git-svn: add --prefix= option to multi-init

Also, document --{trunk,branches,tags} options while we're
documenting multi-init options.

Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

Documentation/git-svn.txt

@@ -139,6 +139,24 @@ manually joining branches on commit.
 	where the repository URL ends and where the repository path
 	begins.
 
+-T<trunk_subdir>::
+--trunk=<trunk_subdir>::
+-t<tags_subdir>::
+--tags=<tags_subdir>::
+-b<branches_subdir>::
+--branches=<branches_subdir>::
+	These are the command-line options for multi-init.  Each of
+	these flags can point to a relative repository path
+	(--tags=project/tags') or a full url
+	(--tags=https://foo.org/project/tags)
+
+--prefix=<prefix>
+	This allows one to specify a prefix which is prepended to the
+	names of remotes.  The prefix does not automatically include a
+	trailing slash, so be sure you include one in the argument if
+	that is what you want.  This is useful if you wish to track
+	multiple projects that share a common repository.
+
 'multi-fetch'::
 	This runs fetch on all known SVN branches we're tracking.  This
 	will NOT discover new branches (unlike git-svnimport), so

git-svn.perl

@@ -70,7 +70,7 @@
 	$_version, $_upgrade, $_authors, $_branch_all_refs, @_opt_m,
 	$_merge, $_strategy, $_dry_run, $_ignore_nodate, $_non_recursive,
 	$_username, $_config_dir, $_no_auth_cache,
-	$_pager, $_color);
+	$_pager, $_color, $_prefix);
 my (@_branch_from, %tree_map, %users, %rusers, %equiv);
 my ($_svn_can_do_switch);
 my @repo_path_split_cache;
@@ -134,6 +134,7 @@
 			 'username=s' => \$_username,
 			 'config-dir=s' => \$_config_dir,
 			 'no-auth-cache' => \$_no_auth_cache,
+			 'prefix=s' => \$_prefix,
 			} ],
 	'multi-fetch' => [ \&multi_fetch,
 			'Fetch multiple trees (like git-svnimport)',
@@ -595,8 +596,9 @@ sub multi_init {
 			command_noisy('repo-config', 'svn.trunk', $trunk_url);
 		}
 	}
-	complete_url_ls_init($url, $_branches, '--branches/-b', '');
-	complete_url_ls_init($url, $_tags, '--tags/-t', 'tags/');
+	$_prefix = '' unless defined $_prefix;
+	complete_url_ls_init($url, $_branches, '--branches/-b', $_prefix);
+	complete_url_ls_init($url, $_tags, '--tags/-t', $_prefix . 'tags/');
 }
 
 sub multi_fetch {