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build(faust): auto re-exec under nix-shell when faust is missing

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If faust isn't in PATH but nix-shell is, transparently re-exec the
script via `nix-shell -p faust --run` instead of erroring out with a
hint. NISPS_BUILD_IN_NIX_SHELL guards against infinite recursion if the
shell somehow still lacks faust.
This commit is contained in:
monkey-w1n5t0n 2026-04-11 07:58:43 +02:00
parent 2993328859
commit 0de64463fd
1 changed files with 13 additions and 1 deletions
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14
playground/faust/build.sh
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@ -24,10 +24,22 @@ SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
# ---------------------------------------------------------------------------
# Dependency checks
# ---------------------------------------------------------------------------
#
# If faust isn't in PATH, automatically re-exec under `nix-shell -p faust`
# when nix-shell is available. NISPS_BUILD_IN_NIX_SHELL prevents infinite
# recursion if the nix-shell environment somehow still lacks faust.
if ! command -v faust &>/dev/null; then
if [ "${NISPS_BUILD_IN_NIX_SHELL:-0}" = "1" ]; then
echo "ERROR: 'faust' still not found inside nix-shell. Check your nixpkgs channel."
exit 1
fi
if command -v nix-shell &>/dev/null; then
echo "faust not in PATH — re-exec under nix-shell -p faust ..."
exec env NISPS_BUILD_IN_NIX_SHELL=1 nix-shell -p faust --run "\"$0\" $*"
fi
echo ""
echo "ERROR: 'faust' not found in PATH."
echo "ERROR: 'faust' not found in PATH (and nix-shell is unavailable)."
echo ""
echo "Install options:"
echo " nix-shell -p faust # one-off"