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#!/usr/bin/env bash
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# Fail early
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set -euo pipefail
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PACKAGE="${1:?Usage: $0 <package>}"
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LOCAL_PREFIX="$HOME/local"
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PACKAGE_DIR="$LOCAL_PREFIX/$PACKAGE"
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BASHRC="$HOME/.bashrc"
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# Create a local dir to store the downloaded `.deb` files.
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mkdir -p "$PACKAGE_DIR"
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cd "$PACKAGE_DIR"
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# Download the packages and all of its dependencies
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python3 - "$PACKAGE" <<'PY'
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import subprocess
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import sys
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import re
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package = sys.argv[1]
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output = subprocess.check_output(
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    ["apt-cache", "depends", package],
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    text=True
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)
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packages = {package}
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for line in output.splitlines():
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    match = re.match(r"\s+Depends:\s+(\S+)", line)
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    if match:
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        packages.add(match.group(1))
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packages = sorted(packages)
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print("Packages: ")
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for package in packages:
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    print(f"   {package}")
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subprocess.run(["apt-get", "download", *packages], check=True)
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PY
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# Extract all downloaded .deb packages
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for deb in ./*.deb; do
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    dpkg-deb -x "$deb" "$PACKAGE_DIR"
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done
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# --------------------------------------------
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#     Add packages paths to ~/.bashrc
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# --------------------------------------------
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MARKER="# >>> local package: $PACKAGE >>>"
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if ! grep -Fq "$MARKER" "$BASHRC"; then
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    cat >> "$BASHRC" << EOF
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$MARKER
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export PATH="\$HOME/local/$PACKAGE/usr/bin:\$HOME/local/$PACKAGE/usr/sbin:\$PATH"
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export LD_LIBRARY_PATH="\$HOME/local/$PACKAGE/usr/lib/x86_64-linux-gnu:\$HOME/local/$PACKAGE/lib/x86_64-linux-gnu:\$HOME/local/$PACKAGE/usr/lib:\$HOME/local/$PACKAGE/lib:\$LD_LIBRARY_PATH"
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# <<< local package: $PACKAGE <<<
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EOF
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    echo
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    echo "Added $PACKAGE to ~/.bashrc"
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else
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    echo "$PACKAGE is already configured in ~/.bashrc"
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fi
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echo
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echo "Installed: $PACKAGE"
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echo "Location: $PACKAGE_DIR"
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echo
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echo "Open a new shell or run:"
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echo
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echo "    source ~/.bashrc"
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echo