Add function to get the line ending of a str slice.

This is needed in some places.

1 files changed, 23 insertions, 0 deletions

diff --git a/helix-core/src/line_ending.rs b/helix-core/src/line_ending.rs
index 3055c96e..19de2231 100644
--- a/helix-core/src/line_ending.rs
+++ b/helix-core/src/line_ending.rs
@@ -128,6 +128,29 @@ pub fn get_line_ending(line: &RopeSlice) -> Option<LineEnding> {
     LineEnding::from_str(g2).or_else(|| LineEnding::from_str(g1))
 }
 
+/// Returns the passed line's line ending, if any.
+pub fn get_line_ending_of_str(line: &str) -> Option<LineEnding> {
+    if line.ends_with("\u{000D}\u{000A}") {
+        Some(LineEnding::Crlf)
+    } else if line.ends_with("\u{000A}") {
+        Some(LineEnding::LF)
+    } else if line.ends_with("\u{000B}") {
+        Some(LineEnding::VT)
+    } else if line.ends_with("\u{000C}") {
+        Some(LineEnding::FF)
+    } else if line.ends_with("\u{000D}") {
+        Some(LineEnding::CR)
+    } else if line.ends_with("\u{0085}") {
+        Some(LineEnding::Nel)
+    } else if line.ends_with("\u{2028}") {
+        Some(LineEnding::LS)
+    } else if line.ends_with("\u{2029}") {
+        Some(LineEnding::PS)
+    } else {
+        None
+    }
+}
+
 /// Returns the char index of the end of the given line, not including its line ending.
 pub fn line_end_char_index(slice: &RopeSlice, line: usize) -> usize {
     slice.line_to_char(line + 1)