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historyPath = os.path.expanduser("~/.pyhistory")
def save_history(historyPath=historyPath):
import readline
readline.write_history_file(historyPath)
if os.path.exists(historyPath):
readline.read_history_file(historyPath)
term_with_colors = ['xterm', 'xterm-color', 'xterm-256color', 'linux', 'screen', 'screen-256color', 'screen-bce']
if os.environ.get('TERM') in term_with_colors:
green='\033[32m'
red='\033[31m'
reset='\033[0m'
sys.ps1 = red + '>>> ' + reset
sys.ps2 = green + '... ' + reset
del term_with_colors
atexit.register(save_history)
del os, sys, atexit, readline, rlcompleter, save_history, historyPath
Now I get context sensitive completion and color prompt.
The problem comes from color prompt - when I invoke
history-search-backward
(by pressing
UP
) in an interactive Python session, Readline takes in account terminal escape sequences, so the cursor position is wrongly calculated and the text is wrongly displayed.
In Bash man page this problem is mentioned and fixed by special markers:
\[ begin a sequence of non-printing characters,
which could be used to embed a
terminal control sequence into the prompt
\] end a sequence of non-printing characters
How to fix this issue for Python prompt?
-- Function: int rl_expand_prompt (char *prompt)
Expand any special character sequences in PROMPT and set up the
local Readline prompt redisplay variables. This function is
called by `readline()'. It may also be called to expand the
primary prompt if the `rl_on_new_line_with_prompt()' function or
`rl_already_prompted' variable is used. It returns the number of
visible characters on the last line of the (possibly multi-line)
prompt. Applications may indicate that the prompt contains
characters that take up no physical screen space when displayed by
bracketing a sequence of such characters with the special markers
`RL_PROMPT_START_IGNORE' and `RL_PROMPT_END_IGNORE' (declared in
`readline.h'. This may be used to embed terminal-specific escape
sequences in prompts.
As text suggested I searched for
RL_PROMPT_START_IGNORE
and
RL_PROMPT_END_IGNORE
definition in
readline.h
and found next:
/* Definitions available for use by readline clients. */
#define RL_PROMPT_START_IGNORE '\001'
#define RL_PROMPT_END_IGNORE '\002'
So I put appropriate changes to my
~/.pystartup
:
green='\001\033[32m\002'
red='\001\033[31m\002'
reset='\001\033[0m\002'
and now all work fine!!!
–
–
If you happen to come here because of recent
Python 3.10+
REPL (CLI) problems in Win10, then please have a look here:
https://github.com/pyreadline/pyreadline/issues/73
Change Python interactive prompt ">>>"
Some of these issues has now been fixed in a better maintained repo:
https://github.com/pyreadline3/pyreadline3/
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