Re: [PATCH 1/2] help: introduce option --command-only

> Introduce option --command-only to the help command.  With this option
> being passed, "git help" will open man pages only for commands.
>
> Since we know it is a command, we can use function help_unknown_command
> to give the user advice on typos.
>
> Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>
> ---
> I am not sure about the first test case, but I think it'd have
> prevented me from making earlier mistakes of this change. That's
> why I added it.
> Just calling a git command that succeeds in a test isn't really
> a check, so ... I dunno

>
> Documentation/git-help.txt             | 11 ++++++++---
> builtin/help.c                         | 30 +++++++++++++++++++++++-------
> contrib/completion/git-completion.bash |  2 +-
> t/t0012-help.sh                        | 21 +++++++++++++++++++++
> 4 files changed, 53 insertions(+), 11 deletions(-)
> create mode 100755 t/t0012-help.sh
>
> diff --git a/Documentation/git-help.txt b/Documentation/git-help.txt
> index 40d328a..cf6a414 100644
> --- a/Documentation/git-help.txt
> +++ b/Documentation/git-help.txt
> @@ -8,7 +8,7 @@ git-help - Display help information about Git
> SYNOPSIS
> --------
> [verse]
> -'git help' [-a|--all] [-g|--guide]
> +'git help' [-a|--all] [-c|--command-only] [-g|--guide]
>     [-i|--info|-m|--man|-w|--web] [COMMAND|GUIDE]
>
> DESCRIPTION
> @@ -29,8 +29,9 @@ guide is brought up. The 'man' program is used by 
> default for this
> purpose, but this can be overridden by other options or configuration
> variables.
>
> -Note that `git --help ...` is identical to `git help ...` because the
> -former is internally converted into the latter.
> +Note that `git --help ...` is almost identical to `git help ...` because
> +the former is internally converted into the latter with 
> option --command-only
> +being added.
>
> To display the linkgit:git[1] man page, use `git help git`.
>
> @@ -43,6 +44,10 @@ OPTIONS
>  Prints all the available commands on the standard output. This
>  option overrides any given command or guide name.
>
> +-c::
> +--command-only::
> + Display help information only for commands.

> +
> -g::
> --guides::
>  Prints a list of useful guides on the standard output. This
> diff --git a/builtin/help.c b/builtin/help.c
> index 8848013..2249a67 100644
> --- a/builtin/help.c
> +++ b/builtin/help.c
> @@ -37,8 +37,10 @@ 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 cmd_only;
> static struct option builtin_help_options[] = {
>  OPT_BOOL('a', "all", &show_all, N_("print all available commands")),
> + OPT_BOOL('c', "command-only", &cmd_only, N_("show help only for 
> 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),
>  OPT_SET_INT('w', "web", &help_format, N_("show manual in web browser"),
> @@ -433,10 +435,29 @@ static void list_common_guides_help(void)
>  putchar('\n');
> }
>
> +static const char *check_git_cmd(const char* cmd)
> +{
> + char *alias;
> +
> + if (is_git_command(cmd))
> + return cmd;
> +
> + alias = alias_lookup(cmd);
> + if (alias) {
> + printf_ln(_("`git %s' is aliased to `%s'"), cmd, alias);
> + free(alias);
> + exit(0);
> + }
> +
> + if (cmd_only)
> + return help_unknown_cmd(cmd);
> +
> + return cmd;
> +}
> +
> int cmd_help(int argc, const char **argv, const char *prefix)
> {
>  int nongit;
> - char *alias;
>  enum help_format parsed_help_format;
>
>  argc = parse_options(argc, argv, prefix, builtin_help_options,
> @@ -476,12 +497,7 @@ int cmd_help(int argc, const char **argv, const char 
> *prefix)
>  if (help_format == HELP_FORMAT_NONE)
>  help_format = parse_help_format(DEFAULT_HELP_FORMAT);
>
> - alias = alias_lookup(argv[0]);
> - if (alias && !is_git_command(argv[0])) {
> - printf_ln(_("`git %s' is aliased to `%s'"), argv[0], alias);
> - free(alias);
> - return 0;
> - }
> + argv[0] = check_git_cmd(argv[0]);
>
>  switch (help_format) {
>  case HELP_FORMAT_NONE:
> diff --git a/contrib/completion/git-completion.bash 
> b/contrib/completion/git-completion.bash
> index c1b2135..354afe5 100644
> --- a/contrib/completion/git-completion.bash
> +++ b/contrib/completion/git-completion.bash
> @@ -1393,7 +1393,7 @@ _git_help ()
> {
>  case "$cur" in
>  --*)
> - __gitcomp "--all --guides --info --man --web"
> + __gitcomp "--all --command-only --guides --info --man --web"
>  return
>  ;;
>  esac
> diff --git a/t/t0012-help.sh b/t/t0012-help.sh
> new file mode 100755
> index 0000000..e20f907
> --- /dev/null
> +++ b/t/t0012-help.sh
> @@ -0,0 +1,21 @@
> +#!/bin/sh
> +
> +test_description='help'
> +
> +. ./test-lib.sh
> +
> +test_expect_success "works for commands and guides by default" "
> + git help status &&
> + git help revisions
> +"
> +
> +test_expect_success "--command-only does not work for guides" "
> + git help --command-only status &&
> + cat <<-EOF >expected &&
> + git: 'revisions' is not a git command. See 'git --help'.
> + EOF
> + (git help --command-only revisions 2>actual || true) &&
> + test_i18ncmp expected actual
> +"
> +
> +test_done
> -- 
> 2.9.2.912.gd0c0e83
>
>