optioninfo.so

optioninfo.so

[Tanaka Akira]

Hi.  I made simple shared library for extracting information of
options by overrinding getopt_long.

Z(4):akr@serein% make
gmake: `optioninfo.so' is up to date.
Z(4):akr@serein% _ls_arguments=($(LD_PRELOAD=$PWD/optioninfo.so ls))
Z(4):akr@serein% _ls () { _arguments $_ls_arguments '*:file: _files' }
Z(4):akr@serein% compdef _ls ls                                       
Z(4):akr@serein% ls -<TAB>
option
--all           --hide-control-chars   --reverse              -D   -a   -o 
--almost-all    --human-readable       --show-control-chars   -F   -b   -p 
--block-size    --ignore               --si                   -G   -c   -q 
--classify      --ignore-backups       --size                 -H   -d   -r 
--color         --indicator-style      --sort                 -I   -e   -s 
--dereference   --inode                --tabsize              -L   -f   -t 
--directory     --kilobytes            --time                 -N   -g   -u 
--dired         --literal              --version              -Q   -h   -v 
--escape        --no-group             --width                -R   -i   -w 
--file-type     --numeric-uid-gid      -1                     -S   -k   -x 
--format        --quote-name           -A                     -T   -l      
--full-time     --quoting-style        -B                     -U   -m      
--help          --recursive            -C                     -X   -n      
Z(4):akr@serein% uname -a
Linux serein.m17n.org 2.2.14-5k4 #1 Sun Mar 12 15:33:30 PST 2000 i686 unknown

Although this is not so sophisticated now and it is not portable, it
is very useful in some case.  How about this?

begin 644 optioninfo.tar.gz
M'XL("$AM]3@"`V]P=&EO;FEN9F\N=&%R`.V6VT[;0!"&?9M]BA$'Q2$.V`YQ
MI*2A4$HK*DI::*\HBMR-G5@$;V2O.:CBW;L;V_&A):$JC8HTWXWCF=E9[S\S
MCMF4>\SW?)?M?+2O'->;.,ISHQNZ;NWN*KK>:EGM9NX:8YJ6HK?U=LNT6I8A
M?AM-W6HKH"LK(`JY'0`H]E6P,&Z9_X5R?G9X#CU@\S;8IJ3_YD/)Q@@Y?'=R
M\%Z:&^[4HX3DO"'KP(8J5]5(93*$1CBV`T=<&6SLIQX@9.1PL6I;1">_**E0
M&B>$!LVL1$%61%;&G7P/K'+^FRV]F9O_MIS_MF7@_*^"=<^GDVCHP*N0#SVV
M/=XCF2D92&$CZT/QW^`[T/_TY;A_.CCMGQY5]++U[.CSU^.SH[<5H^R)+P<G
M%9,0(3@7`W_#O"&$8Q;P0=QY*@'P?)Z\=[3DCM]/G1KY(>ZF@;AWU;7&)EW3
MDJA:5SC"6X_3,:BS4)"AU`X+C]H1-H#O@6-?=4G)GSYT'.-.(QZJ:QT[&$77
MCL\[8BNA#(OX;*O'DJ3G*R1I/);E09XF$L]L!VKUFU\5QH>B+A/FCW*R4.:'
M'&0\;"V5I[$9_G-]>L\B4._/!(H[AMJ^5";DXKRCWX@3.V)-;L?B>T;-66>G
M%\JYH,Z-%\8E]'I0[51K,V?9;<[=R6I)H7&S#;3R><635^9>J/>@V4UR/"17
M9R)4>GKBM!R_)#:+B65:LC!EO:[E>R`17N@L^RH>_70D19FH[+A8Y%AP8;NY
MN-06%Z!4K<PK-W/N/*[JY=K*UI=Q66G%DHBF[P782@/B'5P6@-J%U-C8\^UK
M)[NOU].JY4>J&*TE.F76L1T.Q/EDW75XG5<).HN"C2PXK=/B!6:V(.V8^8(E
MM9D)]1<%TI;IF[YB9@;/'SIW3ZAIL83S4I7+73K&@/F3^Y=Z%OR(1!`$01`$
901`$01`$01`$01`$0?X;?@+UR43>`"@`````
`
end
-- 
Tanaka Akira

RE: optioninfo.so

[Andrej Borsenkow]

> Z(4):akr@serein% _ls_arguments=($(LD_PRELOAD=$PWD/optioninfo.so ls))
                                    ^^^^^^^^^^ argh!
>
> Although this is not so sophisticated now and it is not portable, it
> is very useful in some case.  How about this?
>

Yes, it is not very portable. Do you suggest to use it outside of Zsh?
Or in Zsh completion? If it can be made Zsh module - why not. But
please, no PRELOAD fiddling.

-andrej

Re: optioninfo.so

[Tanaka Akira]

In article <000601bfa516$701681d0$21c9ca95@mow.siemens.ru>,
  "Andrej Borsenkow" <Andrej.Borsenkow@mow.siemens.ru> writes:

> Yes, it is not very portable. Do you suggest to use it outside of Zsh?
> Or in Zsh completion? If it can be made Zsh module - why not. But
> please, no PRELOAD fiddling.

Zsh completion system should work without LD_PRELOAD.  But is there a
reason that the system automatically detect LD_PRELOAD and use it only
when it is working?  Of couse, if there is no way to detect that, it
should be disabled by default.

Writing a completion function which supports various versions of a
command is very difficult.  (See _patch, _telnet, _finger, _make,
etc.)  So I think it is useful even if it is not work on every
environment.

Also, it may be useful for writing template of completion functions if
a completion function writer can use LD_PRELOAD. :-)
-- 
Tanaka Akira

Re: optioninfo.so

[Oliver Kiddle]

Andrej Borsenkow wrote:
> 
> > Z(4):akr@serein% _ls_arguments=($(LD_PRELOAD=$PWD/optioninfo.so ls))
>                                     ^^^^^^^^^^ argh!
> >
> > Although this is not so sophisticated now and it is not portable, it
> > is very useful in some case.  How about this?

> Yes, it is not very portable. Do you suggest to use it outside of Zsh?
> Or in Zsh completion? If it can be made Zsh module - why not. But
> please, no PRELOAD fiddling.

I think it is a very nice idea and with a bit of thought and effort, we
should be able to make good use of it for the completion system. I don't
have a problem with PRELOAD fiddling.

The principle of pre-loading works on a number of platforms but I think
the specifics of it vary. On IRIX, it is something like _RLD_LIST, I
have the exact details somewhere. Where is the real getopt_long going to
be on non-Linux systems? Is it staticly compiled into and GNU binaries
and if so, will preloading still work?

What we will probably need to do is use a wrapper script around this. It
could take the same arguments as _arguments. Where we can't use
preloading, it could just pass everything straight through to
_arguments. Otherwise it would have to take the options from
optioninfo.so and merge them with the arguments we passed. This would
allow us to get at any descriptions. We would also need to account for
programs which use getopt_long but don't have a specific completion.
Another consideration is that the programs will need to be called in a
safe way so some might need a --help option.

Oliver