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Re: [Help-bash] Expand a prompt string to calculate its length?
From: |
Andy Chu |
Subject: |
Re: [Help-bash] Expand a prompt string to calculate its length? |
Date: |
Wed, 19 Jun 2019 11:18:29 -0700 |
The @P techniques works if you don't have color in your prompt. If you
have colors I'm not sure there's a way to do it in general.
The \[ and \] escape codes in PS1 are used to compensate for color when
passing to GNU readline. They get translated to \0x00 and \0x01 if I
remember correctly. GNU readline also has to have a notion of the prompt
width.
Andy
On Wed, Jun 19, 2019 at 11:14 AM Greg Wooledge <address@hidden> wrote:
> On Wed, Jun 19, 2019 at 01:09:33PM -0500, Jesse Hathaway wrote:
> > Is there anyway to expand a partial prompt string to calculate its
> length?
>
> In bash 4.4 and above, yes.
>
> wooledg:~$ tmp=${PS1@P}; echo "<$PS1> <${#PS1}> <$tmp> <${#tmp}>"
> <\h:\w\$ > <8> <wooledg:~$ > <11>
>
> The @P parameter expansion is one of the new "Parameter transformation"
> options.
>
>
- [Help-bash] Expand a prompt string to calculate its length?, Jesse Hathaway, 2019/06/19
- Re: [Help-bash] Expand a prompt string to calculate its length?, Greg Wooledge, 2019/06/19
- Re: [Help-bash] Expand a prompt string to calculate its length?,
Andy Chu <=
- Re: [Help-bash] Expand a prompt string to calculate its length?, Greg Wooledge, 2019/06/19
- Re: [Help-bash] Expand a prompt string to calculate its length?, Jesse Hathaway, 2019/06/19
- Re: [Help-bash] Expand a prompt string to calculate its length?, Greg Wooledge, 2019/06/19
- Re: [Help-bash] Expand a prompt string to calculate its length?, Andy Chu, 2019/06/19
- Re: [Help-bash] Expand a prompt string to calculate its length?, Greg Wooledge, 2019/06/19
- Re: [Help-bash] Expand a prompt string to calculate its length?, Andy Chu, 2019/06/19
- Re: [Help-bash] Expand a prompt string to calculate its length?, Jesse Hathaway, 2019/06/21