DWAA1660andClaude Opus 5.5 a6cedcc9e8 Issue #168: the desktop app and CLI log warnings to stderr; RUST_LOG works ...

lightcraft-cli installed no `log` backend, so every log::warn!/info! record
(the GPU-to-CPU fallback, an unknown LIGHTCRAFT_GPU_BACKEND, the adapter
chosen) was dropped and RUST_LOG, which docs/gpu-pipeline.md documents for
the fallback warning, did nothing. The desktop app had its own logger that
read only LIGHTCRAFT_LOG.

Both now install lightcraft_engine::logging: warnings and errors on stderr
by default; LIGHTCRAFT_LOG or RUST_LOG (off, error, warn, info, debug,
trace) picks another level, LIGHTCRAFT_LOG winning, and RUST_LOG's
per-target directives (`lightcraft=debug,wgpu=warn`) set LightCraft's
level. Below warnings only LightCraft's own records are shown, as the app's
logger did. The app's --help lists the variable.

Tests: level parsing and target filtering (engine logging::tests); the CLI
prints "LIGHTCRAFT_GPU_BACKEND=bogus names no known backend" with
RUST_LOG=warn and nothing with RUST_LOG=off (cli.rs).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K3vVft4VXvvy8SpbbUceTW

2026-10-08 17:14:04 +00:00

..

cli.rs

Issue #168: the desktop app and CLI log warnings to stderr; RUST_LOG works

2026-10-08 17:14:04 +00:00