1 files changed, 71 insertions, 0 deletions
diff --git a/apply/resolv.py b/apply/resolv.py
new file mode 100644
index 0000000..eba5ed1
--- /dev/null
+++ b/apply/resolv.py
@@ -0,0 +1,71 @@
+from pathlib import Path
+from .writer import Writer
+from .state import StateFile, FileState
+import os
+
+
+class Resolver:
+    def __init__(self,
+                 applydir,
+                 writer: Writer,
+                 state: StateFile,
+                 override: bool):
+
+        self.applydir = Path(applydir)
+        self.writer = writer
+        self.override = override
+        self.state = state
+
+    def check_location(self, path: Path) -> FileState:
+        if not path.exists():
+            return FileState.Unused
+
+        if path.is_symlink():
+            dest = Path(os.path.realpath(str(path)))
+            if Path.cwd() in dest.parents:
+                return FileState.create_owned(dest)
+
+        return FileState.Used
+
+    def check_parent(self, path: Path, packagename):
+        """
+        Check if parents exists, and if we created them mark them
+        with package name
+        """
+
+        parent = path.parent
+        exists = parent.exists()
+        if (not exists) or parent in self.state.dirs:
+            self.check_parent(parent, packagename)
+
+            # Add to state
+            self.state.add_dir(parent, packagename)
+
+            if not exists:
+                self.writer.create_dir(parent)
+
+    def do_link(self, package, ppath: Path):
+        dest = Path(self.applydir, ppath)
+        dest_state = self.check_location(dest)
+
+        if not self.override and not dest_state.can_write():
+            # Check if it's a pointer to the correct location
+            raise Exception(f"Destination {ppath} already exists")
+
+        # Save the link in the statefile
+        self.state.add_link(dest, package)
+
+        self.check_parent(dest, package)
+
+        target_abs = Path.cwd().joinpath(Path(package, ppath))
+        if dest_state == FileState.Owned \
+                and dest_state.links_to() == target_abs:
+            return
+
+        if dest_state != FileState.Unused and self.override:
+            self.writer.delete(dest)
+        self.writer.create_link(target_abs, dest)
+
+    def do_folder_link(self, package, ppath: Path) -> bool:
+        self.do_link(package, ppath)
+        return True