I know nothing of lyx2lyx but have a question that recently came up. Is it common when exporting to older LyX formats to convert some insets to ERT? It seems common, e.g., when adding a feature in a new version of LyX that does not exist in an older version of LyX.
If it is common, from what I understand the current way for lyx2lyx to export to ERT is to essentially rewrite the LaTeX export routine in Python in lyx2lyx. In many cases I imagine this is simple, but I can also imagine that it could be more complicated. In this case, wouldn't it be nice to just ask LyX "hey, can you export this chunk to LaTeX so I can stick it in an ERT box?" I can imagine 2 ways to have lyx2lyx communicate with LyX. One would be to have a command-line argument where we could feed the LyX code to LyX and ask LyX to return the exported LaTeX code corresponding to a specific chunk. An alternative way would be to link lyx2lyx to LyX. For example, pybind11 seems relevant here (https://stackoverflow.com/a/38542539/1376404). Doing this would introduce a huge dependency to the (from what I understand) standalone lyx2lyx. I imagine there are disadvantages to this. By the way, when grepping for ERT in lyx2lyx, I found a comment that was interesting: ERT insert are hidden feature of lyx 1.1.6. This might be removed in the future. I had no idea that ERT was at some point an experimental hidden feature. Interesting! I guess it's hear to stay now. Scott
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