namespace completions ?

namespace completions ?

[Marc Chantreux]

hello zsh users, 

as our .zshenv grown separately and became redundant in some points, 
i made a proposal to my corworkers to easily share and collaborate on 
zsh codes. 

month later, we're happy users of the 'uze' convention: 
https://github.com/eiro/uze. but we want more! we want completion: 

saying https://github.com/eiro/uze is set and ready, i would like to
write this from the CLI: 

    mc@machine.head> a=unistra/annuaire
    mc@machine.head> . uze/$a 
    mc@machine.head> $a/<tab>

then have the completion with my namespace completed. so according to 
https://github.com/eiro/uze/blob/master/unistra/annuaire, the possible
completions would be  

    $a/search
    $a/filter/cards
    $a/filter/emails
    $a/cards
    $a/emails 

can someone help me ?  

regards

-- 
Marc Chantreux (eiro on github and freenode)
http://eiro.github.com/
http://eiro.github.com/atom.xml
"Don't believe everything you read on the Internet"
    -- Abraham Lincoln

Re: namespace completions ?

[Oliver Kiddle]

Marc Chantreux wrote:
> 
> month later, we're happy users of the 'uze' convention: 
> https://github.com/eiro/uze. but we want more! we want completion: 

It's a pity that isn't using function autoloading. It had never occurred
to me before but it apparently works to autoload functions with slashes
in their names and have them picked up out of subdirectories of your
function path.

> saying https://github.com/eiro/uze is set and ready, i would like to
> write this from the CLI: 
> 
>     mc@machine.head> a=unistra/annuaire
>     mc@machine.head> . uze/$a 
>     mc@machine.head> $a/<tab>

So basically, you want completion of shell functions to handle the
beginning of the function being a variable reference in much the same
way as is done for filename completion. By copying parts of _path_files
to _functions, this can be done by modifying _functions as in the patch
below.

I'm not sure if it makes sense to commit this or some variant of it. Any
thoughts? Having borrowed from _path_files, it relies on / to mark the
end of the variable expression.

Oliver

diff --git a/Completion/Zsh/Type/_command_names b/Completion/Zsh/Type/_command_names
index d9fc62d..31cebb0 100644
--- a/Completion/Zsh/Type/_command_names
+++ b/Completion/Zsh/Type/_command_names
@@ -8,10 +8,6 @@ local args defs ffilt
 
 zstyle -t ":completion:${curcontext}:commands" rehash && rehash
 
-zstyle -t ":completion:${curcontext}:functions" prefix-needed && \
- [[ $PREFIX != [_.]* ]] && \
- ffilt='[(I)[^_.]*]'
-
 defs=(
   'commands:external command:_path_commands'
 )
@@ -28,7 +24,7 @@ else
 
   defs=( "$defs[@]"
     'builtins:builtin command:compadd -Qk builtins'
-    "functions:shell function:compadd -k 'functions$ffilt'"
+    "functions:shell function:_functions"
     'aliases:alias:compadd -Qk aliases'
     'suffix-aliases:suffix alias:_suffix_alias_files'
     'reserved-words:reserved word:compadd -Qk reswords'
diff --git a/Completion/Zsh/Type/_functions b/Completion/Zsh/Type/_functions
index 4d33669..0f4b5c6 100644
--- a/Completion/Zsh/Type/_functions
+++ b/Completion/Zsh/Type/_functions
@@ -1,9 +1,24 @@
 #compdef unfunction
 
-local expl ffilt
+local expl funcs
+local ffilt=functions
 
 zstyle -t ":completion:${curcontext}:functions" prefix-needed && \
  [[ $PREFIX != [_.]* ]] && \
- ffilt='[(I)[^_.]*]'
+ ffilt+='[(I)[^_.]*]'
 
-_wanted functions expl 'shell function' compadd -k "$@" - "functions$ffilt"
+funcs=( ${(kP)ffilt} )
+if [[ "$PREFIX" = \$*/* && "$compstate[quote]" != \' ]]; then
+  local realstr
+  local linestr="${(M)PREFIX##*\$[^/]##/}"
+  function {
+    # do not treat an unset parameter expansion as the empty string
+    setopt localoptions nounset
+    eval 'realstr=${(e)~linestr}' 2>/dev/null
+  }
+  [[ -z "$realstr" || "$realstr" = "$linestr" ]] && return 1
+  funcs=( ${${(M)funcs:#$realstr*}##$realstr} )
+  compset -P $linestr
+fi
+
+_wanted functions expl 'shell function' compadd -a "$@" - funcs

Re: namespace completions ?

[Bart Schaefer]

On Feb 15, 12:55am, Oliver Kiddle wrote:
}
} So basically, you want completion of shell functions to handle the
} beginning of the function being a variable reference in much the same
} way as is done for filename completion. By copying parts of _path_files
} to _functions, this can be done by modifying _functions as in the patch
} below.

It might be sufficient for uze's purposes to try:

_expand_command() { _expand_word || _autocd }
compdef _expand_command -command-
zstyle :completion:expand-word:expand:-command-:: tag-order all-expansions
zstyle :completion:expand-word:expand:-command-:: suffix false

Which contrary to how it reads means to allow parameters to expand in the
command position even when the word containing them has a suffix.

It's not quite the same but it might be enough.

Re: namespace completions ?

[Marc Chantreux]

hello Bart, 


> _expand_command() { _expand_word || _autocd }
> compdef _expand_command -command-
> zstyle :completion:expand-word:expand:-command-:: tag-order all-expansions
> zstyle :completion:expand-word:expand:-command-:: suffix false 

as always when it comes to completions: 

http://www.quickmeme.com/img/d6/d6a1143f571184db25f94613edd43b40af6d3a629221aba00d9efdcfef5efd84.jpg

but yeah: i added it in my .zshrc

> It's not quite the same but it might be enough.

yes it is! thank you :) 

-- 
Marc Chantreux (eiro on github and freenode)
http://eiro.github.com/
http://eiro.github.com/atom.xml
"Don't believe everything you read on the Internet"
    -- Abraham Lincoln

Re: namespace completions ?

[Marc Chantreux]

On Sat, Feb 15, 2014 at 12:55:00AM +0100, Oliver Kiddle wrote:
> It's a pity that isn't using function autoloading. It had never occurred
> to me before but it apparently works to autoload functions with slashes
> in their names and have them picked up out of subdirectories of your
> function path. 

well. 

* i want my functions to be in the same file
* some stuff isn't autoloadable, see 
  https://github.com/eiro/uze/blob/master/unistra/annuaire#L34 

> > saying https://github.com/eiro/uze is set and ready, i would like to
> > write this from the CLI: 
> > 
> >     mc@machine.head> a=unistra/annuaire
> >     mc@machine.head> . uze/$a 
> >     mc@machine.head> $a/<tab>
> 
> So basically, you want completion of shell functions to handle the
> ...  

i started with the Bart's answer (simplier) and it works. thank you!  

regards

-- 
Marc Chantreux (eiro on github and freenode)
http://eiro.github.com/
http://eiro.github.com/atom.xml
"Don't believe everything you read on the Internet"
    -- Abraham Lincoln

Re: namespace completions ?

[Bart Schaefer]

On Feb 15, 11:16am, Marc Chantreux wrote:
}
} > _expand_command() { _expand_word || _autocd }
} > compdef _expand_command -command-
} > zstyle :completion:expand-word:expand:-command-:: tag-order all-expansions
} > zstyle :completion:expand-word:expand:-command-:: suffix false 
} 
} as always when it comes to completions: 
} 
} http://www.quickmeme.com/img/d6/d6a1143f571184db25f94613edd43b40af6d3a629221aba00d9efdcfef5efd84.jpg

Let's break it down then ...

The compdef function accepts a completion function name and a context
name.  Normally the context is a command, but it may also be one of a
number of special contexts, which for stream-of-consciousness reasons
are described in the manual in the "Autoloaded files" section under
"Completion System".  One of those contexts is "-command-" which means
you're completing the command name itself (so you can't use that name
to look up a completion for its arguments).

As it happens, the default completion function for -command- context
is _autocd.  It'd be nice if "compdef" had an option to display this
but in the meantime you have to know to examine $_comps[-command-] to
find this out.

We know that what we want is to expand a $var reference in the command
context, but _autocd won't do that.  Fortunately there is a provided
function _expand_word that can do it.  So we create a new function:

    _expand_command() { _expand_word || _autocd }

This just says that if _expand_word doesn't work, try the original
default of _autocd.  And then we replace the function for -command-
with our new one:

    compdef _expand_command -command-

This is cheating a little; the _expand_word function is supposed to be
bound to a widget, but it happens to work to call recursively into the
completion system at this point.  This won't work with all such widget
functions, I guessed that this one would and was rewarded.

The _expand_word function sets up its own zstyle context that has
the substring "expand-word" (again this is supposed to be so that you
can tell it was a different widget, but we cheat a little).  It also
call the _expand completer which sets the "expand" substring.  So you
end up with a context that looks like:

    :completion:expand-word:expand:-command-::

(Aside: If all you do is add the _expand completer to your completers
zstyle, the context is never more specific than :completion::expand:::
so you can't restrict this behavior to the -command- context.)

So we need to tell completion that in that context we want parameters
to expand everywhere.  The name of the style controlling that is
"suffix" which really means "peform expansion only in the suffix,
not in any prefix".  So to get expansion to happen in the prefix:

    zstyle :completion:expand-word:expand:-command-:: suffix false

However, that will return two completions, the expansion of $var and
the original unexpanded string.  In this particular case we don't
want to enter menu completion on those two options, we just want to
fail if there is no expansion.  That's controlled by the tag-order
style, which controls both the ordering and the inclusion of tags.
"Tags" are what the completion system calls the various categories
into which the possible completions may be divided.

This example has two useful tags, "all-expansions" and "original".
(There is also an "expansions" tag, but it doesn't do anything if
the all-expansions tag is omitted.)  If we exclude "original" by
leaving it out of the tag-order zstyle, _expand_word returns with a
single completion that is the expansion of $var OR a failure that
falls through to the _autocd default.

    zstyle :completion:expand-word:expand:-command-:: tag-order \
        all-expansions

I skipped over how you find out what the tags are.  Normally you'd
just put the cursor in the command word and type ctrl+x h to run
_complete_help.  In this case, though, that sails past _expand_word
and gives only the tags for _autocd.  To actually see the tags for
_expand_word you have to start by clearing the completer style (see
my aside, above) and adding:

    zstyle \* suffix false

Otherwise _expand aborts early, without generating any of its tags
for _complete_help to find.  (This is a case where NOBODY has any
idea what they're doing, I sort of rediscovered it by accident and
then only showed you the answer.)  Anyway, ctrl+x h now says:

    tags in context :completion:expand-word:expand:-command-::
        all-expansions expansions original  (_expand)

Ahh, better; now we know both the specific style to use to replace
the \* and also what tags to use in tag-order.  And we're done.

Re: namespace completions ?

[Marc Chantreux]

hello Bart and thank you so much for your patience.

* once again, i think i got the big picture.
* once again, got to read the doc and experiment 
* once again, i have no time for it 

i use zsh for more than 10 years and am now very opinionated about what
is writting a good zsh script but i started the documentation about
completion regulary to give up after few chapter, letting me live in
frustration.

i will show off and ask questions next time.

regards 
 
-- 
Marc Chantreux (eiro on github and freenode)
http://eiro.github.com/
http://eiro.github.com/atom.xml
"Don't believe everything you read on the Internet"
    -- Abraham Lincoln

Re: namespace completions ?

[Peter Stephenson]

On Mon, 17 Feb 2014 17:48:28 +0100
Marc Chantreux <khatar@phear.org> wrote:
> hello Bart and thank you so much for your patience.
> 
> * once again, i think i got the big picture.
> * once again, got to read the doc and experiment 
> * once again, i have no time for it 
> 
> i use zsh for more than 10 years and am now very opinionated about what
> is writting a good zsh script but i started the documentation about
> completion regulary to give up after few chapter, letting me live in
> frustration.

For something written to be readable, you might want to look at Oliver's
chapters towards the end of From Bash to Zsh: see
http://www.bash2zsh.com/ .

pws

Re: namespace completions ?

[Marc Chantreux]

> For something written to be readable, you might want to look at Oliver's
> chapters towards the end of From Bash to Zsh: see
> http://www.bash2zsh.com/ . 

thanks for the tips: i saw a link to a tutorial there and pushed it in
my "#readlater" list. 

regards

-- 
Marc Chantreux (eiro on github and freenode)
http://eiro.github.com/
http://eiro.github.com/atom.xml
"Don't believe everything you read on the Internet"
    -- Abraham Lincoln