Add diff function for runbooks

Author: zph

runbook/cli/__init__.py

@@ -5,6 +5,7 @@
     check,
     convert,
     create,
+    diff,
     edit,
     export,
     init,
@@ -39,6 +40,7 @@ def cli(ctx, cwd):
 cli.add_command(create)
 cli.add_command(convert)
 cli.add_command(check)
+cli.add_command(diff)
 cli.add_command(run)
 cli.add_command(review)
 cli.add_command(version)

runbook/cli/commands/__init__.py

@@ -1,6 +1,7 @@
 from runbook.cli.commands.check import check
 from runbook.cli.commands.convert import convert
 from runbook.cli.commands.create import create
+from runbook.cli.commands.diff import diff
 from runbook.cli.commands.edit import edit
 from runbook.cli.commands.init import init
 from runbook.cli.commands.plan import plan

runbook/cli/commands/diff.py

@@ -0,0 +1,25 @@
+from os import path
+
+import click
+from runbook.cli.completions import EditableNotebook
+from runbook.cli.validators import validate_runbook_file_path
+
+@click.command()
+@click.argument(
+    "notebook_1",
+    type=EditableNotebook(file_okay=True),
+    callback=validate_runbook_file_path,
+)
+@click.argument(
+    "notebook_2",
+    type=EditableNotebook(file_okay=True),
+    callback=validate_runbook_file_path,
+)
+
+@click.pass_context
+def diff(ctx, notebook_1, notebook_2):
+    """Convert an existing runbook to different format"""
+    argv = [path.abspath(notebook_1), path.abspath(notebook_2)]
+    from nbdime import nbdiffapp
+
+    nbdiffapp.main(args=argv)