Modernize code and add a test

tasks.py

@@ -0,0 +1,79 @@
+import os
+from pathlib import Path
+from shutil import which
+
+from invoke import task
+
+PKG_NAME = "share_post"
+PKG_PATH = Path(f"pelican/plugins/{PKG_NAME}")
+ACTIVE_VENV = os.environ.get("VIRTUAL_ENV", None)
+VENV_HOME = Path(os.environ.get("WORKON_HOME", "~/.local/share/virtualenvs"))
+VENV_PATH = Path(ACTIVE_VENV) if ACTIVE_VENV else (VENV_HOME / PKG_NAME)
+VENV = str(VENV_PATH.expanduser())
+
+TOOLS = ["poetry", "pre-commit"]
+POETRY = which("poetry") if which("poetry") else (VENV / Path("bin") / "poetry")
+PRECOMMIT = (
+    which("pre-commit") if which("pre-commit") else (VENV / Path("bin") / "pre-commit")
+)
+
+
+@task
+def tests(c):
+    """Run the test suite"""
+    c.run(f"{VENV}/bin/pytest", pty=True)
+
+
+@task
+def black(c, check=False, diff=False):
+    """Run Black auto-formatter, optionally with --check or --diff"""
+    check_flag, diff_flag = "", ""
+    if check:
+        check_flag = "--check"
+    if diff:
+        diff_flag = "--diff"
+    c.run(f"{VENV}/bin/black {check_flag} {diff_flag} {PKG_PATH} tasks.py")
+
+
+@task
+def isort(c, check=False, diff=False):
+    check_flag, diff_flag = "", ""
+    if check:
+        check_flag = "-c"
+    if diff:
+        diff_flag = "--diff"
+    c.run(f"{VENV}/bin/isort {check_flag} {diff_flag} .")
+
+
+@task
+def flake8(c):
+    c.run(f"{VENV}/bin/flake8 {PKG_PATH} tasks.py")
+
+
+@task
+def lint(c):
+    isort(c, check=True)
+    black(c, check=True)
+    flake8(c)
+
+
+@task
+def tools(c):
+    """Install tools in the virtual environment if not already on PATH"""
+    for tool in TOOLS:
+        if not which(tool):
+            c.run(f"{VENV}/bin/pip install {tool}")
+
+
+@task
+def precommit(c):
+    """Install pre-commit hooks to .git/hooks/pre-commit"""
+    c.run(f"{PRECOMMIT} install")
+
+
+@task
+def setup(c):
+    c.run(f"{VENV}/bin/pip install -U pip")
+    tools(c)
+    c.run(f"{POETRY} install")
+    precommit(c)