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avx
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Joined: 21 Jun 2004
Posts: 2152
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 Posted: Mon Jan 23, 2012 7:27 am Post subject: [zsh] help with completion system |
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So I tried to understand the quite lenghty documentation of ZSH's (new) completion system, but I don't quite get it, yet. Thus I'd like to request some help or a link to a page with examples fitting my needs.
Case 1, I've got a function to wake some boxes in the LAN, going something like this | Code: | function wake() {
case ${1} in
"xxx") MAC="..." ;;
"yyy") MAC="..." ;;
*) fail ;;
esac
etherwake -i eth0 ${MAC}
} |
Now, in the old system (compctl), something like this works as intended | Code: | | compctl -k "(xxx yyy)" wake |
Now I'd like to know, how to port this to zstyle.
Case 2, command X should only operate on a given set of files, say images, thus I'd like it to complete only say *.{jpg,png,gif,...}.
Thanks.
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ppurka
Advocate
Joined: 26 Dec 2004
Posts: 3256
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| Posted: Mon Jan 23, 2012 8:25 am Post subject: |
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Case 1: the following should work | Code: | | compdef 'compadd xxx yyy' wake |
Case 2: | Code: | | compdef "_arguments -s ':image files:_files -/g \"*.(jpg|png)\"'" X |
Actually there might be a more direct way using zstyle for this Case 2.
EDIT: Ah. I misread what you wanted. I once used zshwiki to understand some of the completion options. But to really understand them, I had to read some of the examples installed via zsh-completion. Just do equery files zsh-completion and look at the files there. Of course, by now I have forgotten most of what I read, so I had to go on and look at some of the completions I created (3-4yrs ago) to refresh my memory 
EDIT 2: About compadd and _files: http://zsh.sourceforge.net/Guide/zshguide06.html#l182
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mv
Watchman
Joined: 20 Apr 2005
Posts: 6747
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| Posted: Mon Jan 23, 2012 8:35 am Post subject: |
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I found that in almost all cases the _arguments function is enough. For examples how to use it, you might want to look at the zsh-completion files installed by eix (ignore the much more complex _eix). In your first example, you can extend your $fpath array and put the following file in it:
| _wake wrote: | #compdef wake
_arguments : '1:MAC:(xxx yyy)' |
The first ':' to mark the end of options of _arguments is not necessary in this example, but you might in other cases get unexpected effects if you forget it, so better use it as a rule.
If you do not want a separate file, you can of course define it also permanently in an init-file (although I would usually not recommend to do this):
| Code: | _wake() {
_arguments : '1:MAC:(xxx yyy)'
}
comdef _wake wake |
Note that, as unfortunately most features of zsh, the printing of informal texts like "MAC" in this example is switched off by default; you must enable it first with e.g. | Code: | | zstyle ':completion:*' format "%B%F{yellow}%K{blue}%d%k%f%b" |
Your second example is analogous with
| Quote: | | _arguments : '*:picture_file:_files -g "*.(jpg|png|gif)"' |
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avx
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Joined: 21 Jun 2004
Posts: 2152
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| Posted: Mon Jan 23, 2012 12:00 pm Post subject: |
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Thank you, both, that should get me somewhere I hope.
One question, though | Quote: | | you can of course define it also permanently in an init-file (although I would usually not recommend to do this) |
Why not?
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mv
Watchman
Joined: 20 Apr 2005
Posts: 6747
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| Posted: Mon Jan 23, 2012 2:08 pm Post subject: |
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The completion function is then permanently in memory in all your shells (or at least interactive shells, depending where you define it), although you will probably use it only occassionally.
For one short function, this is no issue, of course, but sooner or later you will have much more functions and more complex functions.
This is one of the annoying things in bash that if you save your environment (e.g. for portage), the main bulk you save is the completion system: You can avoid tihs with zsh. |
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avx
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Joined: 21 Jun 2004
Posts: 2152
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| Posted: Mon Jan 30, 2012 3:34 pm Post subject: |
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Thanks, got it working now.
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