working-with-jj
JJ (Jujutsu) Version Control Helper
Core Principles
- Change IDs (immutable) vs Commit IDs (content-based hashes that change on edit)
- Operations log - every operation can be undone (progressive: multiple
jj undogoes further back,jj redoreverses) - No staging area - working copy auto-snapshots
- Conflicts don't block - resolve later
- Commits are lightweight - edit freely
- Colocated by default - Git repos have both
.jjand.git(since v0.34) - Three DSLs:
- revsets: select across revisions - a revision (change) ID is a trivial but fully valid singleton revset
- filesets: select across files in the repository - a regular filepath is a trivial but fully valid singleton fileset
- templates: select which info to log and how to show it
- Many jj commands expect expressions using either of these DSLs, to select what to show/operate on
Essential Commands
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