LLllimllib·May 24, 2025
I use fastmod[1] and enjoy it
[1]: https://github.com/facebookincubator/fastmod
In Far – Sublime Inspired Find and Replacefacebookincubator
fastmod
Rust2018–2025
facebookincubator / fastmod
fastmod
A fast partial replacement for the codemod tool. Assists with large-scale codebase refactors via regex-based find and replace with human oversight and occasional intervention.
6Distinct people
7Mentions
0Explicit recommenders
1.9KGitHub stars
What to know before exploring
What it is
A fast partial replacement for the codemod tool. Assists with large-scale codebase refactors via regex-based find and replace with human oversight and occasional intervention.
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
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This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:56:07 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year7 dated mentions
Observed mentions: 2018-04-19 23:14:23 UTC to 2025-05-24 19:11:23 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2018 | 2018-01-01 00:00:00 UTC | 2019-01-01 00:00:00 UTC | 2 | 1 | 1 |
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 2 | 0 | 2 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2025 | 2025-01-01 00:00:00 UTC | 2026-01-01 00:00:00 UTC | 1 | 0 | 1 |
What Hacker News says
7 sourcesWould’ve been easy with fastmod: https://github.com/facebookincubator/fastmod
In Refactoring Python with Tree-sitter and JediThis looks pretty neat! I especially like how well it composes with other tools.
Wonder how well it compares with fastmod [0]? That's what I've been using for large scale codemods/refactors. ripgrep is ofc insanely fast so ripgrep+ren would probably fare favorably.
[0]: https://github.com/facebookincubator/fastmod/
In Rep and Ren: A new approach to CLI find, replace, and renaminghttps://github.com/facebookincubator/fastmod is also great for the replace usecase.
In Ripgrep 14 ReleasedFor agr, have you seen fastmod? https://github.com/facebookincubator/fastmod
In Ask HN: Have you created programs for only your personal use?I basically live in vim and tmux when I'm doing development work. Tmux IMO basically turns a terminal from a handy utility to a fully productive workspace.
I switched to ripgrep for my grepping needs, I find it fast and the syntax and output coloring handy.
Just found fastmod recently, https://github.com/facebookincubator/fastmod. Very handy for doing bulk substitutions of strings in project directories - it can prompt with a diff for every change and do full regexes, so you can try out tricky things and make sure it isn't doing anything crazy before you let it make 500 changes throughout your repo.
Also a fan of gitsh, https://github.com/thoughtbot/gitsh. Helps out with using Git on the command line just the right amount IMO - just avoiding the git prefix, tab completion, and a little syntax highlighting, instead of trying to redo the wh
Read the rest
ole interface.
I don't use it that much, but jq, https://stedolan.github.io/jq/ is really handy for slicing and dicing json data without diving into the complexity of writing actual programs.
And on OS X, homebrew is indispensable for actually managing all of your CLI programs.
I also have found this Google Drive cli handy, https://github.com/odeke-em/drive. If you want to sync some but not all of your Google Drive files, and only push and pull on command instead of continuously, it's great.
fastmod: A fast partial replacement for the codemod tool
6 points · Open discussion