8000 special help subcmd prints to stdout; small improvements for args/flag errors by zacharysyoung · Pull Request #84 · aotimme/gocsv · GitHub
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special help subcmd prints to stdout; small improvements for args/flag errors #84

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special help subcmd prints to stdout; small improvements for args/flag errors #84

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@zacharysyoung zacharysyoung commented May 7, 2025 •
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Addresses #83.

Print special help subcommand to to stdout for better readability/processing: since the user explicitly asks for help, make their life easier by printing to stdout.

bad/missing subcommand error, and subcommand -h usage still print to stderr.

Also, following the style of something like go test -h, which prints:

usage: go test [build/test flags] [packages] [build/test flags & test binary flags]
Run 'go help test' and 'go help testflag' for details.

A missing subcommand prints:

usage: gocsv help|version|<subcommand>
Run 'gocsv help' for a list of subcommands, and 'gocsv <subcommand> -h' for subcommand details.

and a bad subcommand (e.g., foo), prints:

error: invalid subcommand "foo"

usage: gocsv help|version|<subcommand>
Run 'gocsv help' for a list of subcommands, and 'gocsv <subcommand> -h' for subcommand details.

A bad/missing subcommand no longer prints the big usage list, which will likely obscure the error/problem.

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