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https://issues.apache.org/jira/browse/IVY-480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12491722
]
Archie Cobbs commented on IVY-480:
----------------------------------
The "--" option terminates option processing.
Example: compile this program:
{noformat}
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.OptionBuilder;
import org.apache.commons.cli.Options;
class xx {
private static Options getOptions() {
Option conf = OptionBuilder.withArgName( "conf" )
.hasArg()
.withDescription( "specify configuration" )
.create( "conf" );
Options options = new Options();
options.addOption(conf);
return options;
}
public static void main(String[] args) throws Exception {
Options options = getOptions();
GnuParser parser = new GnuParser();
CommandLine line = parser.parse( options, args );
String[] extra = line.getArgs();
System.out.println("there are " + extra.length + " extra args:");
for (int i = 0; i < extra.length; i++)
System.out.println("["+i+"] = \"" + extra[i] + "\"");
}
}
{noformat}
Now run it:
{noformat}
$ java xx -conf asdf -- foo -conf bar
there are 3 extra args:
[0] = "foo"
[1] = "-conf"
[2] = "bar"
{noformat}
> Allow "main" parameters to be passed directly (instead of using -args flag)
> ---------------------------------------------------------------------------
>
> Key: IVY-480
> URL: https://issues.apache.org/jira/browse/IVY-480
> Project: Ivy
> Issue Type: Improvement
> Components: Core
> Affects Versions: 1.4.1
> Reporter: Archie Cobbs
> Attachments: argspatch.txt
>
>
> When running ivy in standalone mode using the {{-main}} flag, any extra
> parameters passed on the command line (i.e., not as flag arguments) are
> simply ignored.
> E.g., if I invoke {{java fr.jayasoft.ivy.Main -main com.exmaple.Main foo
> bar}} the {{foo bar}} parameters are ignored. To pass "foo" and "bar" to my
> main method, I have to use {{-args foo}} and {{-args bar}}.
> Suggestion: when using the {{-main}} flag, allow the parameters to the main
> method to be passed directly on the command line as "extra" parameters, as an
> alternative to using the {{-args}} flag.
> The motivation for this is that this would be much easier to deal with in
> shell scripts. E.g. suppose I want to write a shell script {{/usr/bin/foo}}
> which uses ivy to resolve dependencies and execute some main class
> {{com.example.foo.Main}}. To do this I'd have to parse the command line into
> individual arguments, then precatenate each one with a {{-args}} flag, etc.
> This sounds hard enough, but when you consider that some parameters may be
> quoted, it becomes nearly impossible. With the change suggested here, it
> would become trivial: I'd just do something like {{ivy -ivy
> /usr/share/foo.ivy -main com.example.foo.Main ${1+"$@"} }} in the shell
> script.
> If this is implemented, it should probably become the recommended approach,
> and {{-args}} be deprecated.
> As a side note, the {{-args}} flag is mis-named: it should be called {{-arg}}
> instead (but I'd prefer to have it just be deprecated).
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