VisiData NWN file format support

This adds support to VisiData for the following Neverwinter Nights: Enhanced Edition file formats:

• Erf (hak, mod, nwm, sav): Browsing and extracting
• KeyBif: Browsing and extracting
• TwoDA: Reading and saving
• Tlk: Reading and saving
• NWSync Manifests: Opening from local disk or HTTP, browsing and extracting. Currently requires giving a explicit filetype:
  • vd -f nwsyncmanifest http://..../manifests/aabbccdd..
  • This may change in the future, depending on if VisiData/http can be taught to guess the filetype based on magic bytes.
• Gff: Transform into flat list and allow browsing (Highly experimental and subject to change)
• Ssf: Reading and saving
• Ncs: Print a simple disassembly

Install

• Requires VisiData (tested against 2.11)
• Requires nim compiler suite installed (tested against 1.6.10)
• Clone this repository into ~/.visidata/plugins/neverwinter
• Build bindings locally (do this every time you update the plugin code):
  • nimble build -d:release
• Install python-side dependencies:
  • pip3 install -r requirements.txt
• Add this line to ~/.visidata/plugins/__init__.py:
  • import plugins.neverwinter

API additions

• neverwinter.decompress(magic, data)
• neverwinter.compress(magic, data)

Misc

TwoDA line numbers

Add this to ~/.visidatarc to make the currently-selected row show up in the bottom right:

options.disp_rstatus_fmt += ' {sheet.cursorRowIndex}'

Decompress nwcompressedbuf columns

When viewing a sqlite DB that has a compressed row, you can decompress it like so:

Press = to add a expr/derived column, and add the following python code:

neverwinter.decompress('RESF', my_column)

Replace my_column with the column to decompress and 'RESF' with the expected magic bytes:

• SQL3: embedded sqlite3 datbases in erf
• RESF: CampaignDB compressed strings/voids.
• NSYC: NWSync compressed file.

Hint: View errors with z^E on the cell that errors out. U to undo.