Write and preview your Markdown files like a Boss!

Ruby is shipped with macOS. Current builtin ruby version (macOS Monterey) is 2.6.8. First, install bundler to your user folder;

$ gem install --user-install bundler

# find users path
$ ruby -r rubygems -e 'puts Gem.user_dir' # returns /Users/${USER}/.gem/ruby/2.6.0
$ export PATH="/Users/${USER}/.gem/ruby/2.6.0/bin:${PATH}" # add local user gem bin path to your shell environment

# or find it automatically
$ export PATH="$(ruby -r rubygems -e 'puts Gem.user_dir')/bin:${PATH}"

If you have already installed rbenv or rvm, you’re good to go.

Make sure that TextMate is not running. Add TM_RUBY environment variable to TextMate:

$ defaults write com.macromates.TextMate environmentVariables \
    -array-add "{enabled = 1; value = \"$(command -v ruby)\"; name = \"TM_RUBY\"; }"

Now clone the repo:

$ cd ~/Library/Application\ Support/TextMate/Bundles/
$ git clone https://github.com/vigo/textmate2-gfm-preview.git GFM-Preview.tmbundle
$ cd GFM-Preview.tmbundle/Support/
$ bundle config set --local path 'vendor/bundle'
$ bundle

That’s it! Bundle installed successfully! You can follow updates via git pull time-to-time.

$ cd ~/Library/Application\ Support/TextMate/Bundles/GFM-Preview.tmbundle
$ git pull origin main

You can define;

• TM_GFM_ZOOM_FACTOR: For zooming text.
• TM_MARKDOWN_MATHJAX: For Mathjax support.
• TM_MARKDOWN_MERMAID: For Mermaid support. (new!)
• TM_GFM_FONT: For custom font which is installed to your ~/Fonts
• TM_GFM_LINK_FONT_WEIGHT: Optional font-weight: css directive for a link tags.
• TM_GFM_LINK_TEXT_DECORATION: Optional text-decoration: css directive for a link tags.

variables from TextMate > Preferences > Variables for customizing extra features. Or do it from shell:

# assuming that, `OpenSans` font already installed on your ~/Library/Fonts

defaults write com.macromates.TextMate environmentVariables -array-add \
    '{enabled = 1; value = "100%"; name = "TM_GFM_ZOOM_FACTOR"; }' \
    '{enabled = 1; value = 1; name = "TM_MARKDOWN_MATHJAX"; }' \
    '{enabled = 1; value = 1; name = "TM_MARKDOWN_MERMAID"; }' \
    '{enabled = 1; value = "OpenSans"; name = "TM_GFM_FONT"; }' \
    '{enabled = 1; value = "500"; name = "TM_GFM_LINK_FONT_WEIGHT"; }' \
    '{enabled = 1; value = "underline"; name = "TM_GFM_LINK_TEXT_DECORATION"; }'

Without zoom (default/standard)

With 150% zoom:

You name it! Make it 300% if you like to! Now you can hit ⌃ + ⌥ + ⌘ + p or kntrl + alt + cmd + p

With the power or Redcarpet and Rouge gems, we have some special features in markdown operation!

Add TM_MARKDOWN_MERMAID variable and set it to 1. Example mermaid git graph:

```mermaid
gitGraph
    commit
    commit
    branch develop
    checkout develop
    commit
    commit
    checkout main
    merge develop
    commit
    commit
```

or

```mermaid
sequenceDiagram
    Alice->>John: Hello John, how are you?
    John-->>Alice: Great!
    Alice-)John: See you later!
```

Mermaid related configuration via env-vars:

• TM_MARKDOWN_MERMAID_SHOW_SEQUENCE_NUMBERS: true or false will (dis)allow sequence numbers on screen. (sequenceDiagram). Default value is false

Add TM_MARKDOWN_MATHJAX variable and set it to 1 for mathjax support. (TextMate > Preferences > Variables)

Example:

$ log\_232 = log\_22\^5 = 5 $

You can strikethrough words.

You can ~~strikethrough~~ words.

This is your 2^(nd) attempt.

This is your 2^(nd) attempt.

This is underlined but this is still italic

This is _underlined_ but this is still *italic*

This is ==highlighted== text.

This is ==highlighted==

This is a "quote"

This is a "quote"

Click to jump footnote.¹

```ruby
require 'redcarpet'
markdown = Redcarpet.new("Hello World!")
puts markdown.to_html
```

require 'redcarpet'
markdown = Redcarpet.new("Hello World!")
puts markdown.to_html

| First Header  | Second Header |
| ------------- | ------------- |
| Content Cell  | Content Cell  |
| Content Cell  | Content Cell  |

Output:

| Name          | Description                 |
| ------------- | --------------------------- |
| Help          | ~~Display the~~ help window.|
| Close         | _Closes_ a window           |

Output:

| Left-Aligned  | Center Aligned  | Right Aligned |
| :------------ |:---------------:| -------------:|
| col 3 is      | some wordy text |         $1600 |
| col 2 is      | centered        |           $12 |
| zebra stripes | are neat        |            $1 |

Output:

2022-10-04

• Add Mermaid renderer

2019-10-17

• Add bumpversion support

2018-11-21

• Update: Installation information, removed ruby version dependency

2018-11-02

• Fix latest Safari update Version 12.0.1 (13606.2.104.1.2)
• Version bump: 2.2.2

2018-10-18

• Version bump: 2.2.1
• Installation information update

2017-11-06

• Version bump: 2.2.0
• TM_GFM_LINK_FONT_WEIGHT and TM_GFM_LINK_TEXT_DECORATION environment variables are added.

2017-10-02

• Update: t + ⇥ (3 spaces for nested list)
• Fix: app.js remote image loading issue.

2017-09-29

• Update: table + ⇥
• Fix: README

2017-07-08

• Ruby lib gfm.rb re-written from scratch!
• Fixed: Live Preview!

2017-07-02

• Removed: Pygments
• New syntax highlighter: rouge
• Updated to Ruby 2.4.0
• Added: Front-Matter filter for Preview. Thanks to noniq for Markdown-Front-Matter
• Added: Lots of Markdown Snippets!

2017-01-08

• Fix: live preview.

2017-01-02

• Fix: Broken footnotes due to base href.
• New feature: Custom font-family via TM_GFM_FONT env-var.

2017-01-01

• Support for relative image src: ![alt](picture.png "title") looks for picture.png in current folder.

2016-10-04

• Fix zoom factor for TABLEs
• Automatic refresh for Preview (comes with TextMate version 2.0-beta.12.21) when you save file.

2016-09-14

• Added: Mathjax support.
• Added more redcarpet features: Strikethrough, Superscript, Underline, Highlight, Quote, Footnotes. Please preview this readme file via bundle. GitHub doesn’t support some of the features (highlight, superscript, underline, footnote etc...)

2016-04-25

• Added: TM_GFM_ZOOM_FACTOR for zoom options
• Auto-save! If you open an existing file and hit preview, you don’t need to save!

2016-03-20

• converted TM1 edition of this bundle to TM2
• fixed: You don’t need to save before preview!

PR’s are very welcome!

1. fork (https://github.com/vigo/textmate2-gfm-preview/fork)
2. Create your branch (git checkout -b my-features)
3. commit yours (git commit -am 'added killer features')
4. push your branch (git push origin my-features)
5. Than create a new Pull Request!

• Uğur "vigo" Özyılmazel - Creator, maintainer

This project is licensed under MIT.