String partial match from both left and right.

String partial match from both left and right.

[Abhijeet Rastogi]

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Hi everyone,

I have this super simple zsh completion function.

function hello() {
    arg=${@[1]}
    echo $arg
}
function _hello {
    _values -s ' ' 'dashboards' foo bar foo-bar
}
compdef _hello hello

And what I want is, if I do:-

$hello bar<TAB>

I want `foo-bar` to come in the completion menu. I figured that it has
something to do with mater-list but I can't seem to get it working.

zstyle ':completion:*' matcher-list 'm:{a-zA-Z}={A-Za-z}' 'l:|=* r:|=*'

Let me know if you guys need any more debugging info. I've been scratching
my head on this one but can't get it to work.

-- 
Cheers,
Abhijeet Rastogi (shadyabhi)

Re: String partial match from both left and right.

[Peter Stephenson]

On Fri, 31 Aug 2018 15:54:02 +0530
Abhijeet Rastogi <abhijeet.1989@gmail.com> wrote:
> Hi everyone,
> 
> I have this super simple zsh completion function.
> 
> function hello() {
>     arg=${@[1]}
>     echo $arg
> }
> function _hello {
>     _values -s ' ' 'dashboards' foo bar foo-bar
> }
> compdef _hello hello
> 
> And what I want is, if I do:-
> 
> $hello bar<TAB>
> 
> I want `foo-bar` to come in the completion menu. I figured that it has
> something to do with mater-list but I can't seem to get it working.
> 
> zstyle ':completion:*' matcher-list 'm:{a-zA-Z}={A-Za-z}' 'l:|=*
> r:|=*'

(This should really got to zsh-users as it's not about implementation.)

Best I could come up with quickly was

zstyle ':completion:*:hello:*' matcher-list 'r:|-*'

where it works if you type "-b", i.e. you need the hyphen but not
anything before it.

pws

Re: String partial match from both left and right.

[Oliver Kiddle]

Abhijeet Rastogi wrote:
> function _hello {
>     _values -s ' ' 'dashboards' foo bar foo-bar
> }
> compdef _hello hello
>
> And what I want is, if I do:-
>
> $hello bar<TAB>
>
> I want `foo-bar` to come in the completion menu. I figured that it has
> something to do with mater-list but I can't seem to get it working.

You're right that the matching control is the way to achieve this and in
particular the 'l:|=*' specification.

> zstyle ':completion:*' matcher-list 'm:{a-zA-Z}={A-Za-z}' 'l:|=* r:|=*'

That sets a global matcher to apply for all completions. It will first
try case-insensitive matching and then try again with extra characters
allowed at both the beginning (left) and end (right) of what has been
typed. When you complete bar<tab>, the "bar" candidate will match when
doing the initial case-insensitive match and is accepted. It then never
gets to try the second matching rule.

You need the l: spec in the first argument so it would work with either:
  zstyle ':completion:*' matcher-list 'l:|=*'
or:
  zstyle ':completion:*' matcher-list 'm:{a-zA-Z}={A-Za-z} l:|=* r:|=*'

That assumes you don't have any other matcher-list styles with a more
specific context.

Also, as I mentioned setting matcher-list is a fairly global setting. If
you only want this for hello then the matcher style might be more
appropriate:
  zstyle ':completion:*:hello:values:*' matcher 'l:|=*'

Alternatively you might want to specify the matcher directly in the
_hello function. For example:

  function _hello {
    _wanted dashboards expl 'dashboard' compadd -M 'l:|=*' foo bar foo-bar
  }

There are other things you might try, for example r:|-=* allows f-b to
match foo-bar.

Oliver

Re: String partial match from both left and right.

[Abhijeet Rastogi]

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Hi,

Thanks, Peter.
And special thanks to Oliver for the excellent explanation so I could up on
what you gave me. I ended up using your approach.

On Fri, Aug 31, 2018 at 4:41 PM Oliver Kiddle <okiddle@yahoo.co.uk> wrote:

> Abhijeet Rastogi wrote:
> > function _hello {
> >     _values -s ' ' 'dashboards' foo bar foo-bar
> > }
> > compdef _hello hello
> >
> > And what I want is, if I do:-
> >
> > $hello bar<TAB>
> >
> > I want `foo-bar` to come in the completion menu. I figured that it has
> > something to do with mater-list but I can't seem to get it working.
>
> You're right that the matching control is the way to achieve this and in
> particular the 'l:|=*' specification.
>
> > zstyle ':completion:*' matcher-list 'm:{a-zA-Z}={A-Za-z}' 'l:|=* r:|=*'
>
> That sets a global matcher to apply for all completions. It will first
> try case-insensitive matching and then try again with extra characters
> allowed at both the beginning (left) and end (right) of what has been
> typed. When you complete bar<tab>, the "bar" candidate will match when
> doing the initial case-insensitive match and is accepted. It then never
> gets to try the second matching rule.
>
> You need the l: spec in the first argument so it would work with either:
>   zstyle ':completion:*' matcher-list 'l:|=*'
> or:
>   zstyle ':completion:*' matcher-list 'm:{a-zA-Z}={A-Za-z} l:|=* r:|=*'
>
> That assumes you don't have any other matcher-list styles with a more
> specific context.
>
> Also, as I mentioned setting matcher-list is a fairly global setting. If
> you only want this for hello then the matcher style might be more
> appropriate:
>   zstyle ':completion:*:hello:values:*' matcher 'l:|=*'
>
> Alternatively you might want to specify the matcher directly in the
> _hello function. For example:
>
>   function _hello {
>     _wanted dashboards expl 'dashboard' compadd -M 'l:|=*' foo bar foo-bar
>   }
>
> There are other things you might try, for example r:|-=* allows f-b to
> match foo-bar.
>
> Oliver
>


-- 
Cheers,
Abhijeet Rastogi (shadyabhi)