going to compile

README.md

@@ -3,6 +3,12 @@
 Go by Example book source.
 
 
+### Building Tools
+
+```console
+$ tool/build
+```
+
 ### Numbering
 
 ```console

tool/generate

@@ -1,4 +0,0 @@
-#!/bin/bash
-
-mkdir -p build
-cp style/book.css build/book.css

tool/generate.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+    "os"
+    "os/exec"
+    "fmt"
+)
+
+func check(err error) {
+    if err != nil {
+        panic(err)
+    }
+}
+
+func main() {
+    var err error
+
+    // Accept exactly 1 argument - the input filename.
+    if len(os.Args) != 2 {
+        fmt.Fprintln(os.Stderr, "Usage: tool/generate input.go > output.html")
+        os.Exit(1)
+    }
+
+    // Ensure that we have `markdown` and `pygmentize` binaries.
+    markdownPath, err := exec.LookPath("markdown"); 
+    check(err)
+    pygmentizePath, err := exec.LookPath("pygmentize")
+    check(err)
+    fmt.Println(markdownPath, pygmentizePath)
+}

tool/number

@@ -1,3 +0,0 @@
-#!/bin/bash
-
-exec go run tool/renumber.go