local_install.sh

#!/bin/bash

# Exit if there are no arguments
if [ $# -eq 0 ]; then
    echo "Usage: $0 <package-name|args>"
    exit 1
fi

package_names=()

# Cycle through args
for arg in "$@"; do
    if [ "$arg" = "--help" ]; then
        echo "General usage: $0 <package-name|args>"
        exit 0
    elif [ "$arg" = "--setup" ]; then
        # Create all needed dirs if they dont exist
        mkdir -p "$HOME/.local/lib/"
        mkdir -p "$HOME/.local/lib64/"
        mkdir -p "$HOME/.local/lib/x86_64-linux-gnu/"

        echo "Created library directories..."

        # Add the library path to .profile
        # if --setup is specified
        lib_paths="$(printf '%s' \
            "export LD_LIBRARY_PATH=" \
            "$HOME/.local/lib:" \
            "$HOME/.local/lib64:" \
            "$HOME/.local/lib/x86_64-linux-gnu")"

        # Append to $HOME/.profile
        # if it isn't already there
        if ! grep -q "$lib_paths" \
                "$HOME/.profile"; then
            echo "Adding library paths..."
            echo "$lib_paths" >> "$HOME/.profile"
            eval "$lib_paths"
            echo "Please reboot your computer or"\
                 "login again to complete the setup"
        else
            echo "Library paths already"\
                 "present, ignoring..."
        fi

        echo "Done."
        exit 0
    else
        package_names+=("$arg")
    fi
done

# Make a temp dir and cd there
temp_dir="$HOME/.temp/"

mkdir -p "$temp_dir"
cd "$temp_dir" || { echo "Cannot CD into $temp_dir, exiting..." && rm -r "$temp_dir" && exit 1; }

# Exit if there's no internet connection
if ! ping -c 1 -W 1 "deb.debian.org" > /dev/null 2>&1; then
    echo "You need an active internet connection"
    rm -r "$temp_dir"
    exit 1
fi

# Download package and all dependencies
for package_name in "${package_names[@]}"; do
    apt download "$package_name" || { echo "Error while trying to install package, exiting..." && rm -r "$temp_dir" && exit 1; }

    echo "Collecting dependencies..."
    dependencies=$(apt-cache depends --recurse -i "$package_name" | grep "Depends:" | awk '{print $2}' | sort -u)

    for dependency in $dependencies; do
        # TODO: Ignore virtual packages using
        # apt download .. || { apt show | grep ..; }
        apt download "$dependency"
    done
done

# Install all of them in .temp/install/
for deb_file in "$temp_dir"*.deb; do
    echo "Installing ${deb_file##*/}..."
    dpkg -x "$deb_file" "install/"
done

# Cd into .temp/install/ and copy all files
# to their corresponding directories
echo "Moving files..."

inst_dir="$temp_dir/install"
local_dir="$HOME/.local/"
mkdir -p "$local_dir"

find "$inst_dir" -mindepth 1 -maxdepth 1 ! -name 'usr' -exec cp -rn {} "$local_dir" \;

if [ -d "$inst_dir/usr/" ]; then
    find "$inst_dir/usr/" -mindepth 1 -maxdepth 1 ! -name 'local' -exec cp -rn {} "$local_dir" \;
fi

if [ -d "$inst_dir/usr/local/" ]; then
    cp -rn "$inst_dir/usr/local/"* "$local_dir"
fi

# Echo "Done." when the
# installation is done
# and remove the temp dir
echo "Done."

rm -r "$temp_dir"