Update apply.js

More control over classnames (as described here: marp-team#233). ```js var class = "invert pink embed"; // => "invert pink embed" var class = "invert -pink embed"; // => "invert embed" var class = "invert -pink embed +pink"; // => "invert embed pink" ```
jr-k · Oct 27, 2023 · e044dd1 · e044dd1
1 parent 56d7f44
commit e044dd1
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/src/markdown/directives/apply.js b/src/markdown/directives/apply.js
@@ -73,8 +73,9 @@ function _apply(md, opts = {}) {
           if (marpitDirectives.lang || lang)
             token.attrSet('lang', marpitDirectives.lang || lang)
 
-          if (marpitDirectives.class)
-            token.attrJoin('class', marpitDirectives.class)
+          if (marpitDirectives.class) {
+            token.attrJoin('class', Array.from(marpitDirectives.class.split(' ').reduce((acc, cur) => (cur.startsWith('+') ? acc.add(cur.substring(1)) : cur.startsWith('-') ? acc.delete(cur.substring(1)) : acc.add(cur), acc), new Set())).join(' ');)
+          }
 
           if (marpitDirectives.color) style.set('color', marpitDirectives.color)