From e5459ab1c8fb4250f30c4663aa797e6f1de22ab3 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Mon, 3 May 2021 22:09:09 +0300
Subject: vk.tracking: merge db.io to utils.io

---
 vk/tracking/db/backend/csv.py |  5 ++--
 vk/tracking/db/format.py      |  4 +++-
 vk/tracking/db/io.py          | 56 -------------------------------------------
 vk/utils/io.py                | 27 ++++++++++++++++++---
 4 files changed, 30 insertions(+), 62 deletions(-)
 delete mode 100644 vk/tracking/db/io.py

diff --git a/vk/tracking/db/backend/csv.py b/vk/tracking/db/backend/csv.py
index 43038e4..0503872 100644
--- a/vk/tracking/db/backend/csv.py
+++ b/vk/tracking/db/backend/csv.py
@@ -3,15 +3,16 @@
 # For details, see https://github.com/egor-tensin/vk-scripts.
 # Distributed under the MIT License.
 
+from vk.utils.io import FileReaderCSV, FileWriterCSV
+
 from .. import meta
-from ..io import FileReaderCSV, FileWriterCSV
 from ..record import Record
 from ..timestamp import Timestamp
 
 
 class Writer(meta.Writer):
     def __init__(self, fd):
-        self._writer = FileWriterCSV(fd)
+        self._writer = FileWriterCSV(fd, flush=True)
 
     def on_initial_status(self, user):
         self._write_record(user)
diff --git a/vk/tracking/db/format.py b/vk/tracking/db/format.py
index 028d403..2a54f6d 100644
--- a/vk/tracking/db/format.py
+++ b/vk/tracking/db/format.py
@@ -6,7 +6,9 @@
 from enum import Enum
 import sys
 
-from . import backend, io
+from vk.utils import io
+
+from . import backend
 
 
 class Format(Enum):
diff --git a/vk/tracking/db/io.py b/vk/tracking/db/io.py
deleted file mode 100644
index a89865f..0000000
--- a/vk/tracking/db/io.py
+++ /dev/null
@@ -1,56 +0,0 @@
-# Copyright (c) 2017 Egor Tensin <Egor.Tensin@gmail.com>
-# This file is part of the "VK scripts" project.
-# For details, see https://github.com/egor-tensin/vk-scripts.
-# Distributed under the MIT License.
-
-from contextlib import contextmanager
-import csv
-import sys
-
-
-class FileWriterCSV:
-    def __init__(self, fd=sys.stdout):
-        self._fd = fd
-        self._writer = csv.writer(fd, lineterminator='\n')
-
-    @staticmethod
-    def _convert_row_old_python(row):
-        if isinstance(row, (list, tuple)):
-            return row
-        return list(row)
-
-    def write_row(self, row):
-        if sys.version_info < (3, 5):
-            row = self._convert_row_old_python(row)
-        self._writer.writerow(row)
-        self._fd.flush()
-
-
-class FileReaderCSV:
-    def __init__(self, fd=sys.stdin):
-        self._reader = csv.reader(fd)
-
-    def __iter__(self):
-        return iter(self._reader)
-
-
-@contextmanager
-def _open_file(path=None, default=None, **kwargs):
-    if path is None:
-        yield default
-    else:
-        with open(path, **kwargs) as fd:
-            yield fd
-
-
-_DEFAULT_ENCODING = 'utf-8'
-
-
-def open_output_text_file(path=None, mode='w'):
-    return _open_file(path, default=sys.stdout, mode=mode,
-                      encoding=_DEFAULT_ENCODING)
-
-
-def open_input_text_file(path=None):
-    return _open_file(path, default=sys.stdin, mode='r',
-                      encoding=_DEFAULT_ENCODING)
diff --git a/vk/utils/io.py b/vk/utils/io.py
index bb8eef9..eccb726 100644
--- a/vk/utils/io.py
+++ b/vk/utils/io.py
@@ -18,9 +18,19 @@ class FileWriterJSON:
         self._fd.write('\n')
 
 
+class FileReaderCSV:
+    def __init__(self, fd=sys.stdin):
+        self._reader = csv.reader(fd)
+
+    def __iter__(self):
+        return iter(self._reader)
+
+
 class FileWriterCSV:
-    def __init__(self, fd=sys.stdout):
+    def __init__(self, fd=sys.stdout, flush=False):
+        self._fd = fd
         self._writer = csv.writer(fd, lineterminator='\n')
+        self._flush = flush
 
     @staticmethod
     def _convert_row_old_python(row):
@@ -32,6 +42,8 @@ class FileWriterCSV:
         if sys.version_info < (3, 5):
             row = self._convert_row_old_python(row)
         self._writer.writerow(row)
+        if self._flush:
+            self._fd.flush()
 
 
 @contextmanager
@@ -43,8 +55,17 @@ def _open_file(path=None, default=None, **kwargs):
             yield fd
 
 
-def open_output_text_file(path=None):
-    return _open_file(path, default=sys.stdout, mode='w', encoding='utf-8')
+_DEFAULT_ENCODING = 'utf-8'
+
+
+def open_input_text_file(path=None):
+    return _open_file(path, default=sys.stdin, mode='r',
+                      encoding=_DEFAULT_ENCODING)
+
+
+def open_output_text_file(path=None, mode='w'):
+    return _open_file(path, default=sys.stdout, mode=mode,
+                      encoding=_DEFAULT_ENCODING)
 
 
 def open_output_binary_file(path=None):
-- 
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