From 7b5a7c52bd9fbd256776ca6737447cf78f80aa57 Mon Sep 17 00:00:00 2001
From: Ben Bridle <bridle.benjamin@gmail.com>
Date: Tue, 7 Jan 2025 22:17:52 +1300
Subject: Load default CSS and JavaScript files from site root

Instead of linking to a static path for the CSS and JavaScript files in
the head of each generated HTML document, dynamically generate a
relative path that backtracks to the site root before descending into
the chosen directory. This ensures that all pages will link to the same
set of CSS/JS files, no matter how deeply nested.

This could have been accomplished through the use of absolute paths,
but I want the websites generated by this program to be able to be
freely mixed and matched with existing websites, which requires the use
of relative paths only.
---
 src/generate_html.rs | 13 +++++++------
 src/main.rs          | 12 ++++++++++++
 2 files changed, 19 insertions(+), 6 deletions(-)

(limited to 'src')

diff --git a/src/generate_html.rs b/src/generate_html.rs
index 1e3acc7..f14d5f9 100644
--- a/src/generate_html.rs
+++ b/src/generate_html.rs
@@ -20,23 +20,24 @@ pub fn generate_html(document: &MarkdownDocument, page: &SourceFile, website: &W
 </html> \
 ",
         page.name, website.name,
-        get_html_head(document).trim(),
+        get_html_head(document, page).trim(),
         document_to_html(document, page, website).trim()
     )
 }
 
 
 
-pub fn get_html_head(document: &MarkdownDocument) -> String {
+pub fn get_html_head(document: &MarkdownDocument, page: &SourceFile) -> String {
     if let Some(Block::Fragment { language, content }) = document.blocks.first() {
         if language == "embed-html-head" {
             return content.to_string();
         }
     }
-    String::from("\
-<link rel='stylesheet' type='text/css' media='screen' href='/static/screen.css'>
-<link rel='stylesheet' type='text/css' media='print' href='/static/print.css'>
-<script src='/static/render_math.js' defer></script> \
+    let back = page.back_string();
+    format!("\
+<link rel='stylesheet' type='text/css' media='screen' href='{back}static/screen.css'>
+<link rel='stylesheet' type='text/css' media='print' href='{back}static/print.css'>
+<script src='{back}static/render_math.js' defer></script> \
     ")
 }
 
diff --git a/src/main.rs b/src/main.rs
index a1b38f6..0a62ec2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -247,6 +247,18 @@ pub struct SourceFile {
     pub headings: Vec<String>,
 }
 
+impl SourceFile {
+    pub fn back_string(&self) -> String {
+        let mut back = String::new();
+        for c in self.full_url.chars() {
+            if c == '/' {
+                back.push_str("../");
+            }
+        }
+        return back;
+    }
+}
+
 pub struct StaticFile {
     pub full_url: String,  // URL full path, with extension
     pub source_path: PathBuf,
-- 
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