Silent/Quiet option when opening a new terminal

[jgoux]

Hello 👋, very excited about this project!

Could we add an ENV variable or an option to suppress the Building shell ... and other progress reports when opening a new terminal? Ideally, I'd like to only see errors reported.

The related code seems here:

devenv/src/devenv.nix

Lines 59 to 65 in 1aa3dbb

	function shell {
	assemble
	echo "Building shell ..." 1>&2
	env=$($CUSTOM_NIX/bin/nix $NIX_FLAGS print-dev-env --impure --profile "$DEVENV_GC/shell")
	$CUSTOM_NIX/bin/nix-env -p "$DEVENV_GC/shell" --delete-generations old 2>/dev/null
	ln -sf $(${pkgs.coreutils}/bin/readlink -f "$DEVENV_GC/shell") "$GC_DIR-shell"
	}

[domenkozar]

Sounds good! I'd like to refactor the argument parsing by using docopts, so things like this will be possible.

[alicebob]

This would also be nice for github actions. My actions have multiple devenv shell statements, which don't need the devenv output:

    - name: Test formatting
      run: devenv shell test -z '$(go fmt ./...)'
    - name: Run tests
      run: devenv shell make citest

(-quiet or similar would work great for my use case)