feat: implement item model and ncurses UI

src/App.py

@@ -0,0 +1,60 @@
+from .items.Folder import Folder
+from pathlib import Path
+from .UI import UI
+import curses
+
+
+class App():
+    """
+        Raise:
+            FileNotFoundError can append in __init__
+    """
+    def __init__(self, path: Path) -> None:
+        self._history = []
+        self._items = []
+        self.history.append(path)
+        self._current = Folder(path)
+        self._items = self.current.children()
+        self._UI = UI(self)
+
+    def _run(self, stdscr: curses.window) -> None:
+        curses.curs_set(0)
+        curses.start_color()
+        curses.use_default_colors()
+        curses.init_pair(1, curses.COLOR_WHITE, -1)
+        curses.init_pair(2, curses.COLOR_BLUE, -1)
+        curses.init_pair(3, curses.COLOR_CYAN, -1)
+        curses.init_pair(4, curses.COLOR_YELLOW, -1)
+        stdscr.clear()
+        while (True):
+            try:
+                self._current = Folder(self.history[-1])
+            except FileNotFoundError:
+                pass # doubt
+            stdscr.addstr(0, 0, str(self.history[-1]))
+            self.UI.render(stdscr)
+            stdscr.refresh()
+            key = stdscr.getkey()
+            self._items = self.current.children()
+            if 'q' == key:
+                break
+
+    def run(self) -> None:
+        curses.wrapper(self._run)
+
+    @property
+    def history(self) -> list:
+        return self._history
+
+    @property
+    def items(self) -> list:
+        return self._items
+
+    @property
+    def current(self) -> Folder:
+        return self._current
+
+    @property
+    def UI(self) -> UI:
+        return self._UI
+

src/UI.py

@@ -0,0 +1,36 @@
+from __future__ import annotations
+import stat
+from typing import TYPE_CHECKING
+import curses
+from .items.Symlink import Symlink
+
+if TYPE_CHECKING:
+    from .App import App
+
+
+class UI:
+    def __init__(self, app: App):
+        self._app = app
+
+    def render(self, stdscr: curses.window):
+        height, width = stdscr.getmaxyx()
+        for i in range(min(height, len(self.app.items))):
+            item = self.app.items[i]
+            name, size, perm = item.fields()
+
+            stdscr.attron(curses.color_pair(item.color_pair))
+            stdscr.addstr(i, 0, name)
+
+            if type(item) is Symlink:
+                stdscr.attron(curses.color_pair(0))
+                stdscr.addstr(i, len(name), " -> ")
+                stdscr.attron(curses.color_pair(Symlink.target_color(item.point_to)))
+                stdscr.addstr(i, len(name) + 4, str(item.point_to))
+
+            stdscr.addstr(i, int(width / 3), str(size))
+            stdscr.addstr(i, int(width / 3) * 2, stat.filemode(perm))
+            stdscr.attroff(curses.color_pair(item.color_pair))
+
+    @property
+    def app(self) -> App:
+        return self._app

src/items/AItems.py

@@ -0,0 +1,46 @@
+from abc import ABC, abstractmethod
+from pathlib import Path
+
+
+class AItem(ABC):
+    """
+    Raises:
+       FileNotFoundError: if the given path does not exist on the FS
+       PermissionError: if the process lacks permission to read the file metadata
+    """
+    def __init__(self, path: Path) -> None:
+        self._path = path
+        self.update()
+
+    COLOR = 0
+
+    def update(self) -> None:
+        self._stat = self._path.lstat()
+        self._permissions = self._stat.st_mode
+
+    def fields(self) -> tuple[str, int, int]:
+        return (self.name, self.size, self.permissions)
+
+    def __str__(self) -> str:
+        return f"{self.name}, {self.size}, {self.permissions}"
+
+    @property
+    def path(self) -> Path:
+        return self._path
+
+    @property
+    def name(self) -> str:
+        return self._path.name
+
+    @property
+    def size(self) -> int:
+        return self._stat.st_size
+
+    @property
+    def permissions(self) -> int:
+        return self._permissions
+
+    @property
+    def color_pair(self) -> int:
+        return self.COLOR
+

src/items/File.py

@@ -0,0 +1,10 @@
+from pathlib import Path
+from .AItems import AItem
+
+
+class File(AItem):
+    COLOR = 1
+
+    def __init__(self, path: Path) -> None:
+        super().__init__(path)
+

src/items/Folder.py

@@ -0,0 +1,26 @@
+from pathlib import Path
+from .AItems import AItem
+
+
+class Folder(AItem):
+    COLOR = 2
+
+    def __init__(self, path: Path) -> None:
+        super().__init__(path)
+
+    def fields(self) -> tuple[str, int, int]:
+        return (f"{self.name}/", self.size, self.permissions)
+
+    def __str__(self) -> str:
+        return f"{self.name}/, {self.size}, {self.permissions}"
+
+    def children(self) -> list[AItem]:
+        from .factory import make_item
+        items: list[AItem] = []
+        for entry in self.path.iterdir():
+            try:
+                items.append(make_item(entry))
+            except FileNotFoundError:
+                pass
+        return items
+

src/items/Symlink.py

@@ -0,0 +1,28 @@
+from pathlib import Path
+from .AItems import AItem
+from .File import File
+from .Folder import Folder
+
+class Symlink(AItem):
+    COLOR = 3
+    def __init__(self, path: Path) -> None:
+        super().__init__(path)
+        self._point_to = path.resolve()
+        if False == self._point_to.exists():
+            self._point_to = None
+
+    def __str__(self) -> str:
+        return f"{self.name} -> {'(broken)' if None == self.point_to else self.point_to.name}"
+
+    @staticmethod
+    def target_color(point_to: Path | None) -> int:
+         if point_to is None:
+             return 5
+         elif point_to.is_dir():
+             return Folder.COLOR
+         else:
+             return File.COLOR
+
+    @property
+    def point_to(self) -> Path:
+        return self._point_to

src/items/factory.py

@@ -0,0 +1,12 @@
+from .AItems import AItem
+from .File import File
+from .Folder import Folder
+from .Symlink import Symlink
+from pathlib import Path
+
+def make_item(path: Path) -> AItem:
+    if path.is_symlink():
+        return Symlink(path)
+    if path.is_file():
+        return File(path)
+    return Folder(path)

src/main.py

@@ -1,35 +1,19 @@
-import curses
-from curses import wrapper
+from .App import App
+from pathlib import Path
+import sys
 
+def main() -> int:
+    path: None | Path = None
+    try:
+        path = Path(sys.argv[1])
+    except IndexError:
+        print(f"Usage: {sys.argv[0]} <path>")
+        return 1
 
-def init_curse() -> None:
-    curses.curs_set(0)
-    curses.start_color()
-    curses.use_default_colors()
+    pyExp = App(path)
+    pyExp.run()
+    return 0
 
-    curses.init_pair(1, curses.COLOR_YELLOW, -1)   # fg, bg
-    curses.init_pair(2, curses.COLOR_CYAN, -1)
-    curses.init_pair(3, curses.COLOR_GREEN, -1)
+if __name__ == "__main__":
+    main()
 
-
-def print_folder(stdscr: curses.window, path: str) -> None:
-    stdscr.clear()
-
-    stdscr.attron(curses.color_pair(1))
-    stdscr.addstr(0, 1, path)
-    stdscr.attroff(curses.color_pair(1))
-
-    for i in range(1, 9):
-        stdscr.attron(curses.color_pair(2))
-        stdscr.addstr(i, 0, " f - a")
-        stdscr.attroff(curses.color_pair(2))
-
-
-def main(stdscr):
-    init_curse()
-    print_folder(stdscr, "/tmp")
-    stdscr.refresh()
-    stdscr.getkey()
-
-
-wrapper(main)