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// Package internal centralizes a lot of other boring configuration and startup logic into a common place.
package internal
import (
"context"
"flag"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"github.com/posener/complete"
"go4.org/legal"
"within.website/confyg/flagconfyg"
"within.website/ln"
"within.website/ln/opname"
"within.website/x/internal/flagenv"
"within.website/x/internal/manpage"
"within.website/x/web/useragent"
// Debug routes
"net/http"
_ "net/http/pprof"
// Older projects use .env files, shim in compatibility
_ "github.com/joho/godotenv/autoload"
)
var (
licenseShow = flag.Bool("license", false, "show software licenses?")
config = flag.String("config", "", "configuration file, if set (see flagconfyg(4))")
writeConfig = flag.String("write-config", "", "if set, write flags to this file by name/path")
manpageGen = flag.Bool("manpage", false, "generate a manpage template?")
)
// HandleStartup optionally shows all software licenses or other things.
// This always loads from the following configuration sources in the following
// order:
//
// - command line flags (to get -config)
// - environment variables
// - configuration file (if -config is set)
// - command line flags
//
// This is done this way to ensure that command line flags always are the deciding
// factor as an escape hatch.
func HandleStartup() {
flag.Parse()
flagenv.Parse()
ctx := opname.With(context.Background(), "internal.HandleStartup")
if val := *writeConfig; val != "" {
ln.Log(ctx, ln.Info("writing flags to file, remember to remove write-config"), ln.F{"fname": val})
data := flagconfyg.Dump(flag.CommandLine)
err := ioutil.WriteFile(val, data, 0644)
if err != nil {
ln.FatalErr(ctx, err)
}
os.Exit(0)
}
if *config != "" {
ln.Log(ctx, ln.Info("loading config"), ln.F{"path": *config})
flagconfyg.CmdParse(*config)
}
flag.Parse()
if *licenseShow {
fmt.Printf("Licenses for %v\n", os.Args)
for _, li := range legal.Licenses() {
fmt.Println(li)
fmt.Println()
}
os.Exit(0)
}
if *manpageGen {
manpage.Spew()
}
}
func init() {
http.DefaultTransport = useragent.Transport("within.website-x", "https://within.website/.x.botinfo", http.DefaultTransport)
}
func HandleCompletion(args complete.Predictor, subcommands complete.Commands) {
cmd := complete.Command{
Flags: map[string]complete.Predictor{},
Sub: subcommands,
Args: args,
}
flag.CommandLine.VisitAll(func(fl *flag.Flag) {
cmd.Flags["-"+fl.Name] = complete.PredictAnything
if fl.DefValue == "true" || fl.DefValue == "false" {
cmd.Flags["-"+fl.Name] = complete.PredictNothing
}
})
if complete.New(filepath.Base(os.Args[0]), cmd).Run() {
os.Exit(0)
}
}
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