[PATCH v2 4/5] builtin/help: add --config-all-for-completion

["Philippe Blain via GitGitGadget" <gitgitgadget@gmail.com>]

From: Philippe Blain <levraiphilippeblain@gmail.com>

There is currently no machine-friendly way to show _all_ configuration
variables from the command line. 'git help --config' does show them all,
but it also sets up the pager. 'git help --config-for-completion' omits
some variables (those containing wildcards, for example) and 'git help
--config-section-for-completion' shows only top-level section names.

In a following commit we will want to have access to a list of all
configuration variables from the Bash completion script. As such, add a
new mode for the command, HELP_ACTION_CONFIG_ALL_FOR_COMPLETION,
triggered by the new option '--config-all-for-completion'. In this mode,
show all variables, just as HELP_ACTION_CONFIG, but do not set up the
pager.

Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
---
 builtin/help.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/builtin/help.c b/builtin/help.c
index dc1fbe2b986..dacaeb10bf4 100644
--- a/builtin/help.c
+++ b/builtin/help.c
@@ -50,6 +50,7 @@ static enum help_action {
 	HELP_ACTION_DEVELOPER_INTERFACES,
 	HELP_ACTION_CONFIG_FOR_COMPLETION,
 	HELP_ACTION_CONFIG_SECTIONS_FOR_COMPLETION,
+	HELP_ACTION_CONFIG_ALL_FOR_COMPLETION,
 } cmd_mode;
 
 static const char *html_path;
@@ -86,6 +87,8 @@ static struct option builtin_help_options[] = {
 		    HELP_ACTION_CONFIG_FOR_COMPLETION, PARSE_OPT_HIDDEN),
 	OPT_CMDMODE_F(0, "config-sections-for-completion", &cmd_mode, "",
 		    HELP_ACTION_CONFIG_SECTIONS_FOR_COMPLETION, PARSE_OPT_HIDDEN),
+	OPT_CMDMODE_F(0, "config-all-for-completion", &cmd_mode, "",
+		    HELP_ACTION_CONFIG_ALL_FOR_COMPLETION, PARSE_OPT_HIDDEN),
 
 	OPT_END(),
 };
@@ -670,6 +673,10 @@ int cmd_help(int argc, const char **argv, const char *prefix)
 		opt_mode_usage(argc, "--config-for-completion", help_format);
 		list_config_help(SHOW_CONFIG_VARS);
 		return 0;
+	case HELP_ACTION_CONFIG_ALL_FOR_COMPLETION:
+		opt_mode_usage(argc, "--config-all-for-completion", help_format);
+		list_config_help(SHOW_CONFIG_HUMAN);
+		return 0;
 	case HELP_ACTION_USER_INTERFACES:
 		opt_mode_usage(argc, "--user-interfaces", help_format);
 		list_user_interfaces_help();
-- 
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