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

1 files changed, 175 insertions, 0 deletions

diff --git a/internal/config/keys.go b/internal/config/keys.go
new file mode 100644
index 000000000..80ca36381
--- /dev/null
+++ b/internal/config/keys.go
@@ -0,0 +1,175 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package config
+
+// KeyNames is a struct that just contains the names of configuration keys.
+type KeyNames struct {
+	// root
+	LogLevel   string
+	ConfigPath string
+
+	// general
+	ApplicationName string
+	Host            string
+	AccountDomain   string
+	Protocol        string
+	BindAddress     string
+	Port            string
+	TrustedProxies  string
+	SoftwareVersion string
+
+	// database
+	DbType      string
+	DbAddress   string
+	DbPort      string
+	DbUser      string
+	DbPassword  string
+	DbDatabase  string
+	DbTLSMode   string
+	DbTLSCACert string
+
+	// template
+	WebTemplateBaseDir string
+	WebAssetBaseDir    string
+
+	// accounts
+	AccountsRegistrationOpen string
+	AccountsApprovalRequired string
+	AccountsReasonRequired   string
+
+	// media
+	MediaImageMaxSize        string
+	MediaVideoMaxSize        string
+	MediaDescriptionMinChars string
+	MediaDescriptionMaxChars string
+
+	// storage
+	StorageBackend       string
+	StorageBasePath      string
+	StorageServeProtocol string
+	StorageServeHost     string
+	StorageServeBasePath string
+
+	// statuses
+	StatusesMaxChars           string
+	StatusesCWMaxChars         string
+	StatusesPollMaxOptions     string
+	StatusesPollOptionMaxChars string
+	StatusesMediaMaxFiles      string
+
+	// letsencrypt
+	LetsEncryptEnabled      string
+	LetsEncryptCertDir      string
+	LetsEncryptEmailAddress string
+	LetsEncryptPort         string
+
+	// oidc
+	OIDCEnabled          string
+	OIDCIdpName          string
+	OIDCSkipVerification string
+	OIDCIssuer           string
+	OIDCClientID         string
+	OIDCClientSecret     string
+	OIDCScopes           string
+
+	// smtp
+	SMTPHost     string
+	SMTPPort     string
+	SMTPUsername string
+	SMTPPassword string
+	SMTPFrom     string
+
+	// admin
+	AdminAccountUsername string
+	AdminAccountEmail    string
+	AdminAccountPassword string
+	AdminTransPath       string
+}
+
+// Keys contains the names of the various keys used for initializing and storing flag variables,
+// and retrieving values from the viper config store.
+var Keys = KeyNames{
+	LogLevel:        "log-level",
+	ApplicationName: "application-name",
+	ConfigPath:      "config-path",
+	Host:            "host",
+	AccountDomain:   "account-domain",
+	Protocol:        "protocol",
+	BindAddress:     "bind-address",
+	Port:            "port",
+	TrustedProxies:  "trusted-proxies",
+	SoftwareVersion: "software-version",
+
+	DbType:      "db-type",
+	DbAddress:   "db-address",
+	DbPort:      "db-port",
+	DbUser:      "db-user",
+	DbPassword:  "db-password",
+	DbDatabase:  "db-database",
+	DbTLSMode:   "db-tls-mode",
+	DbTLSCACert: "db-tls-ca-cert",
+
+	WebTemplateBaseDir: "web-template-base-dir",
+	WebAssetBaseDir:    "web-asset-base-dir",
+
+	AccountsRegistrationOpen: "accounts-registration-open",
+	AccountsApprovalRequired: "accounts-approval-required",
+	AccountsReasonRequired:   "accounts-reason-required",
+
+	MediaImageMaxSize:        "media-image-max-size",
+	MediaVideoMaxSize:        "media-video-max-size",
+	MediaDescriptionMinChars: "media-description-min-chars",
+	MediaDescriptionMaxChars: "media-description-max-chars",
+
+	StorageBackend:       "storage-backend",
+	StorageBasePath:      "storage-base-path",
+	StorageServeProtocol: "storage-serve-protocol",
+	StorageServeHost:     "storage-serve-host",
+	StorageServeBasePath: "storage-serve-base-path",
+
+	StatusesMaxChars:           "statuses-max-chars",
+	StatusesCWMaxChars:         "statuses-cw-max-chars",
+	StatusesPollMaxOptions:     "statuses-poll-max-options",
+	StatusesPollOptionMaxChars: "statuses-poll-option-max-chars",
+	StatusesMediaMaxFiles:      "statuses-media-max-files",
+
+	LetsEncryptEnabled:      "letsencrypt-enabled",
+	LetsEncryptPort:         "letsencrypt-port",
+	LetsEncryptCertDir:      "letsencrypt-cert-dir",
+	LetsEncryptEmailAddress: "letsencrypt-email-address",
+
+	OIDCEnabled:          "oidc-enabled",
+	OIDCIdpName:          "oidc-idp-name",
+	OIDCSkipVerification: "oidc-skip-verification",
+	OIDCIssuer:           "oidc-issuer",
+	OIDCClientID:         "oidc-client-id",
+	OIDCClientSecret:     "oidc-client-secret",
+	OIDCScopes:           "oidc-scopes",
+
+	SMTPHost:     "smtp-host",
+	SMTPPort:     "smtp-port",
+	SMTPUsername: "smtp-username",
+	SMTPPassword: "smtp-password",
+	SMTPFrom:     "smtp-from",
+
+	AdminAccountUsername: "username",
+	AdminAccountEmail:    "email",
+	AdminAccountPassword: "password",
+	AdminTransPath:       "path",
+}