From 855d2376dfe8033f8c722947427436b3120342a5 Mon Sep 17 00:00:00 2001
From: Vincent Prouillet <balthek@gmail.com>
Date: Mon, 10 Feb 2020 23:09:22 +0100
Subject: [PATCH] Fix some theme extension

Closes #937
---
 components/site/src/lib.rs                 |  8 ++++--
 components/utils/src/templates.rs          | 33 ++++++++++++++++------
 components/utils/test-templates/base.html  | 10 +++++++
 components/utils/test-templates/index.html |  6 +++-
 4 files changed, 44 insertions(+), 13 deletions(-)
 create mode 100644 components/utils/test-templates/base.html

diff --git a/components/site/src/lib.rs b/components/site/src/lib.rs
index c83c8607..eaba38e9 100644
--- a/components/site/src/lib.rs
+++ b/components/site/src/lib.rs
@@ -76,17 +76,19 @@ impl Site {
             );
             let mut tera_theme = Tera::parse(&theme_tpl_glob)
                 .map_err(|e| Error::chain("Error parsing templates from themes", e))?;
-            rewrite_theme_paths(&mut tera_theme, &theme);
+            rewrite_theme_paths(
+                &mut tera_theme,
+                tera.templates.values().map(|v| v.name.as_ref()).collect(),
+                &theme,
+            );
             // TODO: we do that twice, make it dry?
             if theme_path.join("templates").join("robots.txt").exists() {
                 tera_theme
                     .add_template_file(theme_path.join("templates").join("robots.txt"), None)?;
             }
-            tera_theme.build_inheritance_chains()?;
             tera.extend(&tera_theme)?;
         }
         tera.extend(&ZOLA_TERA)?;
-        // the `extend` above already does it but hey
         tera.build_inheritance_chains()?;
 
         // TODO: Tera doesn't use globset right now so we can load the robots.txt as part
diff --git a/components/utils/src/templates.rs b/components/utils/src/templates.rs
index 0e526f69..5c25d255 100644
--- a/components/utils/src/templates.rs
+++ b/components/utils/src/templates.rs
@@ -67,17 +67,21 @@ pub fn render_template(
 /// or macros is always better anyway for themes
 /// This will also rename the shortcodes to NOT have the themes in the path
 /// so themes shortcodes can be used.
-pub fn rewrite_theme_paths(tera: &mut Tera, theme: &str) {
+pub fn rewrite_theme_paths(tera_theme: &mut Tera, site_templates: Vec<&str>, theme: &str) {
     let mut shortcodes_to_move = vec![];
     let mut templates = HashMap::new();
-    let old_templates = ::std::mem::replace(&mut tera.templates, HashMap::new());
+    let old_templates = ::std::mem::replace(&mut tera_theme.templates, HashMap::new());
 
     // We want to match the paths in the templates to the new names
     for (key, mut tpl) in old_templates {
         tpl.name = format!("{}/templates/{}", theme, tpl.name);
-        // First the parent if there is none
+        // First the parent if there is one
+        // If a template with the same name is also in site, assumes it overrides the theme one
+        // and do not change anything
         if let Some(ref p) = tpl.parent.clone() {
-            tpl.parent = Some(format!("{}/templates/{}", theme, p));
+            if !site_templates.contains(&p.as_ref()) {
+                tpl.parent = Some(format!("{}/templates/{}", theme, p));
+            }
         }
 
         // Next the macros import
@@ -96,12 +100,12 @@ pub fn rewrite_theme_paths(tera: &mut Tera, theme: &str) {
         templates.insert(tpl.name.clone(), tpl);
     }
 
-    tera.templates = templates;
+    tera_theme.templates = templates;
 
     // and then replace shortcodes in the Tera instance using the new names
     for (old_name, new_name) in shortcodes_to_move {
-        let tpl = tera.templates.remove(&old_name).unwrap();
-        tera.templates.insert(new_name, tpl);
+        let tpl = tera_theme.templates.remove(&old_name).unwrap();
+        tera_theme.templates.insert(new_name, tpl);
     }
 }
 
@@ -113,12 +117,23 @@ mod tests {
     #[test]
     fn can_rewrite_all_paths_of_theme() {
         let mut tera = Tera::parse("test-templates/*.html").unwrap();
-        rewrite_theme_paths(&mut tera, "hyde");
+        rewrite_theme_paths(&mut tera, vec!["base.html"], "hyde");
         // special case to make the test work: we also rename the files to
         // match the imports
-        for (key, val) in tera.templates.clone() {
+        for (key, val) in &tera.templates.clone() {
             tera.templates.insert(format!("hyde/templates/{}", key), val.clone());
         }
+        // Adding our fake base
+        tera.add_raw_template("base.html", "Hello").unwrap();
         tera.build_inheritance_chains().unwrap();
+
+        assert_eq!(
+            tera.templates["hyde/templates/index.html"].parent,
+            Some("base.html".to_string())
+        );
+        assert_eq!(
+            tera.templates["hyde/templates/child.html"].parent,
+            Some("hyde/templates/index.html".to_string())
+        );
     }
 }
diff --git a/components/utils/test-templates/base.html b/components/utils/test-templates/base.html
new file mode 100644
index 00000000..d562d6b3
--- /dev/null
+++ b/components/utils/test-templates/base.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+    </head>
+
+    <body>
+    {% block body %}
+    {% endblock body %}
+    </body>
+</html>
\ No newline at end of file
diff --git a/components/utils/test-templates/index.html b/components/utils/test-templates/index.html
index c15db638..b4fbbb6c 100644
--- a/components/utils/test-templates/index.html
+++ b/components/utils/test-templates/index.html
@@ -1 +1,5 @@
-Some base template, used in tests to check whether path rewriting works.
+{% extends "base.html" %}
+
+{% block body %}
+The default text
+{% endblock body %}