Strip ANSI sequences from string through bash-python code

Question

I try to use bash to strip ANSI color escape sequences from a string without success. I tried already some regex-based code.

#!/bin/bash

Blue='\033[0;34m'         # Blue
Clear='\033[0m'           # Text Reset
removeColors (){
local uncolored_string=''
local import_row='import re; \n'
local regex_='(\x9B|\x1B\[)[0-?]*[ -\/]*[@-~]'
local func_def_row='def escape_ansi(line): \n'
local ansi_escape_row=&quot;ansi_escape=re.compile(r\'$regex_\') \n&quot; 
local return_row=&quot;return ansi_escape.sub('', line) \n&quot;
local print_row=&quot;print escape_ansi(line = '$1')&quot;

local code=&quot;$import_row$func_def_row$ansi_escape_row$return_row$print_row&quot;

echo $(python -c $code)
}
str="Press ${Blue}any key${Clear} to continue..."
echo -e "$str"
removeColors "$str"

I still receive the code below.

  File "<string>", line 1
    import
         ^
SyntaxError: invalid syntax

Can you help me?

Update:

I found the python library strip-ansi.

removeColors (){
    local uncolored_string=''
    local ansi_snippet="$1"

echo &quot;$(python3 -c &quot;from strip_ansi import strip_ansi; print(strip_ansi(\&quot;$ansi_snippet\&quot;))&quot;)&quot;
}

However, even after installing it, I receive the error below:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'strip_ansi'

I really don't understand what you're trying to do here, however you'd get the same error from python -c import, so perhaps the first issue is the unquoted shell variable $code? — steeldriver, Feb 07 '22 at 00:12
... fwiw I'd suggest using a here document for stuff like this, rather than trying to munge everything into a multiline string. See for example Hybrid code in shell scripts. Sharing variables — steeldriver, Feb 07 '22 at 01:16
The \n is not taken literal here. You could use $'...'. However, you have also increment errors for ansi_escape_row and return_row. And probably other issues as well. Better not to mix shell and python code. — pLumo, Feb 07 '22 at 07:56
I updated the question with some progress. May you further investigate this enigma? — Bruno Lobo, Feb 07 '22 at 15:13
How did you install it? Which python version does pip -V return. If 2.x, you can try pip3 install strip_ansi or python3 -m pip install strip_ansi — pLumo, Feb 07 '22 at 15:14
Pip version: pip 22.0.3 from $path (python 3.8) pip3 install strip-ansi: Requirement already satisfied: strip-ansi in $LOCAL_PATH — Bruno Lobo, Feb 07 '22 at 15:19
You install strip-ansi, but use strip_ansi with underscore. Documentation has two different versions of their installation instructions ?! — pLumo, Feb 07 '22 at 15:29
THe library ansi2txt seemed great, but do not worked for the example: echo "$(echo "Press \033[0;34many key\033[0m to continue..." | ansi2txt | col -b)" May you run it for me, sir? — Bruno Lobo, Feb 07 '22 at 15:37
The problem is echo , it does not evaluate to ansi codes. Use echo -e or printf and it works just fine. — pLumo, Feb 07 '22 at 15:40

Bruno Lobo · Answer 1 · 2022-02-07T15:47:39.367

1

Solution: echo -e "$1" | ansi2txt | col -b

edited Feb 07 '22 at 15:47

answered Feb 07 '22 at 14:19

Bruno Lobo

301

Strip ANSI sequences from string through bash-python code

1 Answers1