add click-ified 'lint' command

tasks.py

@@ -42,5 +42,5 @@ def test():
     """Run lint commands and tests."""
     run('pip install -r {0} --ignore-installed'.format(REQUIREMENTS), echo=True)
     os.chdir(COOKIE)
-    #_run_manage_command('lint')
+    _run_manage_command('lint')
     _run_manage_command('test')

{{cookiecutter.app_name}}/{{cookiecutter.app_name}}/app.py

@@ -68,4 +68,5 @@ def register_shellcontext(app):
 
 def register_commands(app):
     """Register Click commands."""
-    app.cli.add_command(cli.test_command)
+    app.cli.add_command(cli.test)
+    app.cli.add_command(cli.lint)

{{cookiecutter.app_name}}/{{cookiecutter.app_name}}/cli.py

@@ -1,17 +1,45 @@
 # -*- coding: utf-8 -*-
 """Click commands."""
 import click
-import os
 from flask.cli import with_appcontext
+from glob import glob
+import os
+from subprocess import call
 
 HERE = os.path.abspath(os.path.dirname(__file__))
 PROJECT_ROOT = os.path.join(HERE, os.pardir)
 TEST_PATH = os.path.join(PROJECT_ROOT, 'tests')
 
 
-@click.command('test')
+@click.command()
 @with_appcontext
-def test_command():
+def test():
     """Run the tests."""
     import pytest
     pytest.main([TEST_PATH, '--verbose'])
+
+
+@click.command()
+@click.option('-f', '--fix-imports', default=False, is_flag=True,
+              help='Fix imports using isort, before linting')
+@with_appcontext
+def lint(fix_imports):
+    """Lint and check code style with flake8 and isort."""
+    skip = ['requirements']
+    root_files = glob('*.py')
+    root_directories = [
+        name for name in next(os.walk('.'))[1] if not name.startswith('.')]
+    files_and_directories = [
+        arg for arg in root_files + root_directories if arg not in skip]
+
+    def execute_tool(description, *args):
+        """Execute a checking tool with its arguments."""
+        command_line = list(args) + files_and_directories
+        click.echo('{}: {}'.format(description, ' '.join(command_line)))
+        rv = call(command_line)
+        if rv is not 0:
+            exit(rv)
+
+    if fix_imports:
+        execute_tool('Fixing import order', 'isort', '-rc')
+    execute_tool('Checking code style', 'flake8')