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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"
stdslog "log/slog"
"os"
"path/filepath"
"github.com/posener/complete"
"go4.org/legal"
"within.website/x"
"within.website/x/flagfolder"
"within.website/x/internal/confyg/flagconfyg"
"within.website/x/internal/flagenv"
"within.website/x/internal/manpage"
"within.website/x/internal/slog"
// Debug routes
_ "expvar"
_ "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", configFileLocation(), "configuration file, if set (see flagconfyg(4))")
manpageGen = flag.Bool("manpage", false, "generate a manpage template?")
)
func configFileLocation() string {
dir, err := os.UserConfigDir()
if err != nil {
//ln.Error(context.Background(), err, ln.Debug("can't read config dir"))
return ""
}
dir = filepath.Join(dir, "within.website", "x")
os.MkdirAll(dir, 0700)
return filepath.Join(dir, filepath.Base(os.Args[0])+".config")
}
// 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
// - any secrets mounted to /run/secrets
// - 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, at the cost of potentially evaluating flags twice.
func HandleStartup() {
flag.Parse()
flagenv.Parse()
flagfolder.Parse()
ctx := context.Background()
if *config != "" {
flagconfyg.CmdParse(ctx, *config)
}
flag.Parse()
slog.Init()
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()
}
stdslog.Debug("starting up", "version", x.Version, "program", filepath.Base(os.Args[0]))
}
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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