Add base modifiers for summary as SummaryModifier

1 files changed, 28 insertions, 0 deletions

diff --git a/lib/modifiers/summary/unshiftArticle.js b/lib/modifiers/summary/unshiftArticle.js
new file mode 100644
index 0000000..6bb97c9
--- /dev/null
+++ b/lib/modifiers/summary/unshiftArticle.js
@@ -0,0 +1,28 @@
+var SummaryArticle = require('../../models/summaryArticle');
+var SummaryPart = require('../../models/summaryPart');
+
+var indexLevels = require('./indexLevels');
+
+/**
+    Insert an article at the
+
+    @param {Summary} summary
+    @param {Article} article
+    @return {Summary}
+*/
+function unshiftArticle(summary, article) {
+    article = SummaryArticle(article);
+
+    var parts = summary.getParts();
+    var part = parts.get(0) || SummaryPart();
+
+    var articles = part.getArticles();
+    articles = articles.unshift(article);
+
+    parts = parts.set(0, part);
+    summary = summary.set('parts', parts);
+
+    return indexLevels(summary);
+}
+
+module.exports = unshiftArticle;