.envrc

# shellcheck shell=bash
set -euo pipefail

if ! has nix_direnv_version || ! nix_direnv_version 3.1.1; then
  source_url https://raw.githubusercontent.com/nix-community/nix-direnv/3.1.1/direnvrc sha256-p+fzQdrms/hDa7g+soShAybJNo4bN4SIAeSfqNKgD5I=
fi
# `use flake` only invalidates the cached dev shell when flake.nix or
# flake.lock change — not the .nix files they import. Watch those too,
# so edits to the devShell package list (e.g. adding x264) or the
# toolchain rebuild the shell instead of serving a stale cache.
# Must run BEFORE `use flake`: nix-direnv snapshots the watch list into
# its cache manifest when `use flake` executes; files watched later only
# re-source .envrc while the stale dev shell keeps being served.
watch_file nix/packages.nix nix/common.nix nix/tasks.nix

# `nix print-dev-env` reports stdenv's bash as `SHELL`.  Interactive direnv
# hooks protect the caller's login shell from that value, but `direnv exec`
# does not.  Muster starts the development server with `direnv exec`, and the
# server in turn uses `SHELL` for every new terminal, so preserve the value
# with which direnv was invoked.
_blit_had_shell=${SHELL+x}
_blit_shell=${SHELL-}
use flake .
if [ "$_blit_had_shell" = x ]; then
  export SHELL="$_blit_shell"
else
  unset SHELL
fi
unset _blit_had_shell _blit_shell


# nix-direnv does not propagate LD_LIBRARY_PATH from the devShell
# (direnv filters it).  blit-server dlopen's GPU libraries at runtime:
#   VA-API:  libva.so, libva-drm.so
#   EGL:     libEGL.so, libGLESv2.so  (via GLVND dispatch)
#   GBM:     libgbm.so
#   NVIDIA:  libcuda.so, libnvidia-encode.so  (from /run/opengl-driver)
#   Mesa:    VA-API / EGL drivers             (from /run/opengl-driver)
#
# Re-export from LIBRARY_PATH (which nix-direnv does propagate from
# buildInputs) plus the NixOS driver runpath.
_gpu_ld=""
if [ -d /run/opengl-driver/lib ]; then
  _gpu_ld="/run/opengl-driver/lib"
fi
# LIBRARY_PATH has the Nix store paths for libva, libglvnd, libgbm etc.
# from the devShell's buildInputs.
if [ -n "${LIBRARY_PATH:-}" ]; then
  _gpu_ld="${_gpu_ld:+$_gpu_ld:}$LIBRARY_PATH"
fi
if [ -n "$_gpu_ld" ]; then
  export LD_LIBRARY_PATH="$_gpu_ld${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
fi
unset _gpu_ld

dotenv_if_exists .env.local