Merge-fmt - git mergetool leveraging code formatters

WARNING: This tool is still experimental.

merge-fmt is a small wrapper on top git commands to help resolve conflicts by leveraging code formatters.

merge-fmt currently only knows about the following formatters:

• ocamlformat for OCaml.
• refmt for reason.
• dune for dune.

Note that supporting new code formatters is trivial.

Getting started

There are three ways to use merge-fmt.

Standalone

Just call merge-fmt while there are unresolved conflicts. merge-fmt will try resolve conflicts automatically.

As a Git mergetool

merge-fmt can act as a git mergetool. First configure the current git repository with

merge-fmt setup-mergetool
git config --local mergetool.mergefmt.cmd 'merge-fmt mergetool --base=$BASE --current=$LOCAL --other=$REMOTE -o $MERGED'
git config --local mergetool.mergefmt.trustExitCode true

Then, use git mergetool to resolve conflicts with git mergetool -t mergefmt

As a git merge driver

merge-fmt can act as a git merge driver. Configure the current git repository to use merge-fmt as the default merge driver.

$ merge-fmt setup-merge
git config --local merge.mergefmt.name 'merge-fmt driver'
git config --local merge.mergefmt.driver 'merge-fmt mergetool --base=%O --current=%A --other=%B -o %A --name=%P'
git config --local merge.tool 'mergefmt'
git config --local merge.default 'mergefmt'

Install

$ opam pin add merge-fmt git@github.com:hhugo/merge-fmt.git