fixes skygragon#112: use "--" as comment in sql file

Signed-off-by: Eric Wang <skygragon@gmail.com>

Author: skygragon

lib/helper.js

@@ -38,7 +38,7 @@ const LANGS = [
   {lang: 'java',       ext: '.java',       style: 'c'},
   {lang: 'javascript', ext: '.js',         style: 'c'},
   {lang: 'kotlin',     ext: '.kt',         style: 'c'},
-  {lang: 'mysql',      ext: '.sql',        style: '#'},
+  {lang: 'mysql',      ext: '.sql',        style: '--'},
   {lang: 'python',     ext: '.py',         style: '#'},
   {lang: 'python3',    ext: '.py',         style: '#'},
   {lang: 'ruby',       ext: '.rb',         style: '#'},
@@ -131,9 +131,9 @@ h.extToLang = function(fullpath) {
 h.langToCommentStyle = function(lang) {
   const res = LANGS.find(x => x.lang === lang);
 
-  return (res && res.style === '#') ?
-  {start: '#',  line: '#',  end: '#'} :
-  {start: '/*', line: ' *', end: ' */'};
+  return (res && res.style === 'c') ?
+    {start: '/*', line: ' *', end: ' */'} :
+    {start: res.style,  line: res.style,  end: res.style};
 };
 
 h.readStdin = function(cb) {

test/test_helper.js

@@ -159,6 +159,7 @@ describe('helper', function() {
     it('should ok', function() {
       const C_STYLE = {start: '/*', line: ' *', end: ' */'};
       const RUBY_STYLE = {start: '#', line: '#', end: '#'};
+      const SQL_STYLE = {start: '--', line: '--', end: '--'};
 
       assert.deepEqual(h.langToCommentStyle('bash'), RUBY_STYLE);
       assert.deepEqual(h.langToCommentStyle('c'), C_STYLE);
@@ -167,7 +168,7 @@ describe('helper', function() {
       assert.deepEqual(h.langToCommentStyle('golang'), C_STYLE);
       assert.deepEqual(h.langToCommentStyle('java'), C_STYLE);
       assert.deepEqual(h.langToCommentStyle('javascript'), C_STYLE);
-      assert.deepEqual(h.langToCommentStyle('mysql'), RUBY_STYLE);
+      assert.deepEqual(h.langToCommentStyle('mysql'), SQL_STYLE);
       assert.deepEqual(h.langToCommentStyle('python'), RUBY_STYLE);
       assert.deepEqual(h.langToCommentStyle('python3'), RUBY_STYLE);
       assert.deepEqual(h.langToCommentStyle('ruby'), RUBY_STYLE);