zed/extensions/EXTRACTION.md

Extracting an extension to dedicated repo

These are some notes of how to extract an extension from the main zed repository and generate a new repository which preserves the history as best as possible. In the this example we will be extracting the ruby extension, substitute as appropriate.

Pre-requisites

Install git-filter-repo:

brew install git-filter-repo

Process

1. Create an expressions.txt file somewhere (e.g. ~/projects/expressions.txt)

ruby: ==>
extension: ==>
chore: ==>
zed_extension_api: ==>
regex:(?<![\[a-zA-Z0-9])(#[0-9]{3,5})==>zed-industries/zed\1

This file takes the form of patern==>replacement, where the replacement is optional. Note whitespace matters so ruby: ==> is removing the ruby: prefix from a commit messages and adding a space after ==> means the replacement begins with a space. Regex capture groups are numbered \1, \2, etc.

See: Git Filter Repo Docs for more.

2. Create a clean clone the zed repository, delete tags, delete branches and do the work.

Note

If you get zsh: command not found: # errors, run: setopt interactive_comments && echo "setopt interactive_comments" >> ~/.zshrc

rm -rf zed3
git clone --single-branch --no-tags git@github.com:zed-industries/zed.git zed3
cd zed3

# This removes the LICENSE symlink
git filter-repo --invert-paths --path extensions/ruby/LICENSE-APACHE

git filter-repo \
    --use-mailmap \
    --subdirectory-filter extensions/ruby/ \
    --path LICENSE-APACHE \
    --replace-message ~/projects/expressions.txt

3. Review the commits.

This is your last chance to make any modifications. If you don't fix it now, it'll be wrong forever.

For example, a previous commit message was php/ruby: bump version to 0.0.5 which was replaced with php/bump version to 0.0.5 so I added a new line to expressions.txt with php/==> and next run it became bump version to 0.0.5.

4. [Optional] Generate tags

You can always add tags later, but it's a nice touch.

Show you all commits that mention a version number:

git log --grep="(\d+\.\d+\.\d+\.)" --perl-regexp --oneline --reverse

Then just:

git tag v0.0.2 abcd1234
git tag v0.0.3 deadbeef

Usually the initial extraction didn't mention a version number so you can just do that one manually.

4. Push to the new repo

Create a new empty repo on github under the zed-extensions organization.

git remote add origin git@github.com:zed-extensions/ruby
git push origin main --tags

5. [Optional]