Initial public release of Warp.

Repo-Sync-Origin: warpdotdev/warp-internal@12af1d983b

app/src/prefix.rs

@@ -0,0 +1,31 @@
+use std::cmp;
+
+/// Takes a slice of strings and returns a string representing the common
+/// prefix of every string in the vector
+pub fn longest_common_prefix<'a>(strings: impl IntoIterator<Item = &'a str>) -> Option<&'a str> {
+    let mut strings = strings.into_iter();
+    let first = strings.next()?;
+    let mut len = first.len();
+
+    for string in strings {
+        len = cmp::min(
+            len,
+            string
+                .chars()
+                .zip(first.chars())
+                .take_while(|(c1, c2)| c1 == c2)
+                .map(|(c, _)| c.len_utf8())
+                .sum(),
+        );
+    }
+
+    if len == 0 {
+        None
+    } else {
+        Some(&first[0..len])
+    }
+}
+
+#[cfg(test)]
+#[path = "prefix_test.rs"]
+mod tests;