Add option to skip the first indent guide (#3819)

* Add option to skip the first indent guide

* reorder skip_first option

* change indent-guides.skip_first to a number

* rename skip -> skip_levels

* add skip_levels to the book

* Update book/src/configuration.md

Co-authored-by: A-Walrus <58790821+A-Walrus@users.noreply.github.com>

* Update helix-term/src/ui/editor.rs

Co-authored-by: Michael Davis <mcarsondavis@gmail.com>

Co-authored-by: Robin <robinvandijk@klippa.com>
Co-authored-by: A-Walrus <58790821+A-Walrus@users.noreply.github.com>
Co-authored-by: Michael Davis <mcarsondavis@gmail.com>

book/src/configuration.md

@@ -233,10 +233,11 @@ tabpad = "·" # Tabs will look like "→···" (depending on tab width)
 
 Options for rendering vertical indent guides.
 
-| Key         | Description                                             | Default |
-| ---         | ---                                                     | ---     |
-| `render`    | Whether to render indent guides.                        | `false` |
-| `character` | Literal character to use for rendering the indent guide | `│`     |
+| Key           | Description                                             | Default |
+| ---           | ---                                                     | ---     |
+| `render`      | Whether to render indent guides.                        | `false` |
+| `character`   | Literal character to use for rendering the indent guide | `│`     |
+| `skip-levels` | Number of indent levels to skip                         | `0`     |
 
 Example:
 
@@ -244,4 +245,5 @@ Example:
 [editor.indent-guides]
 render = true
 character = "╎"
+skip-levels = 1
 ```

helix-term/src/ui/editor.rs

@@ -436,7 +436,8 @@ impl EditorView {
                 return;
             }
 
-            let starting_indent = (offset.col / tab_width) as u16;
+            let starting_indent =
+                (offset.col / tab_width) as u16 + config.indent_guides.skip_levels;
             // TODO: limit to a max indent level too. It doesn't cause visual artifacts but it would avoid some
             // extra loops if the code is deeply nested.
 

helix-view/src/editor.rs

@@ -552,15 +552,17 @@ impl Default for WhitespaceCharacters {
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
-#[serde(default)]
+#[serde(default, rename_all = "kebab-case")]
 pub struct IndentGuidesConfig {
     pub render: bool,
     pub character: char,
+    pub skip_levels: u16,
 }
 
 impl Default for IndentGuidesConfig {
     fn default() -> Self {
         Self {
+            skip_levels: 0,
             render: false,
             character: '│',
         }