Add some docs

README.md

@@ -9,6 +9,8 @@ Transfer your type safe Python data models to TypeScript:
 
 ![example](example.gif)
 
+See the [docs](docs.md).
+
 ## Similar projects
 
 * https://github.com/cs-cordero/py-ts-interfaces

docs.md

@@ -0,0 +1,67 @@
+# pydantic2zod
+
+Translates [pydantic](pydantic-docs.helpmanual.io/) -> [zod](zod.dev/) declarations.
+
+## Installation
+
+```sh
+pip install git+https://github.com/argyle-engineering/pydantic2zod
+```
+
+## CLI
+
+The compiler must be run within the same Python environment as your project:
+```sh
+$ cd my-project
+$ poetry run python -m pydantic2zod my_project.models
+```
+
+## As a library
+
+Translating **pydantic** declarations to **zod** out ouf the box may not work for
+more sophisticated cases. Then you can use `pydantic2zod` as a library to implement
+your own specific compiler:
+```py
+# my_project/scripts/pydantic_to_zod.py
+
+from pydantic2zod import Compiler
+
+class Compiler(pydantic2zod.Compiler)
+    ...
+
+ts_src = Compiler().parse("examples.eshop").to_zod()
+print(ts_src)
+```
+
+Now lets say we want to omit some models as they may not be relative in your TypeScript code:
+```py
+class Compiler(pydantic2zod.Compiler):
+    IGNORE_TYPES = {"examples.eshop.Order"}
+```
+
+Or we can rename others:
+```py
+class Compiler(pydantic2zod.Compiler):
+    MODEL_RENAME_RULES = {"examples.eshop.Product": "Item"}
+```
+
+We can also manually edit the models and individual fields:
+```py
+class Compiler(pydantic2zod.Compiler):
+    MODEL_RENAME_RULES = {"examples.eshop.Product": "Item"}
+
+    def _modify_models(self, pydantic_models: list[ClassDecl]) -> list[ClassDecl]:
+        for model in pydantic_models:
+            if model.name == "Item":
+                for f in model.fields:
+                    # In pydantic declarations Product.description is optional.
+                    # Lets make it required in zod.
+                    if f.name == "description":
+                        f.type = BuiltinType(name="str")
+
+        return pydantic_models
+```
+
+We could even generate new models on the fly this way.
+
+See a more complete example at `examples/compiler_scripting.py`.

examples/compiler_scripting.py

@@ -0,0 +1,26 @@
+import logging
+
+import pydantic2zod
+from pydantic2zod.model import BuiltinType, ClassDecl
+
+logging.basicConfig(level=logging.INFO)
+
+
+class Compiler(pydantic2zod.Compiler):
+    IGNORE_TYPES = {"examples.eshop.Order"}
+    MODEL_RENAME_RULES = {"examples.eshop.Product": "Item"}
+
+    def _modify_models(self, pydantic_models: list[ClassDecl]) -> list[ClassDecl]:
+        for model in pydantic_models:
+            if model.name == "Item":
+                for f in model.fields:
+                    # In pydantic declarations Product.description is optional.
+                    # Lets make it required in zod.
+                    if f.name == "description":
+                        f.type = BuiltinType(name="str")
+
+        return pydantic_models
+
+
+ts_src = Compiler().parse("examples.eshop").to_zod()
+print(ts_src)