Make dashes a switchable typographer category

lib/index.js

@@ -154,7 +154,7 @@ function normalizeLinkText(url) {
  *   replacement](https://github.com/markdown-it/markdown-it/blob/master/lib/rules_core/replacements.js) +
  *   quotes beautification (smartquotes). Or use an Object to enable
  *   specific replacements, like `{rare: true, intellectualProperty:
- *   true, quotes: true}`.
+ *   true, quotes: true, dashes: true}`.
  * - __quotes__ - `“”‘’`, String or Array. Double + single quotes replacement
  *   pairs, when typographer enabled and smartquotes on. For example, you can
  *   use `'«»„“'` for Russian, `'„“‚‘'` for German, and

lib/rules_core/replacements.js

@@ -15,7 +15,9 @@
 // - fractionals 1/2, 1/4, 3/4 -> ½, ¼, ¾
 // - miltiplication 2 x 4 -> 2 × 4
 
-var RARE_RE = /\+-|\.\.|\?\?\?\?|!!!!|,,|--/;
+var RARE_RE = /\+-|\.\.|\?\?\?\?|!!!!|,,/;
+
+var DASHES_RE = /--/;
 
 // Workaround for phantomjs - need regex without /g flag,
 // or root check will fail every second time
@@ -66,7 +68,29 @@ function replace_rare(inlineTokens) {
           // .., ..., ....... -> …
           // but ?..... & !..... -> ?.. & !..
           .replace(/\.{2,}/g, '…').replace(/([?!])…/g, '$1..')
-          .replace(/([?!]){4,}/g, '$1$1$1').replace(/,{2,}/g, ',')
+          .replace(/([?!]){4,}/g, '$1$1$1').replace(/,{2,}/g, ',');
+      }
+    }
+
+    if (token.type === 'link_open' && token.info === 'auto') {
+      inside_autolink--;
+    }
+
+    if (token.type === 'link_close' && token.info === 'auto') {
+      inside_autolink++;
+    }
+  }
+}
+
+function replace_dashes(inlineTokens) {
+  var i, token, inside_autolink = 0;
+
+  for (i = inlineTokens.length - 1; i >= 0; i--) {
+    token = inlineTokens[i];
+
+    if (token.type === 'text' && !inside_autolink) {
+      if (DASHES_RE.test(token.content)) {
+        token.content = token.content
           // em-dash
           .replace(/(^|[^-])---(?=[^-]|$)/mg, '$1\u2014')
           // en-dash
@@ -94,6 +118,7 @@ module.exports = function replace(state) {
   var optionIsObject = typeof typographerOption === 'object';
   var replaceRare = !optionIsObject || typographerOption.rare;
   var replaceIP = !optionIsObject || typographerOption.intellectualProperty;
+  var replaceDashes = !optionIsObject || typographerOption.dashes;
 
   for (blkIdx = state.tokens.length - 1; blkIdx >= 0; blkIdx--) {
 
@@ -103,6 +128,10 @@ module.exports = function replace(state) {
       replace_scoped(state.tokens[blkIdx].children);
     }
 
+    if (replaceDashes && DASHES_RE.test(state.tokens[blkIdx].content)) {
+      replace_dashes(state.tokens[blkIdx].children);
+    }
+
     if (replaceRare && RARE_RE.test(state.tokens[blkIdx].content)) {
       replace_rare(state.tokens[blkIdx].children);
     }

test/misc.js

@@ -364,6 +364,7 @@ describe('typographer switches', function () {
   it('Should support disabling IP symbols', function () {
     var md = markdownit({
       typographer: {
+        dashes: true,
         quotes: true,
         rare: true,
         intellectualProperty: false
@@ -378,6 +379,7 @@ describe('typographer switches', function () {
   it('Should support disabling quote replacements', function () {
     var md = markdownit({
       typographer: {
+        dashes: true,
         quotes: false,
         rare: true,
         intellectualProperty: true
@@ -392,6 +394,7 @@ describe('typographer switches', function () {
   it('Should support disabling rare replacements', function () {
     var md = markdownit({
       typographer: {
+        dashes: true,
         quotes: true,
         rare: false,
         intellectualProperty: true
@@ -403,6 +406,21 @@ describe('typographer switches', function () {
     );
   });
 
+  it('Should support disabling dash replacements', function () {
+    var md = markdownit({
+      typographer: {
+        dashes: false,
+        quotes: true,
+        rare: true,
+        intellectualProperty: true
+      }
+    });
+    assert.strictEqual(
+      md.render('(R) --- it\'s like (c) for trademarks!!!!!!!'),
+      '<p>® --- it’s like © for trademarks!!!</p>\n'
+    );
+  });
+
 });