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The common state is transferred to Lua when calling a custom Lua reader,
and is now also transferred back after the reader has finished. This
ensures that info messages, warnings, and mediabag entries are available
to the main program and all subsequent processing steps.
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The module has grown unwieldy and is therefore split into three internal
Haskell modules, `Init`, `Module`, and `Run`.
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The CommonState (`PANDOC_STATE` in Lua) may change between the time that
a custom writer script is first loaded and when the writer is run.
However, the writer was always using the initial state, which led to
problems, e.g. when the mediabag was updated in a filter, as those
updates where not visible to the writer.
The state is now updated right before the writer function runs.
Fixes: #9229
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The value did not hold the actual file path for scripts in the *custom*
folder of the datadir.
Fixes: #8781
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The new type CustomComponents is exported from T.P.Scripting, and the
ScriptEngine fields are changed. Instead of separate fields for custom
readers and writers, we now have a single function that loads any number
of "components" from a script: these may be custom readers, custom
writers, templates for writers, or extension configs. (Note: it's
possible to have a custom reader and a custom writer for a format
together in the same file.)
Pandoc now checks the folder `custom` in the user's data directory for a
matching script if it can't find one in the local directory. Previously,
the `readers` and `writers` data directories were search for custom
readers and writers, respectively. Scripts in those directories must be
moved to the `custom` folder.
Custom readers used to implement a fallback behavior that allowed to
consume just a string value as input to the `Reader` function. This has
been removed, the first argument is now always a list of sources. Use
`tostring` on that argument to get a string.
Closes #8417.
Signed-off-by: Albert Krewinkel <[email protected]>
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