06/16/81  APL context editing

The MR9.0 release of APL offers some new requests which provide a
context editing capability.  These requests allow searching for a
specified string in a function, substitution of one string for
another, and selection of all lines in a function containing a
specified string.


Notes on Syntax:
The context editing commands are provided as an extension to the
regular APL editor.  Request lines beginning with a dot are
interpreted as context editing commands.  A slash is used as the
string delimiter.  The slash character may not appear inside a
search or substitution string.  No other editor requests may
follow a context request on the same line.


Context searching:

./string/

Searches for the first line in the function containing "string".
The search begins at the current line and proceeds to the end of
the function, then continues from the top of the function to the
original line.  The line which contains "string" is displayed.
If an empty search string is specified (//), the previous search
string is used.  The slash character may not appear in the search
string.


Reverse searching:

.</string/

Searches backwards (toward the beginning of the function) for
"string".  The search begins on the current line of the function
and proceeds to the beginning of the function, then continues
from the bottom of the function to the original line.  The line
which contains "string" is displayed.  If an empty search string
is specified (//), the previous search string is used.  The slash
character may not appear in the search string.


Substitution:

.s/string1/string2/

Substitutes "string2" for the first occurance of "string1" in the
current line.  The line is displayed after the substitution is
made.  If string1 is empty, the previous search string or
substitute string1 is used.  If string2 is empty, string1 is
deleted from the line.  The slash character may not appear in
either substitute string.

.s/string1/string2/p

If a "p" is typed at the end of a substitute request, the line is
displayed after the change has been made.


.s/string1/string2/?

If a "?" is typed at the end of a substitute request, the line is
displayed with the substitution made, and the user is asked if
the substitution is correct.  The change is actually made only if the
user answers "yes".


Global line selection:

.g/string/

Finds  and  display all lines in the function containing "string".
The slash character may not appear in the string.  The current
line is not changed.


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Historical Background

This edition of the Multics software materials and documentation is provided and donated
to Massachusetts Institute of Technology by Group BULL including BULL HN Information Systems Inc. 
as a contribution to computer science knowledge.  
This donation is made also to give evidence of the common contributions of Massachusetts Institute of Technology,
Bell Laboratories, General Electric, Honeywell Information Systems Inc., Honeywell BULL Inc., Groupe BULL
and BULL HN Information Systems Inc. to the development of this operating system. 
Multics development was initiated by Massachusetts Institute of Technology Project MAC (1963-1970),
renamed the MIT Laboratory for Computer Science and Artificial Intelligence in the mid 1970s, under the leadership
of Professor Fernando Jose Corbato. Users consider that Multics provided the best software architecture 
for managing computer hardware properly and for executing programs. Many subsequent operating systems 
incorporated Multics principles.
Multics was distributed in 1975 to 2000 by Group Bull in Europe , and in the U.S. by Bull HN Information Systems Inc., 
as successor in interest by change in name only to Honeywell Bull Inc. and Honeywell Information Systems Inc. .

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Permission to use, copy, modify, and distribute these programs and their documentation for any purpose and without
fee is hereby granted,provided that the below copyright notice and historical background appear in all copies
and that both the copyright notice and historical background and this permission notice appear in supporting
documentation, and that the names of MIT, HIS, BULL or BULL HN not be used in advertising or publicity pertaining
to distribution of the programs without specific prior written permission.
    Copyright 1972 by Massachusetts Institute of Technology and Honeywell Information Systems Inc.
    Copyright 2006 by BULL HN Information Systems Inc.
    Copyright 2006 by Bull SAS
    All Rights Reserved