gitlab-org--gitlab-foss/doc/development/projections.md

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# Projections
Projections are a way to define relations between files. Every file can have a
"related" or "alternate" file. It's common to consider spec files to be
"alternate" files to source files.
## How to use it
- Install an editor plugin that consumes projections
- Copy `.projections.json.example` to `.projections.json`
## How to customize it
You can find a basic list of projection options in
[projectionist.txt](https://github.com/tpope/vim-projectionist/blob/master/doc/projectionist.txt)
## Which plugins can I use
- vim
- [vim-projectionist](https://github.com/tpope/vim-projectionist)
- VSCode
- [Alternate File](https://marketplace.visualstudio.com/items?itemName=will-wow.vscode-alternate-file)
- [projectionist](https://github.com/jarsen/projectionist)
- [`jumpto`](https://github.com/gmdayley/jumpto)
- Atom
- [projectionist-atom](https://atom.io/packages/projectionist-atom)
- Command-line
- [projectionist](https://github.com/glittershark/projectionist)
## History
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This started as a
[plugin for vim by tpope](https://github.com/tpope/vim-projectionist)
It has since become editor-agnostic and ported to most modern editors.
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