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Re: promptcr workaround
- X-seq: zsh-workers 20900
- From: Wayne Davison <wayned@xxxxxxxxxxxxxxxxxxxxx>
- To: zsh-workers@xxxxxxxxxx
- Subject: Re: promptcr workaround
- Date: Tue, 1 Mar 2005 09:06:28 -0800
- In-reply-to: <20050301164119.GA32736@xxxxxxxxx>
- Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm
- References: <quack.20050301T0017.874qfvbx08@xxxxxxxxxxxxxxxxxxxxx> <20050301164119.GA32736@xxxxxxxxx>
What do folks think of including this idea in the FAQ? I've attached a
patch that does this.
..wayne..
--- Etc/FAQ.yo 17 Jan 2005 10:49:51 -0000 1.15
+++ Etc/FAQ.yo 1 Mar 2005 17:03:56 -0000
@@ -1667,15 +1667,25 @@ sect(How do I prevent the prompt overwri
% echo -n foo
%
)
- and the tt(foo) has been overwritten by the prompt tt(%). The answer is
- simple: put tt(unsetopt promptcr) in your tt(.zshrc). The option \
- tt(PROMPT_CR),
- to print a carriage return before a new prompt, is set by default because
- a prompt at the right hand side (mytt($RPROMPT), mytt($RPS1)) will not appear
- in the right place, and multi-line editing will be confused about the line
- position, unless the line starts in the left hand column. Apart from
- tt(PROMPT_CR), you can force this to happen by putting a newline in the
- prompt (see question link(3.13)(313) for that).
+ and the tt(foo) has been overwritten by the prompt tt(%). The reason this
+ happens is that the option tt(PROMPT_CR) is enabled by default, and it
+ outputs a carriage return before the prompt in order to ensure that the
+ line editor knows what column it is in (this is needed to position the
+ right-side prompt correctly (mytt($RPROMPT), mytt($RPS1)) and to avoid screen
+ corruption when performing line editing). If you add tt(unsetopt promptcr)
+ to your tt(.zshrc), you will see any partial output, but your screen may
+ look weird until you press return or refresh the screen. A better
+ solution for many terminals is to define a precmd function that outputs
+ a screen-width of spaces, like this:
+ verb(
+ function precmd {
+ echo -n ${(l:$COLUMNS:::):-}
+ }
+ )
+ That precmd function will only bump the screen down to a new line if
+ there was output on the prompt line, otherwise the extra spaces get
+ removed by the tt(PROMPT_CR) action. One final alternative is to put a
+ newline in your prompt -- see question link(3.13)(313) for that.
sect(What's wrong with cut and paste on my xterm?)
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