HN Explorer

Show HN: Deff – Side-by-side Git diff review in your terminal (github.com)

120 points by flamestro ↗ HN
deff is an interactive Rust TUI for reviewing git diffs side-by-side with syntax highlighting and added/deleted line tinting. It supports keyboard/mouse navigation, vim-style motions, in-diff search (/, n, N), per-file reviewed toggles, and both upstream-based and explicit --base/--head comparisons. It can also include uncommitted + untracked files (--include-uncommitted) so you can review your working tree before committing.

Would love to get some feedback

34 comments

[ 2.5 ms ] story [ 55.1 ms ] thread
meain
I have been using https://github.com/jeffkaufman/icdiff for the longest time to get side by side diffs.
flamestro
This looks great as well! I personally prefer a bit more context. Thats why I added a bit more of it to deff. It also allows to mark files as reviewed by pressing `r` which is quite handy for my flow.
rileymichael
getting users to adopt a new tool with its own incantations is a tough sell. git supports specifying an external pager so folks can plug in alternatives (such as https://github.com/dandavison/delta) while still using the familiar git frontend
yottamus 

    git difftool --tool=vimdiff
flamestro
I personally find vimdiff a bit harder to navigate for my usecase. The reason is that I am context unaware of the file often in larger projects and wanted something that allows me to check all lines in a touched file. However, I have to admit vimdiff comes quite close to what I need and is a great tool!
jbaber
I wrote a script that takes two git commits and opens all changed files in vimdiff tabs side by side. I find lots of things too hard to see in github gui. It depends one [tpope's vim-fugitive].

[tpope's vim-fugitive]: https://github.com/tpope/vim-fugitive

I'll paste it next time I'm on that machine.

llbbdd
I was looking for a good TUI tool for diffs recently, but I'm not sure yet if what I want exists already (and I don't think this tool does it (yet?)). I've been moving my workflow out of VSCode as I'm using TUI-driven coding agents more often lately but one thing I miss from my VSCode/GitHub workflow is the ability to provide a comment on lines or ranges in a diff to provide targeted feedback to the agent. Most diff tools seem to be (rightfully) focused on cleanly visualizing changes and not necessarily iterating on the change.

I admit I haven't looked super hard yet, I settled on configuring git to use delta [0] for now and I'm happy with it, but I'm curious if anyone has a workflow for reviewing/iterating on diffs in the terminal that they'd be willing to share. Also open to being told that I'm lightyears behind and that there's a better mental model for this.

[0] https://github.com/dandavison/delta/

teddyh 

  emacs --eval='(ediff-files "file1" "file2")'
(The “|” key toggles side-by-side view.)
[deleted]
(comment deleted)
k_bx
What I would love to see is "tig" replacement that is:

- even faster, especially if you have couple thousand files and just want to press "u" for some time and see them very quickly all get staged

- has this split-view diff opened for a file

Otherwise tig is one of my favorite tools to quickly commit stuff without too many key presses but with review abilities, i have its "tig status" aliased to "t"

raphinou
Looks interesting. I'm currently using https://tuicr.dev/ , of which I like that the first screen it shows is the choice of commit range you want to review. Might be something to consider for deff?
hatradiowigwam
vimdiff is pretty fast, and is likely installed on your linux system without you realizing it.
insane_dreamer
we need something like this in lazygit -- which is excellent all around but lacking in visual diffing/merging.

What is most useful though is a 3-panel setup, like JetBrains -- still the best git client I have worked with.

dec0dedab0de
looks pretty good at a glance, though I would like to see three views for handling conflicts. Target on the left, source on the right, and the combined result in the middle.

...I really just like the way the Jetbrains IDEs do it, and I wish there were a TUI version that I could launch automatically from the git cli.

greatgib
It blows my mind that nowadays, some random tools on internet tells you to do "curl -fsSL https://.... | bash" to install some "binary" things and a lot of people will do it without hesitation.

It probably explains why there is so many data leaks recently but it is like we did a 20 years jump back in time in terms of security in just a few years.

zem
will this play well with jj?
meain
Yup, this seems to work pretty well with jj
suralind
What you want is difftastic. No need to thank me.
spartanatreyu
You definitely need a gif or apng file showing it's use in the github readme.

And a link to an asciicinema would help a lot too.

---

Also, I'm not sure how useful the side-by-side view is.

The second example (https://github.com/flamestro/deff/blob/main/docs/example_02....) is confusing.

The left side has lines 1365-1371 having the same code as lines 1374-1380 on the right side, yet they're not aligned with each other.

Most diff views would put padding between lines 1364-1365 on the left side so lines 1365-1371 are aligned with 1374-1380 on the right side.

agavra
I just built a version of this a month ago that also allows you to add review comments so you can export them back to an Agent to fix: https://github.com/agavra/tuicr

Great work on deff, would love to brainstorm here :)

ivanjermakov
8 terminal lines are taken by the tool's UI. Could have been 2.
tty456
So, basically 'vim -d' in rust? cool
sourcegrift
Does it show moved codeblocks like reviewboard. Is that the second screenshot
xmorse
Check out Critique too if you are looking for a side by side diffs TUI

It uses opentui, the same framework uses by opencode.

It can also render diffs to images, pdf and html. Very useful for agents to share diffs in remote environments like Openclaw or Kimaki

https://github.com/remorses/critique