removes leading \n characters from written files

This commit adds a recursive function to strip newline chars
from files which start with leading \n characters, or contain \n
chars after their shebang

Author: Cdok

copyright/copyright.js

@@ -62,6 +62,19 @@ const buildSupportedExtensions = () => {
         })
 }
 
+/**
+ * Removes extra \n characters from the top of any files
+ * to ensure more consistent spacing between copyright headers
+ * @param  {String} content original file to edit
+ * @return {String}         new file with no leading \n
+ */
+const removeLeadingNewlines = (content) => {
+    if (content[0] === '') {
+        content.shift()
+        removeLeadingNewlines(content)
+    }
+    return content
+}
 
 if (args.length === 0 || args.indexOf('--help') >= 0) {
 
@@ -125,10 +138,13 @@ args
                 // accomodate for shebang and insert before header
                 if (contentStr[0].indexOf('#!') >= 0) {
                     const shebang = contentStr.shift()
-                    contentStr = contentStr.join('\n')
+                    debugger
+                    contentStr = removeLeadingNewlines(contentStr).join('\n')
                     newData = shebang + '\n' + getHeaderText(ext) + '\n' + contentStr // eslint-disable-line prefer-template
                 } else {
-                    newData = getHeaderText(ext) + `\n${content}`  // eslint-disable-line prefer-template
+                    debugger
+                    contentStr = removeLeadingNewlines(contentStr).join('\n')
+                    newData = getHeaderText(ext) + `\n${contentStr}`  // eslint-disable-line prefer-template
                 }
 
                 fs.writeFileSync(file, newData)