Atom instructions
To change your font to Fira Code, open Atom's settings (``), make sure the "Settings" tab is selected, and scroll down to "Editor Settings". In the "Font Family" field, enter Fira Code. If you wish to specify a font weight, remove all spaces from the font name and specify the weight following a hyphen (e.g. `FiraCode-Light`).
To enable ligatures, Menu → Stylesheet...
and add text-rendering to atom-text-editor:
atom-text-editor {
text-rendering: optimizeLegibility;
}
You’ll need Atom 1.1 or newer.
Beware that in some syntaxes selected ligatures might not work. This is usually a syntax parser/tokenization issue (e.g. -> breaks into two symbols by JS/Ruby syntax highlighter). See issues #63 and #69
To turn off ligatures inside of strings and regular expressions you can add this to your stylesheet:
atom-text-editor::shadow .string.quoted,
atom-text-editor::shadow .string.regexp {
-webkit-font-feature-settings: "liga" off, "calt" off;
}
If there is any other place that you find you do not want to see ligatures, place your cursor on the location, hit Ctrl+Alt+Shift+P and add the bottom-most selector listed in the popup notification to the rule above.