Common Corner Case where Prompt Background bleeds into Input Field

[bytebeast]

Prompt that is longer than terminal size and wraps around, draws the background after prompt incorrectly after prompt reaches bottom of terminal.

Environment:

• Iterm2 Build 3.0.10
• MacOSX El Capitan 10.11.16
• Python 2.7.12
• Bash 4.4.0

I have been able to reproduce on several mac laptops. How to reproduce:

1. Enter a super long directory that wraps around
2. Keep pressing enter on keyboard until prompt reaches bottom of terminal.

Can someone try and reproduce, and let me know i'm not crazy.

[bytebeast]

I'm also able to reproduce using Mac Terminal Version 2.7.

[b-ryan]

[b-ryan]

Interestingly, I didn't have this issue when I initially tried to reproduce it. But normally I use the "flat" display mode so I don't have the unicode arrows in my prompt. I should test whether this is a contributing factor.

[b-ryan]

doesn't seem to be the unicode characters. I was not experiencing this when I originally attempted to reproduce because using the newline segment prevents the issue.

After more testing it appears to be related to the use of colors. I stripped out the code that adds any colors and the issue disappears. Still need to dig further into this.

[b-ryan]

I am inclined to think this is a bug with bash or some other underlying system. I have been testing with a very simple PS1 with colors:

    PS1='\[\e[48;05;10m\] \w \[\e[0m\]'

Which results in the same error. That prompt just sets the background color, prints the current directory, then resets the background color. I am getting the same bleeding with it.

[bytebeast]

Ok, I believe I found a solution:

export PS1='\[\033[48;05;10m\] \w \[\033[0m\]\[\033[0K'

Will need to test a bit more.

[b-ryan]

Woah interesting. I am curious how you found that. I tried searching around for this problem but didn't come up with anything.

[bytebeast]

Here we go ( see the Clear Line bullet point ):

• ansi escape codes

Hmm , I think the search was for "ansi color vt100 color codes lines wrap" that came up with that search result.

[bytebeast]

This appears to fix it:

diff --git a/powerline_shell/__init__.py b/powerline_shell/__init__.py
index 68eb227..603b425 100644
--- a/powerline_shell/__init__.py
+++ b/powerline_shell/__init__.py
@@ -90,7 +90,7 @@ class Powerline(object):
         self.cwd = get_valid_cwd()
         mode = config.get("mode", "patched")
         self.color_template = self.color_templates[args.shell]
-        self.reset = self.color_template % '[0m'
+        self.reset = self.color_template % '[0m\]\[\e[0K'
         self.lock = Powerline.symbols[mode]['lock']
         self.network = Powerline.symbols[mode]['network']
         self.separator = Powerline.symbols[mode]['separator']

[b-ryan]

Looks about right based on what you've provide so far. This will need some extensive testing, including against other shells.

[Zalgo2462]

I have the same issue, after applying the suggested patch, things seem to be working correctly. I am running bash 4.4.12 on Ubuntu 17.10.

[b-ryan]

The proposed fix broke things on Mac (#389 )

[shivampotdar]

As a local fix in one's bashrc - we can add in the _update_ps1 function (from the README).
PS1=${PS1//\[0m/[0m\\]\\[\\e[0K}

Essentially it is doing the thing from bytebeast's comment as a postfix (note the extra \ for escaping \ )

This change works for me!