initial commit

nvim/lua/astronvim/utils/ffi.lua

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+-- ### AstroNvim C Extensions
+
+local ffi = require "ffi"
+
+-- Custom C extension to get direct fold information from Neovim
+ffi.cdef [[
+	typedef struct {} Error;
+	typedef struct {} win_T;
+	typedef struct {
+		int start;  // line number where deepest fold starts
+		int level;  // fold level, when zero other fields are N/A
+		int llevel; // lowest level that starts in v:lnum
+		int lines;  // number of lines from v:lnum to end of closed fold
+	} foldinfo_T;
+	foldinfo_T fold_info(win_T* wp, int lnum);
+	win_T *find_window_by_handle(int Window, Error *err);
+	int compute_foldcolumn(win_T *wp, int col);
+]]
+
+return ffi