Theme Documentation - Basics

Discover what the Hugo - LoveIt theme is all about and the core-concepts behind it.

1 Requirements

Thanks to the simplicity of Hugo, Hugo is the only dependency of this theme.

Just install latest version of Hugo (> 0.62.0) for your OS (Windows, Linux, macOS).

Why not support earlier versions of Hugo?

Since Markdown Render Hooks was introduced in the Hugo Christmas Edition, this theme only supports Hugo versions above 0.62.0.

Hugo extended version is recommended

Since some features of this theme need to processes SCSS to CSS, it is recommended to use Hugo extended version for better experience.

2 Installation

The following steps are here to help you initialize your new website. If you don’t know Hugo at all, we strongly suggest you learn more about it by following this great documentation for beginners.

2.1 Create Your Project

Hugo provides a new command to create a new website:

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hugo new site my_website
cd my_website

2.2 Install the Theme

The LoveIt theme’s repository is: https://github.com/dillonzq/LoveIt.

You can download the latest release .zip file of the theme and extract it in the themes directory.

Alternatively, clone this repository to the themes directory:

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git clone https://github.com/dillonzq/LoveIt.git themes/LoveIt

Or, create an empty git repository and make this repository a submodule of your site directory:

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git init
git submodule add https://github.com/dillonzq/LoveIt.git themes/LoveIt

2.3 Basic Configuration

The following is a basic configuration for the LoveIt theme:

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baseURL = "http://example.org/"

# Change the default theme to be use when building the site with Hugo
theme = "LoveIt"

# website title
title = "My New Hugo Site"

# language code ["en", "zh-CN", "fr", "pl", ...]
languageCode = "en"
# language name ["English", "简体中文", "Français", "Polski", ...]
languageName = "English"

# Author config
[author]
  name = "xxxx"
  email = ""
  link = ""

# Menu config
[menu]
  [[menu.main]]
    weight = 1
    identifier = "posts"
    # you can add extra information before the name (HTML format is supported), such as icons
    pre = ""
    # you can add extra information after the name (HTML format is supported), such as icons
    post = ""
    name = "Posts"
    url = "/posts/"
    # title will be shown when you hover on this menu link
    title = ""
  [[menu.main]]
    weight = 2
    identifier = "tags"
    pre = ""
    post = ""
    name = "Tags"
    url = "/tags/"
    title = ""
  [[menu.main]]
    weight = 3
    identifier = "categories"
    pre = ""
    post = ""
    name = "Categories"
    url = "/categories/"
    title = ""

# Markup related configuration in Hugo
[markup]
  # Syntax Highlighting (https://gohugo.io/content-management/syntax-highlighting)
  [markup.highlight]
    # false is a necessary configuration (https://github.com/dillonzq/LoveIt/issues/158)
    noClasses = false

Note

When building the website, you can set a theme by using --theme option. However, we suggest you modify the configuration file (config.toml) and set the theme as the default.

2.4 Create Your First Post

Here is the way to create your first post:

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hugo new posts/first_post.md

Feel free to edit the post file by adding some sample content and replacing the title value in the beginning of the file.

Note

By default all posts and pages are created as a draft. If you want to render these pages, remove the property draft: true from the metadata, set the property draft: false or add -D/--buildDrafts parameter to hugo command.

2.5 Launching the Website Locally

Launch by using the following command:

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hugo serve

Go to http://localhost:1313.

/docs/theme-documentation-basics/basic-configuration-preview.png — Basic configuration preview

Tip

When you run hugo serve, when the contents of the files change, the page automatically refreshes with the changes.

Note

Since the theme use .Scratch in Hugo to implement some features, it is highly recommended that you add --disableFastRender parameter to hugo server command for the live preview of the page you are editing.

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hugo serve --disableFastRender

2.6 Build the Website

When your site is ready to deploy, run the following command:

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hugo

A public folder will be generated, containing all static content and assets for your website. It can now be deployed on any web server.

Tip

The website can be automatically published and hosted with Netlify (Read more about Automated HUGO deployments with Netlify). Alternatively, you can use AWS Amplify, Github pages, Render and more…

3 Configuration

3.1 Site Configuration

In addition to Hugo global configuration and menu configuration, LoveIt lets you define the following parameters in your site configuration (here is a config.toml, whose values are default).

Please open the code block below to view the complete sample configuration :

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[params]
  # site default theme ["auto", "light", "dark"]
  defaultTheme = "auto"
  # public git repo url only then enableGitInfo is true
  gitRepo = ""
  #  which hash function used for SRI, when empty, no SRI is used
  # ["sha256", "sha384", "sha512", "md5"]
  fingerprint = ""
  #  date format
  dateFormat = "2006-01-02"
  # website title for Open Graph and Twitter Cards
  title = "My cool site"
  # website description for RSS, SEO, Open Graph and Twitter Cards
  description = "This is my cool site"
  # website images for Open Graph and Twitter Cards
  images = ["/logo.png"]

  # Header config
  [params.header]
    # desktop header mode ["fixed", "normal", "auto"]
    desktopMode = "fixed"
    # mobile header mode ["fixed", "normal", "auto"]
    mobileMode = "auto"
    #  Header title config
    [params.header.title]
      # URL of the LOGO
      logo = ""
      # title name
      name = ""
      # you can add extra information before the name (HTML format is supported), such as icons
      pre = ""
      # you can add extra information after the name (HTML format is supported), such as icons
      post = ""
      #  whether to use typeit animation for title name
      typeit = false

  # Footer config
  [params.footer]
    enable = true
    #  Custom content (HTML format is supported)
    custom = ''
    #  whether to show Hugo and theme info
    hugo = true
    #  whether to show copyright info
    copyright = true
    #  whether to show the author
    author = true
    # Site creation time
    since = 2019
    # ICP info only in China (HTML format is supported)
    icp = ""
    # license info (HTML format is supported)
    license = '<a rel="license external nofollow noopener noreffer" href="https://creativecommons.org/licenses/by-nc/4.0/" target="_blank">CC BY-NC 4.0</a>'

  #  Section (all posts) page config
  [params.section]
    # special amount of posts in each section page
    paginate = 20
    # date format (month and day)
    dateFormat = "01-02"
    # amount of RSS pages
    rss = 10

  #  List (category or tag) page config
  [params.list]
    # special amount of posts in each list page
    paginate = 20
    # date format (month and day)
    dateFormat = "01-02"
    # amount of RSS pages
    rss = 10

  #  App icon config
  [params.app]
    # optional site title override for the app when added to an iOS home screen or Android launcher
    title = "My cool site"
    # whether to omit favicon resource links
    noFavicon = false
    # modern SVG favicon to use in place of older style .png and .ico files
    svgFavicon = ""
    # Android browser theme color
    themeColor = "#ffffff"
    # Safari mask icon color
    iconColor = "#5bbad5"
    # Windows v8-10 tile color
    tileColor = "#da532c"

  #  Search config
  [params.search]
    enable = true
    # type of search engine ["lunr", "algolia"]
    type = "lunr"
    # max index length of the chunked content
    contentLength = 4000
    # placeholder of the search bar
    placeholder = ""
    #  max number of results length
    maxResultLength = 10
    #  snippet length of the result
    snippetLength = 30
    #  HTML tag name of the highlight part in results
    highlightTag = "em"
    #  whether to use the absolute URL based on the baseURL in search index
    absoluteURL = false
    [params.search.algolia]
      index = ""
      appID = ""
      searchKey = ""

  # Home page config
  [params.home]
    #  amount of RSS pages
    rss = 10
    # Home page profile
    [params.home.profile]
      enable = true
      # Gravatar Email for preferred avatar in home page
      gravatarEmail = ""
      # URL of avatar shown in home page
      avatarURL = "/images/avatar.png"
      #  title shown in home page (HTML format is supported)
      title = ""
      # subtitle shown in home page
      subtitle = "This is My New Hugo Site"
      # whether to use typeit animation for subtitle
      typeit = true
      # whether to show social links
      social = true
      #  disclaimer (HTML format is supported)
      disclaimer = ""
    # Home page posts
    [params.home.posts]
      enable = true
      # special amount of posts in each home posts page
      paginate = 6
      #  replaced with hiddenFromHomePage in params.page
      # default behavior when you don't set "hiddenFromHomePage" in front matter
      defaultHiddenFromHomePage = false

  # Social config about the author
  [params.social]
    GitHub = "xxxx"
    Linkedin = ""
    Twitter = "xxxx"
    Instagram = "xxxx"
    Facebook = "xxxx"
    Telegram = "xxxx"
    Medium = ""
    Gitlab = ""
    Youtubelegacy = ""
    Youtubecustom = ""
    Youtubechannel = ""
    Tumblr = ""
    Quora = ""
    Keybase = ""
    Pinterest = ""
    Reddit = ""
    Codepen = ""
    FreeCodeCamp = ""
    Bitbucket = ""
    Stackoverflow = ""
    Weibo = ""
    Odnoklassniki = ""
    VK = ""
    Flickr = ""
    Xing = ""
    Snapchat = ""
    Soundcloud = ""
    Spotify = ""
    Bandcamp = ""
    Paypal = ""
    Fivehundredpx = ""
    Mix = ""
    Goodreads = ""
    Lastfm = ""
    Foursquare = ""
    Hackernews = ""
    Kickstarter = ""
    Patreon = ""
    Steam = ""
    Twitch = ""
    Strava = ""
    Skype = ""
    Whatsapp = ""
    Zhihu = ""
    Douban = ""
    Angellist = ""
    Slidershare = ""
    Jsfiddle = ""
    Deviantart = ""
    Behance = ""
    Dribbble = ""
    Wordpress = ""
    Vine = ""
    Googlescholar = ""
    Researchgate = ""
    Mastodon = ""
    Thingiverse = ""
    Devto = ""
    Gitea = ""
    XMPP = ""
    Matrix = ""
    Bilibili = ""
    Email = "xxxx@xxxx.com"
    RSS = true # 

  #  Page global config
  [params.page]
    #  whether to hide a page from home page
    hiddenFromHomePage = false
    #  whether to hide a page from search results
    hiddenFromSearch = false
    #  whether to enable twemoji
    twemoji = false
    # whether to enable lightgallery
    lightgallery = false
    #  whether to enable the ruby extended syntax
    ruby = true
    #  whether to enable the fraction extended syntax
    fraction = true
    #  whether to enable the fontawesome extended syntax
    fontawesome = true
    # whether to show link to Raw Markdown content of the content
    linkToMarkdown = true
    #  whether to show the full text content in RSS
    rssFullText = false
    #  Table of the contents config
    [params.page.toc]
      # whether to enable the table of the contents
      enable = true
      #  whether to keep the static table of the contents in front of the post
      keepStatic = true
      # whether to make the table of the contents in the sidebar automatically collapsed
      auto = true
    #  KaTeX mathematical formulas
    [params.page.math]
      enable = true
      #  default inline delimiter is $ ... $ and \( ... \)
      inlineLeftDelimiter = ""
      inlineRightDelimiter = ""
      #  default block delimiter is $$ ... $$, \[ ... \], \begin{equation} ... \end{equation} and some other functions
      blockLeftDelimiter = ""
      blockRightDelimiter = ""
      # KaTeX extension copy_tex
      copyTex = true
      # KaTeX extension mhchem
      mhchem = true
    #  Code config
    [params.page.code]
      # whether to show the copy button of the code block
      copy = true
      # the maximum number of lines of displayed code by default
      maxShownLines = 50
    #  Mapbox GL JS config
    [params.page.mapbox]
      # access token of Mapbox GL JS
      accessToken = ""
      # style for the light theme
      lightStyle = "mapbox://styles/mapbox/light-v10?optimize=true"
      # style for the dark theme
      darkStyle = "mapbox://styles/mapbox/dark-v10?optimize=true"
      # whether to add NavigationControl
      navigation = true
      # whether to add GeolocateControl
      geolocate = true
      # whether to add ScaleControl
      scale = true
      # whether to add FullscreenControl
      fullscreen = true
    #  social share links in post page
    [params.page.share]
      enable = true
      Twitter = true
      Facebook = true
      Linkedin = false
      Whatsapp = false
      Pinterest = false
      Tumblr = false
      HackerNews = true
      Reddit = false
      VK = false
      Buffer = false
      Xing = false
      Line = true
      Instapaper = false
      Pocket = false
      Flipboard = false
      Weibo = true
      Blogger = false
      Baidu = false
      Odnoklassniki = false
      Evernote = false
      Skype = false
      Trello = false
      Mix = false
    #  Comment config
    [params.page.comment]
      enable = false
      # Disqus comment config
      [params.page.comment.disqus]
        # 
        enable = false
        # Disqus shortname to use Disqus in posts
        shortname = ""
      # Gitalk comment config
      [params.page.comment.gitalk]
        # 
        enable = false
        owner = ""
        repo = ""
        clientId = ""
        clientSecret = ""
      # Valine comment config
      [params.page.comment.valine]
        enable = false
        appId = ""
        appKey = ""
        placeholder = ""
        avatar = "mp"
        meta= ""
        pageSize = 10
        lang = ""
        visitor = true
        recordIP = true
        highlight = true
        enableQQ = false
        serverURLs = ""
        #  emoji data file name, default is "google.yml"
        # ["apple.yml", "google.yml", "facebook.yml", "twitter.yml"]
        # located in "themes/LoveIt/assets/data/emoji/" directory
        # you can store your own data files in the same path under your project:
        # "assets/data/emoji/"
        emoji = ""
      # Facebook comment config
      [params.page.comment.facebook]
        enable = false
        width = "100%"
        numPosts = 10
        appId = ""
        languageCode = ""
      #  Telegram comments config
      [params.page.comment.telegram]
        enable = false
        siteID = ""
        limit = 5
        height = ""
        color = ""
        colorful = true
        dislikes = false
        outlined = false
      #  Commento comment config
      [params.page.comment.commento]
        enable = false
      #  Utterances comment config
      [params.page.comment.utterances]
        enable = false
        # owner/repo
        repo = ""
        issueTerm = "pathname"
        label = ""
        lightTheme = "github-light"
        darkTheme = "github-dark"
    #  Third-party library config
    [params.page.library]
      [params.page.library.css]
        # someCSS = "some.css"
        # located in "assets/"
        # Or
        # someCSS = "https://cdn.example.com/some.css"
      [params.page.library.js]
        # someJavascript = "some.js"
        # located in "assets/"
        # Or
        # someJavascript = "https://cdn.example.com/some.js"
    #  Page SEO config
    [params.page.seo]
      # image URL
      images = []
      # Publisher info
      [params.page.seo.publisher]
        name = ""
        logoUrl = ""

  #  TypeIt config
  [params.typeit]
    # typing speed between each step (measured in milliseconds)
    speed = 100
    # blinking speed of the cursor (measured in milliseconds)
    cursorSpeed = 1000
    # character used for the cursor (HTML format is supported)
    cursorChar = "|"
    # cursor duration after typing finishing (measured in milliseconds, "-1" means unlimited)
    duration = -1

  # Site verification code config for Google/Bing/Yandex/Pinterest/Baidu
  [params.verification]
    google = ""
    bing = ""
    yandex = ""
    pinterest = ""
    baidu = ""

  #  Site SEO config
  [params.seo]
    # image URL
    image = ""
    # thumbnail URL
    thumbnailUrl = ""

  #  Analytics config
  [params.analytics]
    enable = false
    # Google Analytics
    [params.analytics.google]
      id = ""
      # whether to anonymize IP
      anonymizeIP = true
    # Fathom Analytics
    [params.analytics.fathom]
      id = ""
      # server url for your tracker if you're self hosting
      server = ""

  #  Cookie consent config
  [params.cookieconsent]
    enable = true
    # text strings used for Cookie consent banner
    [params.cookieconsent.content]
      message = ""
      dismiss = ""
      link = ""

  #  CDN config for third-party library files
  [params.cdn]
    # CDN data file name, disabled by default
    # ["jsdelivr.yml"]
    # located in "themes/LoveIt/assets/data/cdn/" directory
    # you can store your own data files in the same path under your project:
    # "assets/data/cdn/"
    data = ""

  #  Compatibility config
  [params.compatibility]
    # whether to use Polyfill.io to be compatible with older browsers
    polyfill = false
    # whether to use object-fit-images to be compatible with older browsers
    objectFit = false

# Markup related config in Hugo
[markup]
  # Syntax Highlighting
  [markup.highlight]
    codeFences = true
    guessSyntax = true
    lineNos = true
    lineNumbersInTable = true
    # false is a necessary configuration
    # (https://github.com/dillonzq/LoveIt/issues/158)
    noClasses = false
  # Goldmark is from Hugo 0.60 the default library used for Markdown
  [markup.goldmark]
    [markup.goldmark.extensions]
      definitionList = true
      footnote = true
      linkify = true
      strikethrough = true
      table = true
      taskList = true
      typographer = true
    [markup.goldmark.renderer]
      # whether to use HTML tags directly in the document
      unsafe = true
  # Table Of Contents settings
  [markup.tableOfContents]
    startLevel = 2
    endLevel = 6

# Sitemap config
[sitemap]
  changefreq = "weekly"
  filename = "sitemap.xml"
  priority = 0.5

# Permalinks config
[Permalinks]
  # posts = ":year/:month/:filename"
  posts = ":filename"

# Privacy config
[privacy]
  #  privacy of the Google Analytics (replaced by params.analytics.google)
  [privacy.googleAnalytics]
    # ...
  [privacy.twitter]
    enableDNT = true
  [privacy.youtube]
    privacyEnhanced = true

# Options to make output .md files
[mediaTypes]
  [mediaTypes."text/plain"]
    suffixes = ["md"]

# Options to make output .md files
[outputFormats.MarkDown]
  mediaType = "text/plain"
  isPlainText = true
  isHTML = false

# Options to make hugo output files
[outputs]
  # 
  home = ["HTML", "RSS", "JSON"]
  page = ["HTML", "MarkDown"]
  section = ["HTML", "RSS"]
  taxonomy = ["HTML", "RSS"]
  taxonomyTerm = ["HTML"]

Note

Note that some of these parameters are explained in details in other sections of this documentation.

Hugo environments

Default environments are development with hugo serve and production with hugo.

Due to limitations in the local development environment, the comment system, CDN and fingerprint will not be enabled in the development environment.

You could enable these features with hugo serve -e production.

Tips about CDN Configuration

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[params.cdn]
  # CDN data file name, disabled by default
  # ["jsdelivr.yml"]
  data = ""

The default CDN data file is located in themes/LoveIt/assets/data/cdn/ directory. You can store your own data file in the same path under your project: assets/data/cdn/.

Tips about social Configuration

You can directly set your ID to get a default social link and its icon:

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[params.social]
  Mastodon = "@xxxx"

The social link generated is https://mastodon.technology/@xxxx.

Or You can set more options through a dict:

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[params.social]
  [params.social.Mastodon]
    # weight when arranging icons (the greater the weight, the later the icon is positioned)
    weight = 0
    # your social ID
    id = "@xxxx"
    # prefix of your social link
    prefix = "https://mastodon.social/"
    # content hovering on the icon
    title = "Mastodon"

The default data of all supported social links is located in themes/LoveIt/assets/data/social.yaml, which is you can refer to.

/docs/theme-documentation-basics/complete-configuration-preview.png — Complete configuration preview

3.2 Favicons, Browserconfig, Manifest

It is recommended to put your own favicons:

apple-touch-icon.png (180x180)
favicon-32x32.png (32x32)
favicon-16x16.png (16x16)
mstile-150x150.png (150x150)
android-chrome-192x192.png (192x192)
android-chrome-512x512.png (512x512)

into /static. They’re easily created via https://realfavicongenerator.net/.

Customize browserconfig.xml and site.webmanifest to set theme-color and background-color.

3.3 Style Customization

Note

Hugo extended version is necessary for the style customization.

LoveIt theme has been built to be as configurable as possible by defining custom .scss style files.

The directory including the custom .scss style files is assets/css relative to your project root directory.

In assets/css/_override.scss, you can override the variables in themes/LoveIt/assets/css/_variables.scss to customize the style.

Here is a example:

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@import url('https://fonts.googleapis.com/css?family=Fira+Mono:400,700&display=swap&subset=latin-ext');
$code-font-family: Fira Mono, Source Code Pro, Menlo, Consolas, Monaco, monospace;

In assets/css/_custom.scss, you can add some css style code to customize the style.

4 Multilingual and i18n

LoveIt theme is fully compatible with Hugo multilingual mode, which provides in-browser language switching.

/docs/theme-documentation-basics/language-switch.gif — Language Switch

4.1 Compatibility

Language	Hugo Code	HTML `lang` Attribute
English	`en`	`en`
Simplified Chinese	`zh-cn`	`zh-CN`
Traditional Chinese	`zh-tw`	`zh-TW`
French	`fr`	`fr`
Polish	`pl`	`pl`
Brazilian Portuguese	`pt-br`	`pt-BR`
Italian	`it`	`it`
Spanish	`es`	`es`
German	`de`	`de`
German	`de`	`de`
Serbian	`sr`	`sr`
Russian	`ru`	`ru`
Romanian	`ro`	`ro`
Vietnamese	`vi`	`vi`

4.2 Basic Configuration

After learning how Hugo handle multilingual websites, define your languages in your site configuration.

For example with English, Chinese and French website:

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# determines default content language ["en", "zh-cn", "fr", "pl", ...]
defaultContentLanguage = "en"

[languages]
  [languages.en]
    weight = 1
    title = "My New Hugo Site"
    languageCode = "en"
    languageName = "English"
    [[languages.en.menu.main]]
      weight = 1
      identifier = "posts"
      pre = ""
      post = ""
      name = "Posts"
      url = "/posts/"
      title = ""
    [[languages.en.menu.main]]
      weight = 2
      identifier = "tags"
      pre = ""
      post = ""
      name = "Tags"
      url = "/tags/"
      title = ""
    [[languages.en.menu.main]]
      weight = 3
      identifier = "categories"
      pre = ""
      post = ""
      name = "Categories"
      url = "/categories/"
      title = ""

  [languages.zh-cn]
    weight = 2
    title = "我的全新 Hugo 网站"
    languageCode = "zh-CN"
    languageName = "简体中文"
    hasCJKLanguage = true
    [[languages.zh-cn.menu.main]]
      weight = 1
      identifier = "posts"
      pre = ""
      post = ""
      name = "文章"
      url = "/posts/"
      title = ""
    [[languages.zh-cn.menu.main]]
      weight = 2
      identifier = "tags"
      pre = ""
      post = ""
      name = "标签"
      url = "/tags/"
      title = ""
    [[languages.zh-cn.menu.main]]
      weight = 3
      identifier = "categories"
      pre = ""
      post = ""
      name = "分类"
      url = "/categories/"
      title = ""

  [languages.fr]
    weight = 3
    title = "Mon nouveau site Hugo"
    languageCode = "fr"
    languageName = "Français"
    [[languages.fr.menu.main]]
      weight = 1
      identifier = "posts"
      pre = ""
      post = ""
      name = "Postes"
      url = "/posts/"
      title = ""
    [[languages.fr.menu.main]]
      weight = 2
      identifier = "tags"
      pre = ""
      post = ""
      name = "Balises"
      url = "/tags/"
      title = ""
    [[languages.fr.menu.main]]
      weight = 3
      identifier = "categories"
      name = "Catégories"
      pre = ""
      post = ""
      url = "/categories/"
      title = ""

Then, for each new page, append the language code to the file name.

Single file my-page.md is split in three files:

in English: my-page.en.md
in Chinese: my-page.zh-cn.md
in French: my-page.fr.md

Note

Be aware that only translated pages are displayed in menu. It’s not replaced with default language content.

Tip

Use Front Matter parameter to translate urls too.

4.3 Overwrite Translation Strings

Translations strings are used for common default values used in the theme. Translations are available in some languages, but you may use another language or want to override default values.

To override these values, create a new file in your local i18n folder i18n/<languageCode>.toml and inspire yourself from themes/LoveIt/i18n/en.toml.

By the way, as these translations could be used by other people, please take the time to propose a translation by making a PR to the theme!

5 Search

Based on Lunr.js or algolia, searching is supported in LoveIt theme.

5.1 Output Configuration

In order to generate index.json for searching, add JSON output file type to the home of the outputs part in your site configuration.

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[outputs]
  home = ["HTML", "RSS", "JSON"]

5.2 Search Configuration

Based on index.json generated by Hugo, you could activate searching.

Here is the search configuration in your site configuration:

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[params.search]
  enable = true
  # type of search engine ["lunr", "algolia"]
  type = "lunr"
  # max index length of the chunked content
  contentLength = 4000
  # placeholder of the search bar
  placeholder = ""
  #  max number of results length
  maxResultLength = 10
  #  snippet length of the result
  snippetLength = 30
  #  HTML tag name of the highlight part in results
  highlightTag = "em"
  #  whether to use the absolute URL based on the baseURL in search index
  absoluteURL = false
  [params.search.algolia]
    index = ""
    appID = ""
    searchKey = ""

How to choose search engine?

The following is a comparison of two search engines:

lunr: simple, no need to synchronize index.json, no limit for contentLength, but high bandwidth and low performance (Especially for Chinese which needs a large segmentit library)
algolia: high performance and low bandwidth, but need to synchronize index.json and limit for contentLength

The content of the post is separated by h2 and h3 HTML tag to improve query performance and basically implement full-text search. contentLength is used to limit the max index length of the part starting with h2 and h3 HTML tag.

Tips about algolia

You need to upload index.json files to algolia to activate searching. You could upload the index.json files by browsers but a CLI tool may be better. The official Algolia CLI is a good choice. To be compatible with Hugo multilingual mode, you need to upload different index.json for each language to the different index of algolia, such as zh-cn/index.json or fr/index.json…