From 198fe409513d43bc2c38fbb148131bf8cab58d19 Mon Sep 17 00:00:00 2001
From: Nathan Vegdahl <cessen@cessen.com>
Date: Tue, 20 Jul 2021 18:40:41 -0700
Subject: [PATCH] Don't insert a final line ending on file load/reload.

---
 helix-view/src/document.rs | 27 ++++++---------------------
 1 file changed, 6 insertions(+), 21 deletions(-)

diff --git a/helix-view/src/document.rs b/helix-view/src/document.rs
index a04af94d..2f2b7479 100644
--- a/helix-view/src/document.rs
+++ b/helix-view/src/document.rs
@@ -306,19 +306,6 @@ pub async fn to_writer<'a, W: tokio::io::AsyncWriteExt + Unpin + ?Sized>(
     Ok(())
 }
 
-/// Inserts the final line ending into `rope` if it's missing. [Why?](https://stackoverflow.com/questions/729692/why-should-text-files-end-with-a-newline)
-pub fn with_line_ending(rope: &mut Rope) -> LineEnding {
-    // search for line endings
-    let line_ending = auto_detect_line_ending(rope).unwrap_or(DEFAULT_LINE_ENDING);
-
-    // add missing newline at the end of file
-    if rope.len_bytes() == 0 || !char_is_line_ending(rope.char(rope.len_chars() - 1)) {
-        rope.insert(rope.len_chars(), line_ending.as_str());
-    }
-
-    line_ending
-}
-
 /// Like std::mem::replace() except it allows the replacement value to be mapped from the
 /// original value.
 fn take_with<T, F>(mut_ref: &mut T, closure: F)
@@ -456,7 +443,7 @@ impl Document {
         theme: Option<&Theme>,
         config_loader: Option<&syntax::Loader>,
     ) -> Result<Self, Error> {
-        let (mut rope, encoding) = if path.exists() {
+        let (rope, encoding) = if path.exists() {
             let mut file =
                 std::fs::File::open(&path).context(format!("unable to open {:?}", path))?;
             from_reader(&mut file, encoding)?
@@ -465,7 +452,6 @@ impl Document {
             (Rope::from(DEFAULT_LINE_ENDING.as_str()), encoding)
         };
 
-        let line_ending = with_line_ending(&mut rope);
         let mut doc = Self::from(rope, Some(encoding));
 
         // set the path and try detecting the language
@@ -474,9 +460,9 @@ impl Document {
             doc.detect_language(theme, loader);
         }
 
-        // Detect indentation style and set line ending.
+        // Detect indentation style and line ending.
         doc.detect_indent_style();
-        doc.line_ending = line_ending;
+        doc.line_ending = auto_detect_line_ending(&doc.text).unwrap_or(DEFAULT_LINE_ENDING);
 
         Ok(doc)
     }
@@ -605,16 +591,15 @@ impl Document {
         }
 
         let mut file = std::fs::File::open(path.unwrap())?;
-        let (mut rope, ..) = from_reader(&mut file, Some(encoding))?;
-        let line_ending = with_line_ending(&mut rope);
+        let (rope, ..) = from_reader(&mut file, Some(encoding))?;
 
         let transaction = helix_core::diff::compare_ropes(self.text(), &rope);
         self.apply(&transaction, view_id);
         self.append_changes_to_history(view_id);
 
-        // Detect indentation style and set line ending.
+        // Detect indentation style and line ending.
         self.detect_indent_style();
-        self.line_ending = line_ending;
+        self.line_ending = auto_detect_line_ending(&self.text).unwrap_or(DEFAULT_LINE_ENDING);
 
         Ok(())
     }