make this build with nix-build

Signed-off-by: Christine Dodrill <me@christine.website>

book/default.nix

@@ -1,6 +1,6 @@
+{ pkgs ? import <nixpkgs> { } }:
+
 let
-  sources = import ../nix/sources.nix;
-  pkgs = import sources.nixpkgs { };
   nur = import (builtins.fetchTarball
     "https://github.com/nix-community/NUR/archive/master.tar.gz") {
       inherit pkgs;
@@ -8,39 +8,33 @@ let
   tex = pkgs.callPackage ../nix/texlive.nix { };
   version = "devel";
   words = import ../words;
-  book = pkgs.stdenv.mkDerivation {
-    pname = "lewa-book";
-    inherit version;
-    src = ./.;
-    phases = "buildPhase installPhase";
-    buildInputs = with pkgs; [
-      kindlegen
-      mdbook
-      nur.repos.mic92.pandoc-bin
-      tex
-      words
-    ];
+in pkgs.stdenv.mkDerivation {
+  pname = "lewa-book";
+  inherit version;
+  src = ./.;
+  phases = "buildPhase installPhase";
+  buildInputs = with pkgs; [
+    calibre
+    mdbook
+    nur.repos.mic92.pandoc-bin
+    tex
+    words
+  ];
 
-    buildPhase = ''
-      cp -rf $src/src .
-      chmod a+w ./src
-      cp -rf $src/book.toml .
-      mkdir book
-      rm ./src/dictionary.md ||:
-      cp ${words}/dictionary.md ./src/dictionary.md
-      mdbook build
-      cd ./src && ./build.sh && cd ..
-      cd ./book && kindlegen lewa.epub ||: && cd ..
-    '';
+  buildPhase = ''
+    cp -rf $src/src .
+    chmod a+w ./src
+    cp -rf $src/book.toml .
+    mkdir book
+    rm ./src/dictionary.md ||:
+    cp ${words}/dictionary.md ./src/dictionary.md
+    mdbook build
+    cd ./src && ./build.sh && cd ..
+    cd ./book && ebook-convert lewa.epub lewa.mobi ||: && cd ..
+  '';
 
-    installPhase = ''
-      mkdir -p $out
-      cp -rf book $out/book
-    '';
-  };
-in pkgs.dockerTools.buildLayeredImage {
-  name = "within/lewa-book";
-  tag = version;
-  contents = [ nur.repos.xe.quickserv book ];
-  config.Cmd = [ "/bin/quickserv" "--port=9001" "--dir=/book" ];
+  installPhase = ''
+    mkdir -p $out
+    cp -rf book $out/book
+  '';
 }

book/src/07_prepositions/index.md

@@ -0,0 +1,5 @@
+# Prepositions
+
+In English, prepositions are function words such as "to", "from", "like", and
+similar. This chapter will cover the L'ewa prepositions and how they are used to
+add more context to sentences.

default.nix

@@ -0,0 +1,3 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+pkgs.callPackage ./book { }