xt/main.go

package main

import (
	"context"
	"fmt"
	"io"
	"os"
	"os/signal"
)

type contextKey struct{ name string }

type console struct {
	io.Reader
	io.Writer
	err io.Writer
	context.Context
	abort func()
}

func (c console) Log(v ...any) { fmt.Fprintln(c.err, v...) }
func (c console) Args() args   { return c.Get("args").(args) }
func (c *console) Set(name string, value any) {
	c.Context = context.WithValue(c.Context, contextKey{name}, value)
}
func (c console) Get(name string) any {
	return c.Context.Value(contextKey{name})
}

type args struct {
	dbtype string
	dbfile string
	baseFeed string
	Nick string
	URI string
}

func env(key, def string) string {
	if v, ok := os.LookupEnv(key); ok {
		return v
	}
	return def
}

func main() {
	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
	console := console{os.Stdin, os.Stdout, os.Stderr, ctx, stop}

	go func() { <-ctx.Done(); console.Log("shutdown"); stop() }()

	args := args{
		env("XT_DBTYPE", "sqlite3"),
		env("XT_DBFILE", "file:twt.db"),
		env("XT_BASE_FEED", "feed"),
		env("XT_NICK", "xuu"),
		env("XT_URI", "https://txt.sour.is/users/xuu/twtxt.txt"),
	}

	console.Set("args", args)

	if err := run(console); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}