Resolve the problem with the color prompt messing up cursor position #45
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When scrolling through history with ↑/↓, once a sufficiently long line was shown, the cursor would not be returned to the beginning of the line and a portion of the previous line would be shown. It turns out that this can be avoided if we wrap the color escape sequences with \1 … \2, which tells the terminal (?) that the sequence is zero-width. (The sequence is for the terminal, but maybe python, or libreadline, is smart enough to take this into account. I'm hazy on the details.)
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When scrolling through history with ↑/↓, once a sufficiently long line was shown, the cursor would not be returned to the beginning of the line and a portion of the previous line would be shown.
It turns out that this can be avoided if we wrap the color escape sequences with \1 … \2, which tells the terminal (?) that the sequence is zero-width. (The sequence is for the terminal, but maybe python, or libreadline, is smart enough to take this into account. I'm hazy on the details.)