Brian Gesiak a80ee75318 [Option] Add 'findNearest' method to catch typos ... Summary: Add a method `OptTable::findNearest`, which allows users of OptTable to check user input for misspelled options. In addition, have llvm-mt check for misspelled options. For example, if a user invokes `llvm-mt /oyt:foo`, the error message will indicate that while an option named `/oyt:` does not exist, `/out:` does. The method ports the functionality of the `LookupNearestOption` method from LLVM CommandLine to libLLVMOption. This allows tools like Clang and Swift, which do not use CommandLine, to use this functionality to suggest similarly spelled options. As room for future improvement, the new method as-is cannot yet properly suggest nearby "joined" options -- that is, for an option string "-FozBar", where "-Foo" is the correct option name and "Bar" is the value being passed along with the misspelled option, this method will calculate an edit distance of 4, by deleting "Bar" and changing "z" to "o". It should instead calculate an edit distance of just 1, by changing "z" to "o" and recognizing "Bar" as a value. This commit includes a disabled test that expresses this limitation. Test Plan: `check-llvm` Reviewers: yamaguchi, v.g.vassilev, teemperor, ruiu, jroelofs Reviewed By: jroelofs Subscribers: jroelofs, llvm-commits Differential Revision: https://reviews.llvm.org/D41732 llvm-svn: 321877		2018-01-05 17:10:39 +00:00
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CMakeLists.txt
llvm-mt.cpp	[Option] Add 'findNearest' method to catch typos	2018-01-05 17:10:39 +00:00
LLVMBuild.txt
Opts.td