Complete overhaul of render/rasterize/parsing/templates/routes subsystems

src/template.rs

@@ -0,0 +1,47 @@
+use chrono::{DateTime, FixedOffset, Utc};
+use timeago::Formatter;
+use tera::{Context, Tera};
+use lazy_static::lazy_static;
+
+lazy_static! {
+    static ref TEMPLATES: Tera = {
+        let mut _tera = match Tera::new("templates/**/*.svg") {
+            Ok(t) => {
+                let names: Vec<&str> = t.get_template_names().collect();
+                println!("{} templates found ([{}]).", names.len(), names.join(", "));
+                t
+            },
+            Err(e) => {
+                println!("Parsing error(s): {}", e);
+                ::std::process::exit(1);
+            }
+        };
+        _tera
+    };
+}
+
+pub enum OutputForm {
+    Relative,
+    Absolute,
+}
+
+pub struct RenderContext<'a> {
+    pub output_form: OutputForm,
+    pub value: DateTime<Utc>,
+    pub tz_offset: FixedOffset,
+    pub tz_name: &'a str,
+    pub view: &'a str,
+}
+
+pub fn render_template(context: RenderContext) -> Result<String, tera::Error> {
+    let mut template_context = Context::new();
+    let formatter = Formatter::new();
+
+    template_context.insert("text", match context.output_form {
+        OutputForm::Relative => formatter.convert_chrono(context.value, Utc::now()),
+        OutputForm::Absolute => context.value.to_rfc3339()
+    }.as_str());
+
+    TEMPLATES.render("basic.svg", &template_context)
+}
+