From 75a855cd8d2c9ab3653e82a8ef94139571e3a7cd Mon Sep 17 00:00:00 2001
From: Lorenz Leitner <lrnz.ltnr@gmail.com>
Date: Tue, 12 Oct 2021 08:59:29 +0200
Subject: Move short url to back of result

---
 src/util/formatting.rs | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 src/util/formatting.rs

(limited to 'src/util/formatting.rs')

diff --git a/src/util/formatting.rs b/src/util/formatting.rs
new file mode 100644
index 0000000..add3f1b
--- /dev/null
+++ b/src/util/formatting.rs
@@ -0,0 +1,50 @@
+/// Truncates a string after a certain number of characters.
+/// Function always tries to truncate on a word boundary.
+/// Reimplemented from gonzobot.
+pub(crate) fn truncate(text: &str, len: usize) -> String {
+    if text.len() <= len {
+        return text.to_string();
+    }
+    format!(
+        "{}…",
+        text[..len]
+            .rsplitn(2, " ")
+            .collect::<Vec<&str>>()
+            .last()
+            .copied()
+            .expect("This can never happen >inb4 it happens")
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::truncate;
+
+    #[test]
+    fn test_truncate_with_input_of_lesser_length_than_limit() {
+        let input = "short text";
+        let result = truncate(input, input.len() + 1);
+        assert_eq!(input, result)
+    }
+
+    #[test]
+    fn test_truncate_with_input_of_equal_length_as_limit() {
+        let input = "short text";
+        let result = truncate(input, input.len());
+        assert_eq!(input, result)
+    }
+
+    #[test]
+    fn test_truncate_with_input_of_greater_length_than_limit() {
+        let input = "some longer text";
+        let result = truncate(input, input.len() - 1);
+        assert_eq!("some longer…", result)
+    }
+
+    #[test]
+    fn test_truncate_with_input_of_greater_length_than_limit_oneword() {
+        let input = "somelongertext";
+        let result = truncate(input, input.len() - 1);
+        assert_eq!("somelongertex…", result)
+    }
+}
-- 
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