decompiler: Allow appending to end without newline

This will be useful for nested `lookup`s, which are parsed top to bottom
but Blueprint prints them in more human-readable bottom to top orientation.

blueprintcompiler/decompiler.py

@@ -42,6 +42,18 @@ _NAMESPACES = [
 ]
 
 
+@dataclass
+class TextFragment:
+    text: str
+    newline_after: bool = True
+    indent: bool = True
+
+
+@dataclass
+class BlockInfo:
+    terminator: T.Optional[TextFragment] = None
+
+
 class LineType(Enum):
     NONE = 1
     STMT = 2
@@ -54,7 +66,7 @@ class DecompileCtx:
         self._result: str = ""
         self.gir = GirContext()
         self._indent: int = 0
-        self._blocks_need_end: T.List[str] = []
+        self._blocks: T.List[BlockInfo] = []
         self._last_line_type: LineType = LineType.NONE
         self.template_class: T.Optional[str] = None
 
@@ -86,16 +98,17 @@ class DecompileCtx:
         return None
 
     def start_block(self) -> None:
-        self._blocks_need_end.append("")
+        self._blocks.append(BlockInfo())
 
     def end_block(self) -> None:
-        if close := self._blocks_need_end.pop():
-            self.print(close)
+        block = self._blocks.pop()
+        if terminator := block.terminator:
+            self.print(terminator.text, terminator.newline_after, terminator.indent)
 
-    def end_block_with(self, text: str) -> None:
-        self._blocks_need_end[-1] = text
+    def end_block_with(self, text: str, newline_after: bool = True, indent: bool = True) -> None:
+        self._blocks[-1].terminator = TextFragment(text, newline_after, indent)
 
-    def print(self, line: str, newline: bool = True) -> None:
+    def print(self, line: str, newline: bool = True, indent: bool = True) -> None:
         if line == "}" or line == "]":
             self._indent -= 1
 
@@ -117,13 +130,13 @@ class DecompileCtx:
                 self._result += "\n"
             self._last_line_type = line_type
 
-        self._result += ("  " * self._indent) + line
+        self._result += ("  " * self._indent * indent) + line
         if newline:
             self._result += "\n"
 
         if line.endswith("{") or line.endswith("["):
-            if len(self._blocks_need_end):
-                self._blocks_need_end[-1] = _CLOSING[line[-1]]
+            if len(self._blocks):
+                self._blocks[-1].terminator = TextFragment(_CLOSING[line[-1]])
             self._indent += 1
 
     def print_attribute(self, name: str, value: str, type: GirType) -> None: