Code blocks and syntax highlight

[GBrachetta]

I'm not sure this happens only with your template, but the first line of code blocks gets a ½ character indentation, so for this snippet, for example:

```sql
ALTER ROLE <username> SET client_encoding TO 'utf8';
ALTER ROLE <username> SET default_transaction_isolation TO 'read committed';
ALTER ROLE <username> SET timezone TO 'UTC';
``` (need to write this so the code doesn't render in the issue and shows what I use in the md file, please disregard)

I get this result:

You can see that the first line gets a ½ character indentation. Strange!

Also, I don't get any syntax coloring for my code snippets, regardless of the language I pick.

[hikerpig]

Thank you for asking. Yeah I havn't paid attention to syntax highlighting in gatsby-theme-kb very much, people may have different preferences on this and they can always add gatsby remark prism or other plugins.

But I can try to add some examples in this repo though. Might take a few days.

[GBrachetta]

Ah, thank you! I didn't realise I needed a plugin! :)

I tried installing

yarn add gatsby-transformer-remark gatsby-remark-prismjs prismjs

and added this in my gatsby-config.js, under your gatsby-plugin-copy-files-enhanced, as an additional plugin:

    {
      resolve: `gatsby-transformer-remark`,
      options: {
        plugins: [
          {
            resolve: `gatsby-remark-prismjs`,
            options: {
              classPrefix: 'language-',
              inlineCodeMarker: null,
              aliases: {},
              showLineNumbers: true,
              noInlineHighlight: false,
              languageExtensions: [
                {
                  language: 'superscript',
                  extend: 'javascript',
                  definition: {
                    superscript_types: /(SuperType)/,
                  },
                  insertBefore: {
                    function: {
                      superscript_keywords: /(superif|superelse)/,
                    },
                  },
                },
              ],
              prompt: {
                user: 'root',
                host: 'localhost',
                global: false,
              },
              escapeEntities: {},
            },
          },
        ],
      },
    }

I then created a gatsby-browser.js file, with

require('prismjs/themes/prism-dark.css');
require('prismjs/plugins/line-numbers/prism-line-numbers.css');
require('prismjs/plugins/command-line/prism-command-line.css');

So I can have a theme, line numbers and a command-line $ prompt for bash commands, but I have the feeling I'm messing things up because things don't seem to be working fine 😄

(note: I tried to follow this)

[hikerpig]

Oh, the gatsby-theme-kb is using gatsby-plugin-mdx and not the transformer you mentioned.

[GBrachetta]

Oh, I knew I was messing things up!

Whenever you have time to show how to do this properly, I'd be really grateful!

[hikerpig]

Sure, I will try to finish this before next weekend.

[GBrachetta]

I don't know if this is the way to go, but I managed to get syntax highlighting doing this:

yarn add gatsby-remark-prismjs prismjs

In gatsby-config.js, add the following line under resolve: gatsby-remark-copy-linked-files:

resolve: `gatsby-remark-prismjs`,

After the closing curly brace for the copy-files-enhanced plugin, added:

    {
      resolve: `gatsby-remark-prismjs`,
      options: {
        classPrefix: 'language-',
        inlineCodeMarker: null,
        aliases: {},
        showLineNumbers: false,
        noInlineHighlight: false,
        prompt: {
          user: 'root',
          host: 'localhost',
          global: true,
        },
        escapeEntities: {},
      },
    },

Created a file `gatsby-browser.js, and added:

require('prismjs/themes/prism-okaidia.css');
require('prismjs/plugins/command-line/prism-command-line.css');
require('prismjs/plugins/line-numbers/prism-line-numbers.css');
require('./style.css');

created inside _layouts a file style.css, referenced in gatsby-browser.js and added my styles as described here.

I'm not sure if this is the way you would do it, but It seems to be working so far though! 😄 (although I have the feeling my gatsby-config file isn't correct because my options aren't working...)

[hikerpig]

@GBrachetta Actually that what I will do, congrats! As for the options, I don't have a clue yet, though. Will wait for I get started. And I will take your solution as a start, thank you !

[GBrachetta]

Oh that's nice to hear!!

I think the options have to be passed in this function

getPluginMdx(defaultPluginMdx) {
         defaultPluginMdx.options.gatsbyRemarkPlugins.push({
           resolve: `gatsby-remark-copy-linked-files`,
           resolve: `gatsby-remark-prismjs`,
           options: {
             ignoreFileExtensions: ['md', 'mdx'],
           },
         });
         return defaultPluginMdx;
       },

under ignoreFileExtensions, but for some reason when I do so the rendering hangs when I request a note.

I'll wait for your solution 😄

[GBrachetta]

I managed 😄

These are the files, in case you find them useful:

• package.json

{
    "name": "foam-template-gatsby-kb",
    "version": "1.0.0",
    "description": "A foam template using gatsby-theme-kb for publishing you knowledge base",
    "main": "index.js",
    "scripts": {
        "dev": "gatsby develop",
        "build": "gatsby build --prefix-paths",
        "serve": "gatsby serve"
    },
    "keywords": [
        "foam"
    ],
    "author": "chenmin",
    "license": "MIT",
    "dependencies": {
        "gatsby": "^2.31.1",
        "gatsby-plugin-copy-files-enhanced": "^1.1.1",
        "gatsby-remark-copy-linked-files": "^2.10.0",
        "gatsby-remark-prismjs": "^3.13.0",
        "gatsby-theme-kb": "latest",
        "prismjs": "^1.23.0"
    }
}

• gatsby-config.js

const path = require('path');

module.exports = {
  pathPrefix: `/`,
  siteMetadata: {
    title: `Title`,
    author: `Author`,
    description: `Description`,
  },
  plugins: [
    {
      resolve: `gatsby-theme-kb`,
      options: {
        rootNote: '/readme',
        contentPath: `${__dirname}/..`,
        ignore: [
          '**/_layouts/**',
          '**/.git/**',
          '**/.github/**',
          '**/.vscode/**',
          '**/.cache/**',
        ],
        getPluginMdx(defaultPluginMdx) {
          defaultPluginMdx.options.gatsbyRemarkPlugins.push({
            resolve: `gatsby-remark-copy-linked-files`,
            options: {
              ignoreFileExtensions: ['md', 'mdx'],
            },
          });
          defaultPluginMdx.options.gatsbyRemarkPlugins.push({
            resolve: `gatsby-remark-prismjs`,
            options: {
              prompt: {
                user: 'root',
                host: 'localhost',
                global: true,
              },
              inlineCodeMarker: '>',
            },
          });
          return defaultPluginMdx;
        },
      },
    },
    {
      resolve: 'gatsby-plugin-copy-files-enhanced',
      options: {
        source: path.resolve(__dirname, `../assets`),
        destination: '/assets',
        purge: false,
      },
    },
  ],
};

• gatsby-browser.js

require('prismjs/themes/prism-okaidia.css');
require('prismjs/plugins/command-line/prism-command-line.css');
require('prismjs/plugins/line-numbers/prism-line-numbers.css');
require('./style.css'); // optional

• style.css (optional, in case the file is required in gatsby-browser.js. Here's where the user tweaks the styling of the plugin.

/* Styles for line numbering */
.gatsby-highlight pre[class*="language-"].line-numbers {
  padding-left: 2.8em;
}

/* Styles for line highlighting */
.gatsby-highlight-code-line {
  background-color: rgba(30, 66, 87, 0.5);
  display: block;
  margin-right: -1em;
  margin-left: -1em;
  padding-right: 1em;
  padding-left: 0.75em;
  border-left: 0.25em solid rgb(143, 29, 29);
}

/* Styles for bash prompt */
.command-line-prompt > span:before {
  color: #7bbeb9;
  content: " ";
  display: block;
  padding-right: 0.8em;
}

/* Prompt for all users */
.command-line-prompt > span[data-user]:before {
  content: "[" attr(data-user) "@" attr(data-host) "] $";
}

/* Prompt for root */
.command-line-prompt > span[data-user="root"]:before {
  content: "[" attr(data-user) "@" attr(data-host) "] #";
}

.command-line-prompt > span[data-prompt]:before {
  content: attr(data-prompt);
}

/* Styles for code background color */
:not(pre) > code[class*="language-"],
pre[class*="language-"] {
  background-color: #292e3a;
}

Hope you don't mind me sending you these, but perhaps saves you some time!

[orta]

I added shiki and twoslash ( the infra which powers TypeScript's website) in https://github.com/orta/notes - config:

          defaultPluginMdx.options.gatsbyRemarkPlugins.push({
            resolve: "gatsby-remark-shiki-twoslash",
            options: {
              theme: "github-light",
              useNodeModules: true,
              nodeModulesTypesPath: path.join(__dirname, "..", "node_modules"),
            },
          });

CSS

[GBrachetta]

@orta This looks quite nice actually! There's a lot more css involved, but I like the flexibility. I managed to run it, without creating a src folder but just the css file and requiring it in gatsby-browser. Where can I find more information to style it? (Also about line numbers/bash prompts, etc) I also see the language displayed in the top-left corner, and would like to get rid of it:

Thanks for this tip, it looks quite nice.

[orta]

ah yeah, I use Gatsby theme shadowing to inject my CSS: https://github.com/orta/notes/tree/master/_layouts/src/gatsby-theme-kb/components/Topic

[Shiki]|(https://shiki.matsu.io) is pretty sparsely documented, it's on the todo to get some of those kind of features in

[hikerpig]

So glad to see you two get what you wanted and learn something about shiki and twoslash. 🥳 I should put this discussion in the readme for example, and just fix the indentation in gatsby-theme-kb.

[hikerpig]

I've add example configs to default gatsby-config.js, I chose PrismJS over shiki for I want to change some of the syntax styles when switching between dark/light mode, and in my tests shiki produces inline style which is not easy to change, I guess.

[GBrachetta]

Amazing! I'll compare it with what I did and will obviously overwrite my wrongs with your solution! Thank you!

[GBrachetta]

Hi! Just following up on the issue with the offseft first line in codeblocks, I see that when using line numbers the same happens to the vertical alignment, so it is not only horizontally offset half space but as well vertically.

I created a quick screenshot to illustrate it:

I wonder if these two displacements are related?

[hikerpig]

@GBrachetta I will fix this today. 👍

[hikerpig]

@GBrachetta Some quick fixes

/* This rule will fix the horizontal offset, I shall add it to gatsby-theme-kb and publish some days later, but you can add it to your styles for a quickfix */
pre code {
  padding: 0;
}

/*
  This will fix the line number issue,
  you should add this only if you have `showLineNumbers: true` option for gatsby-remark-prismjs
*/
.line-numbers .line-numbers-rows {
  padding-top: 1em;
  padding-bottom: 1em;
}

[GBrachetta]

Yes, wonderful, that sorts it!

I don't show numbers by default (meaning I don't have 'showLineNumbers: true') but only when I pass them with {numberLines: true}.

This looks a lot better now: