Add support for `vcsh pull`

This pulls all vcsh repos one after the other.

_vcsh

@@ -43,6 +43,10 @@ function _vcsh-list-tracked-by () {
 	(( CURRENT == 2 )) && __vcsh_repositories
 }
 
+function _vcsh-pull () {
+	_nothing
+}
+
 function _vcsh-rename () {
 	(( CURRENT == 2 )) && __vcsh_repositories
 	(( CURRENT == 3 )) && _message "new repository name"
@@ -88,6 +92,7 @@ function _vcsh () {
 		"list:list all local vcsh repositories"
 		"list-tracked:list all files tracked by vcsh"
 		"list-tracked-by:list files tracked by a repository"
+		"pull:pull from all vcsh remotes"
 		"rename:rename a repository"
 		"run:run command with <\$GIT_DIR> and <\$GIT_WORK_TREE> set"
 		"upgrade:upgrade repository to currently recommended settings"

doc/vcsh.1.ronn

@@ -21,6 +21,8 @@ vcsh(1) - Version Control System for $HOME - multiple Git repositories in $HOME
 
 `vcsh` list-tracked-by <repo>
 
+`vcsh` pull
+
 `vcsh` rename <repo> <newname>
 
 `vcsh` run <repo> <shell command>
@@ -98,6 +100,9 @@ an interactive user.
 * list-tracked-by:
   List files tracked by a repository.
 
+* pull:
+  Pull from all vcsh remotes.
+
 * rename:
   Rename a repository.
 

vcsh

@@ -100,6 +100,7 @@ help() {
    list-tracked         List all files tracked by vcsh
    list-tracked-by \\
         <repo>          List files tracked by a repository
+   pull                 Pull from all vcsh remotes
    rename <repo> \\
           <newname>     Rename repository
    run <repo> \\
@@ -222,6 +223,17 @@ list_tracked_by() {
 	git ls-files | sort -u
 }
 
+pull() {
+	hook pre-pull
+	for VCSH_REPO_NAME in $(list); do
+		echo -n "$VCSH_REPO_NAME: "
+		export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
+		use
+		git pull
+	done
+	hook post-pull
+}
+
 rename() {
 	git_dir_exists
 	[ -d "$GIT_DIR_NEW" ] && fatal "'$GIT_DIR_NEW' exists" 54
@@ -328,7 +340,8 @@ elif [ "$1" = 'delete' ]           ||
 	[ "$VCSH_COMMAND" = 'run' ] && shift 2
 	[ "$VCSH_COMMAND" = 'write-gitignore' ]
 elif [ "$1" = 'list' ] ||
-     [ "$1" = 'list-tracked' ]; then
+     [ "$1" = 'list-tracked' ] ||
+     [ "$1" = 'pull' ]; then
 	export VCSH_COMMAND="$1"
 elif [ -n "$2" ]; then
 	export VCSH_COMMAND='run'