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This was left over from when they were part of an environment.
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It now lives in IO and gives a proper message + exit
instead of calling 'error'.
We shouldn't be making it easier for people to raise error on
pure code. And this is better for the main application
in IO.
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There's already a function addWarning in Parsing!
Maybe we can dispense with that now, but I still like
'warning' better as a name.
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* Renaming Text.Pandoc.Class.warn to addWarning avoids conflict
with Text.Pandoc.Shared.warn.
* Removed writeRTFWithEmbeddedImages from Text.Pandoc.Writers.RTF.
This is no longer needed; we automatically handle embedded images
using the PandocM functions. [API change]
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And use this in pandoc.hs so that messages actually get printed.
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Make it all state. This will make it easier to set things.
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We don't have a good way to set things that aren't in the common
state. That will be the next order of business.
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We'll want these in a number of places, but right now it will be
necessary for the macros in T2T.
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This is to enable macros in T2T, but can be used for other stuff in the
future, I imagine.
This requires building up the info in our fake file trees. Note the
version in IO is safe.
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This will be unified with Text.Pandoc.Error eventually. But I'm building
it out here so as not to interfere with other modules that might be
using the error module currently.
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This was left over from when the pure function was called runTest.
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Right now, the io warnings both print to stderr and write to the
state. That can be easily modified.
We also add a getWarnings function which pulls warnings out of the state
for instances of PandocMonad.
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Errors can be thrown purely with `throwError`. At the moment there are
only three kinds of errors:
1. PandocFileReadError FilePath (for problems reading a file from the
filesystem)
2. PandocShouldNeverHappenError String (for stuff that should never
happen but we need to pattern-match anyway)
3. PandocSomeError String (a grab bag of everything else)
Of course, we need to subdivide the third item in this list.
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This requires a default environment. The state variables are pretty
straightforward. The env variables are a little trickier. I'm just
making most of them empty for now. Note that some of them (like
defaultReferenceDocx/ODT) will be coming out soon anyway.
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Until we fix fetchItem and fetchItem' to make use of MonadError, we have
to thow an exception. We'll throw PandocFileReadError. Note that this is
temporary.
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We're still compiling for 7.8 which is pre-AMP, so let's just be
explicit about it so we can use applicative notation.
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This can be instantiated by both an IO monad or a pure State monad.
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