Feature: Truncate inlay hint label

LSP.sublime-settings

@@ -180,6 +180,10 @@
    // or a custom keybinding.
   "show_inlay_hints": false,
 
+  // Maximum length for inlay hints. Truncates exceeding characters and adds an ellipsis.
+  // Set to 0 for unlimited length.
+  "inlay_hints_max_length": 30,
+
   // 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_max_length = 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_max_length", 30)
         r("show_diagnostics_in_hover", True)
         r("show_code_actions_in_hover", True)
         r("show_diagnostics_annotations_severity_level", 0)

plugin/inlay_hint.py

@@ -123,6 +123,7 @@ 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_max_length
     tooltip = format_inlay_hint_tooltip(inlay_hint.get("tooltip"))
     result = ""
     can_resolve_inlay_hint = session.has_capability('inlayHintProvider.resolveProvider')
@@ -140,13 +141,21 @@ def format_inlay_hint_label(inlay_hint: InlayHint, session: Session, phantom_uui
                 }
             })
             result += f'<a href="{inlay_hint_click_command}">'
+        truncated = len(label) > truncate_limit and truncate_limit > 0
+        truncated_label = label[:truncate_limit - 1] + '…' if truncated else label
         instruction_text = '\nDouble-click to insert' if has_text_edits else ""
-        result += f'<span title="{(tooltip + instruction_text).strip()}">{html.escape(label)}</span>'
+        truncation_tooltip = f'\n{html.escape(label)}' if truncated else ""
+        result_tooltip = (tooltip + instruction_text + truncation_tooltip).strip()
+        result += f'<span title="{result_tooltip}">{html.escape(truncated_label)}</span>'
         if is_clickable:
             result += "</a>"
         return result
-
+    remaining_truncate_limit = truncate_limit
+    full_label = "".join(label_part['value'] for label_part in label)
+    full_label_truncated = len(full_label) > truncate_limit and truncate_limit > 0
     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'))
@@ -161,10 +170,15 @@ 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 - 1] + '…' 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>"
+        truncation_tooltip = f'\n{html.escape(full_label)}' if full_label_truncated else ""
+        result += f"<span title=\"{(tooltip + instruction_text + truncation_tooltip).strip()}\">{value}</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_max_length": {
+              "type": "integer",
+              "default": 30,
+              "minimum": 0,
+              "markdownDescription": "Maximum length for inlay hints. Truncates exceeding characters and adds an ellipsis. Set to 0 for unlimited length."
+            },
             "initially_folded": {
               "type": "array",
               "items": {