Feature: Truncate inlay hint label

LSP.sublime-settings

@@ -180,6 +180,9 @@
    // or a custom keybinding.
   "show_inlay_hints": false,
 
+  // Truncate limit for inlay hints. Truncates and adds an ellipsis at the end.
+  "inlay_hints_truncate_limit": 100,
+
   // Highlighting style of "highlights": accentuating nearby text entities that
   // are related to the one under your cursor.
   // Valid values are "background", "underline", "stippled", "outline", or "".

plugin/core/types.py

@@ -227,6 +227,7 @@ class Settings:
     show_code_actions = cast(str, None)
     show_code_lens = cast(str, None)
     show_inlay_hints = cast(bool, None)
+    inlay_hints_truncate_limit = cast(int, None)
     show_diagnostics_in_hover = cast(bool, None)
     show_code_actions_in_hover = cast(bool, None)
     show_diagnostics_annotations_severity_level = cast(int, None)
@@ -272,6 +273,7 @@ def r(name: str, default: bool | int | str | list | dict) -> None:
         r("show_code_actions", "annotation")
         r("show_code_lens", "annotation")
         r("show_inlay_hints", False)
+        r("inlay_hints_truncate_limit", 100)
         r("show_diagnostics_in_hover", True)
         r("show_code_actions_in_hover", True)
         r("show_diagnostics_annotations_severity_level", 0)

plugin/inlay_hint.py

@@ -124,6 +124,9 @@ def format_inlay_hint_tooltip(tooltip: str | MarkupContent | None) -> str:
 
 
 def format_inlay_hint_label(inlay_hint: InlayHint, session: Session, phantom_uuid: str) -> str:
+    truncate_limit = userprefs().inlay_hints_truncate_limit
+    truncated = False
+
     tooltip = format_inlay_hint_tooltip(inlay_hint.get("tooltip"))
     result = ""
     can_resolve_inlay_hint = session.has_capability('inlayHintProvider.resolveProvider')
@@ -142,12 +145,21 @@ def format_inlay_hint_label(inlay_hint: InlayHint, session: Session, phantom_uui
             })
             result += f'<a href="{inlay_hint_click_command}">'
         instruction_text = '\nDouble-click to insert' if has_text_edits else ""
-        result += f'<span title="{(tooltip + instruction_text).strip()}">{html.escape(label)}</span>'
+        truncated = len(label) >= truncate_limit and truncate_limit > 0
+        truncated_label = label[:truncate_limit] + '…' if truncated else label
+        result_tooltip = (tooltip + instruction_text).strip()
+        result += f'<span title="{result_tooltip}">{html.escape(truncated_label)}</span>'
         if is_clickable:
             result += "</a>"
+        if truncated:
+            truncation_tooltip = html.escape(label)
+            result = f"<span title=\"{truncation_tooltip}\">{result}</span>"
         return result
 
+    remaining_truncate_limit = truncate_limit
     for label_part in label:
+        if remaining_truncate_limit <= 0 and truncate_limit > 0:
+            break
         value = ""
         tooltip = format_inlay_hint_tooltip(label_part.get("tooltip"))
         has_command = bool(label_part.get('command'))
@@ -162,10 +174,18 @@ def format_inlay_hint_label(inlay_hint: InlayHint, session: Session, phantom_uui
                 }
             })
             value += f'<a href="{inlay_hint_click_command}">'
-        value += html.escape(label_part['value'])
+        raw_label = label_part['value']
+        truncated = len(raw_label) >= remaining_truncate_limit and truncate_limit > 0
+        truncated_label = raw_label[:remaining_truncate_limit] + '…' if truncated else raw_label
+        remaining_truncate_limit -= len(raw_label)
+        value += html.escape(truncated_label)
         if has_command:
             value += "</a>"
         # InlayHintLabelPart.location is not supported
         instruction_text = '\nDouble-click to execute' if has_command else ""
         result += f"<span title=\"{(tooltip + instruction_text).strip()}\">{value}</span>"
+    if truncated:
+        tooltip_label = "".join(label_part['value'] for label_part in label)
+        truncation_tooltip = html.escape(tooltip_label)
+        result = f"<span title=\"{truncation_tooltip}\">{result}</span>"
     return result

sublime-package.json

@@ -739,6 +739,12 @@
               "default": false,
               "markdownDescription": "Show inlay hints in the editor. Inlay hints are short annotations within the code, which show variable types or parameter names.\nThis is the default value used for new windows but can be overriden per-window using the `LSP: Toggle Inlay Hints` command from the Command Palette, Main Menu or a custom keybinding."
             },
+            "inlay_hints_truncate_limit": {
+              "type": "integer",
+              "default": 100,
+              "minimum": 0,
+              "markdownDescription": "Truncate limit for inlay hints. Truncates and adds an ellipsis at the end."
+            },
             "initially_folded": {
               "type": "array",
               "items": {