Autoindent on Sublime Text

That's quite simple in Sublime. Just Ctrl+Shift+P (or Command+Shift+P on MacOS) to open the tools pallet, type reindent, and pick Indentation: Reindent Lines. It should reindent all the file you are in, just remember to save before running the command, or it may not appear.

Auto-indenting on Sublime Text 3 - "Key Bindings"

Just add this binding to your "Key Bindings - User" file:

Preferences > Key Bindings - users

{"keys": ["alt+shift+f"], "command": "reindent", "args": {"single_line": false}}

And adding this code between the square brackets.

Now you can use Alt + Shift + f as your auto-indent shortcut

You can also use the "reindent" feature through the command palette. Ctrl + Shift + P

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Ressources:

Auto-indenting on Sublime Text 3 by Osvaldo Zonetti

Create a Keybinding by Joe Lloyd