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-rw-r--r--helix-core/src/lib.rs2
-rw-r--r--helix-core/src/line_ending.rs74
2 files changed, 76 insertions, 0 deletions
diff --git a/helix-core/src/lib.rs b/helix-core/src/lib.rs
index 91d2bee0..bc25b1be 100644
--- a/helix-core/src/lib.rs
+++ b/helix-core/src/lib.rs
@@ -6,6 +6,7 @@ pub mod diagnostic;
pub mod graphemes;
pub mod history;
pub mod indent;
+pub mod line_ending;
pub mod macros;
pub mod match_brackets;
pub mod movement;
@@ -109,4 +110,5 @@ pub use syntax::Syntax;
pub use diagnostic::Diagnostic;
pub use state::State;
+pub use line_ending::{auto_detect_line_ending, default_line_ending, LineEnding};
pub use transaction::{Assoc, Change, ChangeSet, Operation, Transaction};
diff --git a/helix-core/src/line_ending.rs b/helix-core/src/line_ending.rs
new file mode 100644
index 00000000..8e9b2ec0
--- /dev/null
+++ b/helix-core/src/line_ending.rs
@@ -0,0 +1,74 @@
+use crate::{Rope, RopeGraphemes, RopeSlice};
+
+/// Represents one of the valid Unicode line endings.
+#[derive(PartialEq, Copy, Clone, Debug)]
+pub enum LineEnding {
+ Crlf, // CarriageReturn followed by LineFeed
+ LF, // U+000A -- LineFeed
+ VT, // U+000B -- VerticalTab
+ FF, // U+000C -- FormFeed
+ CR, // U+000D -- CarriageReturn
+ Nel, // U+0085 -- NextLine
+ LS, // U+2028 -- Line Separator
+ PS, // U+2029 -- ParagraphSeparator
+}
+
+pub fn rope_slice_to_line_ending(g: &RopeSlice) -> Option<LineEnding> {
+ if let Some(text) = g.as_str() {
+ str_to_line_ending(text)
+ } else if g == "\u{000D}\u{000A}" {
+ Some(LineEnding::Crlf)
+ } else {
+ // Not a line ending
+ None
+ }
+}
+
+pub fn str_to_line_ending(g: &str) -> Option<LineEnding> {
+ match g {
+ "\u{000D}\u{000A}" => Some(LineEnding::Crlf),
+ "\u{000A}" => Some(LineEnding::LF),
+ "\u{000B}" => Some(LineEnding::VT),
+ "\u{000C}" => Some(LineEnding::FF),
+ "\u{000D}" => Some(LineEnding::CR),
+ "\u{0085}" => Some(LineEnding::Nel),
+ "\u{2028}" => Some(LineEnding::LS),
+ "\u{2029}" => Some(LineEnding::PS),
+
+ // Not a line ending
+ _ => None,
+ }
+}
+
+pub fn auto_detect_line_ending(doc: &Rope) -> Option<LineEnding> {
+ // based on https://github.com/cessen/led/blob/27572c8838a1c664ee378a19358604063881cc1d/src/editor/mod.rs#L88-L162
+
+ let mut ending = None;
+ for line in doc.lines().take(1) {
+ // check first line only - unsure how sound this is
+ ending = match line.len_chars() {
+ 1 => {
+ let g = RopeGraphemes::new(line.slice((line.len_chars() - 1)..))
+ .last()
+ .unwrap();
+ rope_slice_to_line_ending(&g)
+ }
+ n if n > 1 => {
+ let g = RopeGraphemes::new(line.slice((line.len_chars() - 2)..))
+ .last()
+ .unwrap();
+ rope_slice_to_line_ending(&g)
+ }
+ _ => None,
+ }
+ }
+ ending
+}
+
+pub fn default_line_ending() -> Option<LineEnding> {
+ if cfg!(windows) {
+ Some(LineEnding::Crlf)
+ } else {
+ Some(LineEnding::LF)
+ }
+}