One of my custom Calva REPL commands that I use the most:
"calva.customREPLCommandSnippets": [
//...
{
"name": "Println Current Form",
"key": "p",
"snippet": "(println $current-form)"
},
//...
],
It’s silly simple, but I just find myself with expressions evaluating to strings of CSS, JS, HTML, whatever so often. Printing it to the output destination makes it super simple to copy. (Unless your output destination is the REPL Window, but hopefully it isn’t!)