You need to prepare a complicated, multi-part object, but you expect to do it more than once or with varying configurations.
Create a Builder to encapsulate the object production process.
The Todo.txt format provides an advanced but still plain-text method for maintaining lists of to-do items. Typing out each item by hand would provide exhausting and error-prone, however, so a TodoTxtBuilder class could save us the trouble:
The TodoTxtBuilder class takes care of all the heavy lifting of text generation and lets the programmer focus on the unique elements of each to-do item. Additionally, a command line tool or GUI could plug into this code and still retain support for later, more advanced versions of the format with ease.
Instead of creating a new instance of the needed object from scratch every time, we shift the burden to a separate object that we can then tweak during the object creation process.
Expand the project- and context-tag generation code to filter out duplicate entries.
Some Todo.txt users like to insert project and context tags inside the description of their to-do items. Add code to identify these tags and filter them out of the end tags.