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I would like to test in an operator-pending mapping whether the cursor is on the last position of the line. I currently have this, but it does not work:
onoremap <expr> i$ col('.') == col('$') ? ':…<CR>' : ':…<CR>'
How can I test whether the cursor is on the last position of the line?
Related to this:
Try this instead:
col('.') >= col('$') - 1
col('$') returns the number of the bytes in the cursor line plus one. Unless you have 'virtualedit' set, the cursor will never be in that position. (I'm using >= instead of == in case you do have 'virtualedit' set.)
I'm not 100% sure what you mean by these tests, but you can find the documentation for col() at :help col().
One way to test such a condition on the command line is to evaluate it as an expression and print out the result echo:
:echo col('.') >= col('$') - 1
:help functions, so having a skim through that might be a start.
:echo (see the end of my answer). In other contexts, you might want to use :let or :call from the command line.