query: Let the user interrupt interactive queries.

This makes it easier to iterate on a query because you don't have to restart
the program and reload the books if something goes sideways.

conservancy_beancount/reports/query.py

@@ -548,8 +548,7 @@ class BQLShell(bc_query_shell.BQLShell):
         self.last_line_parsed = line
         super().run_parser(line, default_close_date)
 
-    @functools.wraps(bc_query_shell.BQLShell.on_Select, ('__doc__',))
-    def on_Select(self, statement: QueryStatement) -> None:
+    def _select(self, statement: QueryStatement) -> None:
         output_format: str = self.vars['format']
         try:
             render_func = getattr(self, f'_render_{output_format}')
@@ -587,6 +586,16 @@ class BQLShell(bc_query_shell.BQLShell):
             logger.debug("rendering query as %s", output_format)
             render_func(statement, row_types, rows)
 
+    @functools.wraps(bc_query_shell.BQLShell.on_Select, ('__doc__',))
+    def on_Select(self, statement: QueryStatement) -> None:
+        try:
+            self._select(statement)
+        except KeyboardInterrupt:
+            if self.is_interactive:
+                logger.info("interrupted")
+            else:
+                raise
+
     def _hint_TypeError(self, error: TypeError, statement: QueryStatement) -> None:
         try:
             errmsg = str(error.args[0])
@@ -653,7 +662,7 @@ class QueryODS(core.BaseODS[NamedTuple, None]):
     ])
 
     def is_empty(self) -> bool:
-        return not self.sheet.childNodes
+        return not self.document.spreadsheet.firstChild.getAttribute('name').startswith('Query ')
 
     def section_key(self, row: NamedTuple) -> None:
         return None
@@ -760,9 +769,12 @@ class QueryODS(core.BaseODS[NamedTuple, None]):
             query_string: Optional[str]=None,
     ) -> None:
         if self.is_empty():
-            self.sheet.setAttribute('name', "Query 1")
+            query_count = 1
         else:
-            self.use_sheet(f"Query {len(self.document.spreadsheet.childNodes) + 1}")
+            query_count = len(self.document.spreadsheet.childNodes) + 1
+        # We avoid using self.use_sheet() because fully building the sheet
+        # before adding it to the doc makes the query safer to interrupt.
+        self.sheet = odf.table.Table(name=f"Query {query_count}")
         for name, row_type in row_types:
             if issubclass(row_type, datetime.date):
                 col_width = 1.0
@@ -785,6 +797,10 @@ class QueryODS(core.BaseODS[NamedTuple, None]):
                 cell_func(value)
                 for cell_func, value in zip(cell_funcs, row)
             ))
+        if query_count == 1:
+            self.document.spreadsheet.childNodes[-1] = self.sheet
+        else:
+            self.document.spreadsheet.appendChild(self.sheet)
 
 
 class ReportFormat(enum.Enum):

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = conservancy_beancount
-version = 1.19.7
+version = 1.19.8
 author = Software Freedom Conservancy
 author_email = info@sfconservancy.org
 description = Plugin, library, and reports for reading Conservancy’s books