Michael Enßlin added the comment:
The issue might very well be strictly related to GNU readline.
I have both successfully reproduced it in a C program:
#include <stdio.h>
#include <readline/readline.h>
int main() {
readline("\x1b[31;1mthis is a bold red prompt\x1b[m> ");
}
gcc -lreadline test.c
and found a fix, hinted at by this stackoverflow post:
http://stackoverflow.com/questions/9468435/look-how-to-fix-column-calculation-in-python-readline-if-use-color-prompt
Readline uses the characters \x01 and \x02 to mark invisible portions of the
prompt, so I am now pre-processing the prompt with this function:
def surround_ansi_escapes(prompt, start = "\x01", end = "\x02"):
escaped = False
result = ""
for c in prompt:
if c == "\x1b" and not escaped:
result += start + c
escaped = True
elif c.isalpha() and escaped:
result += c + end
escaped = False
else:
result += c
return result
However, in my opionion this fact deserves at least to be mentioned in the
readline documentation.
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<http://bugs.python.org/issue17337>
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