diff --git a/.gitignore b/.gitignore
index e2f5dd2..0b62354 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,5 @@
-result
\ No newline at end of file
+result
+*.epub
+*.mobi
+*.pdf
+.redo
diff --git a/all.do b/all.do
new file mode 100644
index 0000000..53ed412
--- /dev/null
+++ b/all.do
@@ -0,0 +1,2 @@
+redo-ifchange Spellblade.mobi
+redo-ifchange wordcount
\ No newline at end of file
diff --git a/default.epub.do b/default.epub.do
new file mode 100644
index 0000000..425a60c
--- /dev/null
+++ b/default.epub.do
@@ -0,0 +1,11 @@
+DEPS="$(ls ./src/**/*.md | grep -v plans)"
+
+redo-ifchange $DEPS ./src/style.css ./src/pagebreak.lua ./src/title.txt
+
+pandoc \
+    -o $3 \
+    --resource-path=./src \
+    --css ./src/style.css \
+    --lua-filter ./src/pagebreak.lua \
+    --to epub \
+    ./src/title.txt $DEPS
\ No newline at end of file
diff --git a/default.mobi.do b/default.mobi.do
new file mode 100644
index 0000000..12c4bcc
--- /dev/null
+++ b/default.mobi.do
@@ -0,0 +1,5 @@
+exec >&2
+
+redo-ifchange ./out/$2.epub
+
+ebook-convert ./out/$2.epub ./out/$2.mobi
\ No newline at end of file
diff --git a/default.nix b/default.nix
index 59e4e32..37b1826 100644
--- a/default.nix
+++ b/default.nix
@@ -14,12 +14,14 @@ in pkgs.stdenv.mkDerivation {
   buildInputs = with pkgs; [
     calibre
     nur.repos.mic92.pandoc-bin
+    redo-apenwarr
   ];
 
   buildPhase = ''
     cp -rf $src/src .
-    mkdir out
-    cd ./src && ./build.sh && cd ..
+    cp -rf $src/*.do .
+    mkdir -p out
+    redo
   '';
 
   installPhase = ''
diff --git a/shell.nix b/shell.nix
index eb9f4fe..8c0c4f0 100644
--- a/shell.nix
+++ b/shell.nix
@@ -9,6 +9,7 @@ in pkgs.mkShell {
   buildInputs = with pkgs; [
     calibre
     nur.repos.mic92.pandoc-bin
+    redo-apenwarr
 
     # keep this line if you use bash
     bashInteractive
diff --git a/src/build.sh b/src/build.sh
deleted file mode 100755
index 1a649b3..0000000
--- a/src/build.sh
+++ /dev/null
@@ -1,18 +0,0 @@
-#!/usr/bin/env bash
-set -e
-
-[[ $DEBUG ]] && set -x
-
-FILES="$(ls ./**/*.md | grep -v plans)"
-
-echo $FILES
-
-pandoc \
-    -o ../out/Spellblade.epub \
-    --resource-path=. \
-    --css style.css \
-    --lua-filter ./pagebreak.lua \
-    title.txt $FILES
-ebook-convert ../out/Spellblade.epub ../out/Spellblade.mobi
-
-pandoc --lua-filter wordcount.lua $FILES
diff --git a/src/chapter-1/scene-2.md b/src/chapter-1/scene-2.md
index e69de29..2740c3a 100644
--- a/src/chapter-1/scene-2.md
+++ b/src/chapter-1/scene-2.md
@@ -0,0 +1 @@
+\pagebreak
diff --git a/wordcount.do b/wordcount.do
new file mode 100644
index 0000000..152192e
--- /dev/null
+++ b/wordcount.do
@@ -0,0 +1,5 @@
+DEPS="$(ls ./src/**/*.md | grep -v plans)"
+
+redo-ifchange $DEPS ./src/wordcount.lua
+
+pandoc --lua-filter ./src/wordcount.lua $DEPS >&2
\ No newline at end of file