statusline/statusline.go

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package main
import (
"flag"
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"fmt"
"os"
"runtime"
"time"
"github.com/shirou/gopsutil/v3/load"
"github.com/shirou/gopsutil/v3/mem"
)
type Format struct {
Default, Warning string
}
var defaultFormat = Format{}
var tmuxFormat = Format{Default: "#[default]", Warning: "#[bg=colour208]"}
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var binarySuffixes = []string{"B", "KiB", "MiB", "GiB", "TiB"}
const binaryFactor = 1024
func HBin(a uint64, precision int) string {
f := float64(a)
var suffix string
for _, suffix = range binarySuffixes {
if f < binaryFactor {
break
}
f /= binaryFactor
}
return fmt.Sprintf("%.*f%s", precision, f, suffix)
}
func usage() {
fmt.Fprintln(os.Stderr, "Usage:", os.Args[0], "<window_width>")
os.Exit(2)
}
func printLoad(format Format, precision int) {
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l, err := load.Avg()
if err != nil {
panic(err) // fixme
}
if l.Load1 > float64(runtime.NumCPU()) {
fmt.Print(format.Warning)
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}
fmt.Printf("[%.[1]*[2]f %.[1]*[3]f %.[1]*[4]f]",
precision, l.Load1, l.Load5, l.Load15)
}
func printMem(format Format, absolute, percent bool) {
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if !(absolute || percent) {
return
}
v, err := mem.VirtualMemory()
if err != nil {
panic(err) //fixme
}
if v.UsedPercent > 90 {
fmt.Print(format.Warning, "[")
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} else {
fmt.Print(format.Default, "[")
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}
if absolute {
fmt.Printf("%s/%s", HBin(v.Used, 1), HBin(v.Total, 1))
if percent {
fmt.Print(" ")
}
}
if percent {
fmt.Printf("%.0f%%", v.UsedPercent)
}
fmt.Print("]")
}
func printTime(format Format, timeFormat string) {
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now := time.Now()
fmt.Print(format.Default, now.Format(timeFormat))
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}
func main() {
cols := flag.Uint("c", 0, "Window width in columns. 0 prints everything.")
mode := flag.String("style", "none", "Include style directives in output. Valid values: none tmux")
flag.Parse()
format := defaultFormat
switch *mode {
case "", "none":
case "tmux":
format = tmuxFormat
default:
fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
flag.PrintDefaults()
os.Exit(2)
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}
if *cols == 0 || *cols >= 150 {
printLoad(format, 2)
printMem(format, true, true)
printTime(format, " Mon 2006-01-02 15:04")
} else if *cols >= 120 {
printLoad(format, 2)
printMem(format, false, true)
printTime(format, " 15:04")
} else if *cols >= 100 {
printLoad(format, 0)
printMem(format, false, true)
printTime(format, " 15:04")
} else if *cols >= 80 {
printTime(format, "15:04")
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}
}