feat: relative numbers (#485)

* feat(helix-view): configuring line-number

* feat(helix-term): relative line numbers

* feat(helix-term): passing editor::Config to render

* fix(helix-view): remove LineNumber::None

* feat(helix-term): rendering line-number according to configuration

* fix(term): put calculating current line above line iteration

* fix: add abs_diff function

* deps: cargo update

* fix: pass config argument

1 files changed, 13 insertions, 0 deletions

diff --git a/helix-view/src/editor.rs b/helix-view/src/editor.rs
index 413b7913..32f5fe86 100644
--- a/helix-view/src/editor.rs
+++ b/helix-view/src/editor.rs
@@ -33,16 +33,29 @@ pub struct Config {
     pub scroll_lines: isize,
     /// Mouse support. Defaults to true.
     pub mouse: bool,
+    /// Line number mode.
+    pub line_number: LineNumber,
     /// Middle click paste support. Defaults to true
     pub middle_click_paste: bool,
 }
 
+#[derive(Debug, Clone, PartialEq, Eq, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub enum LineNumber {
+    /// Show absolute line number
+    Absolute,
+
+    /// Show relative line number to the primary cursor
+    Relative,
+}
+
 impl Default for Config {
     fn default() -> Self {
         Self {
             scrolloff: 5,
             scroll_lines: 3,
             mouse: true,
+            line_number: LineNumber::Absolute,
             middle_click_paste: true,
         }
     }