Progress bar for "sqlite-utils extract", closes #169

sqlite_utils/cli.py

@@ -1006,6 +1006,12 @@ def transform(
     multiple=True,
     help="Rename this column in extracted table",
 )
+@click.option(
+    "-s",
+    "--silent",
+    is_flag=True,
+    help="Don't show progress bar",
+)
 def extract(
     path,
     table,
@@ -1013,12 +1019,24 @@ def extract(
     other_table,
     fk_column,
     rename,
+    silent,
 ):
     "Extract one or more columns into a separate table"
     db = sqlite_utils.Database(path)
-    db[table].extract(
-        columns, table=other_table, fk_column=fk_column, rename=dict(rename)
+    kwargs = dict(
+        columns=columns,
+        table=other_table,
+        fk_column=fk_column,
+        rename=dict(rename),
     )
+    if silent:
+        db[table].extract(**kwargs)
+    else:
+        with click.progressbar(
+            length=db[table].count, label="Extracting columns"
+        ) as bar:
+            kwargs["progress"] = bar.update
+            db[table].extract(**kwargs)
 
 
 @cli.command(name="insert-files")