Phase 4 of plans/exit.md: the aux/terminal sub-entrypoints. pkg/auxents and
pkg/terminals are now os.Exit-free; even the dispatchers return exit codes
instead of exiting.
- auxents.Dispatch returns (handled bool, exitCode int); entrypoint.Main --
the one sanctioned exit point -- exits with the code.
- terminals.Dispatch returns an exit code; the climain caller wraps it in a
lib.ExitRequest, which also retires the 'terminal did not exit the process'
panic.
- Usage functions (hex, unhex, lecat, termcvt, repl, script, regtest) no
longer take an exitCode parameter and exit; call sites print usage and
return the code explicitly.
- Inner I/O helpers (hexDumpFile, unhexFile, lecatFile, termcvtFile) return
errors; each sub-main prints 'mlr {verb}: ...' as before and returns 1.
lecatFile formerly looped forever on a non-EOF read error; it now returns
the error.
- The regtest directory walk (Execute / executeSinglePath /
executeSingleDirectory / hasCaseSubdirectories) plumbs errors up to
RegTestMain; regression_test.go updated for the new Execute signature.
Stderr messages and exit codes are unchanged across mlr aux-list, hex, unhex,
lecat, termcvt, help, version, repl, script, and regtest surfaces (checked by
hand); all 4779 regression cases pass; make lint is clean; docs rebuild with
zero churn.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
