAVESTATES!
   4.2.2 $1 = systemname (fba, gb...) this may help you to build pathes for each system - try it out MANDATORY parameter

   4.3 Paramter 3 - Where to store SRM saves? (optional)
   4.3.1 This parameter build path for SRM files!
   4.3.2 $1 = systemname (fba, gb...). So you can save STATES and SRM in two different places.
   4.3.3 If this parameter is empty then SRM location is STATE location!

5. You need to activate the two save key in retroarch.cfg with nano /opt/retropie/configs/all/retroarch.cfg if you use the allparameter. Otherwise do it per system!
   5.1 savefile_directory = ""
   5.2 savestate_directory = ""

#!/bin/bash
# Save Path v1.1
# Change SavePath of SRM and STATE-files
# 29.01.2018
#
# by cyperghost for retropie.org.uk
#
# This script is intended to set automatically pathes to SRM and STATE files
# therefore 3 parameters got to be pathed to this
# Parameter 1: all or $1 (for system) > This sets retroarch.cfg system specific or all
# Parameter 2: Save path of ROM Savegames maybe '/home/pi/RetroPie/savegames/$1'
# Parameter 3: Save path of SRM Savegames maybe '/home/pi/RetroPie/savegames/$1/SRM'
#
# I differ between SRM and STATE-path if SRM parameter (Parameter 3) is NOT left empty
# If parameter 3 is missing then SRM will be in the same location as STATE.
#
# Example 1: SavePath.sh all "/home/pi/RetroPie/savegames/$1" with a NES ROM
# results: SRM and STATE savepath '/home/pi/RetroPie/savegames/nes'
# retroarch.cfg in /opt/retropie/configs/all will be used!
#
# Example 2: SavePath.sh $1 "home/pi/Retropie/savegames/$1" with a NES ROM
# results: SRM and STATE savepath '/home/pi/RetroPie/savegames/nes'
# but retroarch.cfg in /opt/retropie/configs/nes will be used!
#
# Example 3: SavePath.sh $1 "home/pi/Retropie/savegames/$1" "home/pi/Retropie/savegames/$1/SRM"
# with a NES ROM results: STATE savepath '/home/pi/RetroPie/savegames/nes'
# and SRM will be saved to '/home/pi/RetroPie/savegames/nes/SRM'
# but retroarch.cfg in /opt/retropie/configs/nes will be used!
#
# Example 4: SavePath.sh all "home/pi/Retropie/savegames/$1" "home/pi/Retropie/savegames/$1/SRM"
# with a NES ROM results: STATE savepath '/home/pi/RetroPie/savegames/nes'
# and SRM will be saved to '/home/pi/RetroPie/savegames/nes/SRM'
# and retroarch.cfg in /opt/retropie/configs/all will be used!
#
# Example 5: SavePath.sh all "home/pi/Retropie/savegames" with all ROMs 
# results: STATE savepath '/home/pi/RetroPie/savegames/'
# and SRM will be saved to '/home/pi/RetroPie/savegames/'
# retroarch.cfg in /opt/retropie/configs/all will be used!
# All ROMs of all systems will be saved there
#
# create or uncomment keys for 'savefile_directory = ""' and 
# 'savestate_directory = ""' by your own!
# I don't want to mess up anything with your config!

[ -z "$1" ] && echo "SavePath Check: Please parse 'all' or '$1'! Error!" >&2 && exit 1
[ -z "$2" ] && echo "SavePath Check: Please parse full path for save location!" >&2 && exit 1
[ "${1:0:1}" = "/" ] && echo "SavePath Check: You likely entered a path location! Please parse 'all' or '$1'! Error!" >&2 && exit 1

    state_path="$2"
    srm_path="$3"
    [ -z "$3" ] && srm_path="$2"
      
    config_dir="/opt/retropie/configs/$1"
    config_file="$config_dir/retroarch.cfg"

# Get Config State, if there is an error then exit
func_get_config() {
    config="$(grep -Po "(?<=^$1 = ).*" "$config_file")"

    # Check for string config if it's empty then exit
    # else remove quotation marks
    [ -z "$config" ] && echo "SavePath Check: config Key: $1 in $config_file not found! Exit!" >&2 && exit 1
    config="${config%\"}"
    config="${config#\"}"

    # This is tricky!
    # The ~ is a shortage to the HOME directory
    # RetroPie is used to save the home dir as '~/RetroPie...'
    # So I check for presence, remove it and expand it again
    [ "${config:0:1}" = "~" ] && config="${config#??}" && config=~/"$config"
}

# Write to config
func_set_config() {
    sed -i "s|^\($1\s*=\s*\).*|\1\"$2\"|" "$config_file"
#    echo "\"$1\" set to \"$2\"."
}

# ---------------------------  M  A  I  N  ---------------------------

    [ -z "${state_path##*/}" ] && state_path="${state_path%?}"     # Remove last / character from pathes
    [ "${state_path:0:1}" != "/" ] && echo "SavePath Check: No valid path for save STATE location entered!" >&2 && exit 1
    [ -z "${srm_path##*/}" ] && srm_path="${srm_path%?}"           # Remove last / character from pathes
    [ "${srm_path:0:1}" != "/" ] && echo "SavePath Check: No valid path for save SRM location entered!" >&2 && exit 1

    func_get_config "savefile_directory"
        if [ "$config" != "$srm_path" ]; then
            func_set_config "savefile_directory" "$srm_path"
            mkdir -p "$srm_path"
        fi

    func_get_config "savestate_directory"
        if [ "$config" != "$state_path" ]; then
            func_set_config "savestate_directory" "$state_path"
            mkdir -p "$state_path"
        fi