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/federation/dereferencing/thread.go

@@ -24,7 +24,9 @@ import (
 	"net/url"
 
 	"github.com/sirupsen/logrus"
+	"github.com/spf13/viper"
 	"github.com/superseriousbusiness/gotosocial/internal/ap"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
 	"github.com/superseriousbusiness/gotosocial/internal/util"
 )
 
@@ -43,7 +45,8 @@ func (d *deref) DereferenceThread(ctx context.Context, username string, statusIR
 	l.Debug("entering DereferenceThread")
 
 	// if it's our status we already have everything stashed so we can bail early
-	if statusIRI.Host == d.config.Host {
+	host := viper.GetString(config.Keys.Host)
+	if statusIRI.Host == host {
 		l.Debug("iri belongs to us, bailing")
 		return nil
 	}
@@ -77,7 +80,8 @@ func (d *deref) iterateAncestors(ctx context.Context, username string, statusIRI
 	l.Debug("entering iterateAncestors")
 
 	// if it's our status we don't need to dereference anything so we can immediately move up the chain
-	if statusIRI.Host == d.config.Host {
+	host := viper.GetString(config.Keys.Host)
+	if statusIRI.Host == host {
 		l.Debug("iri belongs to us, moving up to next ancestor")
 
 		// since this is our status, we know we can extract the id from the status path
@@ -129,7 +133,8 @@ func (d *deref) iterateDescendants(ctx context.Context, username string, statusI
 	l.Debug("entering iterateDescendants")
 
 	// if it's our status we already have descendants stashed so we can bail early
-	if statusIRI.Host == d.config.Host {
+	host := viper.GetString(config.Keys.Host)
+	if statusIRI.Host == host {
 		l.Debug("iri belongs to us, bailing")
 		return nil
 	}
@@ -205,7 +210,8 @@ pageLoop:
 				continue
 			}
 
-			if itemURI.Host == d.config.Host {
+			host := viper.GetString(config.Keys.Host)
+			if itemURI.Host == host {
 				// skip if the reply is from us -- we already have it then
 				continue
 			}