Introduce option --exclude-guides to the help command.  With this option
being passed, "git help" will open man pages only for actual commands.

Since we know it is a command, we can use function help_unknown_command
to give the user advice on typos.

Helped-by: Johannes Schindelin <johannes.schinde...@gmx.de>
Signed-off-by: Ralf Thielow <ralf.thie...@gmail.com>
---
In the test script we do two things I'd like to point out:

> +       test_config help.htmlpath test://html &&

As we pass a URL, Git won't check if the given path looks like
a documentation directory.  Another solution would be to create
a directory, add a file "git.html" to it and just use this path.

> +       test_config help.browser firefox

Git checks if the browser is known, so the "test-browser" needs to
pretend it is one of them.

 Documentation/git-help.txt             |  6 +++++-
 builtin/help.c                         | 30 +++++++++++++++++++++++-------
 contrib/completion/git-completion.bash |  2 +-
 t/t0012-help.sh                        | 33 +++++++++++++++++++++++++++++++++
 4 files changed, 62 insertions(+), 9 deletions(-)
 create mode 100755 t/t0012-help.sh

diff --git a/Documentation/git-help.txt b/Documentation/git-help.txt
index 40d328a..eeb1950 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] [-e|--exclude-guides] [-g|--guide]
           [-i|--info|-m|--man|-w|--web] [COMMAND|GUIDE]
 
 DESCRIPTION
@@ -43,6 +43,10 @@ OPTIONS
        Prints all the available commands on the standard output. This
        option overrides any given command or guide name.
 
+-e::
+--exclude-guides::
+       Do not show help for guides.
+
 -g::
 --guides::
        Prints a list of useful guides on the standard output. This
diff --git a/builtin/help.c b/builtin/help.c
index e8f79d7..40901a9 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 exclude_guides;
 static struct option builtin_help_options[] = {
        OPT_BOOL('a', "all", &show_all, N_("print all available commands")),
+       OPT_BOOL('e', "exclude-guides", &exclude_guides, N_("exclude guides")),
        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"),
@@ -426,10 +428,29 @@ 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 (exclude_guides)
+               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,
@@ -469,12 +490,7 @@ 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..b148164 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 --exclude-guides --guides --info --man --web"
                return
                ;;
        esac
diff --git a/t/t0012-help.sh b/t/t0012-help.sh
new file mode 100755
index 0000000..fb1abd7
--- /dev/null
+++ b/t/t0012-help.sh
@@ -0,0 +1,33 @@
+#!/bin/sh
+
+test_description='help'
+
+. ./test-lib.sh
+
+configure_help () {
+       test_config help.format html &&
+       test_config help.htmlpath test://html &&
+       test_config help.browser firefox 
+}
+
+test_expect_success "setup" "
+       write_script firefox <<-\EOF
+       exit 0
+       EOF
+"
+
+test_expect_success "works for commands and guides by default" "
+       configure_help &&
+       git help status &&
+       git help revisions
+"
+
+test_expect_success "--exclude-guides does not work for guides" "
+       cat <<-EOF >expected &&
+               git: 'revisions' is not a git command. See 'git --help'.
+       EOF
+       test_must_fail git help --exclude-guides revisions 2>actual &&
+       test_i18ncmp expected actual
+"
+
+test_done
-- 
2.9.2.912.gd0c0e83

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