Customizable single character surroundings

[echasnovski]

Contributing guidelines

• I have read CONTRIBUTING.md
• I have read CODE_OF_CONDUCT.md

Module(s)

mini.surround

Description

Figure out a reasonable way to allow users supply their own single character surrounding. This should work for both 'input' (more complex and seems to be less needed) and 'output' (simpler and more in demand). Probably should be in the format of a table with find+extract for 'input' and left+right for 'output' (see special_* functions). Maybe allow them to be functions for interactive input.

Use cases:

• Insert surrounding with spaces (Spacing around parentheses/brackets #16).
• Insert LaTeX operator (mini.surround latex operator? #6).
• Maybe even insert on separate lines, but this is unlikely to fit here.

[echasnovski]

Implemented in 19b0f13 .