Smarter rebuild on content change

Fix #59

CHANGELOG.md

@@ -4,11 +4,14 @@
 
 - Fix XML templates overriding and reloading
 - `title` and `description` are now optional in the front matter
-- Add GenericConfig, Vim syntax
+- Add GenericConfig, Vim, Jinja2 syntax
 - Add `_index.md` for homepage as well and make that into a normal section
 - Allow sorting by `none`, `date` and `order` for sections
 - Add pagination
 - Add a `get_page` global function to tera
+- Revamp index page, no more `pages` variables
+- Fix livereload stopping randomly
+- Smarter re-rendering in `serve` command
 
 ## 0.0.4 (2017-04-23)
 

src/bin/cmd/serve.rs

@@ -14,6 +14,7 @@ use gutenberg::Site;
 use gutenberg::errors::{Result, ResultExt};
 
 use console;
+use rebuild;
 
 #[derive(Debug, PartialEq)]
 enum ChangeKind {
@@ -137,12 +138,12 @@ pub fn serve(interface: &str, port: &str, config_file: &str) -> Result<()> {
                             (ChangeKind::Content, _) => {
                                 console::info(&format!("-> Content changed {}", path.display()));
                                 // Force refresh
-                                rebuild_done_handling(&broadcaster, site.rebuild_after_content_change(&path), "/x.js");
+                                rebuild_done_handling(&broadcaster, rebuild::after_content_change(&mut site, &path), "/x.js");
                             },
                             (ChangeKind::Templates, _) => {
                                 console::info(&format!("-> Template changed {}", path.display()));
                                 // Force refresh
-                                rebuild_done_handling(&broadcaster, site.rebuild_after_template_change(&path), "/x.js");
+                                rebuild_done_handling(&broadcaster, rebuild::after_template_change(&mut site, &path), "/x.js");
                             },
                             (ChangeKind::StaticFiles, p) => {
                                 if path.is_file() {

src/bin/gutenberg.rs

@@ -16,6 +16,7 @@ use std::time::Instant;
 
 mod cmd;
 mod console;
+mod rebuild;
 
 
 fn main() {

src/bin/rebuild.rs

@@ -0,0 +1,230 @@
+use std::path::Path;
+
+use gutenberg::{Site, SectionFrontMatter, PageFrontMatter};
+use gutenberg::errors::Result;
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+enum PageChangesNeeded {
+    /// Editing `tags`
+    Tags,
+    /// Editing `categories`
+    Categories,
+    /// Editing `date` or `order`
+    Sort,
+    /// Editing anything else
+    Render,
+}
+
+// TODO: seems like editing sort_by/render do weird stuff
+#[derive(Debug, Clone, Copy, PartialEq)]
+enum SectionChangesNeeded {
+    /// Editing `sort_by`
+    Sort,
+    /// Editing `title`, `description`, `extra`, `template` or setting `render` to true
+    Render,
+    /// Editing `paginate_by` or `paginate_path`
+    RenderWithPages,
+    /// Setting `render` to false
+    Delete,
+}
+
+/// Evaluates all the params in the front matter that changed so we can do the smallest
+/// delta in the serve command
+fn find_section_front_matter_changes(current: &SectionFrontMatter, other: &SectionFrontMatter) -> Vec<SectionChangesNeeded> {
+    let mut changes_needed = vec![];
+
+    if current.sort_by != other.sort_by {
+        changes_needed.push(SectionChangesNeeded::Sort);
+    }
+
+    if !current.should_render() && other.should_render() {
+        changes_needed.push(SectionChangesNeeded::Delete);
+        // Nothing else we can do
+        return changes_needed;
+    }
+
+    if current.paginate_by != other.paginate_by || current.paginate_path != other.paginate_path {
+        changes_needed.push(SectionChangesNeeded::RenderWithPages);
+        // Nothing else we can do
+        return changes_needed;
+    }
+
+    // Any other change will trigger a re-rendering of the section page only
+    changes_needed.push(SectionChangesNeeded::Render);
+    changes_needed
+}
+
+/// Evaluates all the params in the front matter that changed so we can do the smallest
+/// delta in the serve command
+fn find_page_front_matter_changes(current: &PageFrontMatter, other: &PageFrontMatter) -> Vec<PageChangesNeeded> {
+    let mut changes_needed = vec![];
+
+    if current.tags != other.tags {
+        changes_needed.push(PageChangesNeeded::Tags);
+    }
+
+    if current.category != other.category {
+        changes_needed.push(PageChangesNeeded::Categories);
+    }
+
+    if current.date != other.date || current.order != other.order {
+        changes_needed.push(PageChangesNeeded::Sort);
+    }
+
+    changes_needed.push(PageChangesNeeded::Render);
+    changes_needed
+}
+
+// What happens when a section or a page is changed
+pub fn after_content_change(site: &mut Site, path: &Path) -> Result<()> {
+    let is_section = path.file_name().unwrap() == "_index.md";
+
+    // A page or section got deleted
+    if !path.exists() {
+        if is_section {
+            // A section was deleted, many things can be impacted:
+            // - the pages of the section are becoming orphans
+            // - any page that was referencing the section (index, etc)
+            let relative_path = site.sections[path].relative_path.clone();
+            // Remove the link to it and the section itself from the Site
+            site.permalinks.remove(&relative_path);
+            site.sections.remove(path);
+            site.populate_sections();
+        } else {
+            // A page was deleted, many things can be impacted:
+            // - the section the page is in
+            // - any page that was referencing the section (index, etc)
+            let relative_path = site.pages[path].relative_path.clone();
+            site.permalinks.remove(&relative_path);
+            match site.pages.remove(path) {
+                Some(p) => {
+                    if p.meta.has_tags() || p.meta.category.is_some() {
+                        site.populate_tags_and_categories();
+                    }
+
+                    if site.find_parent_section(&p).is_some() {
+                        site.populate_sections();
+                    }
+                },
+                None => ()
+            };
+        }
+        // Deletion is something that doesn't happen all the time so we
+        // don't need to optimise it too much
+        return site.build();
+    }
+
+    // A section was edited
+    if is_section {
+        match site.add_section(path, true)? {
+            Some(prev) => {
+                // Updating a section
+                let current_meta = site.sections[path].meta.clone();
+                // Front matter didn't change, only content did
+                // so we render only the section page, not its pages
+                if current_meta == prev.meta {
+                    return site.render_section(&site.sections[path], false);
+                }
+
+                // Front matter changed
+                for changes in find_section_front_matter_changes(&current_meta, &prev.meta) {
+                    // Sort always comes first if present so the rendering will be fine
+                    match changes {
+                        SectionChangesNeeded::Sort => site.sort_sections_pages(Some(path)),
+                        SectionChangesNeeded::Render => site.render_section(&site.sections[path], false)?,
+                        SectionChangesNeeded::RenderWithPages => site.render_section(&site.sections[path], true)?,
+                        // can't be arsed to make the Delete efficient, it's not a common enough operation
+                        SectionChangesNeeded::Delete => {
+                            site.populate_sections();
+                            site.build()?;
+                        },
+                    };
+                }
+                return Ok(());
+            },
+            None => {
+                // New section, only render that one
+                site.populate_sections();
+                return site.render_section(&site.sections[path], true);
+            }
+        };
+    }
+
+    // A page was edited
+    match site.add_page(path, true)? {
+        Some(prev) => {
+            // Updating a page
+            let current = site.pages[path].clone();
+            // Front matter didn't change, only content did
+            // so we render only the section page, not its pages
+            if current.meta == prev.meta {
+                return site.render_page(&site.pages[path]);
+            }
+
+            // Front matter changed
+            for changes in find_page_front_matter_changes(&current.meta, &prev.meta) {
+                // Sort always comes first if present so the rendering will be fine
+                match changes {
+                    PageChangesNeeded::Tags => {
+                        site.populate_tags_and_categories();
+                        site.render_tags()?;
+                    },
+                    PageChangesNeeded::Categories => {
+                        site.populate_tags_and_categories();
+                        site.render_categories()?;
+                    },
+                    PageChangesNeeded::Sort => {
+                        let section_path = match site.find_parent_section(&site.pages[path]) {
+                            Some(s) => s.file_path.clone(),
+                            None => continue  // Do nothing if it's an orphan page
+                        };
+                        site.populate_sections();
+                        site.sort_sections_pages(Some(&section_path));
+                        site.render_index()?;
+                    },
+                    PageChangesNeeded::Render => {
+                        site.render_page(&site.pages[path])?;
+                    },
+                };
+            }
+            return Ok(());
+
+        },
+        None => {
+            // It's a new page!
+            site.populate_sections();
+            site.populate_tags_and_categories();
+            // No need to optimise that yet, we can revisit if it becomes an issue
+            site.build()?;
+        }
+    }
+
+    Ok(())
+}
+
+/// What happens when a template is changed
+pub fn after_template_change(site: &mut Site, path: &Path) -> Result<()> {
+    site.tera.full_reload()?;
+
+    match path.file_name().unwrap().to_str().unwrap() {
+        "sitemap.xml" => site.render_sitemap(),
+        "rss.xml" => site.render_rss_feed(),
+        "robots.txt" => site.render_robots(),
+        "categories.html" | "category.html" => site.render_categories(),
+        "tags.html" | "tag.html" => site.render_tags(),
+        "page.html" => {
+            site.render_sections()?;
+            site.render_orphan_pages()
+        },
+        "section.html" => site.render_sections(),
+        // Either the index or some unknown template changed
+        // We can't really know what this change affects so rebuild all
+        // the things
+        _ => {
+            site.render_sections()?;
+            site.render_orphan_pages()?;
+            site.render_categories()?;
+            site.render_tags()
+        },
+    }
+}

src/front_matter/page.rs

@@ -26,11 +26,11 @@ pub struct PageFrontMatter {
     pub tags: Option<Vec<String>>,
     /// Whether this page is a draft and should be published or not
     pub draft: Option<bool>,
-    /// Only one category allowed
+    /// Only one category allowed. Can't be an empty string if present
     pub category: Option<String>,
     /// Integer to use to order content. Lowest is at the bottom, highest first
     pub order: Option<usize>,
-    /// Optional template, if we want to specify which template to render for that page
+    /// Specify a template different from `page.html` to use for that page
     #[serde(skip_serializing)]
     pub template: Option<String>,
     /// Any extra parameter present in the front matter
@@ -56,6 +56,12 @@ impl PageFrontMatter {
             }
         }
 
+        if let Some(ref category) = f.category {
+            if category == "" {
+                bail!("`category` can't be empty if present")
+            }
+        }
+
         Ok(f)
     }
 
@@ -76,6 +82,13 @@ impl PageFrontMatter {
     pub fn order(&self) -> usize {
         self.order.unwrap()
     }
+
+    pub fn has_tags(&self) -> bool {
+        match self.tags {
+            Some(ref t) => !t.is_empty(),
+            None => false
+        }
+    }
 }
 
 impl Default for PageFrontMatter {

src/page.rs

@@ -297,14 +297,7 @@ pub fn sort_pages(pages: Vec<Page>, sort_by: SortBy) -> (Vec<Page>, Vec<Page>) {
 
             (can_be_sorted, cannot_be_sorted)
         },
-        SortBy::None => {
-            let mut p = vec![];
-            for page in pages {
-                p.push(page);
-            }
-
-            (p, vec![])
-        },
+        SortBy::None => (pages,  vec![])
     }
 }
 

src/section.rs

@@ -134,6 +134,23 @@ impl Section {
         paths.extend(self.ignored_pages.iter().map(|p| p.file_path.clone()));
         paths
     }
+
+    /// Whether the page given belongs to that section
+    pub fn is_child_page(&self, page: &Page) -> bool {
+        for p in &self.pages {
+            if p.file_path == page.file_path {
+                return true;
+            }
+        }
+
+        for p in &self.ignored_pages {
+            if p.file_path == page.file_path {
+                return true;
+            }
+        }
+
+        false
+    }
 }
 
 impl ser::Serialize for Section {

src/site.rs

@@ -18,8 +18,6 @@ use front_matter::{SortBy};
 use templates::{GUTENBERG_TERA, global_fns, render_redirect_template};
 
 
-
-
 #[derive(Debug, PartialEq)]
 enum RenderList {
     Tags,
@@ -56,6 +54,8 @@ pub struct Site {
     static_path: PathBuf,
     pub tags: HashMap<String, Vec<PathBuf>>,
     pub categories: HashMap<String, Vec<PathBuf>>,
+    /// A map of all .md files (section and pages) and their permalink
+    /// We need that if there are relative links in the content that need to be resolved
     pub permalinks: HashMap<String, String>,
 }
 
@@ -92,6 +92,7 @@ impl Site {
     }
 
     /// Gets the path of all ignored pages in the site
+    /// Used for reporting them in the CLI
     pub fn get_ignored_pages(&self) -> Vec<PathBuf> {
         self.sections
             .values()
@@ -117,6 +118,17 @@ impl Site {
         orphans
     }
 
+    /// Finds the section that contains the page given if there is one
+    pub fn find_parent_section(&self, page: &Page) -> Option<&Section> {
+        for section in self.sections.values() {
+            if section.is_child_page(page) {
+                return Some(section)
+            }
+        }
+
+        None
+    }
+
     /// Used by tests to change the output path to a tmp dir
     #[doc(hidden)]
     pub fn set_output_path<P: AsRef<Path>>(&mut self, path: P) {
@@ -132,9 +144,9 @@ impl Site {
         for entry in glob(&content_glob).unwrap().filter_map(|e| e.ok()) {
             let path = entry.as_path();
             if path.file_name().unwrap() == "_index.md" {
-                self.add_section(path)?;
+                self.add_section(path, false)?;
             } else {
-                self.add_page(path)?;
+                self.add_page(path, false)?;
             }
         }
         // Insert a default index section so we don't need to create a _index.md to render
@@ -146,27 +158,15 @@ impl Site {
             self.sections.insert(index_path, index_section);
         }
 
-        // A map of all .md files (section and pages) and their permalink
-        // We need that if there are relative links in the content that need to be resolved
-        let mut permalinks = HashMap::new();
-
-        for page in self.pages.values() {
-            permalinks.insert(page.relative_path.clone(), page.permalink.clone());
-        }
-
-        for section in self.sections.values() {
-            permalinks.insert(section.relative_path.clone(), section.permalink.clone());
-        }
-
+        // TODO: make that parallel
         for page in self.pages.values_mut() {
-            page.render_markdown(&permalinks, &self.tera, &self.config)?;
+            page.render_markdown(&self.permalinks, &self.tera, &self.config)?;
         }
-
+        // TODO: make that parallel
         for section in self.sections.values_mut() {
-            section.render_markdown(&permalinks, &self.tera, &self.config)?;
+            section.render_markdown(&self.permalinks, &self.tera, &self.config)?;
         }
 
-        self.permalinks = permalinks;
         self.populate_sections();
         self.populate_tags_and_categories();
 
@@ -175,73 +175,82 @@ impl Site {
         Ok(())
     }
 
-    /// Simple wrapper fn to avoid repeating that code in several places
-    fn add_page(&mut self, path: &Path) -> Result<()> {
+    /// Add a page to the site
+    /// The `render` parameter is used in the serve command, when rebuilding a page.
+    /// If `true`, it will also render the markdown for that page
+    /// Returns the previous page struct if there was one
+    pub fn add_page(&mut self, path: &Path, render: bool) -> Result<Option<Page>> {
         let page = Page::from_file(&path, &self.config)?;
-        self.pages.insert(page.file_path.clone(), page);
-        Ok(())
-    }
+        self.permalinks.insert(page.relative_path.clone(), page.permalink.clone());
+        let prev = self.pages.insert(page.file_path.clone(), page);
 
-    /// Simple wrapper fn to avoid repeating that code in several places
-    fn add_section(&mut self, path: &Path) -> Result<()> {
-        let section = Section::from_file(path, &self.config)?;
-        self.sections.insert(section.file_path.clone(), section);
-        Ok(())
-    }
+        if render {
+            let mut page = self.pages.get_mut(path).unwrap();
+            page.render_markdown(&self.permalinks, &self.tera, &self.config)?;
+        }
 
-    /// Called in serve, add the section and render it
-    fn add_section_and_render(&mut self, path: &Path) -> Result<()> {
-        self.add_section(path)?;
-        let mut section = self.sections.get_mut(path).unwrap();
-        self.permalinks.insert(section.relative_path.clone(), section.permalink.clone());
-        section.render_markdown(&self.permalinks, &self.tera, &self.config)?;
-        Ok(())
+        Ok(prev)
     }
 
-    /// Called in serve, add a page again updating permalinks and its content
-    /// The bool in the result is whether the front matter has been updated or not
-    /// TODO: the above is very confusing, change that
-    fn add_page_and_render(&mut self, path: &Path) -> Result<(bool, Page)> {
-        let existing_page = self.pages.get(path).cloned();
-        self.add_page(path)?;
-        let mut page = self.pages.get_mut(path).unwrap();
-        self.permalinks.insert(page.relative_path.clone(), page.permalink.clone());
-        page.render_markdown(&self.permalinks, &self.tera, &self.config)?;
+    /// Add a section to the site
+    /// The `render` parameter is used in the serve command, when rebuilding a page.
+    /// If `true`, it will also render the markdown for that page
+    /// Returns the previous page struct if there was one
+    pub fn add_section(&mut self, path: &Path, render: bool) -> Result<Option<Section>> {
+        let section = Section::from_file(path, &self.config)?;
+        self.permalinks.insert(section.relative_path.clone(), section.permalink.clone());
+        let prev = self.sections.insert(section.file_path.clone(), section);
 
-        if let Some(prev_page) = existing_page {
-            return Ok((prev_page.meta != page.meta, page.clone()));
+        if render {
+            let mut section = self.sections.get_mut(path).unwrap();
+            section.render_markdown(&self.permalinks, &self.tera, &self.config)?;
         }
-        Ok((true, page.clone()))
+
+        Ok(prev)
     }
 
     /// Find out the direct subsections of each subsection if there are some
     /// as well as the pages for each section
     pub fn populate_sections(&mut self) {
-        for page in self.pages.values() {
-            if self.sections.contains_key(&page.parent_path.join("_index.md")) {
-                self.sections.get_mut(&page.parent_path.join("_index.md")).unwrap().pages.push(page.clone());
-            }
-        }
-
         let mut grandparent_paths = HashMap::new();
-        for section in self.sections.values() {
+        for section in self.sections.values_mut() {
             if let Some(grand_parent) = section.parent_path.parent() {
                 grandparent_paths.entry(grand_parent.to_path_buf()).or_insert_with(|| vec![]).push(section.clone());
             }
+            // Make sure the pages of a section are empty since we can call that many times on `serve`
+            section.pages = vec![];
+            section.ignored_pages = vec![];
         }
 
-        for section in self.sections.values_mut() {
-            // TODO: avoid this clone
-            let (mut sorted_pages, cannot_be_sorted_pages) = sort_pages(section.pages.clone(), section.meta.sort_by());
-            sorted_pages = populate_previous_and_next_pages(&sorted_pages);
-            section.pages = sorted_pages;
-            section.ignored_pages = cannot_be_sorted_pages;
+        for page in self.pages.values() {
+            if self.sections.contains_key(&page.parent_path.join("_index.md")) {
+                self.sections.get_mut(&page.parent_path.join("_index.md")).unwrap().pages.push(page.clone());
+            }
+        }
 
+        for section in self.sections.values_mut() {
             match grandparent_paths.get(&section.parent_path) {
                 Some(paths) => section.subsections.extend(paths.clone()),
                 None => continue,
             };
         }
+
+        self.sort_sections_pages(None);
+    }
+
+    /// Sorts the pages of the section at the given path
+    /// By default will sort all sections but can be made to only sort a single one by providing a path
+    pub fn sort_sections_pages(&mut self, only: Option<&Path>) {
+        for (path, section) in self.sections.iter_mut() {
+            if let Some(p) = only {
+                if p != path {
+                    continue;
+                }
+            }
+            let (sorted_pages, cannot_be_sorted_pages) = sort_pages(section.pages.clone(), section.meta.sort_by());
+            section.pages = populate_previous_and_next_pages(&sorted_pages);
+            section.ignored_pages = cannot_be_sorted_pages;
+        }
     }
 
     /// Separated from `parse` for easier testing
@@ -277,7 +286,7 @@ impl Site {
         html
     }
 
-    pub fn ensure_public_directory_exists(&self) -> Result<()> {
+    fn ensure_public_directory_exists(&self) -> Result<()> {
         let public = self.output_path.clone();
         if !public.exists() {
             create_directory(&public)?;
@@ -324,58 +333,6 @@ impl Site {
         Ok(())
     }
 
-    pub fn rebuild_after_content_change(&mut self, path: &Path) -> Result<()> {
-        let is_section = path.ends_with("_index.md");
-
-        if path.exists() {
-            // file exists, either a new one or updating content
-            if is_section {
-                self.add_section_and_render(path)?;
-                self.render_sections()?;
-            } else {
-                // probably just an update so just re-parse that page
-                let (frontmatter_changed, page) = self.add_page_and_render(path)?;
-                // TODO: can probably be smarter and check what changed
-                if frontmatter_changed {
-                    self.populate_sections();
-                    self.populate_tags_and_categories();
-                    self.build()?;
-                } else {
-                    self.render_page(&page)?;
-                }
-            }
-        } else {
-            // File doesn't exist -> a deletion so we remove it from everything
-            let relative_path = if is_section {
-                self.sections[path].relative_path.clone()
-            } else {
-                self.pages[path].relative_path.clone()
-            };
-            self.permalinks.remove(&relative_path);
-
-            if is_section {
-                self.sections.remove(path);
-            } else {
-                self.pages.remove(path);
-            }
-            // TODO: probably no need to do that, we should be able to only re-render a page or a section.
-            self.populate_sections();
-            self.populate_tags_and_categories();
-            self.build()?;
-        }
-
-        Ok(())
-    }
-
-    pub fn rebuild_after_template_change(&mut self, path: &Path) -> Result<()> {
-        self.tera.full_reload()?;
-        match path.file_name().unwrap().to_str().unwrap() {
-            "sitemap.xml" => self.render_sitemap(),
-            "rss.xml" => self.render_rss_feed(),
-            _ => self.build() // TODO: change that
-        }
-    }
-
     /// Renders a single content page
     pub fn render_page(&self, page: &Page) -> Result<()> {
         self.ensure_public_directory_exists()?;
@@ -417,18 +374,16 @@ impl Site {
             self.render_rss_feed()?;
         }
         self.render_robots()?;
-        if self.config.generate_categories_pages.unwrap() {
-            self.render_categories_and_tags(RenderList::Categories)?;
-        }
-        if self.config.generate_tags_pages.unwrap() {
-            self.render_categories_and_tags(RenderList::Tags)?;
-        }
+        // `render_categories` and `render_tags` will check whether the config allows
+        // them to render or not
+        self.render_categories()?;
+        self.render_tags()?;
 
         self.copy_static_directory()
     }
 
     /// Renders robots.txt
-    fn render_robots(&self) -> Result<()> {
+    pub fn render_robots(&self) -> Result<()> {
         self.ensure_public_directory_exists()?;
         create_file(
             self.output_path.join("robots.txt"),
@@ -436,8 +391,27 @@ impl Site {
         )
     }
 
+    /// Renders all categories if the config allows it
+    pub fn render_categories(&self) -> Result<()> {
+        if self.config.generate_categories_pages.unwrap() {
+            self.render_categories_and_tags(RenderList::Categories)
+        } else {
+            Ok(())
+        }
+    }
+
+    /// Renders all tags if the config allows it
+    pub fn render_tags(&self) -> Result<()> {
+        if self.config.generate_tags_pages.unwrap() {
+            self.render_categories_and_tags(RenderList::Tags)
+        } else {
+            Ok(())
+        }
+    }
+
     /// Render the /{categories, list} pages and each individual category/tag page
     /// They are the same thing fundamentally, a list of pages with something in common
+    /// TODO: revisit this function, lots of things have changed since then
     fn render_categories_and_tags(&self, kind: RenderList) -> Result<()> {
         let items = match kind {
             RenderList::Categories => &self.categories,
@@ -509,7 +483,8 @@ impl Site {
         Ok(())
     }
 
-    fn render_sitemap(&self) -> Result<()> {
+    /// What it says on the tin
+    pub fn render_sitemap(&self) -> Result<()> {
         self.ensure_public_directory_exists()?;
         let mut context = Context::new();
         context.add("pages", &self.pages.values().collect::<Vec<&Page>>());
@@ -544,7 +519,7 @@ impl Site {
         Ok(())
     }
 
-    fn render_rss_feed(&self) -> Result<()> {
+    pub fn render_rss_feed(&self) -> Result<()> {
         self.ensure_public_directory_exists()?;
 
         let mut context = Context::new();
@@ -587,7 +562,7 @@ impl Site {
     }
 
     /// Renders a single section
-    fn render_section(&self, section: &Section) -> Result<()> {
+    pub fn render_section(&self, section: &Section, render_pages: bool) -> Result<()> {
         self.ensure_public_directory_exists()?;
         let public = self.output_path.clone();
 
@@ -600,8 +575,10 @@ impl Site {
             }
         }
 
-        for page in &section.pages {
-            self.render_page(page)?;
+        if render_pages {
+            for page in &section.pages {
+                self.render_page(page)?;
+            }
         }
 
         if !section.meta.should_render() {
@@ -622,16 +599,20 @@ impl Site {
         Ok(())
     }
 
+    pub fn render_index(&self) -> Result<()> {
+        self.render_section(&self.sections[&self.base_path.join("content").join("_index.md")], false)
+    }
+
     /// Renders all sections
-    fn render_sections(&self) -> Result<()> {
+    pub fn render_sections(&self) -> Result<()> {
         for section in self.sections.values() {
-            self.render_section(section)?;
+            self.render_section(section, true)?;
         }
         Ok(())
     }
 
     /// Renders all pages that do not belong to any sections
-    fn render_orphan_pages(&self) -> Result<()> {
+    pub fn render_orphan_pages(&self) -> Result<()> {
         self.ensure_public_directory_exists()?;
 
         for page in self.get_all_orphan_pages() {