From 67a52eca861df348384daa7bd158440352ded91b Mon Sep 17 00:00:00 2001
From: Colin <colin@uninsane.org>
Date: Thu, 13 Jul 2023 00:40:52 +0000
Subject: [PATCH] sxmo: conky: include battery estimate

---
 hosts/modules/gui/sxmo/battery_estimate | 31 +++++++++++++++++++++++++
 hosts/modules/gui/sxmo/conky-config     |  4 ++--
 hosts/modules/gui/sxmo/default.nix      | 13 ++++++++---
 3 files changed, 43 insertions(+), 5 deletions(-)
 create mode 100755 hosts/modules/gui/sxmo/battery_estimate

diff --git a/hosts/modules/gui/sxmo/battery_estimate b/hosts/modules/gui/sxmo/battery_estimate
new file mode 100755
index 00000000..0c4afc23
--- /dev/null
+++ b/hosts/modules/gui/sxmo/battery_estimate
@@ -0,0 +1,31 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash
+
+full=$(cat /sys/class/power_supply/axp20x-battery/charge_full_design)
+rate=$(cat /sys/class/power_supply/axp20x-battery/current_now)
+perc=$(cat /sys/class/power_supply/axp20x-battery/capacity)
+perc_left=$((100 - $perc))
+# these icons come from sxmo; they only render in nerdfonts
+bat_dis="󱊢"
+bat_chg="󱊥"
+
+fmt_minutes() {
+  if [[ $2 -gt 1440 ]]; then
+    echo "∞"  # more than 1d
+  else
+    hr=$(($2 / 60))
+    hr_in_min=$(($hr * 60))
+    min=$(($2 - $hr_in_min))
+    echo "$1 ${hr}h${min}m"
+  fi
+}
+
+if [[ $rate -lt 0 ]]; then
+  # discharging
+  fmt_minutes "$bat_dis" $(($full * 60 * $perc / (-100 * $rate)))
+elif [[ $rate -gt 0 ]]; then
+  # charging
+  fmt_minutes "$bat_chg" $(($full * 60 * $perc_left / (100 * $rate)))
+else
+  echo "󱊢 N/A"
+fi
diff --git a/hosts/modules/gui/sxmo/conky-config b/hosts/modules/gui/sxmo/conky-config
index 20741a63..a06ab092 100644
--- a/hosts/modules/gui/sxmo/conky-config
+++ b/hosts/modules/gui/sxmo/conky-config
@@ -17,7 +17,7 @@ ${alignc}${font Sxmo:size=50:style=Bold}${exec date +"%H"}${font Sxmo:size=50}:$
 ${font Sxmo:size=20}${exec date +"%a %d %b %Y"}${font}
 
 ${alignc}${font Sxmo:size=15}${color lightgrey}☵ $memperc%${font}
-${alignc}${font Sxmo:size=15}${color lightgrey} $cpu%${font}    
+${alignc}${font Sxmo:size=15}${color lightgrey} $cpu%${font}
 ${alignc}${font Sxmo:size=15}${color lightgrey}⇅ ${downspeedf wlan0}K/s${font}
-${alignc}${font Sxmo:size=15}${color lightgrey} ${exec echo $(( $(cat /sys/class/power_supply/axp20x-battery/charge_full_design) * -60 / $(cat /sys/class/power_supply/axp20x-battery/current_now) )) }m${font}
+${alignc}${font Sxmo:size=15}${color lightgrey}${exec @bat@ }${font}
 ]]
diff --git a/hosts/modules/gui/sxmo/default.nix b/hosts/modules/gui/sxmo/default.nix
index 538e1e33..ce570dcd 100644
--- a/hosts/modules/gui/sxmo/default.nix
+++ b/hosts/modules/gui/sxmo/default.nix
@@ -43,7 +43,7 @@
 #   - gestures:            lisgd
 #   - on-screen keyboard:  wvkbd (if wayland), svkbd (if X)
 #
-{ lib, config, pkgs, sane-lib, ... }:
+{ config, lib, pkgs, sane-lib, ... }:
 
 let
   cfg = config.sane.gui.sxmo;
@@ -217,8 +217,15 @@ in
       # sane.user.fs.".config/waybar/style.css".symlink.text =
       #   builtins.readFile ./waybar-style.css;
 
-      sane.user.fs.".config/sxmo/conky.conf".symlink.target =
-        builtins.readFile ./conky-config;
+      sane.user.fs.".config/sxmo/conky.conf".symlink.target = let
+        battery_estimate = pkgs.static-nix-shell.mkBash {
+          pname = "battery_estimate";
+          src = ./.;
+        };
+      in pkgs.substituteAll {
+        src = ./conky-config;
+        bat = "${battery_estimate}/bin/battery_estimate";
+      };
 
       ## greeter