WIP: refactor backup

- Move functionality into the grexd module.
- Create the hugefileviewer infra that uses mmap and only reads the
  portion of the file that is on the screen.
- works

tmp

pyproject.toml

@@ -6,4 +6,5 @@ build-backend = "setuptools.build_meta"
 
 [tool.mypy]
 strict = true
-files = "src, src/bin/grexd, tests"
+scripts_are_modules = true
+files = "src, src/bin/*, tests"

setup.cfg

@@ -21,7 +21,8 @@ package_dir =
     grexd = src/grexd
 packages = find:
 scripts =
-    src/bin/grexd
+    src/bin/grexd-regexbuild
+    src/bin/grexd-hugefileviewer
 python_requires = >=3.9
 install_requires = file:requirements.txt
 

src/bin/grexd-hugefileviewer

@@ -0,0 +1,64 @@
+#!/usr/bin/env python3
+"""
+A visualizer for huge files
+
+This is mostly a test for the hugefileviewer prompt-toolkit widget and
+control.
+"""
+
+import argparse
+import logging
+import os
+
+import grexd
+from prompt_toolkit import Application
+from prompt_toolkit.key_binding import KeyBindings
+from prompt_toolkit.key_binding.key_processor import KeyPressEvent
+from prompt_toolkit.layout.containers import Container, Window
+from prompt_toolkit.layout.layout import Layout
+from prompt_toolkit.widgets import Frame
+
+E = KeyPressEvent
+
+
+class HugeFileViewerWidget:
+    def __init__(self, filename: os.PathLike[str]):
+        self.filename = filename
+        with open(self.filename, "rb") as fd:
+            self.control = grexd.HugeFileViewerUIControl(fd=fd)
+        self.window = Window(self.control)
+
+    def __pt_container__(self) -> Container:
+        return self.window
+
+
+def hugefileviewer_run(filename: os.PathLike[str]) -> None:
+    hugefileviewer = HugeFileViewerWidget(filename)
+    root_container = Frame(title=str(filename), body=hugefileviewer)
+    layout = Layout(root_container)
+    kb = KeyBindings()
+    app: Application[None] = Application(
+        layout=layout,
+        full_screen=True,
+        key_bindings=kb,
+        mouse_support=True,
+    )
+    kb.add("c-c")(lambda e: app.exit())
+    kb.add("c-d")(lambda e: app.exit())
+    kb.add("escape", "q")(lambda e: app.exit())
+    app.run()
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument(
+        "--version", "-V", action="version", version="%(prog)s " + grexd.version()
+    )
+    parser.add_argument("file", type=str, nargs=1, help="File to view")
+    args = parser.parse_args()
+    logging.basicConfig(filename="log.txt", level=logging.INFO)
+    hugefileviewer_run(args.file[0])
+
+
+if __name__ == "__main__":
+    main()