git --help COMMAND brings up the git-COMMAND man-page.

It's by design a bit stupid (matching ^git rather than ^git-), so as
to work with 'gitk' and 'git' as well.

Signed-off-by: Andreas Ericsson <ae@op5.se>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Documentation/git.txt b/Documentation/git.txt
index 15ae4f1..338e5ac 100644 (file)
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -24,6 +24,8 @@ OPTIONS
 
 --help::
        prints the synopsis and a list of available commands.
+       If a git command is named this option will bring up the
+       man-page for that command.
 
 --exec-path::
        path to wherever your core git programs are installed.

diff --git a/git.c b/git.c
index d189801..583923d 100644 (file)
--- a/git.c
+++ b/git.c
@@ -160,6 +160,26 @@ static void prepend_to_path(const char *dir, int len)
        setenv("PATH", path, 1);
 }
 
+/* has anyone seen 'man' installed anywhere else than in /usr/bin? */
+#define PATH_TO_MAN "/usr/bin/man"
+static void show_man_page(char *git_cmd)
+{
+       char *page;
+
+       if (!strncmp(git_cmd, "git", 3))
+               page = git_cmd;
+       else {
+               int page_len = strlen(git_cmd) + 4;
+
+               page = malloc(page_len + 1);
+               strcpy(page, "git-");
+               strcpy(page + 4, git_cmd);
+               page[page_len] = 0;
+       }
+
+       execlp(PATH_TO_MAN, "man", page, NULL);
+}
+
 int main(int argc, char **argv, char **envp)
 {
        char git_command[PATH_MAX + 1];
@@ -199,8 +219,12 @@ int main(int argc, char **argv, char **envp)
                        usage(NULL, NULL);
        }
 
-       if (i >= argc || show_help)
-               usage(exec_path, NULL);
+       if (i >= argc || show_help) {
+               if (i >= argc)
+                       usage(exec_path, NULL);
+
+               show_man_page(argv[i]);
+       }
 
        /* allow relative paths, but run with exact */
        if (chdir(exec_path)) {