curse.bash

#!/bin/bash

# Shutdown the program and delete all tmp files
function shutdown {
    # Cleanup
    [ -d $TMP ] && rm -fr $TMP
    exit 0
}

# Never run this program as root
if [[ $EUID -eq 0 ]]; then
    echo >&2 "This program should never be run using sudo or as the root user!\n"
    exit 1
fi

# Basic variables
warning=0
VERSION=2
BACKTITLE="Alternative Downloader for Curse Minecraft Modpacks V0.3"
MMCDIR=""
MMCBIN=""

# Check for needed programs
if [ "$(which jq)" = "" ] || [ "$(which recode)" = "" ] || [ "$(which dialog)" = "" ]; then
    echo >&2 "You are missing one or more of the following programs:"
    echo >&2 "- jq (Processing json data on the command line)"
    echo >&2 "- recode (Translate html encoded text back to ascii)"
    echo >&2 "- dialog (Show some fancy GUI on the command line)"

    while true; do
        read -p "Do you wish to install the missing programs? " yn
        case $yn in
            [Yy]* )
                if [ ! "$(which apt-get)" = "" ]; then
                    sudo apt-get -y install jq recode dialog;
                elif [ ! "$(which pacman)" = "" ]; then
                    sudo pacman -S jq recode dialog
                elif [ ! "$(which yum)" = "" ]; then
                    sudo yum install jq recode dialog
                elif [ ! "$(which zypper)" = "" ]; then
                    sudo zypper jq recode dialog
                elif [ ! "$(which emerge)" = "" ]; then
                    sudo emerge jq recode dialog
                else
                    echo "There is no known package manger installed. Please install the programs manually and start this program again!"
                    exit 1
                fi
                break
            ;;
            [Nn]* ) exit 1;;
            * ) echo "Please answer yes or no.";;
        esac
    done
fi

# Reading existing config
if [ -r /tmp/curse_downloader_config ]; then
  . /tmp/curse_downloader_config
fi

if [ "$warning" -lt "$VERSION" ] ; then
    dialog --backtitle "$BACKTITLE" --title "What is this?" --yesno "\
\nWelcome! This is my alternative installer for Minecraft mod packs \
hosted on curse.com. Unfortunately the curse launcher is only available \
on Windows at the moment. Providing modpacks for Linux is a pain for \
the modpack authors and the users. This program is intended to make \
this a bit easier for you.\n\n\
This program was written by EfficiencyVI. It is not related, maintained \
or affiliated with curse.com. It is also in an early development. That \
means expect it to not work, show odd errors, destroy your data or kill \
your hamster!\n\n\
I put a lot of effort in ensuring that this program works as best as \
possible and I'm pretty sure everything will work for you. But I will \
take no resposibility or guarantee that everything goes wrong no matter \
if you use it correct or not.\n\n\
Only if you are okay to be a test bunny click \"Yes\" to proceed!" 30 70

    # Read response from dialog
    dialog=$?
    case $dialog in
        1|255) exit 1;;
        *) echo "warning=$VERSION" >> /tmp/curse_downloader_config;;
    esac
fi

# Start a new installation
# Create temp file for menus and temp data
TMP=/tmp/curse.$$
INPUT=$TMP/input
OUTPUT=$TMP/output

mkdir $TMP > /dev/null 2>&1
rm -fr $TMP/* > /dev/null 2>&1
mkdir $TMP/modpack > /dev/null 2>&1

# Check for installation path
# Fixes issue #1 Thanks to marcmagus 
loc=($(ls -a $HOME | grep -i "multimc"))
for i in "${!loc[@]}"
do
    # Skip standard folder and use as fallback
    if [ "${loc[i]}" = ".MultiMC" ] ; then
        MMCDIR=$HOME"/.MultiMC"
        MMCBIN=$MMCDIR"/MultiMC"
        continue
    fi
    if [ -d $HOME/${loc[i]}/instances ] ; then
        dialog --backtitle "$BACKTITLE" --title "Possible installation of MultiMC found" --yesno "\
\nThere is a possible installation of MultiMC on your system. The folder is located \
in $HOME/${loc[i]}.  \
\n\nMost likely this program was installed by a software manager or by yourself. \
If you are not sure about this select \"No\" to search for more possible installations \
or install the program in the default directory. \
\n\nIf you want to use this installation select \"Yes\". \"No\" will search for more \
MultiMC instances or use an existing standard installation or install it for you." 30 70

        # Read response from dialog
        dialog=$?
        case $dialog in
            0) 
                MMCDIR=$HOME/${loc[i]}
                if [ -x $HOME/${loc[i]}/MultiMC ] ; then
                    MMCBIN=$HOME/${loc[i]}/MultiMC
                else
                    # find alternative binary location (for the real weird)
                    locb=(${PATH//:/ })
                    for j in "${!locb[@]}"
                    do
                         tmpb=$(ls ${locb[j]} | grep -i "multimc")
                         echo $tmpb
                         if [ ! "$tmpb" = "" ] && [ -x ${locb[j]}/$tmpb ] ; then
                            dialog --backtitle "$BACKTITLE" --title "Possible binary of MultiMC found" --yesno "\
\nThere is a possible binary file of MultiMC in ${locb[j]}/$tmpb. Do you want to use this binary?" 30 70
                            dialogb=$?
                            case $dialogb in
                                0)
                                    MMCBIN=${locb[j]}/$tmpb
                                    break
                                ;;
                            esac
                         fi
                    done
                fi
                break
                ;;
        esac
    fi
done

if [ "$MMCDIR" = "" ] || [ "$MMCBIN" = "" ] ; then
    dialog --backtitle "$BACKTITLE" --title "An error occured" --msgbox "\
\nOh oh! Sorry, but I could not determine a suitable installation location \
or binary file. If you don't know what to do. No panic! \
\n\n1.) Restart this program \
\n2.) Select \"No\" when it shows you an existing installation on your system \
\n3.) Install MultiMC in the default location" 30 70
fi

# Only offer installation if standard path was not changed
# and MultiMC is not installed
if [ "$MMCDIR" = "" ] && [ ! -d $HOME/.MultiMC/ ] ; then
    dialog --backtitle "$BACKTITLE" --title "About MultiMC" --yesno "\
\nMultiMC is an alternative launcher for Minecraft. It gives you a lot \
of options to manage multiple instances of Minecraft like Modpacks, \
Vanilla customization and so on. It is the easiest way to make custom \
modpacks running on your computer.\n\n\
If you click yes this program will try to download the correct version \
for your plattform. The software is installed in your home directory in \
the \".MultiMC\" folder.\n\nIf you want to know more about MultiMC visit \
the official website and support the authors. https://multimc.org" 30 70
    
    # Read response from dialog
    dialog=$?
    case $dialog in
        0) 
            if [ ! -d ~/.MultiMC/ ]; then
                if [ $(getconf LONG_BIT) = "64" ]; then
                    URL="https://files.multimc.org/downloads/mmc-stable-lin64.tar.gz"
                else
                    URL="https://files.multimc.org/downloads/mmc-stable-lin32.tar.gz"
                fi
                wget -O $TMP/MultiMC.tar.gz "$URL" 2>&1 | \
                stdbuf -o0 awk '/[.] +[0-9][0-9]?[0-9]?%/ { print substr($0,63,3) }' | \
                dialog --backtitle "$BACKTITLE" --title "MultiMC setup" --gauge "Downloading MultiMC" 10 100
                
                tar -xzf $TMP/MultiMC.tar.gz -C $TMP
                mkdir $HOME/.MultiMC
                cp -r $TMP/MultiMC/* $HOME/.MultiMC/
                MMCDIR=$HOME"/.MultiMC"
                MMCBIN=$MMCDIR"MultiMC"
            fi
            ;;
       *)
            if [ "$MMCDIR" = "" ] || [ "$MMCBIN" = "" ] ; then
                dialog --backtitle "$BACKTITLE" --title "An error occured" --msgbox "\
\nOh oh! Sorry, but I could not determine a suitable location for MultiMC. \
If you don't know what to do, restart this program and select the standard \
installation for your system." 30 70
                shutdown
            fi
    esac
fi

for i in $(seq 1 10)
do
    wget --quiet -O - https://mods.curse.com/modpacks/minecraft?page=$i | sed -n -e 's!.*<li class="title"><h4><a href="\/modpacks\/minecraft/\(.*\)">\(.*\)<\/a>.*!\1 \2!p' >> $OUTPUT
done
echo "999999 other" >> $OUTPUT

MODPACKS=()
while read id name ; do
    MODPACKS+=($id "$name")
done < $OUTPUT

while true; do
    dialog --backtitle "$BACKTITLE" --title "Select modpack!" --menu "\
\nSome popular packs are already preinstalled in this program. Just \
use the up and down keys to select the modpack you want. If your \
desired modpack is not in the list choose other for more options.\n\n" 30 70 20 \
  "${MODPACKS[@]}" \
  2>"${INPUT}"
    menuitem=$(<"${INPUT}")

    if [ "$menuitem" = "" ]; then
        shutdown
    fi

    if [ "$menuitem" = "999999" ]; then
        dialog  --backtitle "$BACKTITLE" --title "Custom mod pack" --inputbox "\
\nPlease add id of the mod pack on curse, e. g. \
http://www.curse.com/modpacks/minecraft/229330-crash-landing-1-6-4 would be 229330. \
Just type in the number!" 30 70 2>"${INPUT}"
        menuitem=$(<"${INPUT}")
    fi
    #menuitem=$menuitem | sed 's/[^0-9]*//g'
    
    # TODO: Version selection
    URL="https://mods.curse.com/modpacks/minecraft/$menuitem"

    TITLE=$(wget --quiet -O - "$URL" | sed -n -e 's!.*<title>\(.*\) - \(.*\) - Minecraft Modpacks - Curse.*!\1!p' | recode html..ascii)

    if [ ! "$TITLE" = "" ]; then
        break
    fi
done

DLURL=$(wget --quiet -O - $URL/download | sed -n -e 's!.*<a data-project="\(.*\)" data-file="\(.*\)" data-href="\(.*\)" class="download-link" href="#">click here.*!\3!p' | recode html..ascii)

wget -O $TMP/tmp.zip "$DLURL" 2>&1 | \
 stdbuf -o0 awk '/[.] +[0-9][0-9]?[0-9]?%/ { print substr($0,63,3) }' | \
 dialog --backtitle "$BACKTITLE" --title "Downloading Modpack" --gauge "\n Downloading \"$TITLE\"" 10 100

# TODO MD5 verification

echo "0" | dialog --backtitle "$BACKTITLE" --title "Preparing files" --gauge "Please wait" 10 100
unzip $TMP/tmp.zip -d $TMP/modpack > /dev/null 2>&1

# Fix overrides folder - some packs contains wrongly cased one

overdir=$(/bin/ls -1 "$TMP/modpack/" | grep -i overrides | head -n1)

if [ "$overdir" != "overrides" ]; then
  mv "${TMP}/modpack/${overdir}" "${TMP}/modpack/overrides"
fi

echo "100" | dialog --backtitle "$BACKTITLE" --title "Preparing files" --gauge "Please wait" 10 100

FILE=$TMP/modpack/manifest.json
TO=$(cat $FILE | jq '.files | length')
MP=$(cat $FILE | jq '.name' | sed 's/^.\(.*\).$/\1/')
VER=$(cat $FILE | jq '.version' | sed 's/^.\(.*\).$/\1/')
AUTHOR=$(cat $FILE | jq '.author' | sed 's/^.\(.*\).$/\1/')
MVER=$(cat $FILE | jq '.minecraft.version' | sed 's/^.\(.*\).$/\1/')
FVER=$(cat $FILE | jq '.minecraft.modLoaders[0].id' | sed 's/^.forge-\(.*\).$/\1/')
f=0

mkdir -p "$MMCDIR/instances/$MP ($VER)" > /dev/null 2>&1
cat >"$MMCDIR/instances/$MP ($VER)/instance.cfg" <<EOL
InstanceType=OneSix
name=${MP} (${VER})
IntendedVersion=${MVER}
MaxMemAlloc=2048
MinMemAlloc=2048
PermGen=256
OverrideMemory=true
EOL
echo <<< EOL

while true; do
    if [ -f "$MMCDIR/instances/$MP ($VER)/patches/net.minecraftforge.json" ] && [ $(cat "$MMCDIR/instances/$MP ($VER)/patches/net.minecraftforge.json" | grep $FVER | wc -l) -gt "0" ]; then
        break
    else
        dialog --backtitle "$BACKTITLE" --title "How to set up MultiMC!" --msgbox "\
\n!!! IMPORTANT !!! Please read carefully !!!\n\nMultiMC was downloaded \
to your system and this program will try to configure everything for you \
as best as possible for you. But there is one manual step on the way. You \
will have to do the following:\
\n\nAfter you pressed on \"OK\" MultiMC will open automatically. There is \
already an instance \"$MP ($VER)\" added for you. Right click the icon in \
the overview and click on \"Edit instance\".\n\n\
Click on \"Install Forge\" on the right of the window. After that select \
version $FVER!\n\nIt is important that you select the right version because \
the installation will not proceed unless the correct forge version is detected. \
After you selected the right version close MultiMC and the installation can \
finish.\n\nIf you get back to this screen after you closed the program \
something went wrong. Most likely you picked the wrong version." 30 70
        bash $MMCBIN
    fi
done

modnames+=( "" )
for i in $(seq $TO)
do
        echo $((100/$TO*$i)) | dialog --backtitle "$BACKTITLE" --title "Generating Modlist" --gauge "\
\nUnfortunately Curse does not provide the Mod names in the configuration file. \
To make the list usable for you all the names are now downloaded from the curse \
page. Depending on the number of mods this may take a while." 10 100
        REQ=$(cat $FILE | jq '.files['$i-1'].required')
        PID=$(cat $FILE | jq '.files['$i-1'].projectID')
        TITLE=$(wget --quiet -O - https://minecraft.curseforge.com/mc-mods/$PID | sed -n -e 's!.*<title>Overview - \(.*\) - Mods.*!\1!p' | recode html..ascii)

        if [ "$REQ" = "null" ] || [ $REQ = "true" ]; then
            modlist+=( "$i" "$TITLE" "on" )
        else
            modlist+=( "$i" "$TITLE" "off" )
        fi
        modnames+=( "$TITLE" )
done

dialog --backtitle "$BACKTITLE" --title "Welcome!" --checklist "\
\nThese are all mods that have to be downloaded to make this modpack \
working for you. To select or deselect single mods use your up and down \
keys and press space. All mods with an asterisk in front will be downloaded. \
Optional mods are not selected by default. Mostly they are more useful for \
server owners or have only decorative purposes. Refer to the modpack description \
or authors for more information.\n\n" 30 70 20 "${modlist[@]}" 2>$OUTPUT

if [ "$(cat $OUTPUT)" = "" ]; then
    shutdown
fi

for n in $(cat $OUTPUT)
do
    PID=$(cat $FILE | jq '.files['$n-1'].projectID')
    FID=$(cat $FILE | jq '.files['$n-1'].fileID')
    TITLE=${modnames[$n]}

    PROJECTURL=$(curl -Ls -o /dev/null -w %{url_effective} https://minecraft.curseforge.com/mc-mods/$PID)
    URL=$PROJECTURL'/files/'$FID'/download'
    VERIFY=$PROJECTURL'/files/'$FID

    wget -P $TMP/modpack/overrides/mods/ --trust-server-names "$URL" 2>&1 | \
    stdbuf -o0 awk '/[.] +[0-9][0-9]?[0-9]?%/ { print substr($0,63,3) }' | \
    dialog --backtitle "$BACKTITLE" --title "Downloading Mods" --gauge "\nDownloading \"$TITLE\"" 10 100

    # TODO MD5 verification
done

# Copy all the files into MultiMC
cp -r $TMP/modpack/overrides/* "$MMCDIR/instances/$MP ($VER)/minecraft/" > /dev/null 2>&1

dialog --backtitle "$BACKTITLE" --title "Welcome!" --msgbox "\
\nEverything should be ready for you now. After you click \"OK\" MultiMC \
will launch. Double click the entry for your modpack and MultiMC will \
provide all the missing files you need and start your game. If this is \
the first time using MultiMC you will also have to add your userdata the \
launcher.\n\n\
To start MultiMC in the future call \"~/.MultiMC/MultiMC\" from the console \
or add a shortcut in your start menu. You don't need this program anymore!\
\n\nHave fun with your modpack and thank you for using this installer. \
If you have any suggestions or improvements tell me about it or contribute \
in the package! https://github.com/EfficiencyVI/adcmmp or efficiencyvi6@gmail.com" 30 70

bash $MMCBIN &
shutdown