Add VERBOSE option to tools/build and generate.go

VERBOSE will be set by TRAVIS (but can also be set by user to diagnose slow
builds). Using an env var so that it automatically propagates to all the
sub-scripts and tools without having to pass it through tools/build explicitly.

.travis.yml

@@ -12,4 +12,7 @@ install:
   - go get -u github.com/russross/blackfriday
 
 script:
-  - 'tools/build'
+  - tools/build
+
+env:
+  - VERBOSE=1

tools/build

@@ -2,7 +2,16 @@
 
 set -e
 
+verbose() [[ -v VERBOSE ]]
+
+verbose && echo "Running tests..."
 tools/test
+
+verbose && echo "Formatting code..."
 tools/format
+
+verbose && echo "Measuring line lengths..."
 tools/measure
+
+verbose && echo "Generating HTML..."
 tools/generate

tools/generate.go

@@ -19,6 +19,10 @@ var cacheDir = "/tmp/gobyexample-cache"
 var siteDir = "./public"
 var pygmentizeBin = "./vendor/pygments/pygmentize"
 
+func verbose() bool {
+	return len(os.Getenv("VERBOSE")) > 0
+}
+
 func check(err error) {
 	if err != nil {
 		panic(err)
@@ -221,6 +225,7 @@ func parseAndRenderSegs(sourcePath string) ([]*Seg, string) {
 }
 
 func parseExamples() []*Example {
+	fmt.Println("Parsing examples")
 	exampleNames := readLines("examples.txt")
 	examples := make([]*Example, 0)
 	for _, exampleName := range exampleNames {
@@ -261,6 +266,9 @@ func parseExamples() []*Example {
 }
 
 func renderIndex(examples []*Example) {
+	if verbose() {
+		fmt.Println("Rendering index")
+	}
 	indexTmpl := template.New("index")
 	_, err := indexTmpl.Parse(mustReadFile("templates/index.tmpl"))
 	check(err)
@@ -274,7 +282,10 @@ func renderExamples(examples []*Example) {
 	exampleTmpl := template.New("example")
 	_, err := exampleTmpl.Parse(mustReadFile("templates/example.tmpl"))
 	check(err)
-	for _, example := range examples {
+	for i, example := range examples {
+		if verbose() {
+			fmt.Printf("Rendering %s [%d/%d]\n", example.Name, i, len(examples))
+		}
 		exampleF, err := os.Create(siteDir + "/" + example.ID)
 		check(err)
 		exampleTmpl.Execute(exampleF, example)