genscript.sh

#!/bin/bash

# This script generates useable resourcepacks for every respack-compatible minecraft version in .zip format.
# Output located in ./generated

# Pack formats to generate.
FORMATS=(34 32 22 18 15 13 12 9 8 7 6 5 4 3 2 1 0)

# Minecraft version ranges for each pack format. Used for pack zip naming.
MCVER=(1.6.1-1.7.10 1.8-1.8.9 1.9–1.10.2 1.11–1.12.2 1.13–1.14.4 1.15–1.16.1 1.16.2–1.16.5 1.17–1.17.1 1.18–1.18.2 1.19–1.19.2 0 0 1.19.3 1.19.4 0 1.20–1.20.1 0 0 1.20.2 0 0 0 1.20.3-1.20.4 0 0 0 0 0 0 0 0 0 1.20.5 0 1.21)

# DPI range for GUI sizes.
DPI=(0 24 48 72 96 120 144 168 192)

# GUI Scales to generate.
SCALES=(2 3 4 5 6 7 8)

# Exit if running under root.
[ "${EUID}" = 0 ] && {

    echo
    echo ":: Please run without root privileges."
    echo
    exit 1
}

# Exit if running in wrong directory.
[ -e "./dev/script_enabler" ] || {

    echo
    echo ":: Please run inside source folder."
    echo
    exit 1
}

# Check deps.
MISSING=0
hash inkscape 2>/dev/null || {

    echo "Inkscape is not installed."
    MISSING=$((${MISSING}+1))
}
hash 7z 2>/dev/null || {

    echo "7z (7-Zip, p7zip) is not installed."
    MISSING=$((${MISSING}+1))
}
hash mogrify 2>/dev/null || {

    echo "imagemagick is not installed."
    MISSING=$((${MISSING}+1))
}
hash optipng 2>/dev/null || {

    echo "optipng is not installed."
    MISSING=$((${MISSING}+1))
}

# Exit if dependencies aren't met.
[ "${MISSING}" -gt "0" ] && {

    echo
    echo ":: ${MISSING} dependencies are missing. Exiting."
    echo
    exit 1
}

# Check if ./temp directory exists.
if [ -d ./temp ]; then

    INPUT=0
    while [ "$INPUT" != "y" ]; do

        echo
        echo ":: ./temp directory already exists (script error?). Remove? [y/n]"
        read -s -n 1 INPUT
        [ "${INPUT}" = "n" ] && exit 1
        [ "${INPUT}" = "y" ] && \rm -r ./temp
    done
fi

# Check if generated packs already exist.
if [ -d ./generated ]; then

    INPUT=0
    while [ "${INPUT}" != "y" ]; do

        echo
        echo ":: Generated packs already exist. Regenerate? [y/n]"
        read -s -n 1 INPUT
        [ "${INPUT}" = "n" ] && exit 1
        [ "${INPUT}" = "y" ] && \rm -r ./generated
    done
fi

# Get pack version to use
while [ "$PACKVER" = "" ]; do

    echo
    read -p ":: Enter the pack version (eg: 'v2.x' or 'Dev'): " PACKVER
done

echo ":: Starting generation (this may take a while!)"

shopt -s globstar   # Enable globstar during script.

mkdir ./temp
for SCALE in ${SCALES[@]}; do   # Loop through provided GUI scales.

    echo "Generating images for scale ${SCALE}..."
    rsync -a --exclude="*.svg" ./src/ ./temp/${SCALE}   # Copy all files EXCEPT SVGs to current ./temp/scale directory.
    for SVG in ./src/**/*.svg; do   # Loop through SVGs present in source directory.

        PNG=$(sed "s~src/~temp/$SCALE/~" <<< ${SVG} | sed -e "s~.svg~.png~")    # Set output filepath corresponding to input SVG.
        echo "file-open:${SVG}; export-filename:${PNG}; export-dpi:${DPI[$SCALE]}; export-do" >> ./temp/${SCALE}/inkscape.txt   # Add file to be processed in an inkscape script.
    done
    echo "quit" >> ./temp/${SCALE}/inkscape.txt # Add quit command to end of inkscape script.
    inkscape --shell < ./temp/${SCALE}/inkscape.txt &>/dev/null # Enter inkscape shell and run previously created script.
done

# Remove almost fully transparent pixels that don't play nice with Minecraft's texture rendering.
for SCALE in ${SCALES[@]}; do

    echo "Removing redundant pixels for scale ${SCALE}..."
    for PNG in ./temp/${SCALE}/**/*.png; do

        mogrify -fuzz 7% -channel RGBA -fill "#ffffff" -transparent "#88888800" ${PNG}
    done
done

# Compress generated PNG files.
for SCALE in ${SCALES[@]}; do

    echo "Optimizing images for scale ${SCALE}..."
    for PNG in ./temp/${SCALE}/**/*.png; do

        optipng -q ${PNG}
    done
done

# Sort and compress files.
mkdir ./generated
for SCALE in ${SCALES[@]}; do

    echo "Sorting files and creating zipped packs for scale ${SCALE}..."
    sed -i "s~SCALE~${SCALE}~" ./temp/${SCALE}/pack.mcmeta  # Change scale to currently looped number in pack description.
    for FORMAT in ${FORMATS[@]}; do

        [ ${SCALE} = 2 ] && mkdir ./generated/${FORMAT} # Create output folder for format if on first main loop pass.
        sed -i "s/FORMAT/${FORMAT}/g" ./temp/${SCALE}/pack.mcmeta   # Edit pack.mcmeta with current format.
        if [ -e ./temp/${SCALE}/${FORMAT}.exclude ]; then   # Check if exclusion list exists.

            for LINE in $(cat ./temp/${SCALE}/${FORMAT}.exclude); do    # Loop through lines in exclusion list.

                \rm -r ./temp/${SCALE}/assets/${LINE}   # Remove file from list.
            done
        fi
        if [ -d ./temp/${SCALE}/${FORMAT} ]; then   # Check if inclusion directory exists.

            \cp -r ./temp/${SCALE}/${FORMAT}/* ./temp/${SCALE}/assets   # Copy directory into assets
            [ "${FORMAT}" = 0 ] && sed -i "s~: 0~: 1~" ./temp/${SCALE}/pack.mcmeta # Change format number in pack.mcmeta from 0 to 1. "Format 0" packs are created due to a mechanic change with enchanting tables in 1.7 without a format change.
        fi
        7z a "./generated/${FORMAT}/Dracula ${PACKVER} GUI Scale ${SCALE} MC ${MCVER[$FORMAT]}.zip" ./temp/${SCALE}/assets ./temp/${SCALE}/LICENSE.md ./temp/${SCALE}/pack.mcmeta ./temp/${SCALE}/pack.png &>/dev/null  # Create zipped pack.
        sed -i "s~: ${FORMAT}~: FORMAT~" ./temp/${SCALE}/pack.mcmeta # Change format number back to search key in pack.mcmeta.
    done
done

# Clean up and send finished message.
\rm -r ./temp
echo
echo ":: Done. Output available in ./generated"
echo