Module textwrap::core

Building blocks for advanced wrapping functionality.

The functions and structs in this module can be used to implement advanced wrapping functionality when wrap() fill() don’t do what you want.

In general, you want to follow these steps when wrapping something:

1. Split your input into Fragments. These are abstract blocks of text or content which can be wrapped into lines. See WordSeparator for how to do this for text.

2. Potentially split your fragments into smaller pieces. This allows you to implement things like hyphenation. If you use the Word type, you can use WordSplitter enum for this.

3. Potentially break apart fragments that are still too large to fit on a single line. This is implemented in break_words.

4. Finally take your fragments and put them into lines. There are two algorithms for this in the wrap_algorithms module: wrap_optimal_fit and wrap_first_fit. The former produces better line breaks, the latter is faster.

5. Iterate through the slices returned by the wrapping functions and construct your lines of output.

Please open an issue if the functionality here is not sufficient or if you have ideas for improving it. We would love to hear from you!

Structs

• Word
  A piece of wrappable text, including any trailing whitespace.

Traits

• Fragment
  A (text) fragment denotes the unit which we wrap into lines.

Functions

• break_words
  Forcibly break words wider than line_width into smaller words.
• display_width
  Compute the display width of text while skipping over ANSI escape sequences.