fen

Parse a Forsyth–Edwards Notation (FEN) string

Validates most of the components and produces either a terminal or graphical representation of the board

Examples

Parse and validate a FEN string, producing a terminal representation of the board

cargo -q run -- "r1b1k2r/2qnbppp/p2ppn2/1p4B1/3NPPP1/2N2Q2/PPP4P/2KR1B1R w kq b6 0 11"

Add information regarding whose turn it is, castling, en-passant

cargo -q run -- "r1b1k2r/2qnbppp/p2ppn2/1p4B1/3NPPP1/2N2Q2/PPP4P/2KR1B1R w kq b6 0 11" -i

Validation should catch errors such as incorrect castling rights

cargo -q run -- "r1b1k2r/2qnbppp/p2ppn2/1p4B1/3NPPP1/2N2Q2/PPP4P/2KR1B1R w kqX b6 0 11" -i

and incorrect turn notation

cargo -q run -- "r1b1k2r/2qnbppp/p2ppn2/1p4B1/3NPPP1/2N2Q2/PPP4P/2KR1B1R x kq b6 0 11" -i

In addition to the terminal view, a graphical window view can be created using the -w flag

cargo -q run -- "r1b1k2r/2qnbppp/p2ppn2/1p4B1/3NPPP1/2N2Q2/PPP4P/2KR1B1R w kq b6 0 11" -i -w

Known Issues

• Because of the way that piston loads the font as a GlyphCache referring to a font file, this crate can only be run from within the top-level fen/ directory (as assets/ is relative). A workaround for this, to enable site-wide installation, would be most welcome.

• This does not detect illegal positions, it merely parses the FEN as given.