linux-kernel - Re: [RFC PATCH 2/4] perf-probe: Add offline output directory option

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Date:   Thu, 25 Aug 2016 11:40:33 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [RFC PATCH 2/4] perf-probe: Add offline output directory option

Em Thu, Aug 25, 2016 at 07:48:16PM +0900, Masami Hiramatsu escreveu:
> On Wed, 24 Aug 2016 09:58:45 -0300
> Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> 
> > 
> > Also please fix the OPT_STRING string, it should start with a capital
> > letter:
> > 
> >         --max-probes <n>  Set how many probe points can be found for a probe.
> >         --no-inlines      Don't search inlined functions
> >         --outdir <directory>
> >                           path to offline output directory
> >         --range           Show variables location range in scope (with --vars only)
> > 
> > 
> > See how it stands out? All the others start with a capital letter.
> 
> BTW, actually in most case, perf shows option explanations start without a captal letter,
> 
> ./perf lock
> 
>  Usage: perf lock [<options>] {record|report|script|info}
> 
>     -D, --dump-raw-trace  dump raw trace in ASCII
>     -i, --input <file>    input file name
>     -v, --verbose         be more verbose (show symbol address, etc)
> 
> etc. Some commands (including probe) mixing it...

Right, inconsistent, so I went to see how other utilities do this, and,
say, something really old:

[acme@...et linux]$ cp --help | grep -- "[      ]\+-[a-z]"
  or:  cp [OPTION]... -t DIRECTORY SOURCE...
  -a, --archive                same as -dR --preserve=all
  -b                           like --backup but does not accept an argument
  -d                           same as --no-dereference --preserve=links
  -f, --force                  if an existing destination file cannot be
                                 is ignored when the -n option is also used)
  -i, --interactive            prompt before overwrite (overrides a previous -n
  -l, --link                   hard link files instead of copying
  -n, --no-clobber             do not overwrite an existing file (overrides
                                 a previous -i option)
  -p                           same as --preserve=mode,ownership,timestamps
  -c                           deprecated, same as --preserve=context
  -R, -r, --recursive          copy directories recursively
  -s, --symbolic-link          make symbolic links instead of copying
  -t, --target-directory=DIRECTORY  copy all SOURCE arguments into DIRECTORY
  -u, --update                 copy only when the SOURCE file is newer
  -v, --verbose                explain what is being done
  -x, --one-file-system        stay on this file system
[acme@...et linux]$ 

And then something more recent, and one perf initially was modelled after:

[acme@...et linux]$ git commit -h |& grep -- "[         ]\+-[a-z]" | tail -15
    -q, --quiet           suppress summary after successful commit
    -v, --verbose         show diff in commit message template
    -m, --message <message>
    -c, --reedit-message <commit>
    -s, --signoff         add Signed-off-by:
    -t, --template <file>
    -e, --edit            force edit of commit
    -a, --all             commit all changed files
    -i, --include         add specified files to index for commit
    -p, --patch           interactively add changes
    -o, --only            commit only specified files
    -n, --no-verify       bypass pre-commit hook
    -z, --null            terminate entries with NUL
    -u, --untracked-files[=<mode>]
[acme@...et linux]$ 

So, yeah, use lowercase and over time we can go on making it consistent...

- Arnaldo