Merge pull request #23 from erizocosmico/fix/get-first-line

data: fix getting the first line for empty content

data/generated.go

@@ -188,7 +188,11 @@ func isSourceMap(path, _ string, content []byte) bool {
  return true
  }
 
- firstLine := getLines(content, 1)[0]
+ firstLine := getFirstLine(content)
+ if len(firstLine) == 0 {
+ return false
+ }
+
  for _, r := range sourceMapRegexps {
  if r.Match(firstLine) {
  return true
@@ -203,7 +207,7 @@ func isCompiledCoffeeScript(path, ext string, content []byte) bool {
  return false
  }
 
- firstLine := getLines(content, 1)[0]
+ firstLine := getFirstLine(content)
  lastLines := getLines(content, -2)
 
  if string(firstLine) == "(function() {" &&
@@ -753,6 +757,14 @@ func isGeneratedJooq(_, ext string, content []byte) bool {
  return false
 }
 
+func getFirstLine(content []byte) []byte {
+ lines := getLines(content, 1)
+ if len(lines) > 0 {
+ return lines[0]
+ }
+ return nil
+}
+
 // getLines returns up to the first n lines. A negative index will return up to
 // the last n lines in reverse order.
 func getLines(content []byte, n int) [][]byte {

data/generated_test.go

@@ -8,6 +8,10 @@ import (
  "github.com/stretchr/testify/require"
 )
 
+func TestGetFirstLineEmptyContent(t *testing.T) {
+ require.Nil(t, getFirstLine(nil))
+}
+
 func TestForEachLine(t *testing.T) {
  const sample = "foo\nbar\nboomboom\nbleepbloop\n"
  var lines = strings.Split(sample, "\n")