1 files changed, 164 insertions, 0 deletions
diff --git a/server/continuedev/models/filesystem_edit.py b/server/continuedev/models/filesystem_edit.py
new file mode 100644
index 00000000..9316ff46
--- /dev/null
+++ b/server/continuedev/models/filesystem_edit.py
@@ -0,0 +1,164 @@
+import os
+from abc import abstractmethod
+from typing import Generator, List
+
+from pydantic import BaseModel
+
+from ..libs.util.map_path import map_path
+from .main import Position, Range
+
+
+class FileSystemEdit(BaseModel):
+    @abstractmethod
+    def next_edit(self) -> Generator["FileSystemEdit", None, None]:
+        raise NotImplementedError
+
+    @abstractmethod
+    def with_mapped_paths(self, orig_root: str, copy_root: str) -> "FileSystemEdit":
+        raise NotImplementedError
+
+
+class AtomicFileSystemEdit(FileSystemEdit):
+    def next_edit(self) -> Generator["FileSystemEdit", None, None]:
+        yield self
+
+
+class FileEdit(AtomicFileSystemEdit):
+    filepath: str
+    range: Range
+    replacement: str
+
+    def with_mapped_paths(self, orig_root: str, copy_root: str) -> "FileSystemEdit":
+        return FileEdit(
+            map_path(self.filepath, orig_root, copy_root), self.range, self.replacement
+        )
+
+    @staticmethod
+    def from_deletion(filepath: str, range: Range) -> "FileEdit":
+        return FileEdit(filepath=filepath, range=range, replacement="")
+
+    @staticmethod
+    def from_insertion(filepath: str, position: Position, content: str) -> "FileEdit":
+        return FileEdit(
+            filepath=filepath,
+            range=Range.from_shorthand(
+                position.line, position.character, position.line, position.character
+            ),
+            replacement=content,
+        )
+
+    @staticmethod
+    def from_append(
+        filepath: str, previous_content: str, appended_content: str
+    ) -> "FileEdit":
+        return FileEdit(
+            filepath=filepath,
+            range=Range.from_position(Position.from_end_of_file(previous_content)),
+            replacement=appended_content,
+        )
+
+
+class FileEditWithFullContents(BaseModel):
+    fileEdit: FileEdit
+    fileContents: str
+
+
+class AddFile(AtomicFileSystemEdit):
+    filepath: str
+    content: str
+
+    def with_mapped_paths(self, orig_root: str, copy_root: str) -> "FileSystemEdit":
+        return AddFile(
+            self, map_path(self.filepath, orig_root, copy_root), self.content
+        )
+
+
+class DeleteFile(AtomicFileSystemEdit):
+    filepath: str
+
+    def with_mapped_paths(self, orig_root: str, copy_root: str) -> "FileSystemEdit":
+        return DeleteFile(map_path(self.filepath, orig_root, copy_root))
+
+
+class RenameFile(AtomicFileSystemEdit):
+    filepath: str
+    new_filepath: str
+
+    def with_mapped_paths(self, orig_root: str, copy_root: str) -> "FileSystemEdit":
+        return RenameFile(
+            map_path(self.filepath, orig_root, copy_root),
+            map_path(self.new_filepath, orig_root, copy_root),
+        )
+
+
+class AddDirectory(AtomicFileSystemEdit):
+    path: str
+
+    def with_mapped_paths(self, orig_root: str, copy_root: str) -> "FileSystemEdit":
+        return AddDirectory(map_path(self.path, orig_root, copy_root))
+
+
+class DeleteDirectory(AtomicFileSystemEdit):
+    path: str
+
+    def with_mapped_paths(self, orig_root: str, copy_root: str) -> "FileSystemEdit":
+        return DeleteDirectory(map_path(self.path, orig_root, copy_root))
+
+
+class RenameDirectory(AtomicFileSystemEdit):
+    path: str
+    new_path: str
+
+    def with_mapped_paths(self, orig_root: str, copy_root: str) -> "FileSystemEdit":
+        return RenameDirectory(
+            map_path(self.filepath, orig_root, copy_root),
+            map_path(self.new_path, orig_root, copy_root),
+        )
+
+
+class DeleteDirectoryRecursive(FileSystemEdit):
+    path: str
+
+    def with_mapped_paths(self, orig_root: str, copy_root: str) -> "FileSystemEdit":
+        return DeleteDirectoryRecursive(map_path(self.path, orig_root, copy_root))
+
+    def next_edit(self) -> Generator[FileSystemEdit, None, None]:
+        yield DeleteDirectory(path=self.path)
+        for child in os.listdir(self.path):
+            child_path = os.path.join(self.path, child)
+            if os.path.isdir(child_path):
+                yield DeleteDirectoryRecursive(path=child_path)
+            else:
+                yield DeleteFile(filepath=child_path)
+
+
+class SequentialFileSystemEdit(FileSystemEdit):
+    edits: List[FileSystemEdit]
+
+    def with_mapped_paths(self, orig_root: str, copy_root: str) -> "FileSystemEdit":
+        return SequentialFileSystemEdit(
+            [edit.with_mapped_paths(orig_root, copy_root) for edit in self.edits]
+        )
+
+    def next_edit(self) -> Generator["FileSystemEdit", None, None]:
+        for edit in self.edits:
+            yield from edit.next_edit()
+
+
+class EditDiff(BaseModel):
+    """A reversible edit that can be applied to a file."""
+
+    forward: FileSystemEdit
+    backward: FileSystemEdit
+
+    @classmethod
+    def from_sequence(cls, diffs: List["EditDiff"]) -> "EditDiff":
+        forwards = []
+        backwards = []
+        for diff in diffs:
+            forwards.append(diff.forward)
+            backwards.insert(0, diff.backward)
+        return cls(
+            forward=SequentialFileSystemEdit(edits=forwards),
+            backward=SequentialFileSystemEdit(edits=backwards),
+        )