[#40] first pass at bash completion

completion/lab.bash_completion.sh

@@ -0,0 +1,39 @@
+# Based on hub's autocompletion script at: https://github.com/github/hub
+# If there is no git tab completion, but we have the _completion loader try to load it
+if ! declare -F _git > /dev/null && declare -F _completion_loader > /dev/null; then
+  _completion_loader git
+fi
+
+# Check that git tab completion is available
+if declare -F _git > /dev/null; then
+  # Duplicate and rename the 'list_all_commands' function
+  eval "$(declare -f __git_list_all_commands | \
+      sed 's/__git_list_all_commands ()/__git__list__all__commands_without_lab ()/')"
+
+  # Wrap the 'list_all_commands' function with extra lab commands
+  __git_list_all_commands() {
+    cat <<-EOF
+fork
+mr
+issue
+merge-request
+EOF
+    __git__list__all__commands_without_lab
+  }
+
+  # Ensure cached commands are cleared
+  __git_all_commands=""
+
+  _git_issue ()
+  {
+       __gitcomp "create list"
+  }
+
+  _git_mr ()
+  {
+       __gitcomp "checkout create list"
+  }
+
+  complete -o bashdefault -o default -o nospace -F _git lab 2>/dev/null \
+    || complete -o default -o nospace -F _git lab
+fi