Add todo.txt addons

.todo.actions.d/edit

@@ -0,0 +1,20 @@
+#!/bin/bash
+case $1 in
+"usage")
+  echo "$(basename $0) [BASENAME]"
+  echo "  Open \$TODO_DIR/BASENAME.txt in \$EDITOR."
+  echo "  If BASENAME is not given, defaults to 'todo'."
+  ;;
+*)
+  if [[ -z $2 ]]; then
+    FILE=$TODO_FILE
+  else
+    FILE=$TODO_DIR/$2.txt
+  fi
+  if [ -n "$EDITOR" ]; then
+    $EDITOR "$FILE"
+  else
+    echo "Error: The EDITOR environment variable is not set"
+  fi
+  ;;
+esac