Implement Cobra CLI tooling, Viper config tooling (#336)

* start pulling out + replacing urfave and config

* replace many many instances of config

* move more stuff => viper

* properly remove urfave

* move some flags to root command

* add testrig commands to root

* alias config file keys

* start adding cli parsing tests

* reorder viper init

* remove config path alias

* fmt

* change config file keys to non-nested

* we're more or less in business now

* tidy up the common func

* go fmt

* get tests passing again

* add note about the cliparsing tests

* reorganize

* update docs with changes

* structure cmd dir better

* rename + move some files around

* fix dangling comma

internal/processing/federation/federation.go

@@ -24,7 +24,6 @@ import (
 	"net/url"
 
 	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
-	"github.com/superseriousbusiness/gotosocial/internal/config"
 	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/federation"
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
@@ -83,7 +82,6 @@ type Processor interface {
 
 type processor struct {
 	db            db.DB
-	config        *config.Config
 	federator     federation.Federator
 	tc            typeutils.TypeConverter
 	filter        visibility.Filter
@@ -91,10 +89,9 @@ type processor struct {
 }
 
 // New returns a new federation processor.
-func New(db db.DB, tc typeutils.TypeConverter, config *config.Config, federator federation.Federator, fromFederator chan messages.FromFederator) Processor {
+func New(db db.DB, tc typeutils.TypeConverter, federator federation.Federator, fromFederator chan messages.FromFederator) Processor {
 	return &processor{
 		db:            db,
-		config:        config,
 		federator:     federator,
 		tc:            tc,
 		filter:        visibility.NewFilter(db),

internal/processing/federation/getnodeinfo.go

@@ -23,7 +23,9 @@ import (
 	"fmt"
 	"net/http"
 
+	"github.com/spf13/viper"
 	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 )
 
@@ -38,29 +40,35 @@ var (
 )
 
 func (p *processor) GetNodeInfoRel(ctx context.Context, request *http.Request) (*apimodel.WellKnownResponse, gtserror.WithCode) {
+	protocol := viper.GetString(config.Keys.Protocol)
+	host := viper.GetString(config.Keys.Host)
+
 	return &apimodel.WellKnownResponse{
 		Links: []apimodel.Link{
 			{
 				Rel:  nodeInfoRel,
-				Href: fmt.Sprintf("%s://%s/nodeinfo/%s", p.config.Protocol, p.config.Host, nodeInfoVersion),
+				Href: fmt.Sprintf("%s://%s/nodeinfo/%s", protocol, host, nodeInfoVersion),
 			},
 		},
 	}, nil
 }
 
 func (p *processor) GetNodeInfo(ctx context.Context, request *http.Request) (*apimodel.Nodeinfo, gtserror.WithCode) {
+	openRegistration := viper.GetBool(config.Keys.AccountsRegistrationOpen)
+	softwareVersion := viper.GetString(config.Keys.SoftwareVersion)
+
 	return &apimodel.Nodeinfo{
 		Version: nodeInfoVersion,
 		Software: apimodel.NodeInfoSoftware{
 			Name:    nodeInfoSoftwareName,
-			Version: p.config.SoftwareVersion,
+			Version: softwareVersion,
 		},
 		Protocols: nodeInfoProtocols,
 		Services: apimodel.NodeInfoServices{
 			Inbound:  []string{},
 			Outbound: []string{},
 		},
-		OpenRegistrations: p.config.AccountsConfig.OpenRegistration,
+		OpenRegistrations: openRegistration,
 		Usage: apimodel.NodeInfoUsage{
 			Users: apimodel.NodeInfoUsers{},
 		},

internal/processing/federation/getwebfinger.go

@@ -22,7 +22,9 @@ import (
 	"context"
 	"fmt"
 
+	"github.com/spf13/viper"
 	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 )
 
@@ -41,9 +43,11 @@ func (p *processor) GetWebfingerAccount(ctx context.Context, requestedUsername s
 		return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
 	}
 
+	accountDomain := viper.GetString(config.Keys.AccountDomain)
+
 	// return the webfinger representation
 	return &apimodel.WellKnownResponse{
-		Subject: fmt.Sprintf("%s:%s@%s", webfingerAccount, requestedAccount.Username, p.config.AccountDomain),
+		Subject: fmt.Sprintf("%s:%s@%s", webfingerAccount, requestedAccount.Username, accountDomain),
 		Aliases: []string{
 			requestedAccount.URI,
 			requestedAccount.URL,