Create a struct with all of Hugo's config options

Primary motivation is documentation, but it will also hopefully simplify the code.

Also,

* Lower case the default output format names; this is in line with the custom ones (map keys) and how
it's treated all the places. This avoids doing `stringds.EqualFold` everywhere.

Closes #10896
Closes #10620

hugolib/configdir_test.go

@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2023 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -13,140 +13,43 @@
 
 package hugolib
 
-import (
-	"path/filepath"
-	"testing"
+import "testing"
 
-	"github.com/gohugoio/hugo/common/herrors"
+func TestConfigDir(t *testing.T) {
 
-	qt "github.com/frankban/quicktest"
-	"github.com/gohugoio/hugo/htesting"
-	"github.com/spf13/afero"
-)
-
-func TestLoadConfigDir(t *testing.T) {
 	t.Parallel()
 
-	c := qt.New(t)
-
-	configContent := `
-baseURL = "https://example.org"
-paginagePath = "pag_root"
-
-[languages.en]
-weight = 0
-languageName = "English"
-
-[languages.no]
-weight = 10
-languageName = "FOO"
-
+	files := `
+-- config/_default/params.toml --
+a = "acp1"
+d = "dcp1"
+-- config/_default/config.toml --
 [params]
-p1 = "p1_base"
+a = "ac1"
+b = "bc1"
 
+-- hugo.toml --
+baseURL = "https://example.com"
+disableKinds = ["taxonomy", "term", "RSS", "sitemap", "robotsTXT", "page", "setion"]
+ignoreErrors = ["error-missing-instagram-accesstoken"]
+[params]
+a = "a1"
+b = "b1"
+c = "c1"
+-- layouts/index.html --
+Params: {{ site.Params}}
 `
+	b := NewIntegrationTestBuilder(
+		IntegrationTestConfig{
+			T:           t,
+			TxtarString: files,
+		},
+	).Build()
 
-	mm := afero.NewMemMapFs()
+	b.AssertFileContent("public/index.html", `
+Params: map[a:acp1 b:bc1 c:c1 d:dcp1]
 
-	writeToFs(t, mm, "hugo.toml", configContent)
 
-	fb := htesting.NewTestdataBuilder(mm, "config/_default", t)
-
-	fb.Add("config.toml", `paginatePath = "pag_default"`)
-
-	fb.Add("params.yaml", `
-p2: "p2params_default"
-p3: "p3params_default"
-p4: "p4params_default"
-`)
-	fb.Add("menus.toml", `
-[[docs]]
-name = "About Hugo"
-weight = 1
-[[docs]]
-name = "Home"
-weight = 2
-	`)
-
-	fb.Add("menus.no.toml", `
-	[[docs]]
-	name = "Om Hugo"
-	weight = 1
-	`)
-
-	fb.Add("params.no.toml",
-		`
-p3 = "p3params_no_default"
-p4 = "p4params_no_default"`,
-	)
-	fb.Add("languages.no.toml", `languageName = "Norsk_no_default"`)
-
-	fb.Build()
-
-	fb = fb.WithWorkingDir("config/production")
-
-	fb.Add("config.toml", `paginatePath = "pag_production"`)
-
-	fb.Add("params.no.toml", `
-p2 = "p2params_no_production"
-p3 = "p3params_no_production"
 `)
 
-	fb.Build()
-
-	fb = fb.WithWorkingDir("config/development")
-
-	// This is set in all the config.toml variants above, but this will win.
-	fb.Add("config.TOML", `paginatePath = "pag_development"`)
-	// Issue #5646
-	fb.Add("config.toml.swp", `p3 = "paginatePath = "nono"`)
-
-	fb.Add("params.no.toml", `p3 = "p3params_no_development"`)
-	fb.Add("params.toml", `p3 = "p3params_development"`)
-
-	fb.Build()
-
-	cfg, _, err := LoadConfig(ConfigSourceDescriptor{Fs: mm, Environment: "development", Filename: "hugo.toml", AbsConfigDir: "config"})
-	c.Assert(err, qt.IsNil)
-
-	c.Assert(cfg.GetString("paginatePath"), qt.Equals, "pag_development") // /config/development/config.toml
-
-	c.Assert(cfg.GetInt("languages.no.weight"), qt.Equals, 10)                          //  /config.toml
-	c.Assert(cfg.GetString("languages.no.languageName"), qt.Equals, "Norsk_no_default") // /config/_default/languages.no.toml
-
-	c.Assert(cfg.GetString("params.p1"), qt.Equals, "p1_base")
-	c.Assert(cfg.GetString("params.p2"), qt.Equals, "p2params_default") // Is in both _default and production
-	c.Assert(cfg.GetString("params.p3"), qt.Equals, "p3params_development")
-	c.Assert(cfg.GetString("languages.no.params.p3"), qt.Equals, "p3params_no_development")
-
-	c.Assert(len(cfg.Get("menus.docs").([]any)), qt.Equals, 2)
-	noMenus := cfg.Get("languages.no.menus.docs")
-	c.Assert(noMenus, qt.Not(qt.IsNil))
-	c.Assert(len(noMenus.([]any)), qt.Equals, 1)
-}
-
-func TestLoadConfigDirError(t *testing.T) {
-	t.Parallel()
-
-	c := qt.New(t)
-
-	configContent := `
-baseURL = "https://example.org"
-
-`
-
-	mm := afero.NewMemMapFs()
-
-	writeToFs(t, mm, "hugo.toml", configContent)
-
-	fb := htesting.NewTestdataBuilder(mm, "config/development", t)
-
-	fb.Add("config.toml", `invalid & syntax`).Build()
-
-	_, _, err := LoadConfig(ConfigSourceDescriptor{Fs: mm, Environment: "development", Filename: "hugo.toml", AbsConfigDir: "config"})
-	c.Assert(err, qt.Not(qt.IsNil))
-
-	fe := herrors.UnwrapFileError(err)
-	c.Assert(fe, qt.Not(qt.IsNil))
-	c.Assert(fe.Position().Filename, qt.Equals, filepath.FromSlash("config/development/config.toml"))
 }