diff --git a/tools/canoninja/cmd/main.go b/tools/canoninja/cmd/main.go
new file mode 100644
index 0000000..71802ef
--- /dev/null
+++ b/tools/canoninja/cmd/main.go
@@ -0,0 +1,36 @@
+package main
+
+/*
+   Canoninja reads a Ninja file and changes the rule names to be the digest of the rule contents.
+   Feed  it to a filter that extracts only build statements, sort them, and you will have a crude
+   but effective tool to find small differences between two Ninja files.
+*/
+
+import (
+	"canoninja"
+	"flag"
+	"fmt"
+	"os"
+)
+
+func main() {
+	flag.Parse()
+	files := flag.Args()
+	if len(files) == 0 {
+		files = []string{"/dev/stdin"}
+	}
+	rc := 0
+	for _, f := range files {
+		if buffer, err := os.ReadFile(f); err == nil {
+			err = canoninja.Generate(f, buffer, os.Stdout)
+			if err != nil {
+				fmt.Fprintln(os.Stderr, err)
+				rc = 1
+			}
+		} else {
+			fmt.Fprintf(os.Stderr, "%s: %s\n", f, err)
+			rc = 1
+		}
+	}
+	os.Exit(rc)
+}