[Travis] add isort formatter

see #770

.github/PULL_REQUEST_TEMPLATE.md

@@ -12,6 +12,8 @@
 ### Checklist
 - [ ] The code change is tested and works locally.
 - [ ] Tests pass. Your PR cannot be merged unless tests pass
+- [ ] The code passes linting via
+  [isort](https://github.com/timothycrosley/isort) (import sorting) -- `isort`
 - [ ] There is no commented out code in this PR.
 - [ ] Have you followed the guidelines in our Contributing document?
 - [ ] Have you checked to ensure there aren't other open [Pull Requests](../pulls) for the same update/change?

.travis.yml

@@ -67,6 +67,11 @@ jobs:
       script:
         - black --version
         - black --check . --verbose --diff
+    - name: Lint, via Isort
+      python: 3.8
+      script:
+        - isort --version
+        - isort --check-only --diff
 
     # Python 3.6 Tests
     - name: Python 3.6 on Linux

poetry.lock

@@ -168,6 +168,25 @@ zipp = ">=0.5"
 docs = ["sphinx", "rst.linker"]
 testing = ["packaging", "importlib-resources"]
 
+[[package]]
+category = "dev"
+description = "A Python utility / library to sort Python imports."
+name = "isort"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "4.3.21"
+
+[package.dependencies]
+[package.dependencies.toml]
+optional = true
+version = "*"
+
+[package.extras]
+pipfile = ["pipreqs", "requirementslib"]
+pyproject = ["toml"]
+requirements = ["pipreqs", "pip-api"]
+xdg_home = ["appdirs (>=1.4.0)"]
+
 [[package]]
 category = "main"
 description = "Low-level, pure Python DBus protocol wrapper."
@@ -522,7 +541,7 @@ docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
 testing = ["jaraco.itertools", "func-timeout"]
 
 [metadata]
-content-hash = "17cf8d4cf5a772217160daf312f590901dea4a3f5545d003035f3fb713a70f07"
+content-hash = "02dfef7e538fa800bc9cc255eaa776ebe275afb0edb48b404458bf65b152a690"
 python-versions = ">=3.6.0, <3.9.0"
 
 [metadata.files]
@@ -623,6 +642,10 @@ importlib-metadata = [
     {file = "importlib_metadata-1.6.0-py2.py3-none-any.whl", hash = "sha256:2a688cbaa90e0cc587f1df48bdc97a6eadccdcd9c35fb3f976a09e3b5016d90f"},
     {file = "importlib_metadata-1.6.0.tar.gz", hash = "sha256:34513a8a0c4962bc66d35b359558fd8a5e10cd472d37aec5f66858addef32c1e"},
 ]
+isort = [
+    {file = "isort-4.3.21-py2.py3-none-any.whl", hash = "sha256:6e811fcb295968434526407adb8796944f1988c5b65e8139058f2014cbe100fd"},
+    {file = "isort-4.3.21.tar.gz", hash = "sha256:54da7e92468955c4fceacd0c86bd0ec997b0e1ee80d97f67c35a78b719dccab1"},
+]
 jeepney = [
     {file = "jeepney-0.4.3-py3-none-any.whl", hash = "sha256:d6c6b49683446d2407d2fe3acb7a368a77ff063f9182fe427da15d622adc24cf"},
     {file = "jeepney-0.4.3.tar.gz", hash = "sha256:3479b861cc2b6407de5188695fa1a8d57e5072d7059322469b62628869b8e36e"},

pyproject.toml

@@ -35,10 +35,19 @@ behave = "^1.2"
 mkdocs = "^1.0"
 flake8 = "^3.7"
 black = {version = "^19.10b0",allow-prereleases = true}
+isort = {version = "^4.3.21", extras = ["pyproject"]}
 
 [tool.poetry.scripts]
 jrnl = 'jrnl.cli:run'
 
+[tool.isort]
+multi_line_output = 3
+include_trailing_comma = true
+force_grid_wrap = 0
+use_parentheses = true
+line_length = 88
+known_first_party = "jrnl"
+
 [build-system]
 requires = ["poetry>=0.12"]
 build-backend = "poetry.masonry.api"