feat: Add support for installing as a tool

docs/index.md

@@ -1,20 +1,35 @@
 # griddler
 
-Griddles are the main functionality of griddle. Read about the [griddle schema](griddles.md) to get started.
+Griddles are the main functionality of griddle. Read about the [griddle schema](griddles.md) to learn more about the format.
 
-## Using griddler from the command line
+## Getting started
 
-Griddler can also be used on the command line to read an input YAML (or JSON) and write output JSON:
+### Command-line usage
 
+Griddler can be used from the command line with any language. It reads a YAML (or JSON)
+griddle definition and writes the expanded parameter sets as JSON.
+
+You can install it from GitHub with `uv` or another git-backed package maanger:
+
+```bash
+uv tool install git+https://github.com/cdcgov/griddler.git
 ```
-python -m griddler my_griddle.yaml > my_parameter_sets.json
+
+Example usage:
+
+```bash
+griddler my_griddle.yaml > my_parameter_sets.json
 ```
 
 Use the `--help` flag for more details.
 
-## Using griddle in other python projects
+### Python API
+
+You can also directly generate a griddle directly in Python:
 
-You can generate a griddle directly in Python:
+```bash
+uv add git+https://github.com/cdcgov/griddler.git
+```
 
 ```python
 import yaml

griddler/__main__.py

@@ -7,9 +7,9 @@
 import griddler
 
 
-def main(args):
+def main(args=None):
     parser = argparse.ArgumentParser(
-        prog="python -m griddler",
+        prog="griddler",
         description="Parse a griddle into a list of dictionaries.",
     )
 
@@ -52,6 +52,11 @@ def main(args):
 
     args = parser.parse_args(args)
 
+    # Show help if no args are provided
+    if args.input is sys.stdin and sys.stdin.isatty():
+        parser.print_help()
+        sys.exit(1)
+
     if args.from_ == "yaml":
         raw = yaml.safe_load(args.input)
     elif args.from_ == "json":

pyproject.toml

@@ -23,3 +23,6 @@ dev = [
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
+
+[project.scripts]
+griddler = "griddler.__main__:main"