workspace: Improve save prompt. (#3025)

Add buffer path to the prompt.

Z-2903

Release Notes:
- Added a "Save all/Discard all" prompt when closing a pane with
multiple edited buffers.

crates/util/src/util.rs

@@ -41,6 +41,8 @@ pub fn truncate(s: &str, max_chars: usize) -> &str {
     }
 }
 
+/// Removes characters from the end of the string if it's length is greater than `max_chars` and
+/// appends "..." to the string. Returns string unchanged if it's length is smaller than max_chars.
 pub fn truncate_and_trailoff(s: &str, max_chars: usize) -> String {
     debug_assert!(max_chars >= 5);
 
@@ -51,6 +53,18 @@ pub fn truncate_and_trailoff(s: &str, max_chars: usize) -> String {
     }
 }
 
+/// Removes characters from the front of the string if it's length is greater than `max_chars` and
+/// prepends the string with "...". Returns string unchanged if it's length is smaller than max_chars.
+pub fn truncate_and_remove_front(s: &str, max_chars: usize) -> String {
+    debug_assert!(max_chars >= 5);
+
+    let truncation_ix = s.char_indices().map(|(i, _)| i).nth_back(max_chars);
+    match truncation_ix {
+        Some(length) => "…".to_string() + &s[length..],
+        None => s.to_string(),
+    }
+}
+
 pub fn post_inc<T: From<u8> + AddAssign<T> + Copy>(value: &mut T) -> T {
     let prev = *value;
     *value += T::from(1);