add statusline element to display file line endings (#3113)

* add statusline element to display file line endings

* run cargo fmt --all

* change the word *ending* from plural to singular

* support for the unicode-lines feature flag

2 files changed, 28 insertions, 3 deletions

diff --git a/helix-term/src/commands/typed.rs b/helix-term/src/commands/typed.rs
index fb03af44..d6db117e 100644
--- a/helix-term/src/commands/typed.rs
+++ b/helix-term/src/commands/typed.rs
@@ -413,12 +413,11 @@ fn set_line_ending(
 
     // Attempt to parse argument as a line ending.
     let line_ending = match arg {
-        // We check for CR first because it shares a common prefix with CRLF.
-        #[cfg(feature = "unicode-lines")]
-        arg if arg.starts_with("cr") => CR,
         arg if arg.starts_with("crlf") => Crlf,
         arg if arg.starts_with("lf") => LF,
         #[cfg(feature = "unicode-lines")]
+        arg if arg.starts_with("cr") => CR,
+        #[cfg(feature = "unicode-lines")]
         arg if arg.starts_with("ff") => FF,
         #[cfg(feature = "unicode-lines")]
         arg if arg.starts_with("nel") => Nel,
diff --git a/helix-term/src/ui/statusline.rs b/helix-term/src/ui/statusline.rs
index 895043cd..85992c60 100644
--- a/helix-term/src/ui/statusline.rs
+++ b/helix-term/src/ui/statusline.rs
@@ -138,6 +138,7 @@ where
         helix_view::editor::StatusLineElement::Spinner => render_lsp_spinner,
         helix_view::editor::StatusLineElement::FileName => render_file_name,
         helix_view::editor::StatusLineElement::FileEncoding => render_file_encoding,
+        helix_view::editor::StatusLineElement::FileLineEnding => render_file_line_ending,
         helix_view::editor::StatusLineElement::FileType => render_file_type,
         helix_view::editor::StatusLineElement::Diagnostics => render_diagnostics,
         helix_view::editor::StatusLineElement::Selections => render_selections,
@@ -280,6 +281,31 @@ where
     }
 }
 
+fn render_file_line_ending<F>(context: &mut RenderContext, write: F)
+where
+    F: Fn(&mut RenderContext, String, Option<Style>) + Copy,
+{
+    use helix_core::LineEnding::*;
+    let line_ending = match context.doc.line_ending {
+        Crlf => "CRLF",
+        LF => "LF",
+        #[cfg(feature = "unicode-lines")]
+        VT => "VT", // U+000B -- VerticalTab
+        #[cfg(feature = "unicode-lines")]
+        FF => "FF", // U+000C -- FormFeed
+        #[cfg(feature = "unicode-lines")]
+        CR => "CR", // U+000D -- CarriageReturn
+        #[cfg(feature = "unicode-lines")]
+        Nel => "NEL", // U+0085 -- NextLine
+        #[cfg(feature = "unicode-lines")]
+        LS => "LS", // U+2028 -- Line Separator
+        #[cfg(feature = "unicode-lines")]
+        PS => "PS", // U+2029 -- ParagraphSeparator
+    };
+
+    write(context, format!(" {} ", line_ending), None);
+}
+
 fn render_file_type<F>(context: &mut RenderContext, write: F)
 where
     F: Fn(&mut RenderContext, String, Option<Style>) + Copy,