Refactoring

README.md

@@ -6,13 +6,13 @@
 Inspired by `lf` and `ranger` file managers, written in python.
 
 It is lightweight (~400 lines of code) and easy to customize.
-Supports keyboard navigation and mouse navigation could be enabled (set MOUSE_ENABLED=True in a line #68).
+Supports keyboard navigation and mouse navigation could be enabled (set MOUSE_ENABLED=True in a line #69).
 
 ## Key bindings
 
 ### For kubectl
 
-You can customize these bindings or add extra bindings in `KEY_BINDINGS` variable of `kls` in a line #15:
+You can customize these bindings or add extra bindings in `KEY_BINDINGS` variable of `kls` in a line #14:
 
 - `Ctrl+y` - get **Y**aml of resource
 - `Ctrl+d` - **D**escribe resource

diagrams/another_dot_diagram.dot

@@ -0,0 +1,63 @@
+digraph state_machine {
+    // Graph styling
+    rankdir=TB;
+    compound=true;
+    node [shape=record, style=filled, fillcolor=lightblue, fontsize=10];
+    edge [fontsize=9];
+
+    // States with entry/exit/activities
+    Normal [label="{Normal State|Entry: None\l\
+Activities:\l\
+• Wait for key input\l\
+• Handle state-independent navigation\l\
+Exit: None\l}"];
+
+    EmptyFilter [label="{EmptyFilter State|Entry: draw_footer(menu, '/')\l\
+Activities:\l\
+• Wait for key input\l\
+• Handle state-independent navigation\l\
+• Monitor for filter input\l\
+Exit: None\l}"];
+
+    FilledFilter [label="{FilledFilter State|Entry:\l\
+• Update filtered_rows\l\
+• Draw menu or footer with filter\l\
+Activities:\l\
+• Process filter input\l\
+• Update filtered_rows on changes\l\
+• Update display if visibility changes\l\
+• Handle state-independent navigation\l\
+Exit:\l\
+• Clear filter (on ESC)\l\
+• Update filtered_rows\l\
+• Update display\l}"];
+
+    // Exit node
+    exit [shape=doublecircle, fillcolor=lightpink, label="Exit\n(SELECTED_MENU = None)"];
+
+    // Initial state indicator
+    start [shape=point, fillcolor=black];
+    start -> Normal;
+
+    // Transitions
+    Normal -> EmptyFilter [label="/ (slash)\nAction: Initialize empty filter"];
+    Normal -> exit [label="ESC\nAction: Clear selection"];
+
+    EmptyFilter -> Normal [label="ESC\nAction: draw_footer('')"];
+    EmptyFilter -> FilledFilter [label="alnum or -\nActions:\n• Add char to filter\n• Create filtered_rows\n• Update display"];
+
+    FilledFilter -> Normal [label="ESC\nActions:\n• Clear filter\n• Reset filtered_rows\n• Update display"];
+    FilledFilter -> EmptyFilter [label="BACKSPACE\n(when filter empty)\nAction: draw_footer('/')"];
+    FilledFilter -> FilledFilter [label="alnum or -\nActions:\n• Add char to filter\n• Update filtered_rows\n• Update display"];
+
+    // State-independent actions note
+    subgraph cluster_notes {
+        label="Notes";
+        style=filled;
+        fillcolor=lightyellow;
+        node [style=filled, fillcolor=white];
+        note1 [label="State-Independent Actions:\n• Vertical/Horizontal navigation\n• Available in all states\n• Handled by handle_state_independent_input()"];
+        note2 [label="Display Updates:\n• draw_menu_with_filter()\n- Called when visible rows change\n• draw_footer()\n- Called for filter updates"];
+        note3 [label="Filtering:\n• Uses CircularList for row management\n• Filters are case-insensitive\n• Supports alphanumeric and '-' chars"];
+    }
+}

diagrams/draft.dot

@@ -0,0 +1,21 @@
+digraph {
+    newrank=true;
+    subgraph cluster_menu_states {
+        label="Menu States"
+        color=lightgrey;
+        style=filled;
+        node [style=filled,color=white];
+        Normal -> EmptyFilter [label = "S"];
+        EmptyFilter -> FilledFilter [label = "A"];
+        EmptyFilter -> Normal [label = "E"];
+        FilledFilter:ne -> Normal:se [label = "E"];
+        FilledFilter -> EmptyFilter [label = "B"];
+        FilledFilter:s -> FilledFilter:s [label = "B"];
+        FilledFilter:e -> FilledFilter:e [label = "A"];
+        FilledFilter:w -> FilledFilter:w [label = "V"];
+        EmptyFilter:w -> EmptyFilter:w [label = "V"];
+        Normal:w -> Normal:w [label = "V"];
+    }
+    { rank=same; Normal; Exit; }
+    Normal -> Exit [label = "E"];
+}

diagrams/menu_lifecycle.dot

@@ -0,0 +1,57 @@
+digraph fsm {
+
+    // Create states cluster for l1, l2, l3
+    subgraph cluster_states {
+rankdir="LR"
+        label = "States";
+        style=filled;
+		color=lightgrey;
+		node [style=filled,color=white];
+
+        l1 [label = "Normal state"];
+        l2 [label = "Filter state\n(empty filter)"];
+        l3 [label = "Filter state\n(non-empty filter)"];
+    }
+
+    // Other nodes
+    exit [label = "Exit"];
+    i1 [label = "Other menu"];
+    e1 [label = "External program"];
+
+
+    // Transitions
+    l1 -> exit [label = "E"];
+
+    // Mode switches
+    l1 -> l2 [label = "S"];
+    l2 -> l3 [label = "A"];
+    l2 -> l1 [label = "E"];
+    l3 -> l1 [label = "E"];
+    l3 -> l2 [label = "B"];
+
+    // Horizontal navigation
+    l1 -> i1 [label = "H"];
+    l2 -> i1 [label = "H"];
+    l3 -> i1 [label = "H"];
+
+    // External program
+    l1 -> e1 [label = "K"];
+    l2 -> e1 [label = "K"];
+    l3 -> e1 [label = "K"];
+
+    // Self-loops
+    l1 -> l1 [label = "V"];
+    l2 -> l2 [label = "V"];
+    l3 -> l3 [label = "V"];
+    l3 -> l3 [label = "A"];
+    l3 -> l3 [label = "B"];
+
+    label = "Keys:\n\
+S - Slash (start filter)                   \l\
+E - Escape                                 \l\
+A - Type text                              \l\
+B - Backspace                              \l\
+H - Horizontal navigation (Right,Left,Tab) \l\
+V - Vertical navigation (Up, Down)         \l\
+K - Key binding                            \l"
+}

kls

@@ -1,84 +1,86 @@
 #!/usr/bin/env python3
-from typing import Optional, Callable
+from typing import Optional, Callable, Self
 import subprocess
 import curses
 import curses.ascii
 import asyncio
-
+from enum import Enum, auto
 
 SCREEN: curses.window = curses.initscr()
 
-
 # ****************************** #
 # START OF CONFIGURATION SECTION #
 # ****************************** #
 KEY_BINDINGS: dict[str, dict[str, str]] = {  # can be extended
     "^Y": {  # Ctrl + y
         "description": "Yaml",
-        "command": 'kubectl -n {namespace} get {api_resource} {resource} -o yaml | batcat -l yaml'
+        "command": "kubectl -n {namespace} get {api_resource} {resource} -o yaml | batcat -l yaml",
+        "kind": "all",  # this key binding is valid for all api resources
     },
     "^D": {  # Ctrl + d
         "description": "Describe",
-        "command": 'kubectl -n {namespace} describe {api_resource} {resource} | batcat -l yaml'
+        "command": "kubectl -n {namespace} describe {api_resource} {resource} | batcat -l yaml",
+        "kind": "all",
     },
     "^E": {  # Ctrl + e
         "description": "Edit",
-        "command": 'kubectl -n {namespace} edit {api_resource} {resource}'
+        "command": "kubectl -n {namespace} edit {api_resource} {resource}",
+        "kind": "all",
     },
     "^L": {  # Ctrl + l
         "description": "Logs",
-        "command": 'kubectl -n {namespace} logs {resource} | lnav'
+        "command": "kubectl -n {namespace} logs {resource} | lnav",
+        "kind": "pods",  # this key binding is valid for pods only
     },
     "^X": {  # Ctrl + x
         "description": "eXec",
-        "command": 'kubectl -n {namespace} exec -it {resource} sh'
+        "command": "kubectl -n {namespace} exec -it {resource} sh",
+        "kind": "pods",
     },
     "^N": {  # Ctrl + n
         "description": "Network debug",
-        "command": 'kubectl -n {namespace} debug {resource} -it --image=nicolaka/netshoot'
+        "command": "kubectl -n {namespace} debug {resource} -it --image=nicolaka/netshoot",
+        "kind": "pods",
     },
     "^A": {  # Ctrl + a  (a means Access logs! :-))
         "description": "istio-proxy Access logs",
-        "command": 'kubectl -n {namespace} logs {resource} -c istio-proxy | lnav'
+        "command": "kubectl -n {namespace} logs {resource} -c istio-proxy | lnav",
+        "kind": "pods",
     },
     "^P": {  # Ctrl + p  (p means Proxy! :-))
         "description": "exec istio-Proxy",
-        "command": 'kubectl -n {namespace} exec -it {resource} -c istio-proxy bash'
+        "command": "kubectl -n {namespace} exec -it {resource} -c istio-proxy bash",
+        "kind": "pods",
     },
     "^R": {  # Ctrl + r  (r means Reveal! :-))
         "description": "Reveal secret",
-        "command": "kubectl get secret {resource} -n {namespace} -o yaml | yq '.data |= with_entries(.value |= @base64d)' -y | batcat -l yaml"
+        "command": "kubectl get secret {resource} -n {namespace} -o yaml"
+        " | yq '.data |= with_entries(.value |= @base64d)' -y | batcat -l yaml",
+        "kind": "secrets",
     },
     "Delete": {  # It is actually KEY_DC
         "description": "Delete",
-        "command": 'kubectl -n {namespace} delete {api_resource} {resource}'
+        "command": "kubectl -n {namespace} delete {api_resource} {resource}",
-    }
+        "kind": "all",
+    },
 }
 
-# which api resources are on the top of menu?
-TOP_API_RESOURCES: list[str] = [
-    "pods", "services", "configmaps", "secrets", "persistentvolumeclaims",
-    "ingresses", "nodes", "deployments", "statefulsets", "daemonsets",
-    "storageclasses", "serviceentries", "destinationrules", "authorizationpolicies",
-    "virtualservices", "gateways", "telemetry", "envoyfilters"
-]
-
-QUERY_API_RESOURCES: bool = False  # Should we merge TOP_API_RESOURCES with all other api resources from cluster?
 BATCAT_STYLE: str = " --paging always --style numbers"  # style of batcat
+SELECTED_ROW_STYLE = curses.A_REVERSE | curses.A_BOLD
 MOUSE_ENABLED: bool = False
 WIDTH: int = curses.COLS
-WIDTH_UNIT: int = int(WIDTH / 8)
+WIDTH_UNIT: int = int(WIDTH / 10)
+CONTEXTS_WIDTH = int(WIDTH_UNIT * 1.5)
 NAMESPACES_WIDTH = int(WIDTH_UNIT * 1.5)
 API_RESOURCES_WIDTH = int(WIDTH_UNIT * 1.5)
-RESOURCES_WIDTH = WIDTH - (API_RESOURCES_WIDTH + NAMESPACES_WIDTH)
+RESOURCES_WIDTH = WIDTH - (CONTEXTS_WIDTH + NAMESPACES_WIDTH + API_RESOURCES_WIDTH)
 HEADER_HEIGHT: int = 4
 FOOTER_HEIGHT: int = 3
 ROWS_HEIGHT: int = curses.LINES - HEADER_HEIGHT - FOOTER_HEIGHT - 3
 # Generate HELP_TEXT from KEY_BINDINGS
 HELP_TEXT: str = ", ".join(f"{key}: {binding['description']}" for key, binding in KEY_BINDINGS.items())
-HELP_TEXT += ", /: filter mode, Esc: exit filter mode or kls, arrows/TAB/PgUp/PgDn: navigation"
+HELP_TEXT += ", /: filter mode, Esc: exit filter mode or kls, arrows/TAB: navigation"
-SELECTED_ROW_STYLE = curses.A_REVERSE | curses.A_BOLD
+
-ALLOWED_SPECIAL_KEYS = list(KEY_BINDINGS.keys()) + ["KEY_DC", "/", "\x1b", "KEY_BACKSPACE", "\x08", "KEY_MOUSE", "KEY_UP", "KEY_DOWN", "KEY_NPAGE", "KEY_PPAGE", "KEY_HOME", "KEY_END", "\t", "KEY_RIGHT", "KEY_BTAB", "KEY_LEFT"]
 
 # **************************** #
 # END OF CONFIGURATION SECTION #
@@ -86,41 +88,106 @@ ALLOWED_SPECIAL_KEYS = list(KEY_BINDINGS.keys()) + ["KEY_DC", "/", "\x1b", "KEY_
 
 
 class CircularList:
-    def __init__(self, elements: list[str]):
+    def __init__(self, items: list[str]):
-        self.elements: list[str] = elements
+        self.items: list[str] = items
-        self.size: int = len(elements)
+        self.size: int = len(items)
         self.index: int = 0
 
     def __getitem__(self, index: slice) -> list[str]:
         start, stop, step = index.indices(self.size)
-        return [self.elements[(self.index + i) % self.size] for i in range(start, stop, step)]
+        return [self.items[(self.index + i) % self.size] for i in range(start, stop, step)]
 
     def shift(self, steps: int) -> None:
         self.index = (self.index + steps) % self.size
 
 
+class MenuState(Enum):
+    NORMAL = auto()
+    EMPTY_FILTER = auto()
+    FILLED_FILTER = auto()
+
+
 class Menu:
-    def __init__(self, title: str, rows: list[str], begin_x: int|float, width: int|float, rows_height: int):
+    selected = None  # Class variable to track selected object
+
+    def __init__(
+        self,
+        title: str,
+        rows: list[str],
+        begin_x: int,
+        width: int,
+    ):
         self.title: str = title
         self.rows: list[str] = rows
         self.filter: str = ""
-        self.filter_mode: bool = False
+        self.state: MenuState = MenuState.NORMAL
         self.filtered_rows: CircularList = CircularList([x for x in self.rows if self.filter in x])
-        self.visible_rows: Callable[[], list[str]] = lambda: self.filtered_rows[:rows_height]
+        self.visible_rows: Callable[[], list[str]] = lambda: self.filtered_rows[:ROWS_HEIGHT]
         self.visible_row_index: int = 0
-        self.selected_row: Callable[[], Optional[str]] = lambda: self.visible_rows()[
+        self.selected_row: Callable[[], Optional[str]] = (
-            self.visible_row_index] if self.visible_rows() else None
+            lambda: self.visible_rows()[self.visible_row_index] if self.visible_rows() else None
-        self.rows_height: int = rows_height
+        )
         self.width: int = int(width)
         self.begin_x: int = int(begin_x)
         self.win: curses.window = curses.newwin(curses.LINES - FOOTER_HEIGHT, self.width, 0, self.begin_x)
+        self.dependent_menus: list[Self] = []
+
+    def refresh_filtered_rows(self):
+        self.filtered_rows = CircularList([x for x in self.rows if self.filter in x])
+
+    async def set_state(self, state: MenuState) -> None:
+        self.state = state
+        # entry activities
+        match self.state:
+            case MenuState.NORMAL:
+                self.filter = ""
+                self.draw_menu_or_footer("")
+                await self.refresh_dependent_menus()
+            case MenuState.EMPTY_FILTER:
+                self.filter = ""
+                self.draw_menu_or_footer("/")
+                await self.refresh_dependent_menus()
+            case MenuState.FILLED_FILTER:
+                self.draw_menu_or_footer(f"/{self.filter}")  # if redrawing whole menu is not needed
+                await self.refresh_dependent_menus()
+
+    def draw_rows(self) -> None:
+        for index, row in enumerate(self.visible_rows()):
+            draw_row(self.win, row, index + HEADER_HEIGHT, 2, selected=row == self.selected_row())
+
+    def draw_menu_with_footer(self) -> None:
+        self.win.erase()
+        draw_row(self.win, self.title, 1, 2, selected=self == Menu.selected)
+        self.draw_rows()
+        draw_row(
+            self.win,
+            f"/{self.filter}" if self.state in [MenuState.EMPTY_FILTER, MenuState.FILLED_FILTER] else "",
+            curses.LINES - FOOTER_HEIGHT - 2,
+            2,
+        )
+
+    def draw_menu_or_footer(self, footer_text: str) -> None:
+        previous_visible_rows = self.visible_rows()
+        self.refresh_filtered_rows()
+        if self.visible_rows() != previous_visible_rows:  # draw whole menu
+            self.visible_row_index = 0
+            self.draw_menu_with_footer()
+            self.refresh_dependent_menus()
+        else:  # draw footer only
+            draw_row(self.win, footer_text, curses.LINES - FOOTER_HEIGHT - 2, 2)
+
+    def set_dependent_menus(self, menus: list[Self]) -> None:
+        self.dependent_menus = menus
+
+    async def refresh_dependent_menus(self):
+        for menu in self.dependent_menus:
+            await refresh_menu(menu)
 
 
 # Global variables
-THIRD_MENU_LOCK: asyncio.Lock = asyncio.Lock()
+FOURTH_MENU_LOCK: asyncio.Lock = asyncio.Lock()
-THIRD_MENU_TASK: Optional[asyncio.Task] = None
+FOURTH_MENU_TASK: Optional[asyncio.Task] = None
-menus: list[Menu] = []
+MENUS: list[Menu] = []
-selected_menu: Optional[Menu] = None
 
 
 def draw_row(window: curses.window, text: str, y: int, x: int, selected: bool = False) -> None:
@@ -129,274 +196,66 @@ def draw_row(window: curses.window, text: str, y: int, x: int, selected: bool =
     window.refresh()
 
 
-def draw_rows(menu: Menu) -> None:
+async def refresh_menu(menu: Menu) -> None:
-    for index, row in enumerate(menu.visible_rows()):
+    if menu == MENUS[1]:
-        draw_row(menu.win, row, index + HEADER_HEIGHT, 2, selected = row == menu.selected_row())
+        menu.rows = await get_namespaces()
+    elif menu == MENUS[2]:
+        menu.rows = await get_api_resources()
+    menu.refresh_filtered_rows()
+    menu.visible_row_index = 0
+    menu.draw_menu_with_footer()
 
 
-def draw_menu(menu: Menu) -> None:
+async def refresh_resources_menu(namespace: Optional[str], api_resource: Optional[str]) -> None:
-    menu.win.erase()
-    draw_row(menu.win, menu.title, 1, 2, selected = menu == selected_menu)
-    draw_rows(menu)
-    draw_row(menu.win, f"/{menu.filter}" if menu.filter_mode else "", curses.LINES - FOOTER_HEIGHT - 2, 2)
-
-
-async def refresh_third_menu(namespace: Optional[str], api_resource: Optional[str]) -> None:
-    global THIRD_MENU_TASK
     try:
-        async with THIRD_MENU_LOCK:
+        async with FOURTH_MENU_LOCK:
-            menu = menus[2]
+            menu = MENUS[3]
             previous_menu_rows = menu.rows
             if api_resource and namespace:
                 try:
                     menu.rows = await kubectl_async(
-                        f"-n {namespace} get {api_resource} --no-headers --ignore-not-found")
+                        f"-n {namespace} get {api_resource} --no-headers --ignore-not-found --sort-by='{{.metadata.name}}'"
+                    )
                 except subprocess.CalledProcessError:
                     menu.rows = []
             else:
                 menu.rows = []
             index_before_update = menu.filtered_rows.index
-            menu.filtered_rows = CircularList([x for x in menu.rows if menu.filter in x])
+            menu.refresh_filtered_rows()
             menu.filtered_rows.index = index_before_update
             if menu.visible_row_index >= len(menu.visible_rows()):
                 menu.visible_row_index = 0
             if previous_menu_rows != menu.rows:
-                draw_menu(menu)
+                menu.draw_menu_with_footer()
     except asyncio.CancelledError:
         raise
 
 
-async def handle_key_bindings(key: str, namespace: str, api_resource: str, resource: str) -> None:
+async def get_contexts() -> list[str]:
-    if not resource:
-        return
-    if key in ("l", "x", "n") and api_resource != "pods":
-        return
-    if key == "KEY_DC":
-        key = "Delete"
-    if THIRD_MENU_TASK is not None:
-        THIRD_MENU_TASK.cancel()
     try:
-            await THIRD_MENU_TASK
+        current_context = await kubectl_async("config current-context")
-        except asyncio.CancelledError:
+        contexts = await kubectl_async("config get-contexts --no-headers -o name")
+        contexts.remove(current_context[0])
+        contexts.insert(0, current_context[0])
+        return [line.split()[0] for line in contexts if line.strip()]
+    except subprocess.CalledProcessError:
+        return []
+
+
+async def switch_context(context: str) -> None:
+    if not context:
+        return
+    try:
+        await kubectl_async(f"config use-context {context}")
+    except subprocess.CalledProcessError:
         pass
-    async with THIRD_MENU_LOCK:
-        curses.def_prog_mode()
-        curses.endwin()
-        command = KEY_BINDINGS[key]["command"].format(namespace=namespace, api_resource=api_resource, resource=resource)
-        if "batcat" in command:
-            command += BATCAT_STYLE
-        await subprocess_call_async(command)
-        curses.reset_prog_mode()
-        SCREEN.refresh()
-        enable_mouse_support()
 
 
-def handle_filter_state(key: str, menu: Menu) -> None:
+async def get_namespaces() -> list[str]:
-    global selected_menu
-    if key == "/" and not menu.filter_mode:
-        menu.filter_mode = True
-        menu.filter = ""
-    elif key == "\x1b":  # Escape key
-        if menu.filter_mode:
-            menu.filter_mode = False
-            menu.filter = ""
-        else:
-            selected_menu = None
-    elif menu.filter_mode:
-        if key in ["KEY_BACKSPACE", "\x08"] and menu.filter:
-            menu.filter = menu.filter[:-1]  # Remove last character
-        elif key.isalnum() or key == "-":  # Allow letters, numbers, and dashes
-            menu.filter += key.lower()
-    menu.visible_row_index = 0
-    menu.filtered_rows = CircularList([x for x in menu.rows if menu.filter in x])
-    draw_menu(menu)
-    if menu != menus[2]:
-        menus[2].visible_row_index = 0
-
-
-def handle_mouse(menu: Menu) -> None:
-    if not MOUSE_ENABLED:
-        return
-    try:
-        mouse_info: tuple[int, ...] = curses.getmouse()
-    except curses.error:  # this fixes scrolling error
-        return
-    row_number = mouse_info[2] - HEADER_HEIGHT
-    column_number = mouse_info[1]
-    next_menu: Optional[Menu] = None
-    if column_number > (menu.begin_x + menu.width):
-        next_menu = menus[(menus.index(menu) + 1) % 3]
-        if column_number > (next_menu.begin_x + next_menu.width):
-            next_menu = menus[(menus.index(next_menu) + 1) % 3]
-        globals().update(selected_menu=next_menu)
-    elif column_number < menu.begin_x:
-        next_menu = menus[(menus.index(menu) - 1) % 3]
-        if column_number < next_menu.begin_x:
-            next_menu = menus[(menus.index(next_menu) - 1) % 3]
-        globals().update(selected_menu=next_menu)
-    if next_menu:
-        draw_row(menu.win, menu.title, 1, 2, selected=False)
-        draw_row(next_menu.win, next_menu.title, 1, 2, selected=True)
-        menu = next_menu
-    char_int = menu.win.inch(mouse_info[2], column_number - menu.begin_x - 1)
-    char_str = chr(char_int & 0xFF)
-    if not char_str or ord(char_str) > 127 or ' ' in char_str:
-        return
-    if 0 <= row_number < len(menu.visible_rows()):
-        menu.visible_row_index = row_number
-        draw_rows(menu)
-        if menu != menus[2]:
-            menus[2].visible_row_index = 0
-
-
-def handle_vertical_navigation(key: str, menu: Menu) -> None:
-    if len(menu.visible_rows()) <= 1:
-        return
-    keys_numbers: dict[str, int] = {
-        "KEY_DOWN": 1, "KEY_UP": -1,
-        "KEY_NPAGE": 1, "KEY_PPAGE": -1,
-        'KEY_HOME': 0, 'KEY_END': -1
-    }
-    if key in ["KEY_DOWN", "KEY_UP"]:
-        if menu.filtered_rows.size > menu.rows_height:
-            menu.filtered_rows.shift(keys_numbers[key])
-        else:
-            menu.visible_row_index = (menu.visible_row_index + keys_numbers[key]) % menu.filtered_rows.size
-    elif key in ["KEY_NPAGE", "KEY_PPAGE"]:
-        menu.filtered_rows.shift(keys_numbers[key] * len(menu.visible_rows()))
-    elif key in ['KEY_HOME', 'KEY_END']:
-        menu.visible_row_index = keys_numbers[key]
-    draw_rows(menu)
-    if menu != menus[2]:
-        menus[2].visible_row_index = 0
-
-
-def handle_horizontal_navigation(key: str, menu: Menu) -> None:
-    increment: int = {"KEY_RIGHT": 1, "\t": 1, "KEY_LEFT": -1, "KEY_BTAB": -1}[key]
-    next_menu = menus[(menus.index(menu) + increment) % 3]
-    draw_row(menu.win, menu.title, 1, 2, selected=False)
-    draw_row(next_menu.win, next_menu.title, 1, 2, selected=True)
-    globals().update(selected_menu=next_menu)
-
-
-async def confirm_action(message: str) -> bool:
-    rows, cols = SCREEN.getmaxyx()
-    popup_height = 5
-    popup_width = len(message) + 10
-    start_y = (rows - popup_height) // 2
-    start_x = (cols - popup_width) // 2
-
-    popup = curses.newwin(popup_height, popup_width, start_y, start_x)
-    popup.box()
-    popup.addstr(2, 2, message)
-    popup.addstr(3, 2, "Press 'y' to confirm, 'n' to cancel")
-
-    popup.refresh()
-    while True:
-        key = await get_key_async(popup)
-        if key.lower() == 'y':
-            return True
-        if key.lower() == 'n':
-            popup.clear()
-            popup.refresh()
-            return False
-
-
-async def get_key_async(popup: curses.window) -> str:
-    return await asyncio.to_thread(popup.getkey)
-
-
-async def kubectl_async(command: str) -> list[str]:
-    process = await asyncio.create_subprocess_shell(
-        f"kubectl {command} 2> /dev/null",
-        stdout=asyncio.subprocess.PIPE,
-        stderr=asyncio.subprocess.PIPE
-    )
-    stdout, stderr = await process.communicate()
-    if stderr:
-        raise subprocess.CalledProcessError(process.returncode, command, stderr=stderr)
-    return stdout.decode().strip().split("\n")
-
-
-async def catch_input(menu: Menu) -> None:
-    global THIRD_MENU_TASK
-    while True:
-        try:
-            key = await get_key_async(SCREEN)
-            break
-        except curses.error:
-            if THIRD_MENU_TASK is None or THIRD_MENU_TASK.done() or THIRD_MENU_TASK.cancelled():
-                THIRD_MENU_TASK = asyncio.create_task(
-                    refresh_third_menu(
-                        menus[0].selected_row(),
-                        menus[1].selected_row()
-                    )
-                )
-            await asyncio.sleep(0.1)
-    # Convert control keys to their string representation (e.g., Ctrl+Y -> ^Y)
-    # Handle special keys (e.g., "KEY_UP", "KEY_DC")
-    if key.startswith("KEY_") or key == "\x1b":
-        key_str = key  # Use the key as-is for special keys
-    else:
-        # Handle single-character keys (e.g., "a", "^Y")
-        key_str = curses.ascii.unctrl(key) if curses.ascii.iscntrl(ord(key)) else key
-    # Check if the key is allowed
-    if key_str not in ALLOWED_SPECIAL_KEYS and not key.isalnum():
-        return  # Ignore the key if it's not in the allowed list or not alphanumeric
-    if key.isalnum() and not menu.filter_mode:
-        return
-
-    if key in ["\t", "KEY_RIGHT", "KEY_BTAB", "KEY_LEFT"]:
-        handle_horizontal_navigation(key, menu)
-    elif key in ["KEY_UP", "KEY_DOWN", "KEY_NPAGE", "KEY_PPAGE", "KEY_HOME", "KEY_END"]:
-        if THIRD_MENU_TASK is not None:
-            THIRD_MENU_TASK.cancel()
-            try:
-                await THIRD_MENU_TASK
-            except asyncio.CancelledError:
-                pass
-        handle_vertical_navigation(key, menu)
-    elif key == "KEY_MOUSE":
-        handle_mouse(menu)
-    elif key == "KEY_DC" and await confirm_action("Are you sure you want to delete this resource?"):
-        await handle_key_bindings(
-            key,
-            menus[0].selected_row(),
-            menus[1].selected_row(),
-            menus[2].selected_row() and menus[2].selected_row().split()[0]
-        )
-    elif key in ["/", "\x1b", "KEY_BACKSPACE", "\x08"] or key.isalnum() or key == "-":
-        handle_filter_state(key, menu)
-    elif key != "KEY_DC" and curses.ascii.unctrl(key) in KEY_BINDINGS:
-        await handle_key_bindings(
-            curses.ascii.unctrl(key),
-            menus[0].selected_row(),
-            menus[1].selected_row(),
-            menus[2].selected_row() and menus[2].selected_row().split()[0]
-        )
-
-
-async def subprocess_call_async(command: str) -> None:
-    process = await asyncio.create_subprocess_shell(command)
-    await process.communicate()
-
-
-def enable_mouse_support() -> None:
-    if MOUSE_ENABLED:
-        curses.mousemask(curses.REPORT_MOUSE_POSITION)
-        print('\033[?1003h')
-
-
-async def init_menus() -> None:
-    global menus, selected_menu
-    api_resources_kubectl: list[str] = [
-        x.split()[0] for x in await kubectl_async("api-resources --no-headers --verbs=get")
-    ]
-    api_resources = list(
-        dict.fromkeys(TOP_API_RESOURCES + api_resources_kubectl)
-    ) if QUERY_API_RESOURCES else TOP_API_RESOURCES
-
     namespaces: list[str] = []
+    context = MENUS[0].selected_row() and MENUS[0].selected_row().split()[0]
+    if not context:
+        return namespaces
     try:
         namespaces = await kubectl_async("config view --minify --output 'jsonpath={..namespace}'")
     except:
@@ -412,14 +271,186 @@ async def init_menus() -> None:
                 namespaces = all_namespaces
     except:
         pass
+    return namespaces
 
-    menus = [
-        Menu("Namespaces", namespaces, 0, NAMESPACES_WIDTH, ROWS_HEIGHT),
-        Menu("API resources", api_resources, NAMESPACES_WIDTH, API_RESOURCES_WIDTH, ROWS_HEIGHT),
-        Menu("Resources", [], NAMESPACES_WIDTH + API_RESOURCES_WIDTH, RESOURCES_WIDTH, ROWS_HEIGHT)
-    ]
-    selected_menu = menus[0]
 
+async def get_api_resources() -> list[str]:
+    try:
+        api_resources = await kubectl_async("api-resources --no-headers --verbs=get")
+        return sorted(list(set([x.split()[0] for x in api_resources])))  # dedup
+    except subprocess.CalledProcessError:
+        return []
+
+
+async def handle_key_bindings(key: str) -> None:
+    api_resource = MENUS[2].selected_row()
+    if KEY_BINDINGS[key]["kind"] != api_resource and KEY_BINDINGS[key]["kind"] != "all":
+        return
+    resource = MENUS[3].selected_row() and MENUS[3].selected_row().split()[0]
+    if not resource:
+        return
+    namespace = MENUS[1].selected_row()
+    if key == "KEY_DC":
+        key = "Delete"
+    await cancel_resources_refreshing()
+    async with FOURTH_MENU_LOCK:
+        curses.def_prog_mode()
+        curses.endwin()
+        command = KEY_BINDINGS[key]["command"].format(namespace=namespace, api_resource=api_resource, resource=resource)
+        if "batcat" in command:
+            command += BATCAT_STYLE
+        await subprocess_call_async(command)
+        curses.reset_prog_mode()
+        SCREEN.refresh()
+        enable_mouse_support()
+
+
+def handle_mouse(menu: Menu) -> None:
+    if not MOUSE_ENABLED:
+        return
+    try:
+        mouse_info: tuple[int, ...] = curses.getmouse()
+    except curses.error:  # this fixes scrolling error
+        return
+    row_number = mouse_info[2] - HEADER_HEIGHT
+    column_number = mouse_info[1]
+    next_menu: Optional[Menu] = None
+    if column_number > (menu.begin_x + menu.width):
+        next_menu = MENUS[(MENUS.index(menu) + 1) % MENUS.__len__()]
+        if column_number > (next_menu.begin_x + next_menu.width):
+            next_menu = MENUS[(MENUS.index(next_menu) + 1) % MENUS.__len__()]
+        Menu.selected = next_menu
+    elif column_number < menu.begin_x:
+        next_menu = MENUS[(MENUS.index(menu) - 1) % MENUS.__len__()]
+        if column_number < next_menu.begin_x:
+            next_menu = MENUS[(MENUS.index(next_menu) - 1) % MENUS.__len__()]
+        Menu.selected = next_menu
+    if next_menu:
+        draw_row(menu.win, menu.title, 1, 2, selected=False)
+        draw_row(next_menu.win, next_menu.title, 1, 2, selected=True)
+        menu = next_menu
+    char_int = menu.win.inch(mouse_info[2], column_number - menu.begin_x - 1)
+    char_str = chr(char_int & 0xFF)
+    if not char_str or ord(char_str) > 127 or " " in char_str:
+        return
+    if 0 <= row_number < len(menu.visible_rows()):
+        menu.visible_row_index = row_number
+        menu.draw_rows()
+        menu.refresh_dependent_menus()
+
+
+async def move_selection_vertically(key: str, menu: Menu) -> None:
+    if len(menu.visible_rows()) <= 1:
+        return
+    keys_numbers: dict[str, int] = {"KEY_DOWN": 1, "KEY_UP": -1}
+    if menu.filtered_rows.size > ROWS_HEIGHT:
+        menu.filtered_rows.shift(keys_numbers[key])
+    else:
+        menu.visible_row_index = (menu.visible_row_index + keys_numbers[key]) % menu.filtered_rows.size
+    menu.draw_rows()
+
+
+def move_selection_horizontally(key: str, menu: Menu) -> None:
+    increment: int = {"KEY_RIGHT": 1, "\t": 1, "KEY_LEFT": -1, "KEY_BTAB": -1}[key]
+    next_menu = MENUS[(MENUS.index(menu) + increment) % MENUS.__len__()]
+    draw_row(menu.win, menu.title, 1, 2, selected=False)
+    draw_row(next_menu.win, next_menu.title, 1, 2, selected=True)
+    Menu.selected = next_menu
+
+
+def confirm_action(message: str) -> bool:
+    rows, cols = SCREEN.getmaxyx()
+    popup_height = 5
+    popup_width = len(message) + 10
+    start_y = (rows - popup_height) // 2
+    start_x = (cols - popup_width) // 2
+
+    popup = curses.newwin(popup_height, popup_width, start_y, start_x)
+    popup.box()
+    popup.addstr(2, 2, message)
+    popup.addstr(3, 2, "Press 'y' to confirm, 'n' to cancel")
+
+    popup.refresh()
+    while True:
+        key = popup.getkey()
+        if key.lower() == "y":
+            confirm = True
+        elif key.lower() == "n":
+            confirm = False
+        else:
+            continue
+        popup.clear()
+        popup.refresh()
+        return confirm
+
+
+async def cancel_resources_refreshing() -> None:
+    if not (FOURTH_MENU_TASK is None or FOURTH_MENU_TASK.done()):
+        FOURTH_MENU_TASK.cancel()
+        try:
+            await FOURTH_MENU_TASK
+        except asyncio.CancelledError:
+            pass
+
+
+async def kubectl_async(command: str) -> list[str]:
+    process = await asyncio.create_subprocess_shell(
+        f"kubectl {command}",
+        stdout=asyncio.subprocess.PIPE,
+        stderr=asyncio.subprocess.PIPE,
+    )
+    stdout, stderr = await process.communicate()
+    if stderr:
+        raise subprocess.CalledProcessError(process.returncode, command, stderr=stderr)
+    return stdout.decode().strip().split("\n")
+
+
+async def handle_state_independent_input(menu: Menu, key: str) -> None:
+    if key in ["KEY_UP", "KEY_DOWN"]:  # V (Vertical navigation)
+        if len(menu.visible_rows()) > 1:
+            await cancel_resources_refreshing()
+            await move_selection_vertically(key, menu)
+            if menu == MENUS[0]:
+                await switch_context(menu.selected_row())
+            await menu.refresh_dependent_menus()
+    elif key in ["\t", "KEY_RIGHT", "KEY_BTAB", "KEY_LEFT"]:  # H (Vertical navigation)
+        move_selection_horizontally(key, menu)
+    elif key == "KEY_MOUSE":
+        handle_mouse(menu)
+    elif key == "KEY_DC":
+        if not MENUS[3].selected_row():
+            return
+        if confirm_action("Are you sure you want to delete this resource?"):
+            await handle_key_bindings(key)
+    elif not key.startswith("KEY_") and curses.ascii.unctrl(key) in KEY_BINDINGS:  # K (Key Bindings)
+        await handle_key_bindings(curses.ascii.unctrl(key))
+
+
+async def subprocess_call_async(command: str) -> None:
+    process = await asyncio.create_subprocess_shell(command)
+    await process.communicate()
+
+
+def enable_mouse_support() -> None:
+    curses.mousemask(curses.ALL_MOUSE_EVENTS | curses.REPORT_MOUSE_POSITION)
+    if MOUSE_ENABLED:
+        print("\033[?1003h")
+
+
+async def init_menus() -> list[Menu]:
+    MENUS.append(Menu("Contexts", await get_contexts(), 0, CONTEXTS_WIDTH))
+    MENUS.append(Menu("Namespaces", await get_namespaces(), CONTEXTS_WIDTH, NAMESPACES_WIDTH))
+    MENUS.append(
+        Menu("API resources", await get_api_resources(), CONTEXTS_WIDTH + NAMESPACES_WIDTH, API_RESOURCES_WIDTH)
+    )
+    MENUS.append(Menu("Resources", [], CONTEXTS_WIDTH + NAMESPACES_WIDTH + API_RESOURCES_WIDTH, RESOURCES_WIDTH))
+    return MENUS
+
+
+async def main_async() -> None:
+    global MENUS, FOURTH_MENU_TASK
+    MENUS = await init_menus()
+    Menu.selected = MENUS[0]
     SCREEN.refresh()
     SCREEN.nodelay(True)
     SCREEN.keypad(True)
@@ -428,18 +459,56 @@ async def init_menus() -> None:
     curses.use_default_colors()
     curses.noecho()
     enable_mouse_support()
-
+    for index, menu in enumerate(MENUS):
-
+        menu.draw_menu_with_footer()
-async def main_async() -> None:
+        menu.set_dependent_menus(MENUS[index + 1 :])
-    await init_menus()
+    draw_row(curses.newwin(3, curses.COLS, curses.LINES - FOOTER_HEIGHT, 0), HELP_TEXT, 1, 2)
-    for menu in menus:
+    while True:
-        draw_menu(menu)
+        menu = Menu.selected
-    draw_row(
+        try:
-        curses.newwin(3, curses.COLS, curses.LINES - FOOTER_HEIGHT, 0),
+            key = SCREEN.getkey()
-        HELP_TEXT, 1, 2
+        except curses.error:
+            if FOURTH_MENU_TASK is None or FOURTH_MENU_TASK.done():
+                FOURTH_MENU_TASK = asyncio.create_task(
+                    refresh_resources_menu(MENUS[1].selected_row(), MENUS[2].selected_row())
                 )
-    while selected_menu:
+            await asyncio.sleep(0.01)
-        await catch_input(selected_menu)
+            continue
+
+        # handle state-dependent keys
+        match menu.state:
+            case MenuState.NORMAL:
+                if key == "\x1b":  # E (Escape)
+                    break  # Exit
+                elif key == "/":  # S (Slash)
+                    await menu.set_state(MenuState.EMPTY_FILTER)  # Transition to EmptyFilter state
+                    continue
+            case MenuState.EMPTY_FILTER:
+                if key == "\x1b":  # E (Escape)
+                    await menu.set_state(MenuState.NORMAL)  # Transition to Normal state
+                    continue
+                elif key.isalnum() or key == "-":  # A (Type text)
+                    menu.filter += key.lower()
+                    await menu.set_state(MenuState.FILLED_FILTER)  # Transition to FilledFilter state
+                    continue
+            case MenuState.FILLED_FILTER:  # FilledFilter state
+                if key == "\x1b":  # E (Escape)
+                    await menu.set_state(MenuState.NORMAL)  # Transition to Normal state
+                    continue
+                elif key in ["KEY_BACKSPACE", "\x08"]:  # B (Backspace)
+                    if len(menu.filter) == 1:
+                        await menu.set_state(MenuState.EMPTY_FILTER)  # Transition to EmptyFilter state
+                        continue
+                    menu.filter = menu.filter[:-1]
+                    menu.draw_menu_or_footer(f"/{menu.filter}")
+                    continue
+                elif key.isalnum() or key == "-":  # A (Type text)
+                    menu.filter += key.lower()  # Stay in FilledFilter state
+                    menu.draw_menu_or_footer(f"/{menu.filter}")
+                    continue
+
+        # handle state-independent keys (Vertical/Horizontal navigation etc. available in all states)
+        await handle_state_independent_input(menu, key)
 
 
 def main(screen: curses.window) -> None:

tests/manual_tests.txt

@@ -0,0 +1,2 @@
+1. Test all key bindings on pods, services and secrets
+2. Test filters