Add enter function for easier interaction with git repo.

Run a subshell with all git variables set. This can be used to easily
interact with your git repository. This is also useful if you are using
Emacs Tramp and magit to manage your directory.

Signed-off-by: Sébastien Gross <seb•ɑƬ•chezwam•ɖɵʈ•org>

yadm

@@ -53,7 +53,7 @@ function main() {
 
   #; parse command line arguments
   local retval=0
-  internal_commands="^(alt|bootstrap|clean|clone|config|decrypt|encrypt|help|init|list|perms|version)$"
+  internal_commands="^(alt|bootstrap|clean|clone|config|decrypt|encrypt|enter|help|init|list|perms|version)$"
   if [ -z "$*" ] ; then
     #; no argumnts will result in help()
     help
@@ -408,6 +408,13 @@ function encrypt() {
 
 }
 
+function enter() {
+    require_repo
+    echo "Entering repo"
+    $SHELL
+    echo "Leaving repo"
+}
+
 function git_command() {
 
   require_repo