feat: first cut on M0 - base structure of project

crates/bds-core/src/util/slug.rs

@@ -0,0 +1,61 @@
+use deunicode::deunicode;
+
+/// Generate a URL-safe slug from a title string.
+///
+/// Transliterates Unicode to ASCII, lowercases, replaces non-alphanumeric
+/// chars with hyphens, and collapses/trims hyphens.
+pub fn slugify(input: &str) -> String {
+    let ascii = deunicode(input);
+    let lowered = ascii.to_lowercase();
+    let mut slug = String::with_capacity(lowered.len());
+    let mut prev_hyphen = true; // avoid leading hyphen
+    for c in lowered.chars() {
+        if c.is_ascii_alphanumeric() {
+            slug.push(c);
+            prev_hyphen = false;
+        } else if !prev_hyphen {
+            slug.push('-');
+            prev_hyphen = true;
+        }
+    }
+    // Trim trailing hyphen
+    if slug.ends_with('-') {
+        slug.pop();
+    }
+    slug
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn basic_slug() {
+        assert_eq!(slugify("Hello World"), "hello-world");
+    }
+
+    #[test]
+    fn unicode_slug() {
+        assert_eq!(slugify("Über die Brücke"), "uber-die-brucke");
+    }
+
+    #[test]
+    fn special_chars() {
+        assert_eq!(slugify("What's up? (2024)"), "what-s-up-2024");
+    }
+
+    #[test]
+    fn already_clean() {
+        assert_eq!(slugify("already-clean"), "already-clean");
+    }
+
+    #[test]
+    fn empty_input() {
+        assert_eq!(slugify(""), "");
+    }
+
+    #[test]
+    fn consecutive_special_chars() {
+        assert_eq!(slugify("a --- b"), "a-b");
+    }
+}