Tox GH Action (#286)

* first shot at some gh actions

* skip 3.9 for now

* try windows 3.7

* try an older windows

* drop travis for now (and probably ever)

* fix pypy alias

* wip a better approach for multicharacter newlines perhaps

* better test and doc for windows

* let's get some more output

* more output

* here we go with some detachment

* account for different OS lineseps

* out with the prev

* out with the prints

* clearer and more friendly atomic_save doctest

* faster ci with pip caching

* fix gh action yaml

* remove appveyor

* bit of comment cleanup

* bring windows ci in line with linux and mac

.github/workflows/tests.yaml

@@ -0,0 +1,48 @@
+name: Tests
+on:
+  push:
+    paths-ignore:
+      - 'docs/**'
+      - '*.md'
+      - '*.rst'
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - '*.md'
+      - '*.rst'
+jobs:
+  tests:
+    name: ${{ matrix.name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - {name: Linux, python: '3.8', os: ubuntu-latest, tox: py38}
+          - {name: Windows, python: '3.7', os: windows-latest, tox: py38}
+          - {name: Mac, python: '3.8', os: macos-latest, tox: py38}
+          - {name: '3.7', python: '3.7', os: ubuntu-latest, tox: py37}
+          - {name: '3.6', python: '3.6', os: ubuntu-latest, tox: py36}
+          - {name: '2.7', python: '2.7', os: ubuntu-latest, tox: py27}
+          - {name: 'PyPy2', python: 'pypy2', os: ubuntu-latest, tox: pypy}
+          - {name: 'PyPy3', python: 'pypy3', os: ubuntu-latest, tox: pypy3}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python }}
+      - name: update pip
+        run: |
+          pip install -U wheel
+          pip install -U setuptools
+          python -m pip install -U pip
+      - name: get pip cache dir
+        id: pip-cache
+        run: echo "::set-output name=dir::$(pip cache dir)"
+      - name: cache pip
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.pip-cache.outputs.dir }}
+          key: pip|${{ runner.os }}|${{ matrix.python }}|${{ hashFiles('setup.py') }}|${{ hashFiles('requirements/*.txt') }}
+      - run: pip install tox
+      - run: tox -e ${{ matrix.tox }}

.travis.yml

@@ -1,42 +0,0 @@
-language: python
-cache: pip
-
-# Python targets, as defined by https://github.com/travis-ci/travis-build/blob
-# /master/spec/build/script/python_spec.rb and https://github.com/travis-ci
-# /travis-build/blob/master/lib/travis/build/script/python.rb
-python:
-  # Standard release https://docs.travis-ci.com/user/languages
-  # /python#choosing-python-versions-to-test-against
-  - "2.7"
-  - "3.4"
-  - "3.5"
-  - "3.6"
-
-  # PyPy2.7: https://doc.pypy.org/en/latest
-  # /index-of-release-notes.html#cpython-2-7-compatible-versions
-  - pypy
-
-  # PyPy3.5: https://doc.pypy.org/en/latest
-  # /index-of-release-notes.html#cpython-3-3-compatible-versions
-  - pypy3
-
-matrix:
-  include:
-    - python: 2.6
-      dist: trusty
-    - python: 3.7
-      dist: xenial     # required for Python 3.7 (travis-ci/travis-ci#9069)
-    - python: 3.8
-      dist: xenial     # required for Python 3.8 (travis-ci/travis-ci#9069)
-    - python: 3.9
-      dist: focal
-    - python: nightly
-      dist: focal
-  allow_failures:
-    - python: nightly
-
-install: "pip install -r requirements-test.txt"
-script: "py.test --doctest-modules boltons tests"
-branches:
-  except:
-    - function_builder

appveyor.yml

@@ -1,50 +0,0 @@
-# What Python version is installed where:
-# http://www.appveyor.com/docs/installed-software#python
-
-# This configuration based on:
-# https://github.com/audreyr/cookiecutter/commit/3c4685f536afda3be93da3fe3039cec0ab0d60a3
-
-branches:
-  except:
-    - function_builder
-
-environment:
-  matrix:
-    - PYTHON: "C:\\Python27-x64"
-      TOX_ENV: "py27"
-
-    - PYTHON: "C:\\Python37-x64"
-      TOX_ENV: "py37"
-
-
-init:
-  - set PATH=%PYTHON%;%PYTHON%\Scripts;%PATH%
-  - "git config --system http.sslcainfo \"C:\\Program Files\\Git\\mingw64\\ssl\\certs\\ca-bundle.crt\""
-  - "%PYTHON%/python -V"
-  - "%PYTHON%/python -c \"import struct;print(8 * struct.calcsize(\'P\'))\""
-
-install:
-  - "%PYTHON%/Scripts/easy_install -U pip"
-  - "%PYTHON%/Scripts/pip install -U --force-reinstall tox wheel"
-
-build: false  # Not a C# project, build stuff at the test step instead.
-
-test_script:
-  - "%PYTHON%/Scripts/tox -e %TOX_ENV%"
-
-after_test:
-  - "%PYTHON%/python setup.py bdist_wheel"
-  - ps: "ls dist"
-
-on_success:
-    # Report coverage results to codecov.io
-    # and export tox environment variables
-    - "%PYTHON%/Scripts/pip install codecov"
-    - set OS=WINDOWS
-    - "%PYTHON%/Scripts/codecov -e TOX_ENV OS"
-
-artifacts:
-  - path: dist\*
-
-#on_success:
-#  - TODO: upload the content of dist/*.whl to a public wheelhouse

boltons/fileutils.py

@@ -224,10 +224,15 @@ else:
 
 def atomic_save(dest_path, **kwargs):
     """A convenient interface to the :class:`AtomicSaver` type. Example:
-    
-    >>> with atomic_save("/tmp/file.txt", text_mode=True) as fo:
-    ...     data = fo.read()
-    
+
+    >>> try:
+    ...     with atomic_save("file.txt", text_mode=True) as fo:
+    ...         _ = fo.write('bye')
+    ...         1/0  # will error
+    ...         fo.write('bye')
+    ... except ZeroDivisionError:
+    ...     pass  # at least our file.txt didn't get overwritten
+
     See the :class:`AtomicSaver` documentation for details.
     """
     return AtomicSaver(dest_path, **kwargs)

boltons/jsonutils.py

@@ -9,68 +9,80 @@ of working with `JSON Lines`_-formatted files.
 
 from __future__ import print_function
 
+import io
 import os
 import json
 
 
 DEFAULT_BLOCKSIZE = 4096
 
-# reverse iter lines algorithm:
-#
-#  - if it ends in a newline, add an empty string to the line list
-#  - if there's one item, then prepend it to the buffer, continue
-#  - if there's more than one item, pop the last item and prepend it
-#    to the buffer, yielding it
-#  - yield all remaining items in reverse, except for the first
-#  - first item becomes the new buffer
-#
-#  - when the outer loop completes, yield the buffer
-
 
 __all__ = ['JSONLIterator', 'reverse_iter_lines']
 
 
-def reverse_iter_lines(file_obj, blocksize=DEFAULT_BLOCKSIZE, preseek=True):
+def reverse_iter_lines(file_obj, blocksize=DEFAULT_BLOCKSIZE, preseek=True, encoding=None):
     """Returns an iterator over the lines from a file object, in
     reverse order, i.e., last line first, first line last. Uses the
     :meth:`file.seek` method of file objects, and is tested compatible with
     :class:`file` objects, as well as :class:`StringIO.StringIO`.
 
     Args:
-        file_obj (file): An open file object. Note that ``reverse_iter_lines``
-            mutably reads from the file and other functions should not mutably
-            interact with the file object.
-        blocksize (int): The block size to pass to :meth:`file.read()`
+        file_obj (file): An open file object. Note that
+            ``reverse_iter_lines`` mutably reads from the file and
+            other functions should not mutably interact with the file
+            object after being passed. Files can be opened in bytes or
+            text mode.
+        blocksize (int): The block size to pass to
+          :meth:`file.read()`. Warning: keep this a fairly large
+          multiple of 2, defaults to 4096.
         preseek (bool): Tells the function whether or not to automatically
             seek to the end of the file. Defaults to ``True``.
             ``preseek=False`` is useful in cases when the
             file cursor is already in position, either at the end of
             the file or in the middle for relative reverse line
             generation.
+
     """
+    # This function is a bit of a pain because it attempts to be byte/text agnostic
+    try:
+        encoding = encoding or file_obj.encoding
+    except AttributeError:
+        # BytesIO
+        encoding = None
+    else:
+        encoding = 'utf-8'
+
+    # need orig_obj to keep alive otherwise __del__ on the TextWrapper will close the file
+    orig_obj = file_obj
+    try:
+        file_obj = orig_obj.detach()
+    except (AttributeError, io.UnsupportedOperation):
+        pass
+
+    empty_bytes, newline_bytes, empty_text = b'', b'\n', u''
+
     if preseek:
         file_obj.seek(0, os.SEEK_END)
+    buff = empty_bytes
     cur_pos = file_obj.tell()
-    buff = ''
     while 0 < cur_pos:
         read_size = min(blocksize, cur_pos)
         cur_pos -= read_size
         file_obj.seek(cur_pos, os.SEEK_SET)
         cur = file_obj.read(read_size)
-        lines = cur.splitlines()
-        if cur[-1] == '\n':
-            lines.append('')
-        if len(lines) == 1:
-            buff = lines[0] + buff
+        buff = cur + buff
+        lines = buff.splitlines()
+
+        if len(lines) < 2 or lines[0] == empty_bytes:
             continue
-        last = lines.pop()
-        yield last + buff
+        if buff[-1:] == newline_bytes:
+            yield empty_text if encoding else empty_bytes
         for line in lines[:0:-1]:
-            yield line
+            yield line.decode(encoding) if encoding else line
         buff = lines[0]
     if buff:
-        # TODO: test this, does an empty buffer always mean don't yield?
-        yield buff
+        yield buff.decode(encoding) if encoding else buff
+
 
 
 """

tests/newlines_test_data.txt

@@ -3,6 +3,8 @@ b
 c
 d
 e
+
+
 f
 g
 hijklmnop

tests/test_jsonutils.py

@@ -14,14 +14,24 @@ JSONL_DATA_PATH = CUR_PATH + '/jsonl_test_data.txt'
 def _test_reverse_iter_lines(filename, blocksize=DEFAULT_BLOCKSIZE):
     fo = open(filename)
     reference = fo.read()
-    fo.seek(0, os.SEEK_END)
+    fo.seek(0, os.SEEK_SET)
     rev_lines = list(reverse_iter_lines(fo, blocksize))
     assert '\n'.join(rev_lines[::-1]) == reference
 
 
+def _test_reverse_iter_lines_bytes(filename, blocksize=DEFAULT_BLOCKSIZE):
+    fo = open(filename, 'rb')
+    reference = fo.read()
+    fo.seek(0, os.SEEK_SET)
+    rev_lines = list(reverse_iter_lines(fo, blocksize))
+    assert os.linesep.encode('ascii').join(rev_lines[::-1]) == reference
+
+
+
 def test_reverse_iter_lines():
-    for blocksize in (1, 4, 11, 4096):
+    for blocksize in (2, 4, 16, 4096):
         _test_reverse_iter_lines(NEWLINES_DATA_PATH, blocksize)
+        _test_reverse_iter_lines_bytes(NEWLINES_DATA_PATH, blocksize)
 
 
 def test_jsonl_iterator():