Rename taxonomy kinds from taxonomy to term, taxonomyTerm to taxonomy

And we have taken great measures to limit potential site breakage:

* For `disableKinds` and `outputs` we try to map from old to new values if possible, if not we print an ERROR that can be toggled off if not relevant.
* The layout lookup is mostly compatible with more options for the new `term` kind.

That leaves:

* Where queries in site.Pages using taxonomy/taxonomyTerm Kind values as filter.
* Other places where these kind value are used in the templates (classes etc.)

Fixes #6911
Fixes #7395

hugolib/breaking_changes_test.go

@@ -0,0 +1,141 @@
+// Copyright 2020 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.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hugolib
+
+import (
+	"fmt"
+	"testing"
+
+	qt "github.com/frankban/quicktest"
+)
+
+func Test073(t *testing.T) {
+
+	asertDisabledTaxonomyAndTerm := func(b *sitesBuilder, taxonomy, term bool) {
+		b.Assert(b.CheckExists("public/tags/index.html"), qt.Equals, taxonomy)
+		b.Assert(b.CheckExists("public/tags/tag1/index.html"), qt.Equals, term)
+
+	}
+
+	assertOutputTaxonomyAndTerm := func(b *sitesBuilder, taxonomy, term bool) {
+		b.Assert(b.CheckExists("public/tags/index.json"), qt.Equals, taxonomy)
+		b.Assert(b.CheckExists("public/tags/tag1/index.json"), qt.Equals, term)
+	}
+
+	for _, this := range []struct {
+		name   string
+		config string
+		assert func(err error, out string, b *sitesBuilder)
+	}{
+		{
+			"Outputs for both taxonomy and taxonomyTerm",
+			`[outputs]
+ taxonomy = ["JSON"]
+ taxonomyTerm = ["JSON"]
+
+`,
+			func(err error, out string, b *sitesBuilder) {
+				b.Assert(err, qt.IsNil)
+				assertOutputTaxonomyAndTerm(b, true, true)
+
+			},
+		},
+		{
+			"Outputs for taxonomyTerm",
+			`[outputs]
+taxonomyTerm = ["JSON"]
+
+`,
+			func(err error, out string, b *sitesBuilder) {
+				b.Assert(err, qt.IsNil)
+				assertOutputTaxonomyAndTerm(b, true, false)
+
+			},
+		},
+		{
+			"Outputs for taxonomy only",
+			`[outputs]
+taxonomy = ["JSON"]
+
+`,
+			func(err error, out string, b *sitesBuilder) {
+				b.Assert(err, qt.Not(qt.IsNil))
+				b.Assert(out, qt.Contains, `ignoreErrors = ["error-output-taxonomy"]`)
+
+			},
+		},
+		{
+			"Outputs for taxonomy only, ignore error",
+			`
+ignoreErrors = ["error-output-taxonomy"]
+[outputs]
+taxonomy = ["JSON"]
+
+`,
+			func(err error, out string, b *sitesBuilder) {
+				b.Assert(err, qt.IsNil)
+				assertOutputTaxonomyAndTerm(b, true, false)
+
+			},
+		},
+		{
+			"Disable both taxonomy and taxonomyTerm",
+			`disableKinds = ["taxonomy", "taxonomyTerm"]`,
+			func(err error, out string, b *sitesBuilder) {
+				b.Assert(err, qt.IsNil)
+				asertDisabledTaxonomyAndTerm(b, false, false)
+
+			},
+		},
+		{
+			"Disable only taxonomyTerm",
+			`disableKinds = ["taxonomyTerm"]`,
+			func(err error, out string, b *sitesBuilder) {
+				b.Assert(err, qt.IsNil)
+				asertDisabledTaxonomyAndTerm(b, false, true)
+
+			},
+		},
+		{
+			"Disable only taxonomy",
+			`disableKinds = ["taxonomy"]`,
+			func(err error, out string, b *sitesBuilder) {
+				b.Assert(err, qt.Not(qt.IsNil))
+				b.Assert(out, qt.Contains, `ignoreErrors = ["error-disable-taxonomy"]`)
+			},
+		},
+		{
+			"Disable only taxonomy, ignore error",
+			`disableKinds = ["taxonomy"]
+			ignoreErrors = ["error-disable-taxonomy"]`,
+			func(err error, out string, b *sitesBuilder) {
+				b.Assert(err, qt.IsNil)
+				asertDisabledTaxonomyAndTerm(b, false, true)
+			},
+		},
+	} {
+
+		t.Run(this.name, func(t *testing.T) {
+			b := newTestSitesBuilder(t).WithConfigFile("toml", this.config)
+			b.WithTemplatesAdded("_default/list.json", "JSON")
+			out, err := captureStdout(func() error {
+				return b.BuildE(BuildCfg{})
+			})
+			fmt.Println(out)
+			this.assert(err, out, b)
+		})
+
+	}
+
+}