Merge c91c64a1aa into 68e95327f7

Bumps [github.com/pelletier/go-toml/v2](https://github.com/pelletier/go-toml) from 2.2.1 to 2.2.2.
- [Release notes](https://github.com/pelletier/go-toml/releases)
- [Changelog](https://github.com/pelletier/go-toml/blob/v2/.goreleaser.yaml)
- [Commits](https://github.com/pelletier/go-toml/compare/v2.2.1...v2.2.2)

---
updated-dependencies:
- dependency-name: github.com/pelletier/go-toml/v2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

docs/content/en/content-management/formats.md

@@ -43,7 +43,7 @@ Hugo passes reasonable default arguments to these external helpers by default:
 
 - `asciidoctor`: `--no-header-footer -`
 - `rst2html`: `--leave-comments --initial-header-level=2`
-- `pandoc`: `--mathjax`
+- `pandoc`: `--mathjax` and, for pandoc >= 2.11, `--citeproc`
 
 {{% note %}}
 Because additional formats are external commands, generation performance will rely heavily on the performance of the external tool you are using. As this feature is still in its infancy, feedback is welcome.
@@ -63,7 +63,59 @@ Some Asciidoctor parameters can be customized in Hugo. See [details].
 
 [details]: /getting-started/configuration-markup/#asciidoc
 
-## Learn markdown
+### External Helper Pandoc
+
+[Pandoc](https://pandoc.org) is a universal document converter and can be used to convert markdown files.
+In Hugo, Pandoc can be used for LaTeX-style math (the `--mathjax` command line option is provided):
+
+```
+---
+title: Math document
+---
+
+Some inline math: $a^2 + b^2 = c^2$.
+```
+
+This will render in your HTML as:
+
+```
+<p>Some inline math: <span class="math inline">\(a^2 + b^2 = c^2\)</span></p>
+```
+You will have to [add MathJax](https://www.mathjax.org/#gettingstarted) to your template to properly render the math.
+
+For **Pandoc >= 2.11**, you can use [citations](https://pandoc.org/MANUAL.html#extension-citations).
+One way is to employ [BibTeX files](https://en.wikibooks.org/wiki/LaTeX/Bibliography_Management#BibTeX) to cite:
+
+```
+---
+title: Citation document
+---
+---
+bibliography: assets/bibliography.bib
+...
+This is a citation: @Doe2022
+```
+
+Note that Hugo will **not** pass its metadata YAML block to Pandoc; however, it will pass the **second** meta data block, denoted with `---` and `...` to Pandoc.
+Thus, all Pandoc settings should go there.
+
+You can also add all elements from a bibliography file (without citing them explicitly) using:
+
+```
+---
+title: My Publications
+---
+---
+bibliography: assets/bibliography.bib
+nocite: |
+  @*
+...
+```
+
+It is also possible to provide a custom [CSL style](https://citationstyles.org/authors/) by passing `csl: path-to-style.csl` as a Pandoc option.
+
+
+## Learn Markdown
 
 Markdown syntax is simple enough to learn in a single sitting. The following are excellent resources to get you up and running:
 

go.mod

@@ -55,7 +55,7 @@ require (
 	github.com/niklasfasching/go-org v1.7.0
 	github.com/olekukonko/tablewriter v0.0.5
 	github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58
-	github.com/pelletier/go-toml/v2 v2.2.1
+	github.com/pelletier/go-toml/v2 v2.2.2
 	github.com/rogpeppe/go-internal v1.12.0
 	github.com/rwcarlsen/goexif v0.0.0-20190401172101-9e8deecbddbd
 	github.com/sanity-io/litter v1.5.5

go.sum

@@ -376,8 +376,8 @@ github.com/olekukonko/tablewriter v0.0.5 h1:P2Ga83D34wi1o9J6Wh1mRuqd4mF/x/lgBS7N
 github.com/olekukonko/tablewriter v0.0.5/go.mod h1:hPp6KlRPjbx+hW8ykQs1w3UBbZlj6HuIJcUGPhkA7kY=
 github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 h1:onHthvaw9LFnH4t2DcNVpwGmV9E1BkGknEliJkfwQj0=
 github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58/go.mod h1:DXv8WO4yhMYhSNPKjeNKa5WY9YCIEBRbNzFFPJbWO6Y=
-github.com/pelletier/go-toml/v2 v2.2.1 h1:9TA9+T8+8CUCO2+WYnDLCgrYi9+omqKXyjDtosvtEhg=
-github.com/pelletier/go-toml/v2 v2.2.1/go.mod h1:1t835xjRzz80PqgE6HHgN2JOsmgYu/h4qDAS4n929Rs=
+github.com/pelletier/go-toml/v2 v2.2.2 h1:aYUidT7k73Pcl9nb2gScu7NSrKCSHIDE89b3+6Wq+LM=
+github.com/pelletier/go-toml/v2 v2.2.2/go.mod h1:1t835xjRzz80PqgE6HHgN2JOsmgYu/h4qDAS4n929Rs=
 github.com/perimeterx/marshmallow v1.1.5 h1:a2LALqQ1BlHM8PZblsDdidgv1mWi1DgC2UmX50IvK2s=
 github.com/perimeterx/marshmallow v1.1.5/go.mod h1:dsXbUu8CRzfYP5a87xpp0xq9S3u0Vchtcl8we9tYaXw=
 github.com/pkg/browser v0.0.0-20210911075715-681adbf594b8 h1:KoWmjvw+nsYOo29YJK9vDA65RGE3NrOnUtO7a+RF9HU=

hugolib/page__common.go

@@ -67,6 +67,7 @@ type pageCommon struct {
 	page.InSectionPositioner
 	page.OutputFormatsProvider
 	page.PageMetaProvider
+	page.PageMetaInternalProvider
 	page.Positioner
 	page.RawContentProvider
 	page.RelatedKeywordsProvider

hugolib/page__new.go

@@ -184,6 +184,7 @@ func (h *HugoSites) newPage(m *pageMeta) (*pageState, *paths.Path, error) {
 				ResourceNameTitleProvider: m,
 				ResourceParamsProvider:    m,
 				PageMetaProvider:          m,
+				PageMetaInternalProvider:  m,
 				RelatedKeywordsProvider:   m,
 				OutputFormatsProvider:     page.NopPage,
 				ResourceTypeProvider:      pageTypesProvider,

hugoreleaser.env

@@ -1,7 +1,8 @@
 # Release env. 
 # These will be replaced by script before release.
-HUGORELEASER_TAG=v0.125.4
-HUGORELEASER_COMMITISH=cc3574ef4f41fccbe88d9443ed066eb10867ada2
+HUGORELEASER_TAG=v0.125.5
+HUGORELEASER_COMMITISH=c8b9f9f81c375f5b391e61bae711ee63fc76c1fd
+
 
 
 

markup/pandoc/convert.go

@@ -15,10 +15,14 @@
 package pandoc
 
 import (
+	"bytes"
+	"strconv"
+	"strings"
+	"sync"
+
 	"github.com/gohugoio/hugo/common/hexec"
 	"github.com/gohugoio/hugo/htesting"
 	"github.com/gohugoio/hugo/identity"
-
 	"github.com/gohugoio/hugo/markup/converter"
 	"github.com/gohugoio/hugo/markup/internal"
 )
@@ -64,6 +68,9 @@ func (c *pandocConverter) getPandocContent(src []byte, ctx converter.DocumentCon
 		return src, nil
 	}
 	args := []string{"--mathjax"}
+	if supportsCitations(c.cfg) {
+		args = append(args[:], "--citeproc")
+	}
 	return internal.ExternallyRenderContent(c.cfg, ctx, src, binaryName, args)
 }
 
@@ -76,6 +83,69 @@ func getPandocBinaryName() string {
 	return ""
 }
 
+type pandocVersion struct {
+	major, minor int64
+}
+
+func (left pandocVersion) greaterThanOrEqual(right pandocVersion) bool {
+	return left.major > right.major || (left.major == right.major && left.minor >= right.minor)
+}
+
+var versionOnce sync.Once
+var foundPandocVersion pandocVersion
+
+// getPandocVersion parses the pandoc version output
+func getPandocVersion(cfg converter.ProviderConfig) (pandocVersion, error) {
+	var err error
+
+	versionOnce.Do(func() {
+		argsv := []any{"--version"}
+
+		var out bytes.Buffer
+		argsv = append(argsv, hexec.WithStdout(&out))
+
+		cmd, err := cfg.Exec.New(pandocBinary, argsv...)
+		if err != nil {
+			cfg.Logger.Errorf("Could not call pandoc: %v", err)
+			foundPandocVersion = pandocVersion{0, 0}
+			return
+		}
+
+		err = cmd.Run()
+		if err != nil {
+			cfg.Logger.Errorf("%s --version: %v", pandocBinary, err)
+			foundPandocVersion = pandocVersion{0, 0}
+			return
+		}
+
+		outbytes := bytes.Replace(out.Bytes(), []byte("\r"), []byte(""), -1)
+		output := strings.Split(string(outbytes), "\n")[0]
+		// Split, e.g., "pandoc 2.5" into 2 and 5 and convert them to integers
+		versionStrings := strings.Split(strings.Split(output, " ")[1], ".")
+		majorVersion, err := strconv.ParseInt(versionStrings[0], 10, 64)
+		if err != nil {
+			println(err)
+		}
+		minorVersion, err := strconv.ParseInt(versionStrings[1], 10, 64)
+		if err != nil {
+			println(err)
+		}
+		foundPandocVersion = pandocVersion{majorVersion, minorVersion}
+	})
+
+	return foundPandocVersion, err
+}
+
+// SupportsCitations returns true for pandoc versions >= 2.11, which include citeproc
+func supportsCitations(cfg converter.ProviderConfig) bool {
+	if Supports() {
+		foundPandocVersion, err := getPandocVersion(cfg)
+		supportsCitations := foundPandocVersion.greaterThanOrEqual(pandocVersion{2, 11}) && err == nil
+		return supportsCitations
+	}
+	return false
+}
+
 // Supports returns whether Pandoc is installed on this computer.
 func Supports() bool {
 	hasBin := getPandocBinaryName() != ""

markup/pandoc/convert_test.go

@@ -25,7 +25,7 @@ import (
 	qt "github.com/frankban/quicktest"
 )
 
-func TestConvert(t *testing.T) {
+func setupTestConverter(t *testing.T) (*qt.C, converter.Converter, converter.ProviderConfig) {
 	if !Supports() {
 		t.Skip("pandoc not installed")
 	}
@@ -38,7 +38,140 @@ func TestConvert(t *testing.T) {
 	c.Assert(err, qt.IsNil)
 	conv, err := p.New(converter.DocumentContext{})
 	c.Assert(err, qt.IsNil)
-	b, err := conv.Convert(converter.RenderContext{Src: []byte("testContent")})
-	c.Assert(err, qt.IsNil)
-	c.Assert(string(b.Bytes()), qt.Equals, "<p>testContent</p>\n")
+	return c, conv, cfg
+}
+
+func TestConvert(t *testing.T) {
+	c, conv, _ := setupTestConverter(t)
+	output, err := conv.Convert(converter.RenderContext{Src: []byte("testContent")})
+	c.Assert(err, qt.IsNil)
+	c.Assert(string(output.Bytes()), qt.Equals, "<p>testContent</p>\n")
+}
+
+func runCiteprocTest(t *testing.T, content string, expected string) {
+	c, conv, cfg := setupTestConverter(t)
+	if !supportsCitations(cfg) {
+		t.Skip("pandoc does not support citations")
+	}
+	output, err := conv.Convert(converter.RenderContext{Src: []byte(content)})
+	c.Assert(err, qt.IsNil)
+	c.Assert(string(output.Bytes()), qt.Equals, expected)
+}
+
+func TestGetPandocVersionCallTwice(t *testing.T) {
+	c, _, cfg := setupTestConverter(t)
+
+	version1, err1 := getPandocVersion(cfg)
+	version2, err2 := getPandocVersion(cfg)
+	c.Assert(version1, qt.Equals, version2)
+	c.Assert(err1, qt.IsNil)
+	c.Assert(err2, qt.IsNil)
+}
+
+func TestPandocVersionEquality(t *testing.T) {
+	c := qt.New(t)
+	v1 := pandocVersion{1, 0}
+	v2 := pandocVersion{2, 0}
+	v3 := pandocVersion{2, 2}
+	v4 := pandocVersion{1, 2}
+	v5 := pandocVersion{2, 11}
+
+	// 1 >= 1 -> true
+	c.Assert(v1.greaterThanOrEqual(v1), qt.IsTrue)
+
+	// 1 >= 2 -> false, 2 >= 1 -> tru
+	c.Assert(v1.greaterThanOrEqual(v2), qt.IsFalse)
+	c.Assert(v2.greaterThanOrEqual(v1), qt.IsTrue)
+
+	// 2.0 >= 2.2 -> false, 2.2 >= 2.0 -> true
+	c.Assert(v2.greaterThanOrEqual(v3), qt.IsFalse)
+	c.Assert(v3.greaterThanOrEqual(v2), qt.IsTrue)
+
+	// 2.2 >= 1.2 -> true, 1.2 >= 2.2 -> false
+	c.Assert(v3.greaterThanOrEqual(v4), qt.IsTrue)
+	c.Assert(v4.greaterThanOrEqual(v3), qt.IsFalse)
+
+	// 2.11 >= 2.2 -> true, 2.2 >= 2.11 -> false
+	c.Assert(v5.greaterThanOrEqual(v3), qt.IsTrue)
+	c.Assert(v3.greaterThanOrEqual(v5), qt.IsFalse)
+}
+
+func TestCiteprocWithHugoMeta(t *testing.T) {
+	content := `
+---
+title: Test
+published: 2022-05-30
+---
+testContent
+`
+	expected := "<p>testContent</p>\n"
+	runCiteprocTest(t, content, expected)
+}
+
+func TestCiteprocWithPandocMeta(t *testing.T) {
+	content := `
+---
+---
+---
+...
+testContent
+`
+	expected := "<p>testContent</p>\n"
+	runCiteprocTest(t, content, expected)
+}
+
+func TestCiteprocWithBibliography(t *testing.T) {
+	content := `
+---
+---
+---
+bibliography: testdata/bibliography.bib
+...
+testContent
+`
+	expected := "<p>testContent</p>\n"
+	runCiteprocTest(t, content, expected)
+}
+
+func TestCiteprocWithExplicitCitation(t *testing.T) {
+	content := `
+---
+---
+---
+bibliography: testdata/bibliography.bib
+...
+@Doe2022
+`
+	expected := `<p><span class="citation" data-cites="Doe2022">Doe and Mustermann
+(2022)</span></p>
+<div id="refs" class="references csl-bib-body hanging-indent"
+role="doc-bibliography">
+<div id="ref-Doe2022" class="csl-entry" role="doc-biblioentry">
+Doe, Jane, and Max Mustermann. 2022. <span>“A Treatise on Hugo
+Tests.”</span> <em>Hugo Websites</em>.
+</div>
+</div>
+`
+	runCiteprocTest(t, content, expected)
+}
+
+func TestCiteprocWithNocite(t *testing.T) {
+	content := `
+---
+---
+---
+bibliography: testdata/bibliography.bib
+nocite: |
+  @*
+...
+`
+	expected := `<div id="refs" class="references csl-bib-body hanging-indent"
+role="doc-bibliography">
+<div id="ref-Doe2022" class="csl-entry" role="doc-biblioentry">
+Doe, Jane, and Max Mustermann. 2022. <span>“A Treatise on Hugo
+Tests.”</span> <em>Hugo Websites</em>.
+</div>
+</div>
+`
+	runCiteprocTest(t, content, expected)
 }

markup/pandoc/testdata/bibliography.bib

@@ -0,0 +1,6 @@
+@article{Doe2022,
+    author    = "Jane Doe and Max Mustermann",
+    title     = "A Treatise on Hugo Tests",
+    journal   = "Hugo Websites",
+    year      = "2022",
+}

resources/page/page.go

@@ -225,9 +225,6 @@ type PageMetaProvider interface {
 	// to the source of this Page. It will be relative to any content root.
 	Path() string
 
-	// This is for internal use only.
-	PathInfo() *paths.Path
-
 	// The slug, typically defined in front matter.
 	Slug() string
 
@@ -253,6 +250,12 @@ type PageMetaProvider interface {
 	Weight() int
 }
 
+// PageMetaInternalProvider provides internal page metadata.
+type PageMetaInternalProvider interface {
+	// This is for internal use only.
+	PathInfo() *paths.Path
+}
+
 // PageRenderProvider provides a way for a Page to render content.
 type PageRenderProvider interface {
 	// Render renders the given layout with this Page as context.
@@ -273,6 +276,7 @@ type PageWithoutContent interface {
 	RenderShortcodesProvider
 	resource.Resource
 	PageMetaProvider
+	PageMetaInternalProvider
 	resource.LanguageProvider
 
 	// For pages backed by a file.

resources/page/page_marshaljson.autogen.go

@@ -17,9 +17,8 @@ package page
 
 import (
 	"encoding/json"
-	"time"
-
 	"github.com/gohugoio/hugo/config"
+	"time"
 )
 
 func MarshalPageToJSON(p Page) ([]byte, error) {
@@ -39,7 +38,6 @@ func MarshalPageToJSON(p Page) ([]byte, error) {
 	isNode := p.IsNode()
 	isPage := p.IsPage()
 	path := p.Path()
-	pathc := p.Path()
 	slug := p.Slug()
 	lang := p.Lang()
 	isSection := p.IsSection()
@@ -65,7 +63,6 @@ func MarshalPageToJSON(p Page) ([]byte, error) {
 		IsNode      bool
 		IsPage      bool
 		Path        string
-		Pathc       string
 		Slug        string
 		Lang        string
 		IsSection   bool
@@ -90,7 +87,6 @@ func MarshalPageToJSON(p Page) ([]byte, error) {
 		IsNode:      isNode,
 		IsPage:      isPage,
 		Path:        path,
-		Pathc:       pathc,
 		Slug:        slug,
 		Lang:        lang,
 		IsSection:   isSection,