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

This is needed in some places.

3 files changed, 27 insertions, 5 deletions

diff --git a/helix-core/src/lib.rs b/helix-core/src/lib.rs
index 69294688..f697bc7f 100644
--- a/helix-core/src/lib.rs
+++ b/helix-core/src/lib.rs
@@ -116,7 +116,5 @@ pub use syntax::Syntax;
 pub use diagnostic::Diagnostic;
 pub use state::State;
 
-pub use line_ending::{
-    auto_detect_line_ending, get_line_ending, line_end_char_index, LineEnding, DEFAULT_LINE_ENDING,
-};
+pub use line_ending::{LineEnding, DEFAULT_LINE_ENDING};
 pub use transaction::{Assoc, Change, ChangeSet, Operation, Transaction};
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)
diff --git a/helix-core/src/movement.rs b/helix-core/src/movement.rs
index d0023e9f..bfceb4ef 100644
--- a/helix-core/src/movement.rs
+++ b/helix-core/src/movement.rs
@@ -7,9 +7,10 @@ use crate::{
         categorize_char, char_is_line_ending, char_is_punctuation, char_is_whitespace,
         char_is_word, CharCategory,
     },
-    coords_at_pos, get_line_ending,
+    coords_at_pos,
     graphemes::{nth_next_grapheme_boundary, nth_prev_grapheme_boundary},
-    line_end_char_index, pos_at_coords, Position, Range, RopeSlice,
+    line_ending::{get_line_ending, line_end_char_index},
+    pos_at_coords, Position, Range, RopeSlice,
 };
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]