So on my laptop the other day, I noticed Yi had spiked to 60% of my RAM (512MB machine), which perplexed me as I was only doing some IReader stuff and each text is no more than a book (1MB?) and usually less.
A little thought and I decided that this must be due to the undo history, since I could undo each update, and if the text of each and every book I was going through was being held... While it's fine to have undo within each text, I don't want undos from update to update and especially not if it means horrific memory usage; thus, my 'setDisplayedArticle' (which calls 'replaceBufferContent' to actually update the buffer) ought to delete the undo history. Grepping and looking at Yi.Buffer.Misc, it seems that the undo history is probably being stored as 'undos :: !URList' in the Attributes type. The whole system is something of a mystery to me, but looking at the code C-/ is bound to, I think the way to update the undo list is to modify the little BufferM do expression in setDisplayedArticle to call 'putA undosA emptyU' at the end? eg. hunk ./src/Yi/IReader.hs 19 -import Yi.Buffer.Misc (bufferDynamicValueA, BufferM) +import Yi.Buffer.Misc -- (bufferDynamicValueA, BufferM) hunk ./src/Yi/IReader.hs 25 +import Yi.Buffer.Undo hunk ./src/Yi/IReader.hs 93 + -- erase undo history + putA undosA emptyU (I'd test this myself, but I can't seem to compile yi because the Template Haskell errors out with 'Loading package gtk-0.10.0 ... <command line>: can't load .so/.DLL for: gdk_pixbuf-2.0 (libgdk_pixbuf-2.0.so: cannot open shared object file: No such file or directory)', and there apparently *is* no -dev package for pixbuf2 in Ubuntu; even more confusingly, I do have a /usr/lib/libgdk_pixbuf-2.0.so.0, a /usr/lib/libgdk_pixbuf.so, and a /usr/lib/libgdk_pixbuf.so.2.0.0 among others. I guess they're not right.) -- gwern
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