Switch from Fabric to Invoke

We don't use any of the remote server features supported by Fabric, so better
to use the smaller, more modern, and Python 3 compatible Invoke.

dev-requirements.txt

@@ -1,5 +1,5 @@
 # Automate tasks
-fabric
+invoke
 
 # Build documentation
 sphinx

fabfile.py

@@ -1,63 +0,0 @@
-from fabric.api import execute, local, settings, task
-
-
-@task
-def docs():
-    local('make -C docs/ html')
-
-
-@task
-def autodocs():
-    auto(docs)
-
-
-@task
-def test(path=None):
-    path = path or 'tests/'
-    local('nosetests ' + path)
-
-
-@task
-def autotest(path=None):
-    auto(test, path=path)
-
-
-@task
-def coverage(path=None):
-    path = path or 'tests/'
-    local(
-        'nosetests --with-coverage --cover-package=mopidy '
-        '--cover-branches --cover-html ' + path)
-
-
-@task
-def autocoverage(path=None):
-    auto(coverage, path=path)
-
-
-@task
-def lint(path=None):
-    path = path or '.'
-    local('flake8 $(find %s -iname "*.py")' % path)
-
-
-@task
-def autolint(path=None):
-    auto(lint, path=path)
-
-
-def auto(task, *args, **kwargs):
-    while True:
-        local('clear')
-        with settings(warn_only=True):
-            execute(task, *args, **kwargs)
-        local(
-            'inotifywait -q -e create -e modify -e delete '
-            '--exclude ".*\.(pyc|sw.)" -r docs/ mopidy/ tests/')
-
-
-@task
-def update_authors():
-    # Keep authors in the order of appearance and use awk to filter out dupes
-    local(
-        "git log --format='- %aN <%aE>' --reverse | awk '!x[$0]++' > AUTHORS")

tasks.py

@@ -0,0 +1,50 @@
+import sys
+
+from invoke import run, task
+
+
+@task
+def docs(watch=False, warn=False):
+    if watch:
+        return watcher(docs)
+    run('make -C docs/ html', warn=warn)
+
+
+@task
+def test(path=None, coverage=False, watch=False, warn=False):
+    if watch:
+        return watcher(test)
+    path = path or 'tests/'
+    cmd = 'nosetests'
+    if coverage:
+        cmd += (
+            ' --with-coverage --cover-package=mopidy'
+            ' --cover-branches --cover-html')
+    cmd += ' %s' % path
+    run(cmd, pty=True, warn=warn)
+
+
+@task
+def lint(watch=False, warn=False):
+    if watch:
+        return watcher(lint)
+    run('flake8', warn=warn)
+
+
+@task
+def update_authors():
+    # Keep authors in the order of appearance and use awk to filter out dupes
+    run("git log --format='- %aN <%aE>' --reverse | awk '!x[$0]++' > AUTHORS")
+
+
+def watcher(task, *args, **kwargs):
+    while True:
+        run('clear')
+        kwargs['warn'] = True
+        task(*args, **kwargs)
+        try:
+            run(
+                'inotifywait -q -e create -e modify -e delete '
+                '--exclude ".*\.(pyc|sw.)" -r docs/ mopidy/ tests/')
+        except KeyboardInterrupt:
+            sys.exit()