'edit' plugin to open files in a text editor.

todo.actions.d/edit

@@ -0,0 +1,12 @@
+#!/bin/bash
+case $1 in
+"usage")
+  echo "$(basename $0) [BASENAME]"
+  echo "  Open \$TODO_DIR/BASENAME.txt in \$EDITOR."
+  echo "  If BASENAME is not given, defaults to 'todo'."
+  ;;
+*)
+  FILE=${2:-todo}.txt
+  $EDITOR $TODO_DIR/$FILE
+  ;;
+esac