1 files changed, 46 insertions, 0 deletions
diff --git a/src/template.rs b/src/template.rs
new file mode 100644
index 0000000..89c1a15
--- /dev/null
+++ b/src/template.rs
@@ -0,0 +1,46 @@
+use crate::error::JournalError;
+use std::path::Path;
+use tera::{Context, Tera};
+
+const NEW_ENTRY: &str = r#"[[!meta title="{{ title }}"]]
+[[!meta date="{{ date }}"]]
+
+This is the default template.
+"#;
+
+pub struct Templates {
+    tera: Tera,
+}
+
+impl Templates {
+    pub fn new(dirname: &Path) -> Result<Self, JournalError> {
+        let glob = format!("{}/.config/templates/*", dirname.display());
+        let mut tera = Tera::new(&glob).expect("Tera::new");
+        add_default_template(&mut tera, "new_entry", NEW_ENTRY);
+        Ok(Self { tera })
+    }
+
+    pub fn new_draft(&self, context: &Context) -> Result<String, JournalError> {
+        self.render("new_entry", &context)
+    }
+
+    fn render(&self, name: &str, context: &Context) -> Result<String, JournalError> {
+        match self.tera.render(name, &context) {
+            Ok(s) => Ok(s),
+            Err(e) => match e.kind {
+                tera::ErrorKind::TemplateNotFound(x) => Err(JournalError::TemplateNotFound(x)),
+                _ => Err(JournalError::TemplateRender(name.to_string(), e)),
+            },
+        }
+    }
+}
+
+fn add_default_template(tera: &mut Tera, name: &str, template: &str) {
+    let context = Context::new();
+    if let Err(err) = tera.render(name, &context) {
+        if let tera::ErrorKind::TemplateNotFound(_) = err.kind {
+            tera.add_raw_template(name, template)
+                .expect("Tera::add_raw_template");
+        }
+    }
+}