completions: Complete available namespaces

Add completions for namespaces in the typelib path that can be imported.
Accepting the completion automatically adds an import statement.

blueprintcompiler/completions.py

@@ -23,7 +23,7 @@ from . import annotations, gir, language
 from .ast_utils import AstNode
 from .completions_utils import *
 from .language.types import ClassName
-from .lsp_utils import Completion, CompletionItemKind
+from .lsp_utils import Completion, CompletionItemKind, TextEdit
 from .parser import SKIP_TOKENS
 from .tokenizer import Token, TokenType
 
@@ -96,14 +96,32 @@ def using_gtk(_ctx: CompletionContext):
 )
 def namespace(ctx: CompletionContext):
     yield Completion("Gtk", CompletionItemKind.Module, text="Gtk.")
+
+    imported_namespaces = set(["Gtk"])
+
     for ns in ctx.ast_node.root.children[language.Import]:
         if ns.gir_namespace is not None:
+            imported_namespaces.add(ns.gir_namespace.name)
             yield Completion(
                 ns.gir_namespace.name,
                 CompletionItemKind.Module,
                 text=ns.gir_namespace.name + ".",
             )
 
+    for ns, version in gir.get_available_namespaces():
+        if ns not in imported_namespaces:
+            yield Completion(
+                ns,
+                CompletionItemKind.Module,
+                text=ns + ".",
+                signature=f" using {ns} {version}",
+                additional_text_edits=[
+                    TextEdit(
+                        ctx.ast_node.root.import_range(ns), f"\nusing {ns} {version};"
+                    )
+                ],
+            )
+
 
 @completer(
     applies_in=[language.UI, language.ObjectContent, language.Template],

blueprintcompiler/language/ui.py

@@ -110,16 +110,22 @@ class UI(AstNode):
             and self.template.class_name.glib_type_name == id
         )
 
-    def import_code_action(self, ns: str, version: str) -> CodeAction:
-        if len(self.children[Import]):
-            pos = self.children[Import][-1].range.end
-        else:
-            pos = self.children[GtkDirective][0].range.end
+    def import_range(self, ns: str):
+        """Returns a range to insert a new import statement"""
+        pos = self.children[GtkDirective][0].range.end
 
+        # try to insert alphabetically
+        for import_ in self.children[Import]:
+            if ns.lower() > import_.namespace.lower():
+                pos = import_.range.end
+
+        return Range(pos, pos, self.group.text)
+
+    def import_code_action(self, ns: str, version: str) -> CodeAction:
         return CodeAction(
             f"Import {ns} {version}",
             f"\nusing {ns} {version};",
-            Range(pos, pos, self.group.text),
+            self.import_range(ns),
         )
 
     @cached_property

blueprintcompiler/lsp_utils.py

@@ -87,6 +87,7 @@ class Completion:
     text: T.Optional[str] = None
     snippet: T.Optional[str] = None
     detail: T.Optional[str] = None
+    additional_text_edits: T.Optional[T.List["TextEdit"]] = None
 
     def to_json(self, snippets: bool):
         insert_text = self.text or self.label
@@ -114,6 +115,11 @@ class Completion:
             "insertText": insert_text,
             "insertTextFormat": insert_text_format,
             "detail": self.detail if self.detail else None,
+            "additionalTextEdits": (
+                [edit.to_json() for edit in self.additional_text_edits]
+                if self.additional_text_edits
+                else None
+            ),
         }
         return {k: v for k, v in result.items() if v is not None}