setup: filtering of docs files for build

docs/default.nix

@@ -1,6 +1,6 @@
-{ pkgs, mdbook-theme }:
+{ pkgs, crane, mdbook-theme }:
 let
-	inherit (pkgs) stdenv;
+	inherit (pkgs) stdenv lib;
 
 	mdbook-theme-pkg = pkgs.rustPlatform.buildRustPackage {
 		pname = "mdbook-theme";
@@ -9,6 +9,8 @@ let
 		src = mdbook-theme;
 	};
 
+	craneLib = crane.mkLib pkgs;
+
 	tex = pkgs.texlive.combine {
 		inherit (pkgs.texlive) scheme-small standalone qtree pict2e preview;
 	};
@@ -18,9 +20,18 @@ let
 		mdbook mdbook-admonish mdbook-plantuml
 		mdbook-graphviz mdbook-theme-pkg mdbook-linkcheck
 		plantuml graphviz tex poppler_utils];
+
+	docsFileTypes = [ ".*md$" ".*rustemo$" ".*err$" ".*ast$" ".*tex$" ".*png$" ".*css$" ".*js$" ".*sh$"];
+	docsFilter = path: _type: builtins.any (pattern: builtins.match pattern path != null) docsFileTypes;
+	docsOrCargoFilter = path: type:
+		(docsFilter path type) || (craneLib.filterCargoSources path type);
+
 	book = stdenv.mkDerivation {
 		name = "rustemo-book";
-		src = ../.;
+		src = lib.cleanSourceWith {
+			src = ../.;
+			filter = docsOrCargoFilter;
+		};
 		inherit buildInputs;
 
 		buildPhase = ''

flake.nix

@@ -10,7 +10,6 @@
 			};
 		};
 
-
 		crane = {
 			url = "github:ipetkov/crane";
 			inputs.nixpkgs.follows = "nixpkgs";
@@ -32,7 +31,7 @@
 
 				rev = if builtins.hasAttr "rev" self then self.rev else self.dirtyRev;
 				book = import ./docs {
-					inherit pkgs mdbook-theme;
+					inherit pkgs crane mdbook-theme;
 				};
 				rustemo = import ./. {
 					inherit crane pkgs rev;