12 files changed, 323 insertions, 0 deletions
diff --git a/lib/modifiers/index.js b/lib/modifiers/index.js
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+++ b/lib/modifiers/index.js
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+
+module.exports = {
+    Summary:        require('./summary')
+};
diff --git a/lib/modifiers/summary/__tests__/editArticle.js b/lib/modifiers/summary/__tests__/editArticle.js
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/lib/modifiers/summary/__tests__/editArticle.js
diff --git a/lib/modifiers/summary/__tests__/editPartTitle.js b/lib/modifiers/summary/__tests__/editPartTitle.js
new file mode 100644
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+++ b/lib/modifiers/summary/__tests__/editPartTitle.js
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+var Summary = require('../../../models/summary');
+var File = require('../../../models/file');
+
+describe('editPartTitle', function() {
+    var editPartTitle = require('../editPartTitle');
+    var summary = Summary.createFromParts(File(), [
+        {
+            articles: [
+                {
+                    title: 'My First Article',
+                    path: 'README.md'
+                },
+                {
+                    title: 'My Second Article',
+                    path: 'article.md'
+                }
+            ]
+        },
+        {
+            title: 'Test'
+        }
+    ]);
+
+    it('should correctly set title of first part', function() {
+        var newSummary = editPartTitle(summary, 0, 'Hello World');
+        var part = newSummary.getPart(0);
+
+        expect(part.getTitle()).toBe('Hello World');
+    });
+
+    it('should correctly set title of second part', function() {
+        var newSummary = editPartTitle(summary, 1, 'Hello');
+        var part = newSummary.getPart(1);
+
+        expect(part.getTitle()).toBe('Hello');
+    });
+
+    it('should not fail if part doesn\'t exist', function() {
+        var newSummary = editPartTitle(summary, 3, 'Hello');
+        expect(newSummary.getParts().size).toBe(2);
+    });
+});
+
+
diff --git a/lib/modifiers/summary/editArticle.js b/lib/modifiers/summary/editArticle.js
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+++ b/lib/modifiers/summary/editArticle.js
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+
+/**
+    Edit a list of articles
+
+    @param {List<Article>} articles
+    @param {String} level
+    @param {Article} newArticle
+    @return {List<Article>}
+*/
+function editArticleInList(articles, level, newArticle) {
+    return articles.map(function(article) {
+        var articleLevel = article.getLevel();
+
+        if (articleLevel == level) {
+            return article.merge(newArticle);
+        }
+
+        if (level.indexOf(articleLevel) === 0) {
+            var articles = editArticleInList(article.getArticles(), level, newArticle);
+            return article.set('articles', articles);
+        }
+
+        return article;
+    });
+}
+
+
+/**
+    Edit an article in a part
+
+    @param {Part} part
+    @param {String} level
+    @param {Article} newArticle
+    @return {Part}
+*/
+function editArticleInPart(part, level, newArticle) {
+    var articles = part.getArticles();
+    articles = editArticleInList(articles);
+
+    return part.set('articles', articles);
+}
+
+
+/**
+    Edit an article in a summary
+
+    @param {Summary} summary
+    @param {String} level
+    @param {Article} newArticle
+    @return {Summary}
+*/
+function editArticle(summary, level, newArticle) {
+    var parts = summary.getParts();
+
+    var levelParts = level.split('.');
+    var partIndex = Number(levelParts[0]);
+
+    var part = parts.get(partIndex);
+    if (!part) {
+        return summary;
+    }
+
+    part = editArticleInPart(part, level, newArticle);
+    parts = parts.set(partIndex, part);
+
+    return summary.set('parts', parts);
+}
+
+
+module.exports = editArticle;
diff --git a/lib/modifiers/summary/editArticleTitle.js b/lib/modifiers/summary/editArticleTitle.js
new file mode 100644
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+++ b/lib/modifiers/summary/editArticleTitle.js
@@ -0,0 +1,17 @@
+var editArticle = require('./editArticle');
+
+/**
+    Edit title of an article
+
+    @param {Summary} summary
+    @param {String} level
+    @param {String} newTitle
+    @return {Summary}
+*/
+function editArticleTitle(summary, level, newTitle) {
+    return editArticle(summary, level, {
+        title: newTitle
+    });
+}
+
+module.exports = editArticleTitle;
diff --git a/lib/modifiers/summary/editPartTitle.js b/lib/modifiers/summary/editPartTitle.js
new file mode 100644
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+++ b/lib/modifiers/summary/editPartTitle.js
@@ -0,0 +1,24 @@
+
+/**
+    Edit title of a part in the summary
+
+    @param {Summary} summary
+    @param {Number} index
+    @param {String} newTitle
+    @return {Summary}
+*/
+function editPartTitle(summary, index, newTitle) {
+    var parts = summary.getParts();
+
+    var part = parts.get(index);
+    if (!part) {
+        return summary;
+    }
+
+    part = part.set('title', newTitle);
+    parts = parts.set(index, part);
+
+    return summary.set('parts', parts);
+}
+
+module.exports = editPartTitle;
diff --git a/lib/modifiers/summary/index.js b/lib/modifiers/summary/index.js
new file mode 100644
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+++ b/lib/modifiers/summary/index.js
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+
+module.exports = {
+    insertArticle:      require('./insertArticle'),
+    unshiftArticle:     require('./unshiftArticle'),
+
+    editPartTitle:      require('./editPartTitle'),
+    editArticleTitle:   require('./editArticleTitle')
+};
diff --git a/lib/modifiers/summary/indexArticleLevels.js b/lib/modifiers/summary/indexArticleLevels.js
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+++ b/lib/modifiers/summary/indexArticleLevels.js
@@ -0,0 +1,23 @@
+
+/**
+    Index levels in an article tree
+
+    @param {Article}
+    @param {String} baseLevel
+    @return {Article}
+*/
+function indexArticleLevels(article, baseLevel) {
+    baseLevel = baseLevel || article.getLevel();
+    var articles = article.getArticles();
+
+    articles = articles.map(function(inner, i) {
+        return indexArticleLevels(inner, baseLevel + '.' + (i + 1));
+    });
+
+    return article.merge({
+        level: baseLevel,
+        articles: articles
+    });
+}
+
+module.exports = indexArticleLevels;
diff --git a/lib/modifiers/summary/indexLevels.js b/lib/modifiers/summary/indexLevels.js
new file mode 100644
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--- /dev/null
+++ b/lib/modifiers/summary/indexLevels.js
@@ -0,0 +1,17 @@
+var indexPartLevels = require('./indexPartLevels');
+
+/**
+    Index all levels in the summary
+
+    @param {Summary}
+    @return {Summary}
+*/
+function indexLevels(summary) {
+    var parts = summary.getParts();
+    parts = parts.map(indexPartLevels);
+
+    return summary.set('parts', parts);
+}
+
+
+module.exports = indexLevels;
diff --git a/lib/modifiers/summary/indexPartLevels.js b/lib/modifiers/summary/indexPartLevels.js
new file mode 100644
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--- /dev/null
+++ b/lib/modifiers/summary/indexPartLevels.js
@@ -0,0 +1,24 @@
+var indexArticleLevels = require('./indexArticleLevels');
+
+/**
+    Index levels in a part
+
+    @param {Part}
+    @param {Number} index
+    @return {Part}
+*/
+function indexPartLevels(part, index) {
+    var baseLevel = String(index + 1);
+    var articles = part.getArticles();
+
+    articles = articles.map(function(inner, i) {
+        return indexArticleLevels(inner, baseLevel + '.' + (i + 1));
+    });
+
+    return part.merge({
+        level: baseLevel,
+        articles: articles
+    });
+}
+
+module.exports = indexPartLevels;
diff --git a/lib/modifiers/summary/insertArticle.js b/lib/modifiers/summary/insertArticle.js
new file mode 100644
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+++ 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;
diff --git a/lib/modifiers/summary/unshiftArticle.js b/lib/modifiers/summary/unshiftArticle.js
new file mode 100644
index 0000000..3f2ae4d
--- /dev/null
+++ b/lib/modifiers/summary/unshiftArticle.js
@@ -0,0 +1,29 @@
+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);
+    part = part.set('articles', articles);
+
+    parts = parts.set(0, part);
+    summary = summary.set('parts', parts);
+
+    return indexLevels(summary);
+}
+
+module.exports = unshiftArticle;