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Re: [Bug-apl] Gnu APL and ANSI escape sequences

From: Juergen Sauermann
Subject: Re: [Bug-apl] Gnu APL and ANSI escape sequences
Date: Mon, 17 Feb 2014 15:00:52 +0100
User-agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130330 Thunderbird/17.0.5

Hi Fred,

I believe you simply need to create the sequence and insert it into the other text as appropriate, eg:

      ESCSEQ←(⎕UCS 27),'[0;35;48m'    ⍝ RED foreground


Note that ⎕UCS is more portable than ⎕AV or ⎕AF.

/// Jürgen

On 02/14/2014 10:04 PM, Frederick H. Pitts wrote:
Gentle people,

	Is there a way for a Gnu APL program to send ANSI escape sequences to
the terminal in which the iterpreter is running? 

	If not, I wish to propose the following:  The ⍞ handling be extended by
implementing an alternative mode where only the content of the last
assign to ⍞ be retained in quote-quad-prompt instead of appending the
content of all consecutive assigns up to the point ⍞ is referenced. In
the alternative mode quote-quad-prompt should be emptied when ⍞ is
referenced, just like it is currently.  The alternative mode could be
activated by setting a boolean control flag (e.g., ⎕QQ ← 1 or maybe
adding another element to ⎕FC).  As the ⍞ handling currently works,
assigning a ANSI escape sequence to ⍞ produces the desired result on the
screen, but as soon as one references ⍞ (even after assigning a
character vector not containing escape sequences) garbage appears in the
user's response.

	Please find attached ANSI_TEST.apl.gz.  The file demonstrates the above

	If there is a way for Gnu APL to send escape sequences to its terminal,
please let me know and I apologize for wasting your time.


Retired Chemical Engineer

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