git-clone: Keep remote names when cloning unless explicitly told not to.

With this patch the following commands all clone into the local directory
"repo". If repo exists, it will still barf.

	git-clone git://host.xz/repo.git
	git-clone /path/to/repo/.git
	git-clone host.xz:repo.git

I ended up doing the same source-to-target sed'ing for all our company
projects, so it was easier to add it directly to git-clone.

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

Documentation/git-clone.txt

@@ -8,7 +8,7 @@ git-clone - Clones a repository.
 
 SYNOPSIS
 --------
-'git-clone' [-l [-s]] [-q] [-n] [-u <upload-pack>] <repository> <directory>
+'git-clone' [-l [-s]] [-q] [-n] [-u <upload-pack>] <repository> [<directory>]
 
 DESCRIPTION
 -----------
@@ -68,17 +68,19 @@ OPTIONS
 	be any URL git-fetch supports.
 
 <directory>::
-	The name of a new directory to be cloned into.  It is an
-	error to specify an existing directory.
-
+	The name of a new directory to clone into.  The	"humanish"
+	part of the source repository is used if no directory is
+	explicitly given ("repo" for "/path/to/repo.git" and "foo"
+	for "host.xz:foo/.git").  Cloning into an existing directory
+	is not allowed.
 
 Author
 ------
 Written by Linus Torvalds <torvalds@osdl.org>
 
 Documentation
 --------------
-Documentation by Junio C Hamano.
+Documentation by Junio C Hamano and the git-list <git@vger.kernel.org>.
 
 
 GIT

git-clone.sh

@@ -96,6 +96,8 @@ if base=$(get_repo_base "$repo"); then
 fi
 
 dir="$2"
+# Try using "humanish" part of source repo if user didn't specify one
+[ -z "$dir" ] && dir=$(echo "$repo" | sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*/||g')
 mkdir "$dir" &&
 D=$(
 	(cd "$dir" && git-init-db && pwd)