[Tests] Lint with pre-commit

- Add lint section to tox.
- Replace flake8 with lint on Travis and remove commented out sections.
- Remove flake8 from appveyor to reduce sequential testing time.

.travis.yml

@@ -10,6 +10,14 @@ before_install:
   - lsb_release -a
   - sudo add-apt-repository ppa:deluge-team/develop -yu
 
+addons:
+  apt:
+    sources:
+      - deadsnakes
+    packages:
+      # Need Py 3.6 specifically for pre-commit to run black formatter.
+      - python3.6
+
 # command to install dependencies
 install:
   - bash -c "echo $APTPACKAGES"
@@ -33,13 +41,9 @@ matrix:
     - env: TOX_ENV=pydef
     - if: commit_message =~ SECURITY_TEST
       env: TOX_ENV=security
-    - env: TOX_ENV=flake8
+    - env: TOX_ENV=lint
-    #- env:  TOX_ENV=flake8-complexity
     - env: TOX_ENV=docs
-    #- env: TOX_ENV=todo
-    #- env: TOX_ENV=trial              APTPACKAGES="$APTPACKAGES $APTPACKAGES_GTKUI"
     - env: TOX_ENV=pygtkui            APTPACKAGES="$APTPACKAGES $APTPACKAGES_GTKUI"
-    #- env: TOX_ENV=testcoverage       APTPACKAGES="$APTPACKAGES $APTPACKAGES_GTKUI"
     - env: TOX_ENV=plugins
 
 virtualenv:

appveyor.yml

@@ -4,7 +4,6 @@ environment:
   APPVEYOR_SAVE_CACHE_ON_ERROR: true
 
   matrix:
-    - TOXENV: flake8
     - TOXENV: pydef
     - TOXENV: pygtkui
     - TOXENV: plugins

tox.ini

@@ -4,7 +4,7 @@
 # Usage: `pip install tox` and then run `tox` from this directory.
 
 [tox]
-envlist = py27, flake8, docs
+envlist = py27, lint, docs
 minversion=2.0
 
 [base]
@@ -79,6 +79,14 @@ commands = {[testenv:pydef]commands}
 # Code linting
 # =======================
 
+[testenv:lint]
+passenv = HOMEPATH SSH_AUTH_SOCK
+deps =
+    pre-commit
+    slimit
+commands =
+    pre-commit run --all-files
+
 [testenv:flake8]
 # Disable site packages to avoid using system flake8 which uses
 # hardcoded python path which imports the wrong libraries.