documentation to avoid newline in prompt gotcha

[ian-kelling]

Ran into this gotcha, would like to warn the next person. Feel free to change wording :)

[monsanto]

Hmm, that is odd. I unfortunately don't have time to look into this now (patches welcome!) Here are some thoughts.

• The readline parser does not care what your prompt is, it uses (comint-bol) to figure out where the end of the prompt is. Could you test to see if that function correctly identifies the start of the command?
• If it doesn't, is your shell-prompt-pattern setup correctly?
• If you look at https://github.com/monsanto/readline-complete.el/blob/master/readline-complete.el#L227 you'll see that ac-rlc provides different completion styles based on whether your prompt matches a particular regex. Is your particular prompt regex in this list?
• If all else fails, maybe there is a limitation in backwards regexp matching?

[ian-kelling]

Initially shell-prompt-pattern was not setup correctly. Fixing this allowed completion, but auto-complete is still failing. I can debug this further, but I'm putting it off for now and onto my todo list. The pull request isn't right, since this isn't just some inherent limitation as I initially guessed.