Implement RenderBlogStream::new.

I still need to implement RenderBlogStreamEntry::new.

src/context/blog_stream.rs

@@ -6,6 +6,7 @@ use crate::config::Config;
 use crate::context::RenderDocumentElement;
 use crate::context::RenderRealFootnoteDefinition;
 use crate::error::CustomError;
+use crate::intermediate::get_web_path;
 use crate::intermediate::BlogPost;
 
 use super::GlobalSettings;
@@ -31,7 +32,45 @@ impl RenderBlogStream {
         older_link: Option<String>,
         newer_link: Option<String>,
     ) -> Result<RenderBlogStream, CustomError> {
-        todo!()
+        let css_files = vec![
+            // get_web_path(
+            //     config,
+            //     output_directory,
+            //     output_file,
+            //     "stylesheet/reset.css",
+            // )?,
+            get_web_path(config, output_directory, output_file, "stylesheet/main.css")?,
+        ];
+        let js_files = vec![get_web_path(
+            config,
+            output_directory,
+            output_file,
+            "blog_post.js",
+        )?];
+        let global_settings = GlobalSettings::new(
+            config.get_site_title().map(str::to_string),
+            css_files,
+            js_files,
+        );
+        let page_header = PageHeader::new(
+            config.get_site_title().map(str::to_string),
+            Some(get_web_path(config, output_directory, output_file, "")?),
+        );
+
+        let children = original
+            .into_iter()
+            .map(|blog_post| {
+                RenderBlogStreamEntry::new(config, output_directory, output_file, blog_post)
+            })
+            .collect::<Result<Vec<_>, _>>()?;
+
+        Ok(RenderBlogStream {
+            global_settings,
+            page_header: Some(page_header),
+            children,
+            older_link,
+            newer_link,
+        })
     }
 }
 
@@ -46,3 +85,14 @@ pub(crate) struct RenderBlogStreamEntry {
 
     footnotes: Vec<RenderRealFootnoteDefinition>,
 }
+
+impl RenderBlogStreamEntry {
+    pub(crate) fn new(
+        config: &Config,
+        output_directory: &Path,
+        output_file: &Path,
+        original: &BlogPost,
+    ) -> Result<RenderBlogStreamEntry, CustomError> {
+        todo!()
+    }
+}