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John MacFarlane 848f6b51b2 Text.Pandoc.App: Change parseOptionsFromArgs and parseOptions... (#8406)
They now return `Either OptInfo Opt`.

Add `OptInfo` type.

Add `handleOptInfo` function.  This performs the IO actions for
things like `--version` that were previously done in `parseOptionsFromArgs`.
An argument for a `ScriptingEngine` has been added, to facilitate
printing custom templates and custom extensions for Lua filters.
(However, at this stage nothing is yet done with it.)

[API change]
2022-11-02 19:07:22 -07:00
..