[gogo] automatic expansion of $args in Closure stops direct access to $args list
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Key: FELIX-1493
URL: https://issues.apache.org/jira/browse/FELIX-1493
Project: Felix
Issue Type: Bug
Components: Gogo
Reporter: Derek Baum
individual arguments to Closures can be accessed as $0, $1, $2
all arguments can be accessed as the List $args.
> x = { echo hello $args }
> x a b
used to produce:
hello [a b]
because the $args List was passed directly as a single argument to echo.
This is not desirable in most cases, so the parser was changed to expand $args
in Closures by expanding the $args List,
thus producing:
hello a b
Unfortunately, this also broke the ability for a closure to access the $args
list directly:
% loop = { each $args { echo arg is $it }}
% loop a b
IllegalArgumentException: Cannot coerce each[1, 2, 3,
org.apache.felix.gogo.runtime.shell.clos...@b1deea] to any of [(CommandSession,
Collection, Function)]
A simple fix would be to introduce an alternative Closure variable name e.g.
argv that is NOT expanded, but remains as a list:
% loop = { each $argv { echo arg is $it }}
% loop a b
arg is a
arg is b
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