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Published: Sep 4, 2019 License: Apache-2.0 Imports: 54 Imported by: 705



Package helpers implements general utility functions that work with and on content. The helper functions defined here lay down the foundation of how Hugo works with files and filepaths, and perform string operations on content.



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const FilePathSeparator = string(filepath.Separator)

FilePathSeparator as defined by os.Separator.


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var (
	// DistinctErrorLog can be used to avoid spamming the logs with errors.
	DistinctErrorLog = NewDistinctErrorLogger()

	// DistinctWarnLog can be used to avoid spamming the logs with warnings.
	DistinctWarnLog = NewDistinctWarnLogger()

	// DistinctFeedbackLog can be used to avoid spamming the logs with info messages.
	DistinctFeedbackLog = NewDistinctFeedbackLogger()
View Source
var (
	// ErrThemeUndefined is returned when a theme has not be defined by the user.
	ErrThemeUndefined = errors.New("no theme set")
View Source
var SummaryDivider = []byte("<!--more-->")

SummaryDivider denotes where content summarization should end. The default is "<!--more-->".


func AddContextRoot

func AddContextRoot(baseURL, relativePath string) string

AddContextRoot adds the context root to an URL if it's not already set. For relative URL entries on sites with a base url with a context root set (i.e., relative URLs must not include the context root if canonifyURLs is enabled. But if it's disabled, it must be set.

func BytesToHTML

func BytesToHTML(b []byte) template.HTML

BytesToHTML converts bytes to type template.HTML.

func Deprecated

func Deprecated(object, item, alternative string, err bool)

Deprecated informs about a deprecation, but only once for a given set of arguments' values. If the err flag is enabled, it logs as an ERROR (will exit with -1) and the text will point at the next Hugo release. The idea is two remove an item in two Hugo releases to give users and theme authors plenty of time to fix their templates.

func DiffStringSlices

func DiffStringSlices(slice1 []string, slice2 []string) []string

DiffStringSlices returns the difference between two string slices. Useful in tests. See:

func DiffStrings added in v0.37.1

func DiffStrings(s1, s2 string) []string

DiffStrings splits the strings into fields and runs it into DiffStringSlices. Useful for tests.

func DirExists

func DirExists(path string, fs afero.Fs) (bool, error)

DirExists checks if a path exists and is a directory.

func Emoji added in v0.54.0

func Emoji(key string) []byte

Emoji returns the emojy given a key, e.g. ":smile:", nil if not found.

func Emojify

func Emojify(source []byte) []byte

Emojify "emojifies" the input source. Note that the input byte slice will be modified if needed. See

func Exists

func Exists(path string, fs afero.Fs) (bool, error)

Exists checks if a file or directory exists.

func Ext added in v0.24.1

func Ext(in string) string

Ext takes a path and returns the extension, including the delmiter, i.e. ".md".

func ExtNoDelimiter added in v0.45.1

func ExtNoDelimiter(in string) string

ExtNoDelimiter takes a path and returns the extension, excluding the delmiter, i.e. "md".

func ExtractRootPaths

func ExtractRootPaths(paths []string) []string

ExtractRootPaths extracts the root paths from the supplied list of paths. The resulting root path will not contain any file separators, but there may be duplicates. So "/content/section/" becomes "content"

func ExtractTOC

func ExtractTOC(content []byte) (newcontent []byte, toc []byte)

ExtractTOC extracts Table of Contents from content.

func FileAndExt added in v0.32.1

func FileAndExt(in string) (string, string)

FileAndExt takes a path and returns the file and extension separated, the extension including the delmiter, i.e. ".md".

func FileAndExtNoDelimiter added in v0.54.0

func FileAndExtNoDelimiter(in string) (string, string)

FileAndExtNoDelimiter takes a path and returns the file and extension separated, the extension excluding the delmiter, e.g "md".

func FileContains

func FileContains(filename string, subslice []byte, fs afero.Fs) (bool, error)

FileContains checks if a file contains a specified string.

func FileContainsAny

func FileContainsAny(filename string, subslices [][]byte, fs afero.Fs) (bool, error)

FileContainsAny checks if a file contains any of the specified strings.

func Filename

func Filename(in string) (name string)

Filename takes a path, strips out the extension, and returns the name of the file.

func FindAvailablePort

func FindAvailablePort() (*net.TCPAddr, error)

FindAvailablePort returns an available and valid TCP port.

func FindCWD

func FindCWD() (string, error)

FindCWD returns the current working directory from where the Hugo executable is run.

func FirstUpper

func FirstUpper(s string) string

FirstUpper returns a string with the first character as upper case.

func GetCacheDir added in v0.54.0

func GetCacheDir(fs afero.Fs, cfg config.Provider) (string, error)

GetCacheDir returns a cache dir from the given filesystem and config. The dir will be created if it does not exist.

func GetDottedRelativePath

func GetDottedRelativePath(inPath string) string

GetDottedRelativePath expects a relative path starting after the content directory. It returns a relative path with dots ("..") navigating up the path structure.

func GetRelativePath

func GetRelativePath(path, base string) (final string, err error)

GetRelativePath returns the relative path of a given path.

func GetTempDir

func GetTempDir(subPath string, fs afero.Fs) string

GetTempDir returns a temporary directory with the given sub path.

func GetTitleFunc added in v0.27.1

func GetTitleFunc(style string) func(s string) string

GetTitleFunc returns a func that can be used to transform a string to title case.

The supported styles are

- "Go" (strings.Title) - "AP" (see - "Chicago" (see

If an unknown or empty style is provided, AP style is what you get.

func GuessType

func GuessType(in string) string

GuessType attempts to guess the type of file from a given string.

func HasAsciidoc

func HasAsciidoc() bool

HasAsciidoc returns whether Asciidoc or Asciidoctor is installed on this computer.

func HasRst

func HasRst() bool

HasRst returns whether rst2html is installed on this computer.

func HasStringsPrefix added in v0.25.1

func HasStringsPrefix(s, prefix []string) bool

HasStringsPrefix tests whether the string slice s begins with prefix slice s.

func HasStringsSuffix added in v0.25.1

func HasStringsSuffix(s, suffix []string) bool

HasStringsSuffix tests whether the string slice s ends with suffix slice s.

func InStringArray

func InStringArray(arr []string, el string) bool

InStringArray checks if a string is an element of a slice of strings and returns a boolean value.

func InitLoggers

func InitLoggers()

InitLoggers sets up the global distinct loggers.

func IsAbsURL

func IsAbsURL(path string) bool

IsAbsURL determines whether the given path points to an absolute URL.

func IsDir

func IsDir(path string, fs afero.Fs) (bool, error)

IsDir checks if a given path is a directory.

func IsEmpty

func IsEmpty(path string, fs afero.Fs) (bool, error)

IsEmpty checks if a given path is empty.

func IsWhitespace

func IsWhitespace(r rune) bool

IsWhitespace determines if the given rune is whitespace.

func LstatIfPossible added in v0.38.1

func LstatIfPossible(fs afero.Fs, path string) (os.FileInfo, error)

LstatIfPossible can be used to call Lstat if possible, else Stat.

func MD5FromFileFast added in v0.32.1

func MD5FromFileFast(r io.ReadSeeker) (string, error)

MD5FromFileFast creates a MD5 hash from the given file. It only reads parts of the file for speed, so don't use it if the files are very subtly different. It will not close the file.

func MD5FromReader added in v0.54.0

func MD5FromReader(r io.Reader) (string, error)

MD5FromReader creates a MD5 hash from the given reader.

func MD5String added in v0.32.1

func MD5String(f string) string

MD5String takes a string and returns its MD5 hash.

func MakePermalink(host, plink string) *url.URL

MakePermalink combines base URL with content path to create full URL paths. Example

path:   post/how-i-blog

func MakeTitle

func MakeTitle(inpath string) string

MakeTitle converts the path given to a suitable title, trimming whitespace and replacing hyphens with whitespace.

func NormalizeHugoFlags

func NormalizeHugoFlags(f *pflag.FlagSet, name string) pflag.NormalizedName

NormalizeHugoFlags facilitates transitions of Hugo command-line flags, e.g. --baseUrl to --baseURL, --uglyUrls to --uglyURLs

func OpenFileForWriting added in v0.47.1

func OpenFileForWriting(fs afero.Fs, filename string) (afero.File, error)

OpenFileForWriting opens or creates the given file. If the target directory does not exist, it gets created.

func OpenFilesForWriting added in v0.47.1

func OpenFilesForWriting(fs afero.Fs, filenames ...string) (io.WriteCloser, error)

OpenFilesForWriting opens all the given filenames for writing.

func PathAndExt added in v0.45.1

func PathAndExt(in string) (string, string)

PathAndExt is the same as FileAndExt, but it uses the path package.

func PathPrep

func PathPrep(ugly bool, in string) string

PathPrep prepares the path using the uglify setting to create paths on either the form /section/name/index.html or /section/name.html.

func PrettifyPath

func PrettifyPath(in string) string

PrettifyPath is the same as PrettifyURLPath but for file paths.

/section/name.html       becomes /section/name/index.html
/section/name/           becomes /section/name/index.html
/section/name/index.html becomes /section/name/index.html

func PrettifyURL

func PrettifyURL(in string) string

PrettifyURL takes a URL string and returns a semantic, clean URL.

func PrettifyURLPath

func PrettifyURLPath(in string) string

PrettifyURLPath takes a URL path to a content and converts it to enable pretty URLs.

/section/name.html       becomes /section/name/index.html
/section/name/           becomes /section/name/index.html
/section/name/index.html becomes /section/name/index.html

func PrintFs added in v0.42.1

func PrintFs(fs afero.Fs, path string, w io.Writer)

PrintFs prints the given filesystem to the given writer starting from the given path. This is useful for debugging.

func ProcessingStatsTable added in v0.32.1

func ProcessingStatsTable(w io.Writer, stats ...*ProcessingStats)

ProcessingStatsTable writes a table-formatted representation of stats to w.

func ReaderContains

func ReaderContains(r io.Reader, subslice []byte) bool

ReaderContains reports whether subslice is within r.

func ReaderToBytes

func ReaderToBytes(lines io.Reader) []byte

ReaderToBytes takes an io.Reader argument, reads from it and returns bytes.

func ReaderToString

func ReaderToString(lines io.Reader) string

ReaderToString is the same as ReaderToBytes, but returns a string.

func ReplaceExtension

func ReplaceExtension(path string, newExt string) string

ReplaceExtension takes a path and an extension, strips the old extension and returns the path with the new extension.

func SafeWriteToDisk

func SafeWriteToDisk(inpath string, r io.Reader, fs afero.Fs) (err error)

SafeWriteToDisk is the same as WriteToDisk but it also checks to see if file/directory already exists.

func SanitizeURL

func SanitizeURL(in string) string

SanitizeURL sanitizes the input URL string.

func SanitizeURLKeepTrailingSlash

func SanitizeURLKeepTrailingSlash(in string) string

SanitizeURLKeepTrailingSlash is the same as SanitizeURL, but will keep any trailing slash.

func SliceToLower

func SliceToLower(s []string) []string

SliceToLower goes through the source slice and lowers all values.

func StripHTML

func StripHTML(s string) string

StripHTML accepts a string, strips out all HTML tags and returns it.

func SymbolicWalk

func SymbolicWalk(fs afero.Fs, root string, walker hugofs.WalkFunc) error

SymbolicWalk is like filepath.Walk, but it follows symbolic links.

func ToSlashTrimLeading added in v0.45.1

func ToSlashTrimLeading(s string) string

ToSlashTrimLeading is just a filepath.ToSlaas with an added / prefix trimmer.

func TotalWords

func TotalWords(s string) int

TotalWords counts instance of one or more consecutive white space characters, as defined by unicode.IsSpace, in s. This is a cheaper way of word counting than the obvious len(strings.Fields(s)).

func Uglify

func Uglify(in string) string

Uglify does the opposite of PrettifyURLPath().

/section/name/index.html becomes /section/name.html
/section/name/           becomes /section/name.html
/section/name.html       becomes /section/name.html

func UniqueStrings

func UniqueStrings(s []string) []string

UniqueStrings returns a new slice with any duplicates removed.

func UniqueStringsReuse added in v0.56.0

func UniqueStringsReuse(s []string) []string

UniqueStringsReuse returns a slice with any duplicates removed. It will modify the input slice.

func UniqueStringsSorted added in v0.56.0

func UniqueStringsSorted(s []string) []string

UniqueStringsReuse returns a sorted slice with any duplicates removed. It will modify the input slice.

func WriteToDisk

func WriteToDisk(inpath string, r io.Reader, fs afero.Fs) (err error)

WriteToDisk writes content to disk.


type BlackFriday added in v0.32.1

type BlackFriday struct {
	Smartypants           bool
	SmartypantsQuotesNBSP bool
	AngledQuotes          bool
	Fractions             bool
	HrefTargetBlank       bool
	NofollowLinks         bool
	NoreferrerLinks       bool
	SmartDashes           bool
	LatexDashes           bool
	TaskLists             bool
	PlainIDAnchors        bool
	Extensions            []string
	ExtensionsMask        []string
	SkipHTML              bool

BlackFriday holds configuration values for BlackFriday rendering.

type ContentSpec added in v0.20.1

type ContentSpec struct {
	BlackFriday *BlackFriday

	BuildFuture  bool
	BuildExpired bool
	BuildDrafts  bool

	Highlight func(code, lang, optsStr string) (string, error)

	Cfg config.Provider
	// contains filtered or unexported fields

ContentSpec provides functionality to render markdown content.

func NewContentSpec added in v0.20.1

func NewContentSpec(cfg config.Provider) (*ContentSpec, error)

NewContentSpec returns a ContentSpec initialized with the appropriate fields from the given config.Provider.

func (ContentSpec) RenderBytes added in v0.20.1

func (c ContentSpec) RenderBytes(ctx *RenderingContext) []byte

RenderBytes renders a []byte.

func (*ContentSpec) TrimShortHTML added in v0.55.0

func (c *ContentSpec) TrimShortHTML(input []byte) []byte

TrimShortHTML removes the <p>/</p> tags from HTML input in the situation where said tags are the only <p> tags in the input and enclose the content of the input (whitespace excluded).

func (*ContentSpec) TruncateWordsByRune added in v0.30.1

func (c *ContentSpec) TruncateWordsByRune(in []string) (string, bool)

TruncateWordsByRune truncates words by runes.

func (*ContentSpec) TruncateWordsToWholeSentence added in v0.30.1

func (c *ContentSpec) TruncateWordsToWholeSentence(s string) (string, bool)

TruncateWordsToWholeSentence takes content and truncates to whole sentence limited by max number of words. It also returns whether it is truncated.

type DistinctLogger

type DistinctLogger struct {
	// contains filtered or unexported fields

DistinctLogger ignores duplicate log statements.

func NewDistinctErrorLogger

func NewDistinctErrorLogger() *DistinctLogger

NewDistinctErrorLogger creates a new DistinctLogger that logs ERRORs

func NewDistinctFeedbackLogger

func NewDistinctFeedbackLogger() *DistinctLogger

NewDistinctFeedbackLogger creates a new DistinctLogger that can be used to give feedback to the user while not spamming with duplicates.

func NewDistinctLogger added in v0.42.1

func NewDistinctLogger(logger LogPrinter) *DistinctLogger

NewDistinctLogger creates a new DistinctLogger that logs to the provided logger.

func NewDistinctWarnLogger added in v0.20.1

func NewDistinctWarnLogger() *DistinctLogger

NewDistinctWarnLogger creates a new DistinctLogger that logs WARNs

func (*DistinctLogger) Printf

func (l *DistinctLogger) Printf(format string, v ...interface{})

Printf will log the string returned from fmt.Sprintf given the arguments, but not if it has been logged before. Note: A newline is appended.

func (*DistinctLogger) Println

func (l *DistinctLogger) Println(v ...interface{})

Println will log the string returned from fmt.Sprintln given the arguments, but not if it has been logged before.

type HugoHTMLRenderer

type HugoHTMLRenderer struct {
	// contains filtered or unexported fields

HugoHTMLRenderer wraps a blackfriday.Renderer, typically a blackfriday.Html Enabling Hugo to customise the rendering experience

func (*HugoHTMLRenderer) BlockCode

func (r *HugoHTMLRenderer) BlockCode(out *bytes.Buffer, text []byte, lang string)

BlockCode renders a given text as a block of code. Pygments is used if it is setup to handle code fences.

func (*HugoHTMLRenderer) List

func (r *HugoHTMLRenderer) List(out *bytes.Buffer, text func() bool, flags int)

List adds task list support to the Blackfriday renderer.

func (*HugoHTMLRenderer) ListItem

func (r *HugoHTMLRenderer) ListItem(out *bytes.Buffer, text []byte, flags int)

ListItem adds task list support to the Blackfriday renderer.

type HugoMmarkHTMLRenderer

type HugoMmarkHTMLRenderer struct {
	Cfg config.Provider
	// contains filtered or unexported fields

HugoMmarkHTMLRenderer wraps a mmark.Renderer, typically a mmark.html, enabling Hugo to customise the rendering experience.

func (*HugoMmarkHTMLRenderer) BlockCode

func (r *HugoMmarkHTMLRenderer) BlockCode(out *bytes.Buffer, text []byte, lang string, caption []byte, subfigure bool, callouts bool)

BlockCode renders a given text as a block of code. Pygments is used if it is setup to handle code fences.

type LogPrinter added in v0.42.1

type LogPrinter interface {
	// Println is the only common method that works in all of JWWs loggers.
	Println(a ...interface{})

LogPrinter is the common interface of the JWWs loggers.

type NamedSlice added in v0.56.0

type NamedSlice struct {
	Name  string
	Slice []string

func ExtractAndGroupRootPaths added in v0.56.0

func ExtractAndGroupRootPaths(paths []string) []NamedSlice

func (NamedSlice) String added in v0.56.0

func (n NamedSlice) String() string

type PathSpec

type PathSpec struct {

	ProcessingStats *ProcessingStats

	// The file systems to use
	Fs *hugofs.Fs

	// The config provider to use
	Cfg config.Provider

PathSpec holds methods that decides how paths in URLs and files in Hugo should look like.

func NewPathSpec added in v0.20.1

func NewPathSpec(fs *hugofs.Fs, cfg config.Provider, logger *loggers.Logger) (*PathSpec, error)

NewPathSpec creats a new PathSpec from the given filesystems and language.

func NewPathSpecWithBaseBaseFsProvided added in v0.42.1

func NewPathSpecWithBaseBaseFsProvided(fs *hugofs.Fs, cfg config.Provider, logger *loggers.Logger, baseBaseFs *filesystems.BaseFs) (*PathSpec, error)

NewPathSpecWithBaseBaseFsProvided creats a new PathSpec from the given filesystems and language. If an existing BaseFs is provided, parts of that is reused.

func (*PathSpec) AbsURL

func (p *PathSpec) AbsURL(in string, addLanguage bool) string

AbsURL creates an absolute URL from the relative path given and the BaseURL set in config.

func (*PathSpec) MakePath

func (p *PathSpec) MakePath(s string) string

MakePath takes a string with any characters and replace it so the string could be used in a path. It does so by creating a Unicode-sanitized string, with the spaces replaced, whilst preserving the original casing of the string. E.g. Social Media -> Social-Media

func (*PathSpec) MakePathSanitized

func (p *PathSpec) MakePathSanitized(s string) string

MakePathSanitized creates a Unicode-sanitized string, with the spaces replaced

func (*PathSpec) MakePathsSanitized added in v0.55.0

func (p *PathSpec) MakePathsSanitized(paths []string)

MakePathsSanitized applies MakePathSanitized on every item in the slice

func (*PathSpec) PermalinkForBaseURL added in v0.32.1

func (p *PathSpec) PermalinkForBaseURL(link, baseURL string) string

PermalinkForBaseURL creates a permalink from the given link and baseURL.

func (*PathSpec) PrependBasePath added in v0.20.1

func (p *PathSpec) PrependBasePath(rel string, isAbs bool) string

PrependBasePath prepends any baseURL sub-folder to the given resource

func (*PathSpec) RelURL

func (p *PathSpec) RelURL(in string, addLanguage bool) string

RelURL creates a URL relative to the BaseURL root. Note: The result URL will not include the context root if canonifyURLs is enabled.

func (*PathSpec) URLEscape added in v0.20.1

func (p *PathSpec) URLEscape(uri string) string

URLEscape escapes unicode letters.

func (*PathSpec) URLPrep

func (p *PathSpec) URLPrep(in string) string

URLPrep applies misc sanitation to the given URL.

func (*PathSpec) URLize

func (p *PathSpec) URLize(uri string) string

URLize is similar to MakePath, but with Unicode handling Example:

uri: Vim (text editor)
urlize: vim-text-editor

func (*PathSpec) URLizeAndPrep

func (p *PathSpec) URLizeAndPrep(in string) string

URLizeAndPrep applies misc sanitation to the given URL to get it in line with the Hugo standard.

func (*PathSpec) URLizeFilename added in v0.20.1

func (p *PathSpec) URLizeFilename(filename string) string

URLizeFilename creates an URL from a filename by esacaping unicode letters and turn any filepath separator into forward slashes.

func (*PathSpec) UnicodeSanitize

func (p *PathSpec) UnicodeSanitize(s string) string

UnicodeSanitize sanitizes string to be used in Hugo URL's, allowing only a predefined set of special Unicode characters. If RemovePathAccents configuration flag is enabled, Uniccode accents are also removed. Spaces will be replaced with a single hyphen, and sequential hyphens will be reduced to one.

type ProcessingStats added in v0.32.1

type ProcessingStats struct {
	Name string

	Pages           uint64
	PaginatorPages  uint64
	Static          uint64
	ProcessedImages uint64
	Files           uint64
	Aliases         uint64
	Sitemaps        uint64
	Cleaned         uint64

ProcessingStats represents statistics about a site build.

func NewProcessingStats added in v0.32.1

func NewProcessingStats(name string) *ProcessingStats

NewProcessingStats returns a new ProcessingStats instance.

func (*ProcessingStats) Add added in v0.32.1

func (s *ProcessingStats) Add(counter *uint64, amount int)

Add adds an amount to a given counter.

func (*ProcessingStats) Incr added in v0.32.1

func (s *ProcessingStats) Incr(counter *uint64)

Incr increments a given counter.

func (*ProcessingStats) Table added in v0.32.1

func (s *ProcessingStats) Table(w io.Writer)

Table writes a table-formatted representation of the stats in a ProcessingStats instance to w.

type RenderingContext

type RenderingContext struct {
	Content      []byte
	PageFmt      string
	DocumentID   string
	DocumentName string
	Config       *BlackFriday
	RenderTOC    bool
	Cfg          config.Provider

RenderingContext holds contextual information, like content and configuration, for a given content rendering. By creating you must set the Config, otherwise it will panic.

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