conky/battery_estimate: render h/m indicators as superscript

hosts/common/programs/conky/battery_estimate

@@ -1,3 +1,4 @@
+#!/bin/sh
 #!/usr/bin/env nix-shell
 #!nix-shell -i bash
 
@@ -14,6 +15,27 @@ usage() {
 icon_bat_chg=("󰢟" "󱊤" "󱊥" "󰂅")
 icon_bat_dis=("󰂎" "󱊡" "󱊢" "󱊣")
 
+# render time like: 2ʰ08ᵐ
+# unicode sub/super-scripts: <https://en.wikipedia.org/wiki/Unicode_subscripts_and_superscripts>
+symbol_hr="ʰ"
+symbol_min="ᵐ"
+
+# render time like: 2ₕ08ₘ
+# symbol_hr="ₕ"
+# symbol_min="ₘ"
+
+# render time like: 2h08m
+# symbol_hr="h"
+# symbol_min="m"
+
+# render time like: 2:08
+# symbol_hr=":"
+# symbol_min=
+
+# render time like: 2'08"
+# symbol_hr="'"
+# symbol_min='"'
+
 log() {
   if [ "$BATTERY_ESTIMATE_DEBUG" = "1" ]; then
     printf "$@" >&2
@@ -88,7 +110,7 @@ fmt_minutes() {
     hr=$(($3 / 60))
     hr_in_min=$(($hr * 60))
     min=$(($3 - $hr_in_min))
-    printf "%s %dh%02dm" "$1" "$hr" "$min"
+    printf "%s %d%s%02d%s" "$1" "$hr" "$symbol_hr" "$min" "$symbol_min"
   fi
 }