WIP: Theme support

Kittybox can now ship with several different stylesheets, provided by
the renderer. Unknown stylesheets fall back to the default one, which is
the same Kittybox has shipped since its inception.

There's also a settings field for custom CSS, but it's not exposed
anywhere yet.

Change-Id: I2850dace5c40f9fed04b4651c551a861df5b83d3

4 files changed, 30 insertions, 3 deletions

diff --git a/templates/Cargo.toml b/templates/Cargo.toml
index ca56dfe..de81af5 100644
--- a/templates/Cargo.toml
+++ b/templates/Cargo.toml
@@ -23,6 +23,7 @@ http = { workspace = true }
 include_dir = { workspace = true }
 markup = { workspace = true }
 serde_json = { workspace = true }
+serde = { workspace = true }
 
 [dependencies.kittybox-util]
 version = "0.3.0"
diff --git a/templates/src/lib.rs b/templates/src/lib.rs
index 0f9f7c6..194a837 100644
--- a/templates/src/lib.rs
+++ b/templates/src/lib.rs
@@ -10,6 +10,7 @@ mod mf2;
 pub use mf2::{Entry, Feed, Food, VCard, POSTS_PER_PAGE};
 pub mod admin;
 pub mod assets;
+pub mod themes;
 
 #[cfg(test)]
 mod tests {
diff --git a/templates/src/templates.rs b/templates/src/templates.rs
index 5772b4d..785a4b8 100644
--- a/templates/src/templates.rs
+++ b/templates/src/templates.rs
@@ -1,16 +1,16 @@
 #![allow(clippy::needless_lifetimes)]
-use crate::{Feed, VCard};
+use crate::{themes::ThemeName, Feed, VCard};
 use http::StatusCode;
 use kittybox_util::micropub::Channel;
 
 markup::define! {
-    Template<'a>(title: &'a str, blog_name: &'a str, feeds: Vec<Channel>, user: Option<&'a kittybox_indieauth::ProfileUrl>, content: String) {
+    Template<'a>(title: &'a str, blog_name: &'a str, feeds: Vec<Channel>, theme: ThemeName, user: Option<&'a kittybox_indieauth::ProfileUrl>, content: String) {
         @markup::doctype()
         html {
             head {
                 title { @title }
                 link[rel="preconnect", href="https://fonts.gstatic.com"];
-                link[rel="stylesheet", href="/.kittybox/static/style.css"];
+                link[rel="stylesheet", href=theme.into_css_link()];
                 meta[name="viewport", content="initial-scale=1, width=device-width"];
 
                 link[rel="micropub", href="/.kittybox/micropub"];
diff --git a/templates/src/themes.rs b/templates/src/themes.rs
new file mode 100644
index 0000000..ebc0ed9
--- /dev/null
+++ b/templates/src/themes.rs
@@ -0,0 +1,25 @@
+#[derive(Debug, Default, serde::Serialize, serde::Deserialize, Clone, Copy, PartialEq, Eq)]
+#[serde(rename_all = "snake_case")]
+/// Choices of themes possible in Kittybox.
+pub enum ThemeName {
+    #[default]
+    /// Default theme shipped with Kittybox.
+    Kittybox,
+    /// "Serious business" theme, typeset like a business memo.
+    VivianWork,
+    /// Emulation of the old style websites used back in the day.
+    Retro,
+    /// Custom CSS specified by user.
+    Custom,
+}
+
+impl ThemeName {
+    pub(crate) fn into_css_link(self) -> &'static str {
+        match self {
+            ThemeName::Kittybox => "/.kittybox/static/style.css",
+            ThemeName::VivianWork => "/.kittybox/static/vivian_work.style.css",
+            ThemeName::Retro => "/.kittybox/static/retro.style.css",
+            ThemeName::Custom => "/.kittybox/custom_style.css",
+        }
+    }
+}