URI: 
       media: Make Type comparable - hugo - [fork] hugo port for 9front
  HTML git clone git@git.drkhsh.at/hugo.git
   DIR Log
   DIR Files
   DIR Refs
   DIR Submodules
   DIR README
   DIR LICENSE
       ---
   DIR commit ba1d0051b44fdd242b20899e195e37ab26501516
   DIR parent 1b1dcf586e220c3a8ad5ecfa8e4c3dac97f0ab44
  HTML Author: Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com>
       Date:   Thu, 11 Mar 2021 09:18:01 +0100
       
       media: Make Type comparable
       
       So we can use it and output.Format as map key etc.
       
       This commit also fixes the media.Type implementation so it does not need to mutate itself to handle different suffixes for the same MIME type, e.g. jpg vs. jpeg.
       
       This means that there are no Suffix or FullSuffix on media.Type anymore.
       
       Fixes #8317
       Fixes #8324
       
       Diffstat:
         M deploy/deploy.go                    |       2 +-
         M hugolib/config_test.go              |      10 ++++++----
         M hugolib/pagebundler_test.go         |       4 +---
         M hugolib/site.go                     |       2 +-
         M hugolib/site_output_test.go         |       3 ++-
         M media/mediaType.go                  |     198 +++++++++++++++++++------------
         M media/mediaType_test.go             |      98 +++++++++++++++++++------------
         M output/docshelper.go                |       2 +-
         M output/layout.go                    |       2 +-
         M output/layout_test.go               |       8 ++------
         M output/outputFormat.go              |      37 +++++++++++++++++++++----------
         M output/outputFormat_test.go         |      42 ++++++++++++-------------------
         M parser/metadecoders/format.go       |       2 +-
         M resources/images/image.go           |       2 +-
         M resources/page/page_paths.go        |      11 ++++++-----
         M resources/page/page_paths_test.go   |      11 +++++------
         M resources/postpub/fields_test.go    |      11 +++++------
         M resources/resource_spec.go          |       4 ++--
         M tpl/tplimpl/shortcodes.go           |       2 +-
       
       19 files changed, 255 insertions(+), 196 deletions(-)
       ---
   DIR diff --git a/deploy/deploy.go b/deploy/deploy.go
       @@ -432,7 +432,7 @@ func (lf *localFile) ContentType() string {
                }
        
                ext := filepath.Ext(lf.NativePath)
       -        if mimeType, found := lf.mediaTypes.GetFirstBySuffix(strings.TrimPrefix(ext, ".")); found {
       +        if mimeType, _, found := lf.mediaTypes.GetFirstBySuffix(strings.TrimPrefix(ext, ".")); found {
                        return mimeType.Type()
                }
        
   DIR diff --git a/hugolib/config_test.go b/hugolib/config_test.go
       @@ -220,8 +220,9 @@ map[string]interface {}{
              MainType: "text",
              SubType: "m1",
              Delimiter: ".",
       -      Suffixes: []string{
       -        "m1main",
       +      FirstSuffix: SuffixInfo{
       +        Suffix: "m1main",
       +        FullSuffix: ".m1main",
              },
            },
          },
       @@ -231,8 +232,9 @@ map[string]interface {}{
              MainType: "text",
              SubType: "m2",
              Delimiter: ".",
       -      Suffixes: []string{
       -        "m2theme",
       +      FirstSuffix: SuffixInfo{
       +        Suffix: "m2theme",
       +        FullSuffix: ".m2theme",
              },
            },
          },
   DIR diff --git a/hugolib/pagebundler_test.go b/hugolib/pagebundler_test.go
       @@ -34,8 +34,6 @@ import (
        
                "github.com/gohugoio/hugo/htesting"
        
       -        "github.com/gohugoio/hugo/media"
       -
                "github.com/gohugoio/hugo/deps"
                "github.com/spf13/viper"
        
       @@ -76,7 +74,7 @@ func TestPageBundlerSiteRegular(t *testing.T) {
        
                                                        cfg.Set("outputFormats", map[string]interface{}{
                                                                "CUSTOMO": map[string]interface{}{
       -                                                                "mediaType":     media.HTMLType,
       +                                                                "mediaType":     "text/html",
                                                                        "baseName":      "cindex",
                                                                        "path":          "cpath",
                                                                        "permalinkable": true,
   DIR diff --git a/hugolib/site.go b/hugolib/site.go
       @@ -913,7 +913,7 @@ type whatChanged struct {
        // package, so it will behave correctly with Hugo's built-in server.
        func (s *Site) RegisterMediaTypes() {
                for _, mt := range s.mediaTypesConfig {
       -                for _, suffix := range mt.Suffixes {
       +                for _, suffix := range mt.Suffixes() {
                                _ = mime.AddExtensionType(mt.Delimiter+suffix, mt.Type()+"; charset=utf-8")
                        }
                }
   DIR diff --git a/hugolib/site_output_test.go b/hugolib/site_output_test.go
       @@ -305,13 +305,14 @@ baseName = "customdelimbase"
        
                c.Assert(err, qt.IsNil)
        
       +        s := h.Sites[0]
       +
                th.assertFileContent("public/_redirects", "a dotless")
                th.assertFileContent("public/defaultdelimbase.defd", "default delimim")
                // This looks weird, but the user has chosen this definition.
                th.assertFileContent("public/nosuffixbase", "no suffix")
                th.assertFileContent("public/customdelimbase_del", "custom delim")
        
       -        s := h.Sites[0]
                home := s.getPage(page.KindHome)
                c.Assert(home, qt.Not(qt.IsNil))
        
   DIR diff --git a/media/mediaType.go b/media/mediaType.go
       @@ -20,6 +20,8 @@ import (
                "sort"
                "strings"
        
       +        "github.com/spf13/cast"
       +
                "github.com/gohugoio/hugo/common/maps"
        
                "github.com/mitchellh/mapstructure"
       @@ -36,28 +38,37 @@ const (
        // If suffix is not provided, the sub type will be used.
        // See // https://en.wikipedia.org/wiki/Media_type
        type Type struct {
       -        MainType string `json:"mainType"` // i.e. text
       -        SubType  string `json:"subType"`  // i.e. html
       +        MainType  string `json:"mainType"`  // i.e. text
       +        SubType   string `json:"subType"`   // i.e. html
       +        Delimiter string `json:"delimiter"` // e.g. "."
       +
       +        // FirstSuffix holds the first suffix defined for this Type.
       +        FirstSuffix SuffixInfo `json:"firstSuffix"`
        
                // This is the optional suffix after the "+" in the MIME type,
                //  e.g. "xml" in "application/rss+xml".
                mimeSuffix string
        
       -        Delimiter string `json:"delimiter"` // e.g. "."
       -
       -        Suffixes []string `json:"suffixes"`
       +        // E.g. "jpg,jpeg"
       +        // Stored as a string to make Type comparable.
       +        suffixesCSV string
       +}
        
       -        // Set when doing lookup by suffix.
       -        fileSuffix string
       +// SuffixInfo holds information about a Type's suffix.
       +type SuffixInfo struct {
       +        Suffix     string `json:"suffix"`
       +        FullSuffix string `json:"fullSuffix"`
        }
        
       -// FromStringAndExt is same as FromString, but adds the file extension to the type.
       +// FromStringAndExt creates a Type from a MIME string and a given extension.
        func FromStringAndExt(t, ext string) (Type, error) {
                tp, err := fromString(t)
                if err != nil {
                        return tp, err
                }
       -        tp.Suffixes = []string{strings.TrimPrefix(ext, ".")}
       +        tp.suffixesCSV = strings.TrimPrefix(ext, ".")
       +        tp.Delimiter = defaultDelimiter
       +        tp.init()
                return tp, nil
        }
        
       @@ -102,61 +113,83 @@ func (m Type) String() string {
                return m.Type()
        }
        
       -// FullSuffix returns the file suffix with any delimiter prepended.
       -func (m Type) FullSuffix() string {
       -        return m.Delimiter + m.Suffix()
       +// Suffixes returns all valid file suffixes for this type.
       +func (m Type) Suffixes() []string {
       +        if m.suffixesCSV == "" {
       +                return nil
       +        }
       +
       +        return strings.Split(m.suffixesCSV, ",")
        }
        
       -// Suffix returns the file suffix without any delimiter prepended.
       -func (m Type) Suffix() string {
       -        if m.fileSuffix != "" {
       -                return m.fileSuffix
       -        }
       -        if len(m.Suffixes) > 0 {
       -                return m.Suffixes[0]
       +func (m *Type) init() {
       +        m.FirstSuffix.FullSuffix = ""
       +        m.FirstSuffix.Suffix = ""
       +        if suffixes := m.Suffixes(); suffixes != nil {
       +                m.FirstSuffix.Suffix = suffixes[0]
       +                m.FirstSuffix.FullSuffix = m.Delimiter + m.FirstSuffix.Suffix
                }
       -        // There are MIME types without file suffixes.
       -        return ""
       +}
       +
       +// WithDelimiterAndSuffixes is used in tests.
       +func WithDelimiterAndSuffixes(t Type, delimiter, suffixesCSV string) Type {
       +        t.Delimiter = delimiter
       +        t.suffixesCSV = suffixesCSV
       +        t.init()
       +        return t
       +}
       +
       +func newMediaType(main, sub string, suffixes []string) Type {
       +        t := Type{MainType: main, SubType: sub, suffixesCSV: strings.Join(suffixes, ","), Delimiter: defaultDelimiter}
       +        t.init()
       +        return t
       +}
       +
       +func newMediaTypeWithMimeSuffix(main, sub, mimeSuffix string, suffixes []string) Type {
       +        mt := newMediaType(main, sub, suffixes)
       +        mt.mimeSuffix = mimeSuffix
       +        mt.init()
       +        return mt
        }
        
        // Definitions from https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types etc.
        // Note that from Hugo 0.44 we only set Suffix if it is part of the MIME type.
        var (
       -        CalendarType   = Type{MainType: "text", SubType: "calendar", Suffixes: []string{"ics"}, Delimiter: defaultDelimiter}
       -        CSSType        = Type{MainType: "text", SubType: "css", Suffixes: []string{"css"}, Delimiter: defaultDelimiter}
       -        SCSSType       = Type{MainType: "text", SubType: "x-scss", Suffixes: []string{"scss"}, Delimiter: defaultDelimiter}
       -        SASSType       = Type{MainType: "text", SubType: "x-sass", Suffixes: []string{"sass"}, Delimiter: defaultDelimiter}
       -        CSVType        = Type{MainType: "text", SubType: "csv", Suffixes: []string{"csv"}, Delimiter: defaultDelimiter}
       -        HTMLType       = Type{MainType: "text", SubType: "html", Suffixes: []string{"html"}, Delimiter: defaultDelimiter}
       -        JavascriptType = Type{MainType: "application", SubType: "javascript", Suffixes: []string{"js"}, Delimiter: defaultDelimiter}
       -        TypeScriptType = Type{MainType: "application", SubType: "typescript", Suffixes: []string{"ts"}, Delimiter: defaultDelimiter}
       -        TSXType        = Type{MainType: "text", SubType: "tsx", Suffixes: []string{"tsx"}, Delimiter: defaultDelimiter}
       -        JSXType        = Type{MainType: "text", SubType: "jsx", Suffixes: []string{"jsx"}, Delimiter: defaultDelimiter}
       -
       -        JSONType = Type{MainType: "application", SubType: "json", Suffixes: []string{"json"}, Delimiter: defaultDelimiter}
       -        RSSType  = Type{MainType: "application", SubType: "rss", mimeSuffix: "xml", Suffixes: []string{"xml"}, Delimiter: defaultDelimiter}
       -        XMLType  = Type{MainType: "application", SubType: "xml", Suffixes: []string{"xml"}, Delimiter: defaultDelimiter}
       -        SVGType  = Type{MainType: "image", SubType: "svg", mimeSuffix: "xml", Suffixes: []string{"svg"}, Delimiter: defaultDelimiter}
       -        TextType = Type{MainType: "text", SubType: "plain", Suffixes: []string{"txt"}, Delimiter: defaultDelimiter}
       -        TOMLType = Type{MainType: "application", SubType: "toml", Suffixes: []string{"toml"}, Delimiter: defaultDelimiter}
       -        YAMLType = Type{MainType: "application", SubType: "yaml", Suffixes: []string{"yaml", "yml"}, Delimiter: defaultDelimiter}
       +        CalendarType   = newMediaType("text", "calendar", []string{"ics"})
       +        CSSType        = newMediaType("text", "css", []string{"css"})
       +        SCSSType       = newMediaType("text", "x-scss", []string{"scss"})
       +        SASSType       = newMediaType("text", "x-sass", []string{"sass"})
       +        CSVType        = newMediaType("text", "csv", []string{"csv"})
       +        HTMLType       = newMediaType("text", "html", []string{"html"})
       +        JavascriptType = newMediaType("application", "javascript", []string{"js"})
       +        TypeScriptType = newMediaType("application", "typescript", []string{"ts"})
       +        TSXType        = newMediaType("text", "tsx", []string{"tsx"})
       +        JSXType        = newMediaType("text", "jsx", []string{"jsx"})
       +
       +        JSONType = newMediaType("application", "json", []string{"json"})
       +        RSSType  = newMediaTypeWithMimeSuffix("application", "rss", "xml", []string{"xml"})
       +        XMLType  = newMediaType("application", "xml", []string{"xml"})
       +        SVGType  = newMediaTypeWithMimeSuffix("image", "svg", "xml", []string{"svg"})
       +        TextType = newMediaType("text", "plain", []string{"txt"})
       +        TOMLType = newMediaType("application", "toml", []string{"toml"})
       +        YAMLType = newMediaType("application", "yaml", []string{"yaml", "yml"})
        
                // Common image types
       -        PNGType  = Type{MainType: "image", SubType: "png", Suffixes: []string{"png"}, Delimiter: defaultDelimiter}
       -        JPEGType = Type{MainType: "image", SubType: "jpeg", Suffixes: []string{"jpg", "jpeg"}, Delimiter: defaultDelimiter}
       -        GIFType  = Type{MainType: "image", SubType: "gif", Suffixes: []string{"gif"}, Delimiter: defaultDelimiter}
       -        TIFFType = Type{MainType: "image", SubType: "tiff", Suffixes: []string{"tif", "tiff"}, Delimiter: defaultDelimiter}
       -        BMPType  = Type{MainType: "image", SubType: "bmp", Suffixes: []string{"bmp"}, Delimiter: defaultDelimiter}
       +        PNGType  = newMediaType("image", "png", []string{"png"})
       +        JPEGType = newMediaType("image", "jpeg", []string{"jpg", "jpeg"})
       +        GIFType  = newMediaType("image", "gif", []string{"gif"})
       +        TIFFType = newMediaType("image", "tiff", []string{"tif", "tiff"})
       +        BMPType  = newMediaType("image", "bmp", []string{"bmp"})
        
                // Common video types
       -        AVIType  = Type{MainType: "video", SubType: "x-msvideo", Suffixes: []string{"avi"}, Delimiter: defaultDelimiter}
       -        MPEGType = Type{MainType: "video", SubType: "mpeg", Suffixes: []string{"mpg", "mpeg"}, Delimiter: defaultDelimiter}
       -        MP4Type  = Type{MainType: "video", SubType: "mp4", Suffixes: []string{"mp4"}, Delimiter: defaultDelimiter}
       -        OGGType  = Type{MainType: "video", SubType: "ogg", Suffixes: []string{"ogv"}, Delimiter: defaultDelimiter}
       -        WEBMType = Type{MainType: "video", SubType: "webm", Suffixes: []string{"webm"}, Delimiter: defaultDelimiter}
       -        GPPType  = Type{MainType: "video", SubType: "3gpp", Suffixes: []string{"3gpp", "3gp"}, Delimiter: defaultDelimiter}
       -
       -        OctetType = Type{MainType: "application", SubType: "octet-stream"}
       +        AVIType  = newMediaType("video", "x-msvideo", []string{"avi"})
       +        MPEGType = newMediaType("video", "mpeg", []string{"mpg", "mpeg"})
       +        MP4Type  = newMediaType("video", "mp4", []string{"mp4"})
       +        OGGType  = newMediaType("video", "ogg", []string{"ogv"})
       +        WEBMType = newMediaType("video", "webm", []string{"webm"})
       +        GPPType  = newMediaType("video", "3gpp", []string{"3gpp", "3gp"})
       +
       +        OctetType = newMediaType("application", "octet-stream", nil)
        )
        
        // DefaultTypes is the default media types supported by Hugo.
       @@ -221,54 +254,56 @@ func (t Types) GetByType(tp string) (Type, bool) {
        
        // BySuffix will return all media types matching a suffix.
        func (t Types) BySuffix(suffix string) []Type {
       +        suffix = strings.ToLower(suffix)
                var types []Type
                for _, tt := range t {
       -                if match := tt.matchSuffix(suffix); match != "" {
       +                if tt.hasSuffix(suffix) {
                                types = append(types, tt)
                        }
                }
                return types
        }
        
       -// GetFirstBySuffix will return the first media type matching the given suffix.
       -func (t Types) GetFirstBySuffix(suffix string) (Type, bool) {
       +// GetFirstBySuffix will return the first type matching the given suffix.
       +func (t Types) GetFirstBySuffix(suffix string) (Type, SuffixInfo, bool) {
       +        suffix = strings.ToLower(suffix)
                for _, tt := range t {
       -                if match := tt.matchSuffix(suffix); match != "" {
       -                        tt.fileSuffix = match
       -                        return tt, true
       +                if tt.hasSuffix(suffix) {
       +                        return tt, SuffixInfo{
       +                                FullSuffix: tt.Delimiter + suffix,
       +                                Suffix:     suffix,
       +                        }, true
                        }
                }
       -        return Type{}, false
       +        return Type{}, SuffixInfo{}, false
        }
        
        // GetBySuffix gets a media type given as suffix, e.g. "html".
        // It will return false if no format could be found, or if the suffix given
        // is ambiguous.
        // The lookup is case insensitive.
       -func (t Types) GetBySuffix(suffix string) (tp Type, found bool) {
       +func (t Types) GetBySuffix(suffix string) (tp Type, si SuffixInfo, found bool) {
       +        suffix = strings.ToLower(suffix)
                for _, tt := range t {
       -                if match := tt.matchSuffix(suffix); match != "" {
       +                if tt.hasSuffix(suffix) {
                                if found {
                                        // ambiguous
                                        found = false
                                        return
                                }
                                tp = tt
       -                        tp.fileSuffix = match
       +                        si = SuffixInfo{
       +                                FullSuffix: tt.Delimiter + suffix,
       +                                Suffix:     suffix,
       +                        }
                                found = true
                        }
                }
                return
        }
        
       -func (m Type) matchSuffix(suffix string) string {
       -        for _, s := range m.Suffixes {
       -                if strings.EqualFold(suffix, s) {
       -                        return s
       -                }
       -        }
       -
       -        return ""
       +func (m Type) hasSuffix(suffix string) bool {
       +        return strings.Contains(m.suffixesCSV, suffix)
        }
        
        // GetByMainSubType gets a media type given a main and a sub type e.g. "text" and "plain".
       @@ -328,9 +363,6 @@ func DecodeTypes(mms ...map[string]interface{}) (Types, error) {
                // Maps type string to Type. Type string is the full application/svg+xml.
                mmm := make(map[string]Type)
                for _, dt := range DefaultTypes {
       -                suffixes := make([]string, len(dt.Suffixes))
       -                copy(suffixes, dt.Suffixes)
       -                dt.Suffixes = suffixes
                        mmm[dt.Type()] = dt
                }
        
       @@ -360,11 +392,17 @@ func DecodeTypes(mms ...map[string]interface{}) (Types, error) {
                                        return Types{}, suffixIsRemoved()
                                }
        
       +                        if suffixes, found := vm["suffixes"]; found {
       +                                mediaType.suffixesCSV = strings.TrimSpace(strings.ToLower(strings.Join(cast.ToStringSlice(suffixes), ",")))
       +                        }
       +
                                // The user may set the delimiter as an empty string.
       -                        if !delimiterSet && len(mediaType.Suffixes) != 0 {
       +                        if !delimiterSet && mediaType.suffixesCSV != "" {
                                        mediaType.Delimiter = defaultDelimiter
                                }
        
       +                        mediaType.init()
       +
                                mmm[k] = mediaType
        
                        }
       @@ -387,12 +425,14 @@ func (m Type) IsZero() bool {
        func (m Type) MarshalJSON() ([]byte, error) {
                type Alias Type
                return json.Marshal(&struct {
       -                Type   string `json:"type"`
       -                String string `json:"string"`
                        Alias
       +                Type     string   `json:"type"`
       +                String   string   `json:"string"`
       +                Suffixes []string `json:"suffixes"`
                }{
       -                Type:   m.Type(),
       -                String: m.String(),
       -                Alias:  (Alias)(m),
       +                Alias:    (Alias)(m),
       +                Type:     m.Type(),
       +                String:   m.String(),
       +                Suffixes: strings.Split(m.suffixesCSV, ","),
                })
        }
   DIR diff --git a/media/mediaType_test.go b/media/mediaType_test.go
       @@ -14,16 +14,12 @@
        package media
        
        import (
       +        "encoding/json"
                "testing"
        
                qt "github.com/frankban/quicktest"
       -        "github.com/google/go-cmp/cmp"
        )
        
       -var eq = qt.CmpEquals(cmp.Comparer(func(m1, m2 Type) bool {
       -        return m1.Type() == m2.Type()
       -}))
       -
        func TestDefaultTypes(t *testing.T) {
                c := qt.New(t)
                for _, test := range []struct {
       @@ -53,8 +49,6 @@ func TestDefaultTypes(t *testing.T) {
                } {
                        c.Assert(test.tp.MainType, qt.Equals, test.expectedMainType)
                        c.Assert(test.tp.SubType, qt.Equals, test.expectedSubType)
       -                c.Assert(test.tp.Suffix(), qt.Equals, test.expectedSuffix)
       -                c.Assert(test.tp.Delimiter, qt.Equals, defaultDelimiter)
        
                        c.Assert(test.tp.Type(), qt.Equals, test.expectedType)
                        c.Assert(test.tp.String(), qt.Equals, test.expectedString)
       @@ -71,25 +65,25 @@ func TestGetByType(t *testing.T) {
        
                mt, found := types.GetByType("text/HTML")
                c.Assert(found, qt.Equals, true)
       -        c.Assert(HTMLType, eq, mt)
       +        c.Assert(HTMLType, qt.Equals, mt)
        
                _, found = types.GetByType("text/nono")
                c.Assert(found, qt.Equals, false)
        
                mt, found = types.GetByType("application/rss+xml")
                c.Assert(found, qt.Equals, true)
       -        c.Assert(RSSType, eq, mt)
       +        c.Assert(RSSType, qt.Equals, mt)
        
                mt, found = types.GetByType("application/rss")
                c.Assert(found, qt.Equals, true)
       -        c.Assert(RSSType, eq, mt)
       +        c.Assert(RSSType, qt.Equals, mt)
        }
        
        func TestGetByMainSubType(t *testing.T) {
                c := qt.New(t)
                f, found := DefaultTypes.GetByMainSubType("text", "plain")
                c.Assert(found, qt.Equals, true)
       -        c.Assert(TextType, eq, f)
       +        c.Assert(f, qt.Equals, TextType)
                _, found = DefaultTypes.GetByMainSubType("foo", "plain")
                c.Assert(found, qt.Equals, false)
        }
       @@ -104,48 +98,63 @@ func TestBySuffix(t *testing.T) {
        
        func TestGetFirstBySuffix(t *testing.T) {
                c := qt.New(t)
       -        f, found := DefaultTypes.GetFirstBySuffix("xml")
       +        _, f, found := DefaultTypes.GetFirstBySuffix("xml")
                c.Assert(found, qt.Equals, true)
       -        c.Assert(f, eq, Type{MainType: "application", SubType: "rss", mimeSuffix: "xml", Delimiter: ".", Suffixes: []string{"xml"}, fileSuffix: "xml"})
       +        c.Assert(f, qt.Equals, SuffixInfo{
       +                Suffix:     "xml",
       +                FullSuffix: ".xml"})
        }
        
        func TestFromTypeString(t *testing.T) {
                c := qt.New(t)
                f, err := fromString("text/html")
                c.Assert(err, qt.IsNil)
       -        c.Assert(f.Type(), eq, HTMLType.Type())
       +        c.Assert(f.Type(), qt.Equals, HTMLType.Type())
        
                f, err = fromString("application/custom")
                c.Assert(err, qt.IsNil)
       -        c.Assert(f, eq, Type{MainType: "application", SubType: "custom", mimeSuffix: "", fileSuffix: ""})
       +        c.Assert(f, qt.Equals, Type{MainType: "application", SubType: "custom", mimeSuffix: ""})
        
                f, err = fromString("application/custom+sfx")
                c.Assert(err, qt.IsNil)
       -        c.Assert(f, eq, Type{MainType: "application", SubType: "custom", mimeSuffix: "sfx"})
       +        c.Assert(f, qt.Equals, Type{MainType: "application", SubType: "custom", mimeSuffix: "sfx"})
        
                _, err = fromString("noslash")
                c.Assert(err, qt.Not(qt.IsNil))
        
                f, err = fromString("text/xml; charset=utf-8")
                c.Assert(err, qt.IsNil)
       -        c.Assert(f, eq, Type{MainType: "text", SubType: "xml", mimeSuffix: ""})
       -        c.Assert(f.Suffix(), qt.Equals, "")
       +
       +        c.Assert(f, qt.Equals, Type{MainType: "text", SubType: "xml", mimeSuffix: ""})
       +
       +}
       +
       +func TestFromStringAndExt(t *testing.T) {
       +        c := qt.New(t)
       +        f, err := FromStringAndExt("text/html", "html")
       +        c.Assert(err, qt.IsNil)
       +        c.Assert(f, qt.Equals, HTMLType)
       +        f, err = FromStringAndExt("text/html", ".html")
       +        c.Assert(err, qt.IsNil)
       +        c.Assert(f, qt.Equals, HTMLType)
        }
        
        // Add a test for the SVG case
        // https://github.com/gohugoio/hugo/issues/4920
        func TestFromExtensionMultipleSuffixes(t *testing.T) {
                c := qt.New(t)
       -        tp, found := DefaultTypes.GetBySuffix("svg")
       +        tp, si, found := DefaultTypes.GetBySuffix("svg")
                c.Assert(found, qt.Equals, true)
                c.Assert(tp.String(), qt.Equals, "image/svg+xml")
       -        c.Assert(tp.fileSuffix, qt.Equals, "svg")
       -        c.Assert(tp.FullSuffix(), qt.Equals, ".svg")
       -        tp, found = DefaultTypes.GetByType("image/svg+xml")
       +        c.Assert(si.Suffix, qt.Equals, "svg")
       +        c.Assert(si.FullSuffix, qt.Equals, ".svg")
       +        c.Assert(tp.FirstSuffix.Suffix, qt.Equals, si.Suffix)
       +        c.Assert(tp.FirstSuffix.FullSuffix, qt.Equals, si.FullSuffix)
       +        ftp, found := DefaultTypes.GetByType("image/svg+xml")
                c.Assert(found, qt.Equals, true)
       -        c.Assert(tp.String(), qt.Equals, "image/svg+xml")
       +        c.Assert(ftp.String(), qt.Equals, "image/svg+xml")
                c.Assert(found, qt.Equals, true)
       -        c.Assert(tp.FullSuffix(), qt.Equals, ".svg")
       +
        }
        
        func TestDecodeTypes(t *testing.T) {
       @@ -169,10 +178,10 @@ func TestDecodeTypes(t *testing.T) {
                                false,
                                func(t *testing.T, name string, tt Types) {
                                        c.Assert(len(tt), qt.Equals, len(DefaultTypes))
       -                                json, found := tt.GetBySuffix("jasn")
       +                                json, si, found := tt.GetBySuffix("jasn")
                                        c.Assert(found, qt.Equals, true)
                                        c.Assert(json.String(), qt.Equals, "application/json")
       -                                c.Assert(json.FullSuffix(), qt.Equals, ".jasn")
       +                                c.Assert(si.FullSuffix, qt.Equals, ".jasn")
                                },
                        },
                        {
       @@ -180,7 +189,7 @@ func TestDecodeTypes(t *testing.T) {
                                []map[string]interface{}{
                                        {
                                                "application/hugo+hg": map[string]interface{}{
       -                                                "suffixes":  []string{"hg1", "hg2"},
       +                                                "suffixes":  []string{"hg1", "hG2"},
                                                        "Delimiter": "_",
                                                },
                                        },
       @@ -188,15 +197,18 @@ func TestDecodeTypes(t *testing.T) {
                                false,
                                func(t *testing.T, name string, tt Types) {
                                        c.Assert(len(tt), qt.Equals, len(DefaultTypes)+1)
       -                                hg, found := tt.GetBySuffix("hg2")
       +                                hg, si, found := tt.GetBySuffix("hg2")
                                        c.Assert(found, qt.Equals, true)
                                        c.Assert(hg.mimeSuffix, qt.Equals, "hg")
       -                                c.Assert(hg.Suffix(), qt.Equals, "hg2")
       -                                c.Assert(hg.FullSuffix(), qt.Equals, "_hg2")
       +                                c.Assert(hg.FirstSuffix.Suffix, qt.Equals, "hg1")
       +                                c.Assert(hg.FirstSuffix.FullSuffix, qt.Equals, "_hg1")
       +                                c.Assert(si.Suffix, qt.Equals, "hg2")
       +                                c.Assert(si.FullSuffix, qt.Equals, "_hg2")
                                        c.Assert(hg.String(), qt.Equals, "application/hugo+hg")
        
       -                                hg, found = tt.GetByType("application/hugo+hg")
       +                                _, found = tt.GetByType("application/hugo+hg")
                                        c.Assert(found, qt.Equals, true)
       +
                                },
                        },
                        {
       @@ -209,14 +221,14 @@ func TestDecodeTypes(t *testing.T) {
                                        },
                                },
                                false,
       -                        func(t *testing.T, name string, tt Types) {
       -                                c.Assert(len(tt), qt.Equals, len(DefaultTypes)+1)
       +                        func(t *testing.T, name string, tp Types) {
       +                                c.Assert(len(tp), qt.Equals, len(DefaultTypes)+1)
                                        // Make sure we have not broken the default config.
        
       -                                _, found := tt.GetBySuffix("json")
       +                                _, _, found := tp.GetBySuffix("json")
                                        c.Assert(found, qt.Equals, true)
        
       -                                hugo, found := tt.GetBySuffix("hgo2")
       +                                hugo, _, found := tp.GetBySuffix("hgo2")
                                        c.Assert(found, qt.Equals, true)
                                        c.Assert(hugo.String(), qt.Equals, "text/hugo+hgo")
                                },
       @@ -234,25 +246,33 @@ func TestDecodeTypes(t *testing.T) {
                }
        }
        
       +func TestToJSON(t *testing.T) {
       +        c := qt.New(t)
       +        b, err := json.Marshal(MPEGType)
       +        c.Assert(err, qt.IsNil)
       +        c.Assert(string(b), qt.Equals, `{"mainType":"video","subType":"mpeg","delimiter":".","firstSuffix":{"suffix":"mpg","fullSuffix":".mpg"},"type":"video/mpeg","string":"video/mpeg","suffixes":["mpg","mpeg"]}`)
       +}
       +
        func BenchmarkTypeOps(b *testing.B) {
                mt := MPEGType
                mts := DefaultTypes
                for i := 0; i < b.N; i++ {
       -                _ = mt.FullSuffix()
       +                ff := mt.FirstSuffix
       +                _ = ff.FullSuffix
                        _ = mt.IsZero()
                        c, err := mt.MarshalJSON()
                        if c == nil || err != nil {
                                b.Fatal("failed")
                        }
                        _ = mt.String()
       -                _ = mt.Suffix()
       +                _ = ff.Suffix
                        _ = mt.Suffixes
                        _ = mt.Type()
                        _ = mts.BySuffix("xml")
                        _, _ = mts.GetByMainSubType("application", "xml")
       -                _, _ = mts.GetBySuffix("xml")
       +                _, _, _ = mts.GetBySuffix("xml")
                        _, _ = mts.GetByType("application")
       -                _, _ = mts.GetFirstBySuffix("xml")
       +                _, _, _ = mts.GetFirstBySuffix("xml")
        
                }
        }
   DIR diff --git a/output/docshelper.go b/output/docshelper.go
       @@ -76,7 +76,7 @@ func createLayoutExamples() interface{} {
                                Example:      example.name,
                                Kind:         example.d.Kind,
                                OutputFormat: example.f.Name,
       -                        Suffix:       example.f.MediaType.Suffix(),
       +                        Suffix:       example.f.MediaType.FirstSuffix.Suffix,
                                Layouts:      makeLayoutsPresentable(layouts),
                        })
                }
   DIR diff --git a/output/layout.go b/output/layout.go
       @@ -229,7 +229,7 @@ func (l *layoutBuilder) resolveVariations() []string {
                                                continue
                                        }
        
       -                                s := constructLayoutPath(typeVar, layoutVar, variation, l.f.MediaType.Suffix())
       +                                s := constructLayoutPath(typeVar, layoutVar, variation, l.f.MediaType.FirstSuffix.Suffix)
                                        if s != "" {
                                                layouts = append(layouts, s)
                                        }
   DIR diff --git a/output/layout_test.go b/output/layout_test.go
       @@ -28,12 +28,8 @@ import (
        func TestLayout(t *testing.T) {
                c := qt.New(t)
        
       -        noExtNoDelimMediaType := media.TextType
       -        noExtNoDelimMediaType.Suffixes = nil
       -        noExtNoDelimMediaType.Delimiter = ""
       -
       -        noExtMediaType := media.TextType
       -        noExtMediaType.Suffixes = nil
       +        noExtNoDelimMediaType := media.WithDelimiterAndSuffixes(media.TextType, "", "")
       +        noExtMediaType := media.WithDelimiterAndSuffixes(media.TextType, ".", "")
        
                var (
                        ampType = Format{
   DIR diff --git a/output/outputFormat.go b/output/outputFormat.go
       @@ -20,6 +20,8 @@ import (
                "sort"
                "strings"
        
       +        "github.com/pkg/errors"
       +
                "github.com/mitchellh/mapstructure"
        
                "github.com/gohugoio/hugo/media"
       @@ -207,14 +209,16 @@ func (formats Formats) Less(i, j int) bool {
        // The lookup is case insensitive.
        func (formats Formats) GetBySuffix(suffix string) (f Format, found bool) {
                for _, ff := range formats {
       -                if strings.EqualFold(suffix, ff.MediaType.Suffix()) {
       -                        if found {
       -                                // ambiguous
       -                                found = false
       -                                return
       +                for _, suffix2 := range ff.MediaType.Suffixes() {
       +                        if strings.EqualFold(suffix, suffix2) {
       +                                if found {
       +                                        // ambiguous
       +                                        found = false
       +                                        return
       +                                }
       +                                f = ff
       +                                found = true
                                }
       -                        f = ff
       -                        found = true
                        }
                }
                return
       @@ -310,6 +314,7 @@ func DecodeFormats(mediaTypes media.Types, maps ...map[string]interface{}) (Form
                                        }
        
                                        f = append(f, newOutFormat)
       +
                                }
                        }
                }
       @@ -319,7 +324,7 @@ func DecodeFormats(mediaTypes media.Types, maps ...map[string]interface{}) (Form
                return f, nil
        }
        
       -func decode(mediaTypes media.Types, input, output interface{}) error {
       +func decode(mediaTypes media.Types, input interface{}, output *Format) error {
                config := &mapstructure.DecoderConfig{
                        Metadata:         nil,
                        Result:           output,
       @@ -337,12 +342,19 @@ func decode(mediaTypes media.Types, input, output interface{}) error {
                                                        // If mediaType is a string, look it up and replace it
                                                        // in the map.
                                                        vv := dataVal.MapIndex(key)
       -                                                if mediaTypeStr, ok := vv.Interface().(string); ok {
       -                                                        mediaType, found := mediaTypes.GetByType(mediaTypeStr)
       +                                                vvi := vv.Interface()
       +
       +                                                switch vviv := vvi.(type) {
       +                                                case media.Type:
       +                                                // OK
       +                                                case string:
       +                                                        mediaType, found := mediaTypes.GetByType(vviv)
                                                                if !found {
       -                                                                return c, fmt.Errorf("media type %q not found", mediaTypeStr)
       +                                                                return c, fmt.Errorf("media type %q not found", vviv)
                                                                }
                                                                dataVal.SetMapIndex(key, reflect.ValueOf(mediaType))
       +                                                default:
       +                                                        return nil, errors.Errorf("invalid output format configuration; wrong type for media type, expected string (e.g. text/html), got %T", vvi)
                                                        }
                                                }
                                        }
       @@ -357,12 +369,13 @@ func decode(mediaTypes media.Types, input, output interface{}) error {
                }
        
                return decoder.Decode(input)
       +
        }
        
        // BaseFilename returns the base filename of f including an extension (ie.
        // "index.xml").
        func (f Format) BaseFilename() string {
       -        return f.BaseName + f.MediaType.FullSuffix()
       +        return f.BaseName + f.MediaType.FirstSuffix.FullSuffix
        }
        
        // MarshalJSON returns the JSON encoding of f.
   DIR diff --git a/output/outputFormat_test.go b/output/outputFormat_test.go
       @@ -19,36 +19,26 @@ import (
        
                qt "github.com/frankban/quicktest"
                "github.com/gohugoio/hugo/media"
       -        "github.com/google/go-cmp/cmp"
       -)
       -
       -var eq = qt.CmpEquals(
       -        cmp.Comparer(func(m1, m2 media.Type) bool {
       -                return m1.Type() == m2.Type()
       -        }),
       -        cmp.Comparer(func(o1, o2 Format) bool {
       -                return o1.Name == o2.Name
       -        }),
        )
        
        func TestDefaultTypes(t *testing.T) {
                c := qt.New(t)
                c.Assert(CalendarFormat.Name, qt.Equals, "Calendar")
       -        c.Assert(CalendarFormat.MediaType, eq, media.CalendarType)
       +        c.Assert(CalendarFormat.MediaType, qt.Equals, media.CalendarType)
                c.Assert(CalendarFormat.Protocol, qt.Equals, "webcal://")
                c.Assert(CalendarFormat.Path, qt.HasLen, 0)
                c.Assert(CalendarFormat.IsPlainText, qt.Equals, true)
                c.Assert(CalendarFormat.IsHTML, qt.Equals, false)
        
                c.Assert(CSSFormat.Name, qt.Equals, "CSS")
       -        c.Assert(CSSFormat.MediaType, eq, media.CSSType)
       +        c.Assert(CSSFormat.MediaType, qt.Equals, media.CSSType)
                c.Assert(CSSFormat.Path, qt.HasLen, 0)
                c.Assert(CSSFormat.Protocol, qt.HasLen, 0) // Will inherit the BaseURL protocol.
                c.Assert(CSSFormat.IsPlainText, qt.Equals, true)
                c.Assert(CSSFormat.IsHTML, qt.Equals, false)
        
                c.Assert(CSVFormat.Name, qt.Equals, "CSV")
       -        c.Assert(CSVFormat.MediaType, eq, media.CSVType)
       +        c.Assert(CSVFormat.MediaType, qt.Equals, media.CSVType)
                c.Assert(CSVFormat.Path, qt.HasLen, 0)
                c.Assert(CSVFormat.Protocol, qt.HasLen, 0)
                c.Assert(CSVFormat.IsPlainText, qt.Equals, true)
       @@ -56,7 +46,7 @@ func TestDefaultTypes(t *testing.T) {
                c.Assert(CSVFormat.Permalinkable, qt.Equals, false)
        
                c.Assert(HTMLFormat.Name, qt.Equals, "HTML")
       -        c.Assert(HTMLFormat.MediaType, eq, media.HTMLType)
       +        c.Assert(HTMLFormat.MediaType, qt.Equals, media.HTMLType)
                c.Assert(HTMLFormat.Path, qt.HasLen, 0)
                c.Assert(HTMLFormat.Protocol, qt.HasLen, 0)
                c.Assert(HTMLFormat.IsPlainText, qt.Equals, false)
       @@ -64,7 +54,7 @@ func TestDefaultTypes(t *testing.T) {
                c.Assert(AMPFormat.Permalinkable, qt.Equals, true)
        
                c.Assert(AMPFormat.Name, qt.Equals, "AMP")
       -        c.Assert(AMPFormat.MediaType, eq, media.HTMLType)
       +        c.Assert(AMPFormat.MediaType, qt.Equals, media.HTMLType)
                c.Assert(AMPFormat.Path, qt.Equals, "amp")
                c.Assert(AMPFormat.Protocol, qt.HasLen, 0)
                c.Assert(AMPFormat.IsPlainText, qt.Equals, false)
       @@ -72,7 +62,7 @@ func TestDefaultTypes(t *testing.T) {
                c.Assert(AMPFormat.Permalinkable, qt.Equals, true)
        
                c.Assert(RSSFormat.Name, qt.Equals, "RSS")
       -        c.Assert(RSSFormat.MediaType, eq, media.RSSType)
       +        c.Assert(RSSFormat.MediaType, qt.Equals, media.RSSType)
                c.Assert(RSSFormat.Path, qt.HasLen, 0)
                c.Assert(RSSFormat.IsPlainText, qt.Equals, false)
                c.Assert(RSSFormat.NoUgly, qt.Equals, true)
       @@ -83,7 +73,7 @@ func TestGetFormatByName(t *testing.T) {
                c := qt.New(t)
                formats := Formats{AMPFormat, CalendarFormat}
                tp, _ := formats.GetByName("AMp")
       -        c.Assert(tp, eq, AMPFormat)
       +        c.Assert(tp, qt.Equals, AMPFormat)
                _, found := formats.GetByName("HTML")
                c.Assert(found, qt.Equals, false)
                _, found = formats.GetByName("FOO")
       @@ -95,9 +85,9 @@ func TestGetFormatByExt(t *testing.T) {
                formats1 := Formats{AMPFormat, CalendarFormat}
                formats2 := Formats{AMPFormat, HTMLFormat, CalendarFormat}
                tp, _ := formats1.GetBySuffix("html")
       -        c.Assert(tp, eq, AMPFormat)
       +        c.Assert(tp, qt.Equals, AMPFormat)
                tp, _ = formats1.GetBySuffix("ics")
       -        c.Assert(tp, eq, CalendarFormat)
       +        c.Assert(tp, qt.Equals, CalendarFormat)
                _, found := formats1.GetBySuffix("not")
                c.Assert(found, qt.Equals, false)
        
       @@ -129,18 +119,18 @@ func TestGetFormatByFilename(t *testing.T) {
                formats := Formats{AMPFormat, HTMLFormat, noExtDelimFormat, noExt, CalendarFormat}
                f, found := formats.FromFilename("my.amp.html")
                c.Assert(found, qt.Equals, true)
       -        c.Assert(f, eq, AMPFormat)
       +        c.Assert(f, qt.Equals, AMPFormat)
                _, found = formats.FromFilename("my.ics")
                c.Assert(found, qt.Equals, true)
                f, found = formats.FromFilename("my.html")
                c.Assert(found, qt.Equals, true)
       -        c.Assert(f, eq, HTMLFormat)
       +        c.Assert(f, qt.Equals, HTMLFormat)
                f, found = formats.FromFilename("my.nem")
                c.Assert(found, qt.Equals, true)
       -        c.Assert(f, eq, noExtDelimFormat)
       +        c.Assert(f, qt.Equals, noExtDelimFormat)
                f, found = formats.FromFilename("my.nex")
                c.Assert(found, qt.Equals, true)
       -        c.Assert(f, eq, noExt)
       +        c.Assert(f, qt.Equals, noExt)
                _, found = formats.FromFilename("my.css")
                c.Assert(found, qt.Equals, false)
        }
       @@ -172,7 +162,7 @@ func TestDecodeFormats(t *testing.T) {
                                        c.Assert(len(f), qt.Equals, len(DefaultFormats), msg)
                                        json, _ := f.GetByName("JSON")
                                        c.Assert(json.BaseName, qt.Equals, "myindex")
       -                                c.Assert(json.MediaType, eq, media.JSONType)
       +                                c.Assert(json.MediaType, qt.Equals, media.JSONType)
                                        c.Assert(json.IsPlainText, qt.Equals, false)
                                },
                        },
       @@ -192,7 +182,7 @@ func TestDecodeFormats(t *testing.T) {
                                        xml, found := f.GetByName("MYXMLFORMAT")
                                        c.Assert(found, qt.Equals, true)
                                        c.Assert(xml.BaseName, qt.Equals, "myxml")
       -                                c.Assert(xml.MediaType, eq, media.XMLType)
       +                                c.Assert(xml.MediaType, qt.Equals, media.XMLType)
        
                                        // Verify that we haven't changed the DefaultFormats slice.
                                        json, _ := f.GetByName("JSON")
       @@ -234,7 +224,7 @@ func TestDecodeFormats(t *testing.T) {
                                        xml, found := f.GetByName("MYOTHERXMLFORMAT")
                                        c.Assert(found, qt.Equals, true)
                                        c.Assert(xml.BaseName, qt.Equals, "myredefined")
       -                                c.Assert(xml.MediaType, eq, media.XMLType)
       +                                c.Assert(xml.MediaType, qt.Equals, media.XMLType)
                                },
                        },
                }
   DIR diff --git a/parser/metadecoders/format.go b/parser/metadecoders/format.go
       @@ -59,7 +59,7 @@ func FormatFromString(formatStr string) Format {
        // FormatFromMediaType gets the Format given a MIME type, empty string
        // if unknown.
        func FormatFromMediaType(m media.Type) Format {
       -        for _, suffix := range m.Suffixes {
       +        for _, suffix := range m.Suffixes() {
                        if f := FormatFromString(suffix); f != "" {
                                return f
                        }
   DIR diff --git a/resources/images/image.go b/resources/images/image.go
       @@ -265,7 +265,7 @@ func (f Format) SupportsTransparency() bool {
        // DefaultExtension returns the default file extension of this format, starting with a dot.
        // For example: .jpg for JPEG
        func (f Format) DefaultExtension() string {
       -        return f.MediaType().FullSuffix()
       +        return f.MediaType().FirstSuffix.FullSuffix
        }
        
        // MediaType returns the media type of this image, e.g. image/jpeg for JPEG
   DIR diff --git a/resources/page/page_paths.go b/resources/page/page_paths.go
       @@ -128,6 +128,7 @@ func CreateTargetPaths(d TargetPathDescriptor) (tp TargetPaths) {
                }
        
                pagePath := slash
       +        fullSuffix := d.Type.MediaType.FirstSuffix.FullSuffix
        
                var (
                        pagePathDir string
       @@ -172,7 +173,7 @@ func CreateTargetPaths(d TargetPathDescriptor) (tp TargetPaths) {
                        hasSlash := strings.HasSuffix(d.URL, slash)
        
                        if hasSlash || !hasDot {
       -                        pagePath = pjoin(pagePath, d.Type.BaseName+d.Type.MediaType.FullSuffix())
       +                        pagePath = pjoin(pagePath, d.Type.BaseName+fullSuffix)
                        } else if hasDot {
                                pagePathDir = path.Dir(pagePathDir)
                        }
       @@ -229,9 +230,9 @@ func CreateTargetPaths(d TargetPathDescriptor) (tp TargetPaths) {
                        linkDir = pagePathDir
        
                        if isUgly {
       -                        pagePath = addSuffix(pagePath, d.Type.MediaType.FullSuffix())
       +                        pagePath = addSuffix(pagePath, fullSuffix)
                        } else {
       -                        pagePath = pjoin(pagePath, d.Type.BaseName+d.Type.MediaType.FullSuffix())
       +                        pagePath = pjoin(pagePath, d.Type.BaseName+fullSuffix)
                        }
        
                        if !isHtmlIndex(pagePath) {
       @@ -267,9 +268,9 @@ func CreateTargetPaths(d TargetPathDescriptor) (tp TargetPaths) {
                        linkDir = pagePathDir
        
                        if base != "" {
       -                        pagePath = path.Join(pagePath, addSuffix(base, d.Type.MediaType.FullSuffix()))
       +                        pagePath = path.Join(pagePath, addSuffix(base, fullSuffix))
                        } else {
       -                        pagePath = addSuffix(pagePath, d.Type.MediaType.FullSuffix())
       +                        pagePath = addSuffix(pagePath, fullSuffix)
                        }
        
                        if !isHtmlIndex(pagePath) {
   DIR diff --git a/resources/page/page_paths_test.go b/resources/page/page_paths_test.go
       @@ -27,8 +27,7 @@ import (
        func TestPageTargetPath(t *testing.T) {
                pathSpec := newTestPathSpec()
        
       -        noExtNoDelimMediaType := media.TextType
       -        noExtNoDelimMediaType.Suffixes = []string{}
       +        noExtNoDelimMediaType := media.WithDelimiterAndSuffixes(media.TextType, "", "")
                noExtNoDelimMediaType.Delimiter = ""
        
                // Netlify style _redirects
       @@ -209,11 +208,11 @@ func TestPageTargetPath(t *testing.T) {
                                                                // TODO(bep) simplify
                                                                if test.d.Kind == KindPage && test.d.BaseName == test.d.Type.BaseName {
                                                                } else if test.d.Kind == KindHome && test.d.Type.Path != "" {
       -                                                        } else if test.d.Type.MediaType.Suffix() != "" && (!strings.HasPrefix(expected.TargetFilename, "/index") || test.d.Addends != "") && test.d.URL == "" && isUgly {
       +                                                        } else if test.d.Type.MediaType.FirstSuffix.Suffix != "" && (!strings.HasPrefix(expected.TargetFilename, "/index") || test.d.Addends != "") && test.d.URL == "" && isUgly {
                                                                        expected.TargetFilename = strings.Replace(expected.TargetFilename,
       -                                                                        "/"+test.d.Type.BaseName+"."+test.d.Type.MediaType.Suffix(),
       -                                                                        "."+test.d.Type.MediaType.Suffix(), 1)
       -                                                                expected.Link = strings.TrimSuffix(expected.Link, "/") + "." + test.d.Type.MediaType.Suffix()
       +                                                                        "/"+test.d.Type.BaseName+"."+test.d.Type.MediaType.FirstSuffix.Suffix,
       +                                                                        "."+test.d.Type.MediaType.FirstSuffix.Suffix, 1)
       +                                                                expected.Link = strings.TrimSuffix(expected.Link, "/") + "." + test.d.Type.MediaType.FirstSuffix.Suffix
        
                                                                }
        
   DIR diff --git a/resources/postpub/fields_test.go b/resources/postpub/fields_test.go
       @@ -31,15 +31,14 @@ func TestCreatePlaceholders(t *testing.T) {
                })
        
                c.Assert(m, qt.DeepEquals, map[string]interface{}{
       -                "FullSuffix":  "pre_foo.FullSuffix_post",
                        "IsZero":      "pre_foo.IsZero_post",
       -                "Type":        "pre_foo.Type_post",
       -                "MainType":    "pre_foo.MainType_post",
       -                "Delimiter":   "pre_foo.Delimiter_post",
                        "MarshalJSON": "pre_foo.MarshalJSON_post",
       +                "Suffixes":    "pre_foo.Suffixes_post",
       +                "Delimiter":   "pre_foo.Delimiter_post",
       +                "FirstSuffix": "pre_foo.FirstSuffix_post",
                        "String":      "pre_foo.String_post",
       -                "Suffix":      "pre_foo.Suffix_post",
       +                "Type":        "pre_foo.Type_post",
       +                "MainType":    "pre_foo.MainType_post",
                        "SubType":     "pre_foo.SubType_post",
       -                "Suffixes":    "pre_foo.Suffixes_post",
                })
        }
   DIR diff --git a/resources/resource_spec.go b/resources/resource_spec.go
       @@ -268,10 +268,10 @@ func (r *Spec) newResource(sourceFs afero.Fs, fd ResourceSourceDescriptor) (reso
                }
        
                ext := strings.ToLower(filepath.Ext(fd.RelTargetFilename))
       -        mimeType, found := r.MediaTypes.GetFirstBySuffix(strings.TrimPrefix(ext, "."))
       +        mimeType, suffixInfo, found := r.MediaTypes.GetFirstBySuffix(strings.TrimPrefix(ext, "."))
                // TODO(bep) we need to handle these ambiguous types better, but in this context
                // we most likely want the application/xml type.
       -        if mimeType.Suffix() == "xml" && mimeType.SubType == "rss" {
       +        if suffixInfo.Suffix == "xml" && mimeType.SubType == "rss" {
                        mimeType, found = r.MediaTypes.GetByType("application/xml")
                }
        
   DIR diff --git a/tpl/tplimpl/shortcodes.go b/tpl/tplimpl/shortcodes.go
       @@ -56,7 +56,7 @@ func (s *shortcodeTemplates) fromVariants(variants tpl.TemplateVariants) (shortc
                return s.fromVariantsSlice([]string{
                        variants.Language,
                        strings.ToLower(variants.OutputFormat.Name),
       -                variants.OutputFormat.MediaType.Suffix(),
       +                variants.OutputFormat.MediaType.FirstSuffix.Suffix,
                })
        }