Re: Redirection completion

[Peter Stephenson <pws@csr.com>]

Sven Wischnowsky wrote:
> It uses the comma-separated sub-contexts discussed. For values it is
> `-value-,<name>,<cmd>', so I've not put the parameter type in it, as
> suggested by Oliver. For redirection it is `-redirect-,<op>,<cmd>'.

The following redirections for compressed files seem to work quite
nicely --- uncompress input from the appropriate compressed file type, and
compress output into it.  Was anyone planning anything more sophisticated?

> For example, completion after `foo=<TAB>' makes _value try:
> 
>   1) -value-,foo,
>   2) -value-,foo,-default-
>   3) -value-,-default-,-default-
> 
> in this order.

It seems vaguely preferable to allow the user to omit trailing
`,-default-' bits when defining commands (it's not important in style
contexts since you would usually use a wildcard anyway), but it doesn't
actually gain you anything apart from laxity.

> I.e.:
> should `-redirect-,-default-,echo' or `-redirect-,>,-default-' take
> precedence?

It seems more logical that the command variant should take precedence,
although the order of the parts would imply otherwise.

> And another question where the default-handling is important is: when
> should post-patterns (-P) be tried? Currently this is done only if we
> would otherwise use the function defined for the least specific
> context (the one with all parts being `-default-').

This seems OK unless we do something more complicated with pattern
handling, e.g. some way of matching the point at which you want the
pattern tried.  But I don't see any great call for that at the moment.

Index: Completion/Unix/Command/_bzip2
===================================================================
RCS file: /cvsroot/zsh/zsh/Completion/Unix/Command/_bzip2,v
retrieving revision 1.1
diff -u -r1.1 _bzip2
--- Completion/Unix/Command/_bzip2	2 Apr 2001 11:46:03 -0000	1.1
+++ Completion/Unix/Command/_bzip2	13 Mar 2002 16:34:23 -0000
@@ -1,4 +1,4 @@
-#compdef bzip2 bunzip2 bzcat=bunzip2 bzip2recover
+#compdef bzip2 bunzip2 bzcat=bunzip2 bzip2recover -redirect-,<,bunzip2=bunzip2 -redirect-,>,bzip2=bunzip2
 
 local decompress expl state line curcontext="$curcontext"
 typeset -A opt_args
Index: Completion/Unix/Command/_compress
===================================================================
RCS file: /cvsroot/zsh/zsh/Completion/Unix/Command/_compress,v
retrieving revision 1.1
diff -u -r1.1 _compress
--- Completion/Unix/Command/_compress	2 Apr 2001 11:46:37 -0000	1.1
+++ Completion/Unix/Command/_compress	13 Mar 2002 16:34:23 -0000
@@ -1,4 +1,4 @@
-#compdef compress uncompress
+#compdef compress uncompress -redirect-,<,uncompress=uncompress -redirect-,>,compress=uncompress
 
 local expl state line bits common_args1 common_args2 decompress
 local curcontext="$curcontext"
Index: Completion/Unix/Command/_gzip
===================================================================
RCS file: /cvsroot/zsh/zsh/Completion/Unix/Command/_gzip,v
retrieving revision 1.2
diff -u -r1.2 _gzip
--- Completion/Unix/Command/_gzip	31 Jul 2001 13:54:04 -0000	1.2
+++ Completion/Unix/Command/_gzip	13 Mar 2002 16:34:23 -0000
@@ -1,4 +1,4 @@
-#compdef gzip gunzip gzcat=gunzip
+#compdef gzip gunzip gzcat=gunzip -redirect-,<,gunzip=gunzip -redirect-,>,gzip=gunzip
 
 local decompress expl curcontext="$curcontext" state line
 typeset -A opt_args

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 392070


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