Add tpl/site and tpl/hugo

This means that the current `.Site` and ´.Hugo` is available as a globals, so you can do `site.IsServer`, `hugo.Version` etc.

Fixes #5470
Fixes #5467
Fixes #5503

8 files changed, 470 insertions, 0 deletions

diff --git a/common/hugo/hugo.go b/common/hugo/hugo.go
new file mode 100644
index 000000000..b93b10bf1
--- /dev/null
+++ b/common/hugo/hugo.go
@@ -0,0 +1,45 @@
+// Copyright 2018 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 hugo
+
+import (
+	"fmt"
+	"html/template"
+)
+
+var (
+	// CommitHash contains the current Git revision. Use make to build to make
+	// sure this gets set.
+	CommitHash string
+
+	// BuildDate contains the date of the current build.
+	BuildDate string
+)
+
+// Info contains information about the current Hugo environment
+type Info struct {
+	Version    VersionString
+	Generator  template.HTML
+	CommitHash string
+	BuildDate  string
+}
+
+func NewInfo() Info {
+	return Info{
+		Version:    CurrentVersion.Version(),
+		CommitHash: CommitHash,
+		BuildDate:  BuildDate,
+		Generator:  template.HTML(fmt.Sprintf(`<meta name="generator" content="Hugo %s" />`, CurrentVersion.String())),
+	}
+}
diff --git a/common/hugo/hugo_test.go b/common/hugo/hugo_test.go
new file mode 100644
index 000000000..18a9b594f
--- /dev/null
+++ b/common/hugo/hugo_test.go
@@ -0,0 +1,34 @@
+// Copyright 2018 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 hugo
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestHugoInfo(t *testing.T) {
+	assert := require.New(t)
+
+	hugoInfo := NewInfo()
+
+	assert.Equal(CurrentVersion.Version(), hugoInfo.Version)
+	assert.IsType(VersionString(""), hugoInfo.Version)
+	assert.Equal(CommitHash, hugoInfo.CommitHash)
+	assert.Equal(BuildDate, hugoInfo.BuildDate)
+	assert.Contains(hugoInfo.Generator, fmt.Sprintf("Hugo %s", hugoInfo.Version))
+
+}
diff --git a/common/hugo/site.go b/common/hugo/site.go
new file mode 100644
index 000000000..08391858a
--- /dev/null
+++ b/common/hugo/site.go
@@ -0,0 +1,24 @@
+// Copyright 2018 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 hugo
+
+import "github.com/gohugoio/hugo/langs"
+
+// Site represents a site in the build. This is currently a very narrow interface,
+// but the actual implementation will be richer, see hugolib.SiteInfo.
+type Site interface {
+	Language() *langs.Language
+	IsServer() bool
+	Hugo() Info
+}
diff --git a/common/hugo/vars_extended.go b/common/hugo/vars_extended.go
new file mode 100644
index 000000000..20683b804
--- /dev/null
+++ b/common/hugo/vars_extended.go
@@ -0,0 +1,18 @@
+// Copyright 2018 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.
+
+// +build extended
+
+package hugo
+
+var isExtended = true
diff --git a/common/hugo/vars_regular.go b/common/hugo/vars_regular.go
new file mode 100644
index 000000000..e1ece83fb
--- /dev/null
+++ b/common/hugo/vars_regular.go
@@ -0,0 +1,18 @@
+// Copyright 2018 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.
+
+// +build !extended
+
+package hugo
+
+var isExtended = false
diff --git a/common/hugo/version.go b/common/hugo/version.go
new file mode 100644
index 000000000..204f8f747
--- /dev/null
+++ b/common/hugo/version.go
@@ -0,0 +1,239 @@
+// Copyright 2018 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 hugo
+
+import (
+	"fmt"
+
+	"runtime"
+	"strings"
+
+	"github.com/gohugoio/hugo/compare"
+	"github.com/spf13/cast"
+)
+
+// Version represents the Hugo build version.
+type Version struct {
+	// Major and minor version.
+	Number float32
+
+	// Increment this for bug releases
+	PatchLevel int
+
+	// HugoVersionSuffix is the suffix used in the Hugo version string.
+	// It will be blank for release versions.
+	Suffix string
+}
+
+var (
+	_ compare.Eqer     = (*VersionString)(nil)
+	_ compare.Comparer = (*VersionString)(nil)
+)
+
+func (v Version) String() string {
+	return version(v.Number, v.PatchLevel, v.Suffix)
+}
+
+// Version returns the Hugo version.
+func (v Version) Version() VersionString {
+	return VersionString(v.String())
+}
+
+// VersionString represents a Hugo version string.
+type VersionString string
+
+func (h VersionString) String() string {
+	return string(h)
+}
+
+// Compare implements the compare.Comparer interface.
+func (h VersionString) Compare(other interface{}) int {
+	v := MustParseVersion(h.String())
+	return compareVersionsWithSuffix(v.Number, v.PatchLevel, v.Suffix, other)
+}
+
+// Eq implements the compare.Eqer interface.
+func (h VersionString) Eq(other interface{}) bool {
+	s, err := cast.ToStringE(other)
+	if err != nil {
+		return false
+	}
+	return s == h.String()
+}
+
+var versionSuffixes = []string{"-test", "-DEV"}
+
+// ParseVersion parses a version string.
+func ParseVersion(s string) (Version, error) {
+	var vv Version
+	for _, suffix := range versionSuffixes {
+		if strings.HasSuffix(s, suffix) {
+			vv.Suffix = suffix
+			s = strings.TrimSuffix(s, suffix)
+		}
+	}
+
+	v, p := parseVersion(s)
+
+	vv.Number = v
+	vv.PatchLevel = p
+
+	return vv, nil
+}
+
+// MustParseVersion parses a version string
+// and panics if any error occurs.
+func MustParseVersion(s string) Version {
+	vv, err := ParseVersion(s)
+	if err != nil {
+		panic(err)
+	}
+	return vv
+}
+
+// ReleaseVersion represents the release version.
+func (v Version) ReleaseVersion() Version {
+	v.Suffix = ""
+	return v
+}
+
+// Next returns the next Hugo release version.
+func (v Version) Next() Version {
+	return Version{Number: v.Number + 0.01}
+}
+
+// Prev returns the previous Hugo release version.
+func (v Version) Prev() Version {
+	return Version{Number: v.Number - 0.01}
+}
+
+// NextPatchLevel returns the next patch/bugfix Hugo version.
+// This will be a patch increment on the previous Hugo version.
+func (v Version) NextPatchLevel(level int) Version {
+	return Version{Number: v.Number - 0.01, PatchLevel: level}
+}
+
+// BuildVersionString creates a version string. This is what you see when
+// running "hugo version".
+func BuildVersionString() string {
+	program := "Hugo Static Site Generator"
+
+	version := "v" + CurrentVersion.String()
+	if CommitHash != "" {
+		version += "-" + strings.ToUpper(CommitHash)
+	}
+	if isExtended {
+		version += "/extended"
+	}
+
+	osArch := runtime.GOOS + "/" + runtime.GOARCH
+
+	var buildDate string
+	if BuildDate != "" {
+		buildDate = BuildDate
+	} else {
+		buildDate = "unknown"
+	}
+
+	return fmt.Sprintf("%s %s %s BuildDate: %s", program, version, osArch, buildDate)
+
+}
+
+func version(version float32, patchVersion int, suffix string) string {
+	if patchVersion > 0 {
+		return fmt.Sprintf("%.2f.%d%s", version, patchVersion, suffix)
+	}
+	return fmt.Sprintf("%.2f%s", version, suffix)
+}
+
+// CompareVersion compares the given version string or number against the
+// running Hugo version.
+// It returns -1 if the given version is less than, 0 if equal and 1 if greater than
+// the running version.
+func CompareVersion(version interface{}) int {
+	return compareVersionsWithSuffix(CurrentVersion.Number, CurrentVersion.PatchLevel, CurrentVersion.Suffix, version)
+}
+
+func compareVersions(inVersion float32, inPatchVersion int, in interface{}) int {
+	return compareVersionsWithSuffix(inVersion, inPatchVersion, "", in)
+}
+
+func compareVersionsWithSuffix(inVersion float32, inPatchVersion int, suffix string, in interface{}) int {
+	var c int
+	switch d := in.(type) {
+	case float64:
+		c = compareFloatVersions(inVersion, float32(d))
+	case float32:
+		c = compareFloatVersions(inVersion, d)
+	case int:
+		c = compareFloatVersions(inVersion, float32(d))
+	case int32:
+		c = compareFloatVersions(inVersion, float32(d))
+	case int64:
+		c = compareFloatVersions(inVersion, float32(d))
+	default:
+		s, err := cast.ToStringE(in)
+		if err != nil {
+			return -1
+		}
+
+		v, err := ParseVersion(s)
+		if err != nil {
+			return -1
+		}
+
+		if v.Number == inVersion && v.PatchLevel == inPatchVersion {
+			return strings.Compare(suffix, v.Suffix)
+		}
+
+		if v.Number < inVersion || (v.Number == inVersion && v.PatchLevel < inPatchVersion) {
+			return -1
+		}
+
+		return 1
+	}
+
+	if c == 0 && suffix != "" {
+		return 1
+	}
+
+	return c
+}
+
+func parseVersion(s string) (float32, int) {
+	var (
+		v float32
+		p int
+	)
+
+	if strings.Count(s, ".") == 2 {
+		li := strings.LastIndex(s, ".")
+		p = cast.ToInt(s[li+1:])
+		s = s[:li]
+	}
+
+	v = float32(cast.ToFloat64(s))
+
+	return v, p
+}
+
+func compareFloatVersions(version float32, v float32) int {
+	if v == version {
+		return 0
+	}
+	if v < version {
+		return -1
+	}
+	return 1
+}
diff --git a/common/hugo/version_current.go b/common/hugo/version_current.go
new file mode 100644
index 000000000..0a42f3023
--- /dev/null
+++ b/common/hugo/version_current.go
@@ -0,0 +1,22 @@
+// Copyright 2018 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 hugo
+
+// CurrentVersion represents the current build version.
+// This should be the only one.
+var CurrentVersion = Version{
+	Number:     0.53,
+	PatchLevel: 0,
+	Suffix:     "-DEV",
+}
diff --git a/common/hugo/version_test.go b/common/hugo/version_test.go
new file mode 100644
index 000000000..fb28750ec
--- /dev/null
+++ b/common/hugo/version_test.go
@@ -0,0 +1,70 @@
+// Copyright 2015 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 hugo
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestHugoVersion(t *testing.T) {
+	assert.Equal(t, "0.15-DEV", version(0.15, 0, "-DEV"))
+	assert.Equal(t, "0.15.2-DEV", version(0.15, 2, "-DEV"))
+
+	v := Version{Number: 0.21, PatchLevel: 0, Suffix: "-DEV"}
+
+	require.Equal(t, v.ReleaseVersion().String(), "0.21")
+	require.Equal(t, "0.21-DEV", v.String())
+	require.Equal(t, "0.22", v.Next().String())
+	nextVersionString := v.Next().Version()
+	require.Equal(t, "0.22", nextVersionString.String())
+	require.True(t, nextVersionString.Eq("0.22"))
+	require.False(t, nextVersionString.Eq("0.21"))
+	require.True(t, nextVersionString.Eq(nextVersionString))
+	require.Equal(t, "0.20.3", v.NextPatchLevel(3).String())
+}
+
+func TestCompareVersions(t *testing.T) {
+	require.Equal(t, 0, compareVersions(0.20, 0, 0.20))
+	require.Equal(t, 0, compareVersions(0.20, 0, float32(0.20)))
+	require.Equal(t, 0, compareVersions(0.20, 0, float64(0.20)))
+	require.Equal(t, 1, compareVersions(0.19, 1, 0.20))
+	require.Equal(t, 1, compareVersions(0.19, 3, "0.20.2"))
+	require.Equal(t, -1, compareVersions(0.19, 1, 0.01))
+	require.Equal(t, 1, compareVersions(0, 1, 3))
+	require.Equal(t, 1, compareVersions(0, 1, int32(3)))
+	require.Equal(t, 1, compareVersions(0, 1, int64(3)))
+	require.Equal(t, 0, compareVersions(0.20, 0, "0.20"))
+	require.Equal(t, 0, compareVersions(0.20, 1, "0.20.1"))
+	require.Equal(t, -1, compareVersions(0.20, 1, "0.20"))
+	require.Equal(t, 1, compareVersions(0.20, 0, "0.20.1"))
+	require.Equal(t, 1, compareVersions(0.20, 1, "0.20.2"))
+	require.Equal(t, 1, compareVersions(0.21, 1, "0.22.1"))
+	require.Equal(t, -1, compareVersions(0.22, 0, "0.22-DEV"))
+	require.Equal(t, 1, compareVersions(0.22, 0, "0.22.1-DEV"))
+	require.Equal(t, 1, compareVersionsWithSuffix(0.22, 0, "-DEV", "0.22"))
+	require.Equal(t, -1, compareVersionsWithSuffix(0.22, 1, "-DEV", "0.22"))
+	require.Equal(t, 0, compareVersionsWithSuffix(0.22, 1, "-DEV", "0.22.1-DEV"))
+
+}
+
+func TestParseHugoVersion(t *testing.T) {
+	require.Equal(t, "0.25", MustParseVersion("0.25").String())
+	require.Equal(t, "0.25.2", MustParseVersion("0.25.2").String())
+	require.Equal(t, "0.25-test", MustParseVersion("0.25-test").String())
+	require.Equal(t, "0.25-DEV", MustParseVersion("0.25-DEV").String())
+
+}