As per defined in the sacred Gopher RFC 1436 of old renown, "The
length of the User displayable line should be less than 70
characters". You may check for that as you write your phlog entries.
However what about those gemtexts from the flashy new kid on the
block: gemini? Well, you could do it manually, create your own
script; that's fun! Or, be sensible and use the standard fmt.
For example:
fmt -g65 example.gmi > example.txt
Will get your example.gmi file and "civilize" it by shortening each
line to 65 characters, not breaking words in the process.
However, because some words can be way too long, and because some
screens these days can be way too small I prefer to shorten my
lines to 65 at most.
fmt behaviour can change from system to system. This example works
on sdf. If in trouble, try 'man fmt'.