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bug#24483: 25.1; sql-mode error due to nil prompt-cont-regexp


From: Michael Kleehammer
Subject: bug#24483: 25.1; sql-mode error due to nil prompt-cont-regexp
Date: Tue, 20 Sep 2016 12:48:56 -0500

It looks like sql-interactive-remove-continuation-prompt needs to explicitly 
check for a nil sql-prompt-cont-regexp, which is the default value for some SQL 
products.

In particular, this line marked with an arrow on the left needs a guard:

    (when (and comint-prompt-regexp
               (or (> (length (or sql-preoutput-hold "")) 0)
                   (> (or sql-output-newline-count 0) 0)
                   (not (or (string-match sql-prompt-regexp oline)
    -->                     (string-match sql-prompt-cont-regexp oline)))))

In my case I am using a custom "SQL product" for a SQL Server command
line utility which prints "Connected to xyzzy\n" on startup but there
are some standard "products" that also don't have a prompt-cont-regexp
set.

It should be easy to reproduce using "ansi", but here is how I
reproduced it with PostgreSQL:

1) Set the PostgreSQL regexp to nil:

    (sql-set-product-feature 'postgres :prompt-cont-regexp nil)

2) Make sure psql prints something on connect.  I have this in my
   ~/.psqlrc:

    \pset null ยค

When you open a connection using sql-postgres you'll get:

    error in process filter: sql-interactive-remove-continuation-prompt: Wrong 
type argument: stringp, nil
    error in process filter: Wrong type argument: stringp, nil

This is new in 25.1.  I used 24.5 and did not have this issue. 

Thanks,
Michael Kleehammer
address@hidden


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