diff --git a/mdbooker.awk b/mdbooker.awk
new file mode 100644
index 0000000..f7f82eb
--- /dev/null
+++ b/mdbooker.awk
@@ -0,0 +1,30 @@
+BEGIN {
+  OUTDIR = "book"
+  SUMMARY = OUTDIR "/SUMMARY.md"
+  printf "" > SUMMARY
+  H = 0
+  Title = ""
+  Content = ""
+}
+
+/^# /    { handleTitle(1); next }
+/^## /   { handleTitle(2); next }
+/^### /  { handleTitle(3); next }
+/^#### / { print "error: ####"; exit 1 }
+{ Content = Content $0 "\n"; next }
+
+function handleTitle(h,   md) {
+  if (Title) {
+    md = Title ".md"
+    print "generating: " md "..."
+    print Content > md
+    printf "%" ((H - 1) * 4) "s%s[%s](%s)\n", "", 1 == H ? "" : "-", Title, md >> SUMMARY
+  }
+  H = h
+  Title = trim(substr($0, h))
+  Content = ""
+}
+
+END { handleTitle(-1) }
+
+function trim(s) { sub(/^[ \t\r\n]+/, "", s); sub(/[ \t\r\n]+$/, "", s); return s }