1 files changed, 63 insertions, 0 deletions
diff --git a/lib/modifiers/summary/insertArticle.js b/lib/modifiers/summary/insertArticle.js
new file mode 100644
index 0000000..ae920c2
--- /dev/null
+++ b/lib/modifiers/summary/insertArticle.js
@@ -0,0 +1,63 @@
+var is = require('is');
+var SummaryArticle = require('../../models/summaryArticle');
+var editArticle = require('./editArticle');
+var indexArticleLevels = require('./indexArticleLevels');
+
+
+/**
+    Get level of parent of an article
+
+    @param {String} level
+    @return {String}
+*/
+function getParentLevel(level) {
+    var parts = level.split('.');
+    return parts.slice(0, -1).join('.');
+}
+
+/**
+    Insert an article in a summary at a specific position
+
+    @param {Summary} summary
+    @param {String|Article} level: level to insert after
+    @param {Article} article
+    @return {Summary}
+*/
+function insertArticle(summary, level, article) {
+    article = SummaryArticle(article);
+    level = is.string(level)? level : level.getLevel();
+
+    var parentLevel = getParentLevel(level);
+
+    if (!parentLevel) {
+        // todo: insert new part
+        return summary;
+    }
+
+    // Get parent of the position
+    var parentArticle = summary.getByLevel(parentLevel);
+    if (!parentLevel) {
+        return summary;
+    }
+
+    // Find the index to insert at
+    var articles = parentArticle.getArticles();
+    var index = articles.findIndex(function(art) {
+        return art.getLevel() === level;
+    });
+    if (!index) {
+        return summary;
+    }
+
+    // Insert the article at the right index
+    articles = articles.insert(index, article);
+
+    // Reindex the level from here
+    parentArticle = parentArticle.set('articles', articles);
+    parentArticle = indexArticleLevels(parentArticle);
+
+    return editArticle(summary, parentLevel, parentArticle);
+
+}
+
+module.exports = insertArticle;