fmdiff ☆

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Description:
Use FileMerge as a diff command for Subversion and Mercurial

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: diff merge subversion mercurial macos developer-tools

Install: brew install fmdiff

About:
Fmdiff is a command-line wrapper that integrates FileMerge (opendiff) into version control workflows. It enables developers to use Apple's graphical diff and merge tool directly with Subversion and Mercurial repositories. This provides a more visual and interactive alternative to standard text-based diff tools for resolving code conflicts.

Key Features:

Seamless integration with Subversion and Mercurial
Leverages the native macOS FileMerge application
Simplifies complex merge conflict resolution
Acts as a drop-in replacement for standard diff commands

Use Cases:

Resolving complex merge conflicts in SVN or Mercurial with a visual tool
Comparing file versions graphically from the command line
For developers who prefer the FileMerge interface over terminal-based diff tools

Alternatives:

opendiff – Fmdiff is a wrapper that adds direct VCS integration for SVN/Mercurial, whereas opendiff is a generic macOS utility for comparing two files or directories.
meld – Meld is a cross-platform, open-source graphical diff and merge tool that serves a similar purpose but is not native to macOS.

Version History

Detected	Version	Rev	Change	Commit
Sep 13, 2024 7:10am		0	VERSION_BUMP	c6a82b62
Dec 1, 2022 2:39am		0	VERSION_BUMP	f4628091