Re: [PATCH v3] help: make option --help open man pages only for Git commands

[John Keeping <john@keeping.me.uk>]

On Tue, Aug 16, 2016 at 06:20:30PM +0200, Ralf Thielow wrote:
> If option --help is passed to a Git command, we try to open
> the man page of that command.  However, we do it even for commands
> we don't know.  Make sure it is a Git command by using "help_unknown_cmd"
> which is even able to assume a command if the user made a typo.
> 
> This breaks "git <concept> --help" while "git help <concept>" still works.
> 
> As "<cmd> --help" will internally be turned into "help <cmd>",
> introduce the hidden option "--swapped" in order to know which
> version has been called.
> 
> Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>
> ---
> Thanks, all, for the help!
> 
> Changes since v2:
> - don't check for common guides as the list is very incomplete
> - only check for git commands when called via <cmd> --help (introduce
>   option --swapped for that), as suggested by Junio
> - change test case to check for --help being passed to a concept
>   used as a git command
> 
>  builtin/help.c  | 30 +++++++++++++++++++++++-------
>  git.c           | 15 ++++++++++++++-
>  t/t0012-help.sh | 15 +++++++++++++++
>  3 files changed, 52 insertions(+), 8 deletions(-)
>  create mode 100755 t/t0012-help.sh
> 
> diff --git a/builtin/help.c b/builtin/help.c
> index 8848013..76f07c7 100644
> --- a/builtin/help.c
> +++ b/builtin/help.c
> @@ -37,7 +37,9 @@ static int show_all = 0;
>  static int show_guides = 0;
>  static unsigned int colopts;
>  static enum help_format help_format = HELP_FORMAT_NONE;
> +static int swapped = 0;
>  static struct option builtin_help_options[] = {
> +	OPT_BOOL('s', "swapped", &swapped, "mark as being called by <cmd> --help"),

OPT_HIDDEN_BOOL maybe?

>  	OPT_BOOL('a', "all", &show_all, N_("print all available commands")),
>  	OPT_BOOL('g', "guides", &show_guides, N_("print list of useful guides")),
>  	OPT_SET_INT('m', "man", &help_format, N_("show man page"), HELP_FORMAT_MAN),