Merge news and email search results

server/src/lib.rs

@@ -345,3 +345,39 @@ pub fn sanitize_html(
 
     Ok(clean_html)
 }
+
+fn compute_offset_limit(
+    after: Option<i32>,
+    before: Option<i32>,
+    first: Option<i32>,
+    last: Option<i32>,
+) -> (i32, i32) {
+    let default_page_size = 100;
+    match (after, before, first, last) {
+        // Reasonable defaults
+        (None, None, None, None) => (0, default_page_size),
+        (None, None, Some(first), None) => (0, first),
+        (Some(after), None, None, None) => (after, default_page_size),
+        (Some(after), None, Some(first), None) => (after, first),
+        (None, Some(before), None, None) => (0.max(before - default_page_size), default_page_size),
+        (None, Some(before), None, Some(last)) => (0.max(before - last), last),
+        (None, None, None, Some(_)) => {
+            panic!("specifying last and no before doesn't make sense")
+        }
+        (None, None, Some(_), Some(_)) => {
+            panic!("specifying first and last doesn't make sense")
+        }
+        (None, Some(_), Some(_), _) => {
+            panic!("specifying before and first doesn't make sense")
+        }
+        (Some(_), Some(_), _, _) => {
+            panic!("specifying after and before doesn't make sense")
+        }
+        (Some(_), None, None, Some(_)) => {
+            panic!("specifying after and last doesn't make sense")
+        }
+        (Some(_), None, Some(_), Some(_)) => {
+            panic!("specifying after, first and last doesn't make sense")
+        }
+    }
+}