update-unciv.sh

#!/usr/bin/bash
# update-unciv.sh
# update ./unciv/PKGBUILD to the given version
# License: WTFPL v2 "You just DO WHAT THE FUCK YOU WANT TO."

echo "Flags: ($*)"
# Check that everything's okay to run this
if ! cd "$(dirname "$(readlink -f "$0")")/unciv"; then
    echo "Could not 'cd' to package's directory."
    exit 1
fi
echo "cd'd to '$PWD'"
PKGREL=1
PATCH=
if [ "$#" = "2" ]; then
    PATCH="$2"
    ((PKGREL+=PATCH))
    set "$1"
    echo "PATCH=$PATCH"
fi
if [ "$#" != "1" ]; then
    echo "$0 newversion [patch]"
    echo "Updates the PKGBUILD to the new version, removes old downloads, and builds."
    echo "With '-' as the new version, rebuild for the old version."
    exit 1
fi
echo "enough args"
NEW="$1"
echo "NEW=$NEW"
NEW_FULL="$NEW${PATCH:+-patch$PATCH}"
echo "NEW_FULL=$NEW_FULL"
echo "PKGREL=$PKGREL"
OLD="$(grep -E "pkgver=[0-9.]+" PKGBUILD | cut -c8-)"
echo "OLD=$OLD"
OLD_PATCH="$(grep -E "_patch=[0-9.]*" PKGBUILD | cut -c8-)"
OLD_FULL="$OLD${OLD_PATCH:+-patch$OLD_PATCH}"
echo "OLD_FULL=$OLD_FULL"
if [ "$OLD_FULL" = "$NEW_FULL" ]; then
    echo "Already at version $OLD. Use '-' to keep the same version."
    exit 1
fi
echo "tested OLD vs NEW"
if [ "$NEW_FULL" = "-" ]; then
    NEW_FULL="$OLD_FULL"
    NEW="$OLD"
    NEW_PATCH="$OLD_PATCH"
fi

# Save source old files, and recover new ones if previously saved.
echo "Shuffling current files as applicable..."
FILES=(Unciv.jar
       Unciv%20icon%20v3%20for%20google%20play.png
       linuxFilesForJar.zip)
mkdir -p old
for f in "${FILES[@]}"; do
    if [ -e "$f" ]; then
        mv "$f" "old/$f.$OLD_FULL"
        echo "Moved '$f' to 'old/$f.$OLD_FULL'"
    fi
    if [ -e "old/$f.$NEW_FULL" ]; then
        echo "Using file at 'old/$f.$NEW_FULL'."
        mv "old/$f.$NEW_FULL" "$f"
    else
        echo "No file at 'old/$f.$NEW_FULL'."
    fi
done

# Remove previously generated source and package files
rm ./*.src.tar.gz ./*.pkg.tar

# Switch PKGBUILD to new version
echo "Updating version in PKGBUILD..."
sed -r "s/^pkgver=$OLD$/pkgver=$NEW/g" -i ./PKGBUILD
sed -r "s/[0-9a-f]{64,}/SKIP/g" -i ./PKGBUILD
if [ -n "$PATCH" ]; then
    echo "Setting patch version $PATCH."
    sed -r "s/^#?_patch=[0-9]*/_patch=$PATCH/g" -i ./PKGBUILD
else
    echo "Setting nil patch version."
    sed -r "s/^#?_patch=[0-9]*/#_patch=/g" -i ./PKGBUILD
fi
sed -r "s/^pkgrel=[0-9.]+$/pkgrel=$PKGREL/g" -i ./PKGBUILD

# Download and update checksums for new version
echo "Getting sources..."
makepkg --nobuild
echo "Updating checksums..."
makepkg --geninteg | grep -Eo '[0-9a-f]{64,}' |
    while read -r; do
        # Per https://stackoverflow.com/a/33416489, this GNU sed
        # command matches the find pattern ('SKIP') from line 0 or
        # later, uses it in an "s/find/replace/" expression (while
        # reusing the find pattern with "//"), and replaces it with
        # the replace pattern ('$REPLY').
        sed -r "0,/'SKIP'/ s//'$REPLY'/" -i ./PKGBUILD
    done

# Make source tarball to upload to the CCR and local package file to install
echo "Making source tarball"
makepkg --source
echo "Making package file"
makepkg

# Clean up packaging directories
rm -r ./pkg ./src

echo "Done! ^.^"