Integrate with Fork
Make JuxtaCode the external diff and merge tool for Fork.
Required setup
Install the juxta command
Choose the instructions for your version of JuxtaCode.
Direct version
In JuxtaCode, choose JuxtaCode → Command Line Tool…, then select Install….
App Store version
Download the juxta installer and run the package.
In Fork, go to Settings → Integration and set both Merge Tool and External Diff Tool to Custom.

For each setting, select Edit… and enter the following values.
Merge tool
- File path:
/usr/local/bin/juxta - Arguments:
_mergetool --base $BASE --local $LOCAL --remote $REMOTE --merged $MERGED
External diff tool
- File path:
/usr/local/bin/juxta - Arguments:
compare $LOCAL $REMOTE