feat: kitty status bar — CPU temp + battery (hidden when sensor absent)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

kitty/tab_bar.py

@@ -2,9 +2,11 @@
 
 Flat tab style (no powerline separators) + right-aligned status area.
 Shows user@ prefix for non-seth users.
-Status: git branch, CPU%, memory, uptime, hostname, clock.
+Status: git branch, CPU% + temp, memory, uptime, hostname, battery, clock.
+Temp and battery hide themselves when the sensor is missing (steel141 has no battery).
 """
 
+import glob
 import os
 import subprocess
 from datetime import datetime
@@ -29,11 +31,15 @@ _ICON_MEM = "\uf035b"
 _ICON_UP = "\uf0aa"
 _ICON_HOST = "\uf108"
 _ICON_CLOCK = "\uf017"
+_ICON_TEMP = "\uf2c9"
+_ICON_BAT = "\uf240"
+_ICON_CHG = "\uf0e7"
 
 # Colors
 _ORANGE = as_rgb(0xD35400)
 _BLACK = as_rgb(0x000000)
 _DIM = as_rgb(0x666666)
+_RED = as_rgb(0xFF3030)
 _TAB_BG = as_rgb(0x1A1A1A)
 _BAR_BG = as_rgb(0x0D0D0D)
 
@@ -80,6 +86,39 @@ def _get_cpu_percent() -> str:
         return "?"
 
 
+# Intel = coretemp, AMD = k10temp; temp1 is the package/Tctl sensor on both.
+# hwmon numbers move between boots, so resolve once at kitty start.
+_CPU_TEMP = next(
+    (os.path.join(os.path.dirname(n), "temp1_input")
+     for n in glob.glob("/sys/class/hwmon/hwmon*/name")
+     if open(n).read().strip() in ("coretemp", "k10temp")),
+    None,
+)
+# BAT* only: mice/keyboards also show up in power_supply as hid*/hidpp_battery*.
+_BAT = next(iter(sorted(glob.glob("/sys/class/power_supply/BAT*"))), None)
+
+
+def _get_cpu_temp() -> str:
+    try:
+        with open(_CPU_TEMP) as f:
+            return f"{int(f.read()) // 1000}\u00b0"
+    except Exception:
+        return ""
+
+
+def _get_battery() -> tuple[str, str, bool]:
+    """(icon, '60%', low) or ('', '', False) when there's no battery."""
+    try:
+        with open(f"{_BAT}/capacity") as f:
+            cap = int(f.read())
+        with open(f"{_BAT}/status") as f:
+            status = f.read().strip()
+    except Exception:
+        return "", "", False
+    on_ac = status in ("Charging", "Full", "Not charging")
+    return (_ICON_CHG if on_ac else _ICON_BAT), f"{cap}%", (not on_ac and cap <= 20)
+
+
 def _get_memory() -> str:
     try:
         info = {}
@@ -160,10 +199,17 @@ def draw_tab(
         if branch:
             cells += [(_ICON_BRANCH + " ", _ORANGE), (branch, _DIM), (sep, _DIM)]
 
-        cells += [(_ICON_CPU + " ", _ORANGE), (_get_cpu_percent(), _DIM), (sep, _DIM)]
+        cells += [(_ICON_CPU + " ", _ORANGE), (_get_cpu_percent(), _DIM)]
+        temp = _get_cpu_temp()
+        if temp:
+            cells += [(" " + _ICON_TEMP + " ", _ORANGE), (temp, _DIM)]
+        cells += [(sep, _DIM)]
         cells += [(_ICON_MEM + " ", _ORANGE), (_get_memory(), _DIM), (sep, _DIM)]
         cells += [(_ICON_UP + " ", _ORANGE), (_get_uptime(), _DIM), (sep, _DIM)]
         cells += [(_ICON_HOST + " ", _ORANGE), (_hostname, _DIM), (sep, _DIM)]
+        bat_icon, bat, low = _get_battery()
+        if bat:
+            cells += [(bat_icon + " ", _RED if low else _ORANGE), (bat, _RED if low else _DIM), (sep, _DIM)]
         cells += [(_ICON_CLOCK + " ", _ORANGE), (datetime.now().strftime("%H:%M"), _DIM), (" ", _DIM)]
 
         total_len = sum(len(t) for t, _ in cells)