adding "init" command

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "poetry-slam"
-version = "0.1.0"
+version = "1.0"
 description = "An opinionated build tool for python poetry projects"
 authors = ["evilchili <evilchili@gmail.com>"]
 readme = "README.md"
@@ -20,6 +20,17 @@ pytest-cov = "^4.0.0"
 
 [tool.poetry.group.dev.dependencies]
 
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
+
+
+[tool.poetry.scripts]
+slam = "poetry_slam.cli:app"
+
+
+### SLAM
+
 [tool.black]
 line-length = 120
 target-version = ['py310']
@@ -39,10 +50,4 @@ remove-duplicate-keys = true         # remove all duplicate keys in objects
 remove-unused-variables = true       # remove unused variables
 
 
-[build-system]
-requires = ["poetry-core"]
-build-backend = "poetry.core.masonry.api"
-
-
-[tool.poetry.scripts]
-slam = "poetry_slam.cli:app"
+### ENDSLAM

src/poetry_slam/build_tool.py

@@ -72,7 +72,7 @@ class BuildTool:
     def test(self, args) -> bool:
         old_v = self.verbose
         self.verbose = True
-        returncode = self._exec("pytest", *args)
+        returncode = self.run("pytest", *args)
         self.verbose = old_v
         return returncode
 

src/poetry_slam/cli.py

@@ -34,6 +34,32 @@ def main(
         build()
 
 
+@app.command()
+def init():
+    """
+    Add opinionated defaults to your pyproject.toml.
+    """
+    defaults = Path(__file__).parent / "defaults.toml"
+    target = app_state["build_tool"].project_root / "pyproject.toml"
+    if not target.exists():
+        raise RuntimeError(f"Could not find pyproject.toml at '{target}'")
+    logger.debug(f"Checking for modifications to {target}")
+    existing = target.read_text()
+    if "### SLAM" in existing:
+        logging.info(f"Found what looks like poetry-slam modifications; stopping.")
+        print(f"Abort: It looks like poetry-slam has already modified {target}.")
+    else:
+        backup = Path(str(target) + ".slam-orig")
+        backup.write_text(existing)
+        logging.debug(f"Saved backup of {target} to {backup}")
+        new = Path(str(target) + ".slam-new")
+        new.write_text(existing + "\n\n" + defaults.read_text())
+        logging.debug(f"Wrote temporary file {new}")
+        new.rename(target)
+        logging.debug(f"Renamed {new} to {target}")
+        print(f"Added poetry-slam defaults to {target}")
+
+
 @app.command()
 def format():
     """