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Add codegenfiles module - #447
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codegenfiles reconciles the output of a code generator against a directory: it writes the files whose content changed, leaves the rest alone, deletes output that is no longer generated, and preserves hand-written files that share the directory. Plan reads the filesystem without writing to it, so a tool's generate and verify modes are the same code path and verify cannot corrupt the tree it is checking.
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Cuts the package doc roughly in half. The code block duplicated the runnable Example, and the list of generator output shapes collapsed because writing through an interface of its own and registering a pluggable assembler are the same move. Adds what porting the first consumers turned up. Leaving ContentsMatcher nil is the common case rather than the exception, so FileMatcher is usually the only thing standing between DeleteStale and a hand-written file; a matcher bounded tightly enough that it matches only the generated set leaves DeleteStale unable to fire at all, which is safe but is not working stale-output handling; and capturing a generator's output by pointing it at a scratch directory works only if that output does not depend on where it was written.
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codegenfiles reconciles the output of a code generator against a directory: it writes the files whose content changed, leaves the rest alone, deletes output that is no longer generated, and preserves hand-written files that share the directory. Plan reads the filesystem without writing to it, so a tool's generate and verify modes are the same code path and verify cannot corrupt the tree it is checking.
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