HBASE-8572 Enhance delete_snapshot.rb to call snapshot deletion API with regex

Signed-off-by: stack <stack@apache.org>

hbase-shell/src/main/ruby/hbase/admin.rb

@@ -768,6 +768,12 @@ module Hbase
       @admin.deleteSnapshot(snapshot_name.to_java_bytes)
     end
 
+    #----------------------------------------------------------------------------------------------
+    # Deletes the snapshots matching the given regex
+    def delete_all_snapshot(regex)
+      @admin.deleteSnapshots(regex).to_a
+    end
+
     #----------------------------------------------------------------------------------------------
     # Returns a list of snapshots
     def list_snapshot(regex = ".*")

hbase-shell/src/main/ruby/shell.rb

@@ -356,6 +356,7 @@ Shell.load_command_group(
     restore_snapshot
     rename_snapshot
     delete_snapshot
+    delete_all_snapshot
     list_snapshots
   ]
 )

hbase-shell/src/main/ruby/shell/commands/delete_all_snapshot.rb

@@ -0,0 +1,48 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+module Shell
+  module Commands
+    class DeleteAllSnapshot < Command
+      def help
+        return <<-EOF
+Delete all of the snapshots matching the given regex. Examples:
+
+  hbase> delete_all_snapshot 's.*'
+
+EOF
+      end
+
+      def command(regex)
+        list = admin.list_snapshot(regex)
+        count = list.size
+        list.each do |snapshot|
+          puts snapshot.name
+        end
+        puts "\nDelete the above #{count} snapshots (y/n)?" unless count == 0
+        answer = 'n'
+        answer = gets.chomp unless count == 0
+        puts "No snapshots matched the regex #{regex.to_s}" if count == 0
+        return unless answer =~ /y.*/i
+        format_simple_command do
+          admin.delete_all_snapshot(regex)
+        end
+      end
+    end
+  end
+end