From 8077357e17a25c06278c103ab8731465c3eb1dae Mon Sep 17 00:00:00 2001
From: Jim Myhrberg <contact@jimeh.me>
Date: Sat, 16 Dec 2023 00:23:06 +0000
Subject: [PATCH] docs(readme): Add some details and usage examples

---
 README.md | 123 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 122 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 85c97d2..b4c417a 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,122 @@
-# macos-battery-exporter
+<h1 align="center">
+  macos-battery-exporter
+</h1>
+
+<p align="center">
+  <strong>
+    Prometheus exporter for detailed battery metrics on macOS.
+  </strong>
+</p>
+
+<p align="center">
+  <a href="https://github.com/jimeh/macos-battery-exporter/releases"><img src="https://img.shields.io/github/v/tag/jimeh/macos-battery-exporter?label=release" alt="GitHub tag (latest SemVer)"></a>
+  <a href="https://github.com/jimeh/macos-battery-exporter/issues"><img src="https://img.shields.io/github/issues-raw/jimeh/macos-battery-exporter.svg?style=flat&logo=github&logoColor=white" alt="GitHub issues"></a>
+  <a href="https://github.com/jimeh/macos-battery-exporter/pulls"><img src="https://img.shields.io/github/issues-pr-raw/jimeh/macos-battery-exporter.svg?style=flat&logo=github&logoColor=white" alt="GitHub pull requests"></a>
+  <a href="https://github.com/jimeh/macos-battery-exporter/blob/main/LICENSE"><img src="https://img.shields.io/github/license/jimeh/macos-battery-exporter.svg?style=flat" alt="License Status"></a>
+</p>
+
+A Prometheus exporter for macOS which exposes most useful details available from
+`ioreg`. Includes a lot more details than what `node_exporter` supports via it's
+`node_power_supply_*` metrics.
+
+## Usage
+
+### Help
+
+```bash
+macos-battery-exporter -h
+```
+
+```
+Usage of bin/macos-battery-exporter:
+  -b string
+        Bind address to run server on (default "127.0.0.1")
+  -l string
+        Log level (default "info")
+  -n string
+        Namespace for metrics (default "macos")
+  -o string
+        Output file to write to in Prometheus format
+  -p int
+        Port to run server on (default 9108)
+  -s    Run as a Prometheus metrics server
+  -v    Print version and exit
+```
+
+### Print to STDOUT
+
+```bash
+macos-battery-exporter
+```
+
+```ini
+# TYPE macos_battery_cell_disconnect_count gauge
+macos_battery_cell_disconnect_count{serial="ZTMDHJEZ8JKMYVAJKU"} 0
+# HELP macos_battery_charge_rate_amps Current charge rate in Ah.
+# TYPE macos_battery_charge_rate_amps gauge
+macos_battery_charge_rate_amps{serial="ZTMDHJEZ8JKMYVAJKU"} -0.927
+# HELP macos_battery_charge_rate_watts Current charge rate in Wh.
+# TYPE macos_battery_charge_rate_watts gauge
+macos_battery_charge_rate_watts{serial="ZTMDHJEZ8JKMYVAJKU"} -10.297116
+# HELP macos_battery_current_capacity_amps Current charge capacity in Ah.
+# TYPE macos_battery_current_capacity_amps gauge
+macos_battery_current_capacity_amps{serial="ZTMDHJEZ8JKMYVAJKU"} 1.127
+# HELP macos_battery_current_capacity_watts Current charge capacity in Wh.
+# TYPE macos_battery_current_capacity_watts gauge
+macos_battery_current_capacity_watts{serial="ZTMDHJEZ8JKMYVAJKU"} 12.518716
+# HELP macos_battery_current_percentage Current battery charge percentage.
+# TYPE macos_battery_current_percentage gauge
+macos_battery_current_percentage{serial="ZTMDHJEZ8JKMYVAJKU"} 18
+# HELP macos_battery_cycle_count Current battery cycle count.
+# TYPE macos_battery_cycle_count counter
+macos_battery_cycle_count{serial="ZTMDHJEZ8JKMYVAJKU"} 15
+# HELP macos_battery_design_capacity_amps Design capacity in Ah.
+# TYPE macos_battery_design_capacity_amps gauge
+macos_battery_design_capacity_amps{serial="ZTMDHJEZ8JKMYVAJKU"} 6.249
+# HELP macos_battery_design_capacity_watts Design capacity in Wh.
+# TYPE macos_battery_design_capacity_watts gauge
+macos_battery_design_capacity_watts{serial="ZTMDHJEZ8JKMYVAJKU"} 69.413892
+# HELP macos_battery_fully_charged Indicates if the battery is fully charged.
+# TYPE macos_battery_fully_charged gauge
+macos_battery_fully_charged{serial="ZTMDHJEZ8JKMYVAJKU"} 0
+# HELP macos_battery_health Battery health as a percentage (0-100%).
+# TYPE macos_battery_health gauge
+macos_battery_health{serial="ZTMDHJEZ8JKMYVAJKU"} 100
+# HELP macos_battery_info Basic details about the battery.
+# TYPE macos_battery_info gauge
+macos_battery_info{built_in="true",device_name="ayzo3hgs",serial="ZTMDHJEZ8JKMYVAJKU"} 1
+# HELP macos_battery_is_charging Indicates if the battery is currently charging.
+# TYPE macos_battery_is_charging gauge
+macos_battery_is_charging{serial="ZTMDHJEZ8JKMYVAJKU"} 0
+# HELP macos_battery_max_capacity_amps Design capacity in Ah.
+# TYPE macos_battery_max_capacity_amps gauge
+macos_battery_max_capacity_amps{serial="ZTMDHJEZ8JKMYVAJKU"} 6.262
+# HELP macos_battery_max_capacity_watts Design capacity in Wh.
+# TYPE macos_battery_max_capacity_watts gauge
+macos_battery_max_capacity_watts{serial="ZTMDHJEZ8JKMYVAJKU"} 69.558296
+# HELP macos_battery_temperature_celsius Current battery temperature in °C.
+# TYPE macos_battery_temperature_celsius gauge
+macos_battery_temperature_celsius{serial="ZTMDHJEZ8JKMYVAJKU"} 30.47
+# HELP macos_battery_time_remaining_seconds Estimated time remaining until battery is fully charged or discharged.
+# TYPE macos_battery_time_remaining_seconds gauge
+macos_battery_time_remaining_seconds{serial="ZTMDHJEZ8JKMYVAJKU"} 3540
+# HELP macos_battery_voltage_volts Current battery voltage in V.
+# TYPE macos_battery_voltage_volts gauge
+macos_battery_voltage_volts{serial="ZTMDHJEZ8JKMYVAJKU"} 11.108
+```
+
+### Write to File
+
+```bash
+macos-battery-exporter -o battery.txt
+```
+
+### Run Server
+
+```bash
+macos-battery-exporter -s
+```
+
+```bash
+curl http://localhost:9108/metrics
+```