This is the = command that adds a new column based on a Python expression you provide. You can reference the cells in the current row based on the column name.
It is also possible to create a column based on the output of a shell command.
VisiData is row based, not cell based, so you cannot create expressions that reference data across rows.
I am seeing this issue on a Mac with ghostty but not with wezterm, from the same binary. Ghostty shows some correct characters and some diamond-question marks, and a line usually contains one or the other. The ghostty inspector shows the diamonds are not the blocks.
Thank you for doing this, this is fun. Also, I love all the nostalgic comments.
I'm surprised no one has mentioned Robert Tinney the artist who illustrated many of the covers. His work is pretty amazing, and seemed to capture all sorts of interesting ideas.
I met him once at a computer show. I was in too much in awe that I didn't really talk with him, but was able to give him some praise for his artwork. Also, I bought one of the t-shirts with his artwork.
It is also possible to create a column based on the output of a shell command.
VisiData is row based, not cell based, so you cannot create expressions that reference data across rows.