] = "" ``` - why_it_matters: Apply a jj configuration condition based on environment variables in a repository development setup. - sources: , - gotchas: "Version: v0.39.0"; "--when.environments (required): List of environment conditions. Each item is `NAME=VALUE` to match that value, or `NAME` to match if set. Items in the list are alternatives (OR)."; "--scope (required): Conditional configuration table; its variables are expanded to the root config table."; "Multiple condition keys: If multiple `--when` conditions are specified, their intersection is used (AND)." ## jj gerrit upload accepts additional upload flags (jj, 2026-03-04) Published 2026-10-17 - slug: jj-gerrit-upload-accepts-additional-upload-flags-559f1eb825a5 - score: 0.92 How to use it: When uploading a jj change for Gerrit review, run `jj gerrit upload` with the desired reviewer and label flags. The release note gives `--reviewer=foo@example.com` and `--label=Auto-Submit` as examples. Examples: ``` jj gerrit upload --reviewer= --label= ``` - why_it_matters: Upload a jj change for review with reviewer or label options. - sources: , , - gotchas: "Version: v0.39.0"; "--reviewer=: Requests the specified account as a reviewer."; "--label=: Applies a review label. Gerrit documents label scores as optional; if omitted, the default is +1 when allowed."; "-r, --revisions : Selects revisions to upload; the v0.39.0 release note says the flag is no longer required and the command defaults to the current working revision."; "Prerequisite: Configure authentication for the Gerrit server before uploading."; "Prerequisite: Specify a Gerrit remote or configure a default remote; otherwise the command can fail if no `gerrit` remote exists."; "The release refers to Gerrit's documentation for the variety of supported flags; it does not enumerate them all." ## jj gerrit upload defaults to the current work (jj, 2026-03-04) Published 2026-10-17 - slug: jj-gerrit-upload-defaults-to-the-current-work-cad1d2dd6dc5 - score: 0.94 How to use it: When uploading the change currently being worked on for Gerrit review, run `jj gerrit upload` without `-r`; it defaults to the current work. [v0.39.0 release notes](https://github.com/jj-vcs/jj/releases/tag/v0.39.0) Examples: ``` jj gerrit upload ``` - why_it_matters: Upload the change currently being worked on for Gerrit review. - before: Pass `-r` to `jj gerrit upload` to select what to upload. - sources: - gotchas: "Version: v0.39.0"; "Without `-r`, the command defaults to uploading what you are currently working on." ## jj rebase adds --simplify-parents (jj, 2026-03-04) Published 2026-10-17 - slug: jj-rebase-adds-simplify-parents-8cadc905de73 - score: 0.92 How to use it: When rebasing commits and you want to remove parent edges that are ancestors of other parents, run `jj rebase --simplify-parents --onto `; with no source selector, jj rebases the default branch `@`. Examples: ``` jj rebase --simplify-parents --onto ``` - why_it_matters: Rebase commits while applying parent simplification to the rebased commits. - before: Rebase first, then run `jj simplify-parents` on the freshly rebased commits. - sources: , - gotchas: "Version: v0.39.0"; "--simplify-parents: Simplify parents of rebased commits by removing parents that are ancestors of other parents."; "--onto (required): Revision(s) to rebase onto; may be repeated to create a merge commit. A rebase destination is required."; "--branch, --source, or --revisions: Selects what to rebase. If none is supplied, the default is `--branch @`."; "Prerequisite: Use jj v0.39.0 or later for this flag." ## jj templates add list manipulation methods (jj, 2026-03-04) Published 2026-10-17 - slug: jj-templates-add-list-manipulation-methods-cdd5a1000805 - score: 0.97 How to use it: When a jj template needs list manipulation for repository inspection, call the list methods on a list value. Use `jj log -T` with a template such as `self.parents().reverse().take(2).map(|c| c.commit_id().short()).join("\n")` to inspect recent parents. Examples: ``` jj log -T 'self.parents().reverse().take(2).map(|c| c.commit_id().short()).join("\n")' ``` - why_it_matters: Manipulate list values in a jj template used for repository inspection. - sources: , - gotchas: "Version: v0.39.0"; "first(): Returns the first element; errors if the list is empty."; "last(): Returns the last element; errors if the list is empty."; "get(index: Integer) (required): Returns the element at the zero-based index; errors if out of bounds."; "reverse(): Returns the list in reverse order."; "skip(count: Integer) (required): Skips the first count elements and returns the rest."; "take(count: Integer) (required): Returns only the first count elements."; "These methods are supported on list types." ## jj templates add Timestamp::since (jj, 2026-03-04) Published 2026-10-17 - slug: jj-templates-add-timestamp-since-a8fe389549c1 - score: 0.94 How to use it: When a template needs a human-friendly duration between two timestamps, call `.since(start)` on the ending `Timestamp`, then call `.duration()` on the returned `TimestampRange`. Examples: ``` jj log -T 'self.committer().timestamp().since(self.author().timestamp()).duration()' ``` - why_it_matters: Display a human-friendly duration between timestamps in a jj template. - sources: , - gotchas: "Version: v0.39.0"; ".since(start: Timestamp) (required): Returns the `TimestampRange` between `start` and the receiver timestamp."; ".duration() (required): Returns a human-friendly duration string for a `TimestampRange`."; "Prerequisite: Use jj v0.39.0 or later; this template method is documented in the v0.39.0 templates reference." Next: https://sincecutoff.com/v1/changes.md?tool=jj&score=0&cursor=eyJzY29yZSI6MCwic2VxIjoxMjU4LCJzaW5jZSI6bnVsbCwidG9vbCI6ImpqIiwidiI6MX0 Save `next_cursor`; next visit, pass it to get only what was published since.