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Yahoo! search interface: Difference between revisions
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The following gives us a shell utility which we can invoke with arguments like "rosetta 0" to get the first page of search results for "rosetta".
The two arguments are handled as if they were two lines of text from a data source using @(next :args). We throw an exception if there is no match (insufficient arguments are supplied). The @(cases) directive has strictly ordered evaluation, so the throw in the second branch does not happen if the first branch has a successful pattern match. If the similar @(maybe) or @(some) directives were used, this wouldn't work.
A little sprinkling of regex is used.
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