git-help: add -i|--info option to display info page.

"git help --info subcommand" will now call "info git-subcommand".

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/help.c b/help.c
index 37a9c25db72d2a69a8076517870b7b874bd336a9..0f1cb7172bbafaad977ebd661e802c304e553c18 100644 (file)
--- a/help.c
+++ b/help.c
@@ -239,24 +239,32 @@ void list_common_cmds_help(void)
        }
 }
 
-static void show_man_page(const char *git_cmd)
+static const char *cmd_to_page(const char *git_cmd)
 {
-       const char *page;
-
        if (!prefixcmp(git_cmd, "git"))
-               page = git_cmd;
+               return git_cmd;
        else {
                int page_len = strlen(git_cmd) + 4;
                char *p = xmalloc(page_len + 1);
                strcpy(p, "git-");
                strcpy(p + 4, git_cmd);
                p[page_len] = 0;
-               page = p;
+               return p;
        }
+}
 
+static void show_man_page(const char *git_cmd)
+{
+       const char *page = cmd_to_page(git_cmd);
        execlp("man", "man", page, NULL);
 }
 
+static void show_info_page(const char *git_cmd)
+{
+       const char *page = cmd_to_page(git_cmd);
+       execlp("info", "info", page, NULL);
+}
+
 void help_unknown_cmd(const char *cmd)
 {
        fprintf(stderr, "git: '%s' is not a git-command. See 'git --help'.\n", cmd);
@@ -269,10 +277,8 @@ int cmd_version(int argc, const char **argv, const char *prefix)
        return 0;
 }
 
-int cmd_help(int argc, const char **argv, const char *prefix)
+static void check_help_cmd(const char *help_cmd)
 {
-       const char *help_cmd = argc > 1 ? argv[1] : NULL;
-
        if (!help_cmd) {
                printf("usage: %s\n\n", git_usage_string);
                list_common_cmds_help();
@@ -284,6 +290,19 @@ int cmd_help(int argc, const char **argv, const char *prefix)
                list_commands();
                exit(0);
        }
+}
+
+int cmd_help(int argc, const char **argv, const char *prefix)
+{
+       const char *help_cmd = argc > 1 ? argv[1] : NULL;
+       check_help_cmd(help_cmd);
+
+       if (!strcmp(help_cmd, "--info") || !strcmp(help_cmd, "-i")) {
+               help_cmd = argc > 2 ? argv[2] : NULL;
+               check_help_cmd(help_cmd);
+
+               show_info_page(help_cmd);
+       }
 
        else
                show_man_page(help_cmd);