Adds version CLI command (langchain-ai#12619)

Will be automatically bumped with `poetry version patch`.

@efriis @hwchase17

---------

Co-authored-by: Erick Friis <erick@langchain.dev>

libs/cli/CONTRIBUTING.md

@@ -0,0 +1,3 @@
+# Contributing to langchain-cli
+
+Update CLI versions with `poe bump` to ensure that version commands display correctly.

libs/cli/DOCS.md

@@ -9,6 +9,7 @@ $ langchain [OPTIONS] COMMAND [ARGS]...
 **Options**:
 
 * `--help`: Show this message and exit.
+* `-v, --version`: Print current CLI version.
 
 **Commands**:
 

libs/cli/langchain_cli/cli.py

@@ -6,13 +6,35 @@
 from langchain_cli.namespaces import app as app_namespace
 from langchain_cli.namespaces import template as template_namespace
 
+__version__ = "0.0.11"
+
 app = typer.Typer(no_args_is_help=True, add_completion=False)
 app.add_typer(
     template_namespace.package_cli, name="template", help=template_namespace.__doc__
 )
 app.add_typer(app_namespace.app_cli, name="app", help=app_namespace.__doc__)
 
 
+def version_callback(show_version: bool) -> None:
+    if show_version:
+        typer.echo(f"langchain-cli {__version__}")
+        raise typer.Exit()
+
+
+@app.callback()
+def main(
+    version: bool = typer.Option(
+        False,
+        "--version",
+        "-v",
+        help="Print the current CLI version.",
+        callback=version_callback,
+        is_eager=True,
+    ),
+):
+    pass
+
+
 @app.command()
 def serve(
     *,

libs/cli/pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langchain-cli"
-version = "0.0.10"
+version = "0.0.11"
 description = "CLI for interacting with LangChain"
 authors = ["Erick Friis <erick@langchain.dev>"]
 readme = "README.md"
@@ -44,9 +44,15 @@ select = [
 [tool.poe.tasks]
 test = "poetry run pytest"
 watch = "poetry run ptw"
+version = "poetry version --short"
+bump = ["_bump_1", "_bump_2"]
 lint = ["_lint", "_check_formatting"]
 format = ["_lint_fix", "_format"]
 
+_bump_2.shell = """sed -i "" "/^__version__ =/c\\ \n__version__ = \\"$version\\"\n" langchain_cli/cli.py"""
+_bump_2.uses = { version = "version" }
+
+_bump_1 = "poetry version patch"
 _check_formatting = "poetry run ruff format . --diff"
 _lint = "poetry run ruff ."
 _format = "poetry run ruff format ."