Hi Herve,
Cheers for the pointer, I'd forgotten about switches.
I figured I'd use this opportunity to plug my own CLI2 proposal a little more so
here's how I see switches slotting in:
A SwitchBuilder would be created to deal with a specific pair of enable / disable
prefixes:
SwitchBuilder sBuilder = new SwitchBuilder("+","-");
Then a SwitchOption would be created with a particular name:
SwitchOption scrollbar = sBuilder.withName("sb").create();
The getPrefixes() for SwitchOption would return [+sb,-sb] and the CommandLine object
would probably gain a method along the
following lines; returning TRUE iff the enabled version was present, FALSE iff the
disabled version was present or null otherwise:
Boolean getSwitch(SwitchOption)
(And an associated setSwitch(SwitchOption,Boolean) method)
Separating the prefixes allows us to use the same code to handle ./configure style
options such as "--enable-FEATURE" and
"--disable-FEATURE" simply by supplying "--enable" and "--disable" instead of "+" and
"-".
If we make the SwitchOption extend ParentOption then we can even compose one with an
Argument as follows:
// build the switch
SwitchOption sslSwitch = new
SwitchBuilder("--with-","--without-").withName("ssl").create();
// wrap in an argument
Argument sslArgument = new
ArgumentBuilder().withName("DIR").withChild(sslSwitch).create();
...
// deal with ssl
if(commandLine.getOption("--with-ssl")==Boolean.TRUE){
sslDir = findSsl(commandLine.getValues("--with-ssl"));
}
Thus the complex ./configure style options such as "--with-ssl=/usr/share/ssl" /
"--without-ssl" would be supported out of the box.
The implementation should be pretty straight forward - new classes SwitchOption &
SwitchBuilder, some addition to CommandLine and
lots of tests. IMO, minimal impact for a handy new feature.
Rob
----- Original Message -----
From: "Herve Quiroz" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, July 01, 2003 3:19 PM
Subject: [CLI] Switches ?
> Hi,
>
>
> As you are still in design stage for CLI 2.0, I thought I might just
> submit another feature that is used by command line parsers for some apps:
> switches.
>
> In CLI, the PREFIX for a command-line option is '-' but may be overriden
> to become anything else. Some apps have several different prefixes to
> manage switches. When you consider xterm for example, you get two flavors
> for the same option, one that "enable" it (with -option) and one that
> "disable" it (with +option). For instance,
>
> '-sb' means you want the scrollbar
> '+sb' means you don't want it
>
> Personally, I wouldn't use such a scheme to parse command line arguments
> so I won't need it in a future version of CLI (BTW I find the next version
> quite interesting). Thus, I am not requesting a new feature from CLI here.
> Anyway, you might want to decide now if you plan to support such a feature
> in the near future now that you are defining the API...
>
> Regards,
>
> Herve
>
>
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