So, for example, I copy/paste the second paragraph, above, into a vi (editor) session.
Then I copy the URL to the post containing it.
Then, in the editor, in "command mode", I execute these keystrokes with the cursor on the line containing the text:
which transforms the text to the right sequence of text and tags to result in this when displayed to you:
Take creating a multi-line "quote" of some lines of<br>> content, with the option to associate a URL with it, doing<br>> so in a way that helps the Midnight Pub post rendering<br>> code path "do the right thing" (i.e. what I want it to<br>> do) with respect to keeping the text to no more than 60<br>> columns, while having line breaks that *don't* cause the<br>> aforementioned code path to essentially double line break<br>> the lines by wrapping then all in html paragraph tags....<br>><br>> - https://miso.town/post?id=29
("y1" is the name of the script... the '!!' tells vi to run the script against selected standard input, replacing it with the standard output of the command)