shell.nix

{ pkgs ? import <nixpkgs> {} }:

let
  dir = toString ./.;

  rcfile = pkgs.writeText "lineageos-build-rc" ''
    [ -n "$PS1" ] && [ -e ~/.bashrc ] && source ~/.bashrc
    [ -n "$PS1" ] && PS1='\n\[\033[2;32m\]linageos-shell:\w>\[\033[0m\] ';

    export USE_CCACHE=1
    export CCACHE_EXEC=$(which ccache)

    # Specific to LineageOS...
    source "${dir}/build/envsetup.sh"
  '';

  script = pkgs.writeShellScript "env-setup" ''
    exec bash --rcfile "${rcfile}" "$@"
  '';

  env = pkgs.buildFHSUserEnv {
    name = "lineageos-build-fhs";
    targetPkgs = p: with p; [
    # Build utilities
    ccache

    # Build deps
    bc
    fontconfig
    freetype
    gitRepo
    gnum4
    openssl
    openssl.dev
    python2 # ewww...
    python3 # yes, too...
    zip

    ncurses5
    zlib

    # Some other utilities
    xxd
  ];

  runScript = script;
};
in
  pkgs.mkShell {
    name = "lineageos-build-shell";
    shellHook = ''
      exec ${env}/bin/lineageos-build-fhs
    '';
  }