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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <120521091901.ZM32541@torch.brasslantern.com>
Date: Mon, 21 May 2012 09:19:01 -0700
In-reply-to: <8CECA1C5-C06C-4888-B5C9-21C8DF5EC2C6@gmail.com>
Comments: In reply to Hong Xu <xuhdev@gmail.com>
 "Suggestion: chmod +x auto completion only completes files that do not have
 executable permission" (May 18,  4:56pm)
References: <8CECA1C5-C06C-4888-B5C9-21C8DF5EC2C6@gmail.com>
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To: Hong Xu <xuhdev@gmail.com>, "zsh-workers@zsh.org " <zsh-workers@zsh.org>
Subject: Re: Suggestion: chmod +x auto completion only completes files that do
 not have executable permission
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On May 18,  4:56pm, Hong Xu wrote:
}
} I have a suggestion about chmod auto completion here. We could
} complete only chmod +x with files that do not have executable
} permission, and vice versa. We could also apply this rule to chmod +r,
} chmod +w, etc. What do you think?

As far as I can tell, chmod completion already does this.  _chmod has
this snippet:

    for spec in ${(s:,:)words[2]}               
    do          
	if [[ ${spec#*[+-=]} != [rwxst]## ]]
	then              
	    _files && ret=0 
	    return ret                     
	fi 
	specs+=(${${(M)spec##[+-=]*}:+a}$spec)
    done
    _wanted files expl file _files -g "*(-.^f:${(j.,.)specs}:)" && ret=0 

Do you have a case where it's failing?