init

.gitignore

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+bin/

Makefile

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+build:
+	go build -o bin/gobar ./cmd/gobar
+
+test:
+	go test ./...

README.md

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+# gobar
+A shitty program to update dwlb and other dwm/dwl status bars by writing to a file or stdout.  While not as extensible as something like someblocks, this program aims to be easy to run as a userspace daemon.  It's extremely lightweight and extensible. 

cmd/gobar/main.go

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+package main
+
+import (
+	"context"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"git.jthan.io/jonathan/gobar/internal/config"
+	"git.jthan.io/jonathan/gobar/internal/daemon"
+)
+
+func main() {
+	ctx, stop := signal.NotifyContext(
+		context.Background(),
+		os.Interrupt,
+		syscall.SIGTERM,
+	)
+	defer stop()
+
+	cfg := config.Default()
+
+	if err := daemon.Run(ctx, cfg); err != nil {
+		os.Exit(1)
+	}
+}

go.mod

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+module git.jthan.io/jonathan/gobar
+
+go 1.25.0

internal/collectors/battery.go

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+package collectors

internal/collectors/collector.go

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+package collectors
+
+type StatusInfo struct {
+	CPULoad1       float32
+	CPULoad5       float32
+	CPULoad15      float32
+	Year           int
+	Month          int
+	Day            int
+	Hour           int
+	Minute         int
+	Second         int
+	BatteryPercent int
+	BatteryStatus  string
+}
+
+func Collect() (*StatusInfo, error) {
+	year, month, day, hour, minute, second := datetime()
+	cpuLoad1, cpuLoad5, cpuLoad15 := cpuLoad()
+	return &StatusInfo{
+		CPULoad1:       cpuLoad1,
+		CPULoad5:       cpuLoad5,
+		CPULoad15:      cpuLoad15,
+		Year:           year,
+		Month:          int(month),
+		Day:            day,
+		Hour:           hour,
+		Minute:         minute,
+		Second:         second,
+		BatteryPercent: 100,
+		BatteryStatus:  "Charging",
+	}, nil
+}

internal/collectors/cpu.go

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+package collectors
+
+import (
+	"bufio"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func strToFloat32(input string) (float32) {
+	f64, err := strconv.ParseFloat(input, 32)
+	if err != nil {
+		log.Fatal(err)
+	}
+	f32 := float32(f64)
+	return f32
+}
+
+func cpuLoad() (load1, load5, load15 float32) {
+	const filePath string = "/proc/loadavg"
+	var firstLine string
+
+	file, err := os.Open(filePath)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+
+	if scanner.Scan() {
+		firstLine = scanner.Text()
+	}
+
+	if err := scanner.Err(); err != nil {
+		log.Fatal(err)
+	}
+
+	loadAverages := strings.Fields(firstLine)
+	load1 = strToFloat32(loadAverages[0])
+	load5 = strToFloat32(loadAverages[1])
+	load15 = strToFloat32(loadAverages[2])
+	return load1, load5, load15
+}

internal/collectors/datetime.go

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+package collectors
+
+import (
+	"time"
+)
+
+func datetime() (year int, month time.Month, day, hour, minute, second int){
+	currentTime := time.Now()
+	year, month, day = currentTime.Date()
+	hour, minute, second = currentTime.Clock()
+	return year, month, day, hour, minute, second
+}

internal/config/config.go

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+package config
+
+import (
+	"time"
+)
+
+type Config struct {
+	Interval time.Duration
+}
+
+func Default() Config {
+	return Config{
+		Interval: 30 * time.Second,
+	}
+}

internal/daemon/daemon.go

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+package daemon
+
+import (
+	"context"
+	"log"
+	"time"
+
+	"git.jthan.io/jonathan/gobar/internal/config"
+	"git.jthan.io/jonathan/gobar/internal/collectors"
+	"git.jthan.io/jonathan/gobar/internal/output"
+)
+
+func Run(ctx context.Context, cfg config.Config) error {
+	ticker := time.NewTicker(cfg.Interval)
+	defer ticker.Stop()
+
+	log.Printf("daemon started (interval=%s)", cfg.Interval)
+
+	for {
+		select {
+
+		case <-ctx.Done():
+			log.Println("daemon shutting down")
+			return nil
+
+		case <-ticker.C:
+			runOnce(ctx)
+		}
+	}
+}
+
+func runOnce(ctx context.Context) {
+	m, err := collectors.Collect()
+	if err != nil {
+		log.Println("collect error:", err)
+		return
+	}
+
+	output.Print(m)
+}

internal/output/stdout.go

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+package output
+
+import (
+	"fmt"
+	"git.jthan.io/jonathan/gobar/internal/collectors"
+)
+
+func Print(c *collectors.StatusInfo) {
+	fmt.Printf(
+		"LOAD: %.2f %.2f %.2f | %d-%d-%d %d:%d\n",
+		c.CPULoad1,
+		c.CPULoad5,
+		c.CPULoad15,
+		c.Year,
+		c.Month,
+		c.Day,
+		c.Hour,
+		c.Minute,
+	)
+}