duplicate --ignore option, refs #450

docs/cli-reference.rst

@@ -1188,6 +1188,7 @@ duplicate
       Create a duplicate of this table, copying across the schema and all row data.
 
     Options:
+      --ignore               If table does not exist, do nothing
       --load-extension TEXT  SQLite extensions to load
       -h, --help             Show this message and exit.
 

sqlite_utils/cli.py

@@ -1501,8 +1501,9 @@ def create_table(
 )
 @click.argument("table")
 @click.argument("new_table")
+@click.option("--ignore", is_flag=True, help="If table does not exist, do nothing")
 @load_extension_option
-def duplicate(path, table, new_table, load_extension):
+def duplicate(path, table, new_table, ignore, load_extension):
     """
     Create a duplicate of this table, copying across the schema and all row data.
     """
@@ -1511,7 +1512,8 @@ def duplicate(path, table, new_table, load_extension):
     try:
         db[table].duplicate(new_table)
     except NoTable:
-        raise click.ClickException('Table "{}" does not exist'.format(table))
+        if not ignore:
+            raise click.ClickException('Table "{}" does not exist'.format(table))
 
 
 @cli.command(name="drop-table")

tests/test_cli.py

@@ -2180,6 +2180,13 @@ def test_duplicate_table(tmpdir):
     )
     assert result_error.exit_code == 1
     assert result_error.output == 'Error: Table "missing" does not exist\n'
+    # And check --ignore works
+    result_error2 = CliRunner().invoke(
+        cli.cli,
+        ["duplicate", db_path, "missing", "two", "--ignore"],
+        catch_exceptions=False,
+    )
+    assert result_error2.exit_code == 0
     # Now try for a table that exists
     result = CliRunner().invoke(
         cli.cli,