This is a copy of the af-magic theme by andyfleming, but with a dynamically-resizing prompt based on a minimum amount of whitespace which can be set by the user. The prompt changes by collapsing the prompt either by using the shrink-path plugin or by truncating it to only show the last segments (this can also be set by the user). See comments for details.

Set the following shell variables in your .zshrc file to customize the theme.

MIN_PROMPT_WHITESPACE - Specifies the minimum number of characters to reserve for entering commands. The directory path shortens to accommodate this number. This is set to 60 by default.

ENABLE_SHRINK_PROMPT - Will use the shrink-path plugin (which must be installed separately) to truncate parent directories to single letter (see below). Note that this can decrease performance.