fastmod – fast partial replacement for codemod

fastmod is a tool to assist you with large-scale codebase refactors that can be partially automated but still require human oversight and occasional intervention. It’s a find/replace tool for programmers.

Example: Let’s say you’re deprecating your use of the tag. From the command line, you might make progress by running:

 fastmod -m -d www --extensions php,html \
      '(.*?)' \
      '${2}'

For each match of the regex, you’ll be shown a colored diff and asked if you want to accept the change, reject it, or edit the line in question in your $EDITOR of choice.

NOTE: Whereas codemod uses Python regexes, fastmod uses the Rust regex crate, which supports a slightly different regex syntax and does not support look around or backreferences. In particular, use ${1} instead of \1 to get the contents of the first capture group, and use $$ to write a literal $ in the replacement string.

A consequence of this syntax is that the use of single quotes instead of double quotes around the replacement text is important, because the bash shell itself cares about the $ character in double-quoted strings. If you must double-quote your input text, be careful to escape $ characters properly.

Website: github.com/facebookincubator/fastmod
Support:
Developer: Scott Wolchok
License: Apache License 2.0

fastmod is written in Rust. Learn Rust with our recommended free books and free tutorials.

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