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outputFormat.go
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/
outputFormat.go
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package output
import (
"fmt"
"github.com/sunwei/hugo-playground/media"
"sort"
"strings"
)
// Format represents an output representation, usually to a file on disk.
type Format struct {
// The Name is used as an identifier. Internal output formats (i.e. HTML and RSS)
// can be overridden by providing a new definition for those types.
Name string `json:"name"`
MediaType media.Type `json:"-"`
// Must be set to a value when there are two or more conflicting mediatype for the same resource.
Path string `json:"path"`
// The base output file name used when not using "ugly URLs", defaults to "index".
BaseName string `json:"baseName"`
// The value to use for rel links
//
// See https://www.w3schools.com/tags/att_link_rel.asp
//
// AMP has a special requirement in this department, see:
// https://www.ampproject.org/docs/guides/deploy/discovery
// I.e.:
// <link rel="amphtml" href="https://www.example.com/url/to/amp/document.html">
Rel string `json:"rel"`
// The protocol to use, i.e. "webcal://". Defaults to the protocol of the baseURL.
Protocol string `json:"protocol"`
// IsPlainText decides whether to use text/template or html/template
// as template parser.
IsPlainText bool `json:"isPlainText"`
// IsHTML returns whether this format is int the HTML family. This includes
// HTML, AMP etc. This is used to decide when to create alias redirects etc.
IsHTML bool `json:"isHTML"`
// Enable if it doesn't make sense to include this format in an alternative
// format listing, CSS being one good example.
// Note that we use the term "alternative" and not "alternate" here, as it
// does not necessarily replace the other format, it is an alternative representation.
NotAlternative bool `json:"notAlternative"`
// Setting this will make this output format control the value of
// .Permalink and .RelPermalink for a rendered Page.
// If not set, these values will point to the main (first) output format
// configured. That is probably the behaviour you want in most situations,
// as you probably don't want to link back to the RSS version of a page, as an
// example. AMP would, however, be a good example of an output format where this
// behaviour is wanted.
Permalinkable bool `json:"permalinkable"`
// Setting this to a non-zero value will be used as the first sort criteria.
Weight int `json:"weight"`
}
// Formats is a slice of Format.
type Formats []Format
func (formats Formats) Len() int { return len(formats) }
func (formats Formats) Swap(i, j int) { formats[i], formats[j] = formats[j], formats[i] }
func (formats Formats) Less(i, j int) bool {
fi, fj := formats[i], formats[j]
if fi.Weight == fj.Weight {
return fi.Name < fj.Name
}
if fj.Weight == 0 {
return true
}
return fi.Weight > 0 && fi.Weight < fj.Weight
}
// GetByName gets a format by its identifier name.
func (formats Formats) GetByName(name string) (f Format, found bool) {
for _, ff := range formats {
if strings.EqualFold(name, ff.Name) {
f = ff
found = true
return
}
}
return
}
// An ordered list of built-in output formats.
var (
HTMLFormat = Format{
Name: "HTML",
MediaType: media.HTMLType,
BaseName: "index",
Rel: "canonical",
IsHTML: true,
Permalinkable: true,
// Weight will be used as first sort criteria. HTML will, by default,
// be rendered first, but set it to 10 so it's easy to put one above it.
Weight: 10,
}
MarkdownFormat = Format{
Name: "MARKDOWN",
MediaType: media.MarkdownType,
BaseName: "index",
Rel: "alternate",
IsPlainText: true,
}
JSONFormat = Format{
Name: "JSON",
MediaType: media.JSONType,
BaseName: "index",
IsPlainText: true,
Rel: "alternate",
}
RobotsTxtFormat = Format{
Name: "ROBOTS",
MediaType: media.TextType,
BaseName: "robots",
IsPlainText: true,
Rel: "alternate",
}
)
// DefaultFormats contains the default output formats supported by Hugo.
var DefaultFormats = Formats{
HTMLFormat,
JSONFormat,
MarkdownFormat,
}
// DecodeFormats takes a list of output format configurations and merges those,
// in the order given, with the Hugo defaults as the last resort.
func DecodeFormats(mediaTypes media.Types, maps ...map[string]any) (Formats, error) {
f := make(Formats, len(DefaultFormats))
copy(f, DefaultFormats)
// no customized formats map
sort.Sort(f)
return f, nil
}
// FromFilename gets a Format given a filename.
func (formats Formats) FromFilename(filename string) (f Format, found bool) {
// mytemplate.amp.html
// mytemplate.html
// mytemplate
var ext, outFormat string
parts := strings.Split(filename, ".")
if len(parts) > 2 {
outFormat = parts[1]
ext = parts[2]
} else if len(parts) > 1 {
ext = parts[1]
}
if outFormat != "" {
return formats.GetByName(outFormat)
}
if ext != "" {
f, found = formats.GetBySuffix(ext)
if !found && len(parts) == 2 {
// For extensionless output formats (e.g. Netlify's _redirects)
// we must fall back to using the extension as format lookup.
f, found = formats.GetByName(ext)
}
}
return
}
// GetBySuffix gets a output format 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 (formats Formats) GetBySuffix(suffix string) (f Format, found bool) {
for _, ff := range formats {
for _, suffix2 := range ff.MediaType.Suffixes() {
if strings.EqualFold(suffix, suffix2) {
if found {
// ambiguous
found = false
return
}
f = ff
found = true
}
}
}
return
}
// GetByNames gets a list of formats given a list of identifiers.
func (formats Formats) GetByNames(names ...string) (Formats, error) {
var types []Format
for _, name := range names {
tpe, ok := formats.GetByName(name)
if !ok {
return types, fmt.Errorf("OutputFormat with key %q not found", name)
}
types = append(types, tpe)
}
return types, nil
}