Feature request: huge file editing support

  • Hi, I am a programmer and use NP++ as my favorite editor.

    I often need to view, and sometimes transform, huge files (e.g. logs or auto-generated scripts with several millions lines). I think it would be very useful if NP++ could be optimized in order to allow viewing, editing, and processing of files of any size.

    I would suggest a “straming-like” loading mode for huge files. In such mode, NP++ wouldn’t load the file content entirely, but only a chunk of lines where the viewer (or the working processor) is currently located at.

    Modifications could be saved in temporary chunked backup files, which are then merged onto the entire stream by a background worker thread.

    This is a limited mode, thus non-scalable functionalities (e.g. select all) may be disabled.

    Maybe some plugins won’t currently work whithin this mode (e.g. those that require the entire file contents loaded, such as document map), but I think many could be reimplemented for achieving the same functionality (e.g. compare, find/replace).

    Thank you very much, I hope my suggestion could be useful to you.

  • There has been discussions about large file support and also a few people working on a 64bit version that should be able to handle large files.

  • @milipili I agree, it is just a nice first step. FYI Scintilla v3.6.0 has better 64-bit support

  • Alberto,

    I wonder how big your files are in bytes, and what software you use currently to edit your files.

    Doing what you suggest with files containing chunks of text wouldn’t even need 64 bits - I think that is a bit of a distraction.

    However I would have thought that the resultant editor would be so different from NP++ - both in functionality and internal code - that it might be simpler to start again and write a specialised C program. I would certainly take this approach if I had your problem.

    For example, such a program might keep an index of the location of every 5000’th line (say) that would remain available at the end of the edit for re-use. This would let you zoom to a specific line at high speed.

    Judging by all the powerful features of NP++, I imagine the software must pass through the memory image of the file quite regularly - e.g. for highlighting - and every one of those scans is going to be horribly slow on a multi-GB file.


  • I agree that a 64-bit exe isn’t required but is probably the soonest-to-be-implemented option. There are programs (that I use frequently) that do exact what was described, just load up chunks of the file at a time to search/edit. N++ would need alot of underlying changes to operate this way (which I guess is technically possible) but you’d loose alot of the functionality that makes N++ something more powerful than plain old notepad.

  • Actually a 64bits version of n++ is not an objective in the short term

    I don’t know why, because the current code compiles and works well on x64.

    Using UTF-16 internally

    Is this a requirement for Windows-based GUI? Because, otherwise, UTF-8 is the way to go.

  • To confirm, the current 32bit version will download and run well on a Windows 64bit system, correct?? Thanks.

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