Detector::Haskell::Cli
Detects Haskell command-line apps via optparse-applicative, cmdargs, System.Console.GetOpt, System.Environment.getArgs, or turtle's Turtle.Options. Never gates on bare getEnv/lookupEnv (Scotty/Servant config).
Constants
Turtle re-exports Turtle.Options from the top-level Turtle module,
which is used pervasively for plain shell scripting too, so gate on
either the qualified submodule import or an explicit options name
in the unqualified import list, never a bare import Turtle.
Class methods
The tech name without needing an instance, so the registry can be read off the classes themselves rather than from a parallel list.
Instance methods
Cheap filename-only filter the detector pass uses to skip
detect on files the detector cannot possibly match. The
default true preserves prior behavior (every detector runs on
every file). Override with the same predicate the body of
detect starts with — e.g., filename.ends_with?(".py") for a
Python framework detector — so the detector loop avoids the
detect dispatch on files outside the detector's language.
On large codebases (saleor's 4255 .py files) this lifts ~100
virtual detect calls per file out of the hot loop because
most detectors' inner first-line is exactly this kind of cheap
filename check.