feat(convert): try-except conversion (#175)

crunch/command/convert.py

@@ -5,7 +5,7 @@
 import click
 
 from .. import constants
-from ..convert import extract_cells
+from ..convert import ConverterError, extract_cells
 
 
 def convert_cells_to_file(
@@ -40,11 +40,15 @@ def convert(
     python_file_path: str,
     override: bool = False,
 ):
-    with open(notebook_file_path) as fd:
-        notebook = json.load(fd)
-
-    convert_cells_to_file(
-        notebook.get("cells", []),
-        python_file_path,
-        override
-    )
+    try:
+        with open(notebook_file_path) as fd:
+            notebook = json.load(fd)
+
+        convert_cells_to_file(
+            notebook.get("cells", []),
+            python_file_path,
+            override
+        )
+    except ConverterError as error:
+        print(f"convert failed: {error}")
+        raise click.Abort()

crunch/convert.py

@@ -42,7 +42,11 @@ def strip_packages(name: str):
     return name[:index]
 
 
-class NotebookCellParseError(ValueError):
+class ConverterError(ValueError):
+    pass
+
+
+class NotebookCellParseError(ConverterError):
 
     def __init__(
         self,
@@ -59,13 +63,13 @@ def __init__(
         self.cell_source = cell_source
 
 
-class RequirementVersionParseError(ValueError):
+class RequirementVersionParseError(ConverterError):
 
     def __init__(self, message) -> None:
         super().__init__(message)
 
 
-class InconsistantLibraryVersionError(ValueError):
+class InconsistantLibraryVersionError(ConverterError):
 
     def __init__(
         self,