v0.5.0

Breaking changes

• Open commits are now disabled by default. That means that jj checkout will
  always create a new change on top of the specified commit and will let you
  edit that in the working copy. Set ui.enable-open-commits = true to restore
  the old behavior and let us know that you did so we know how many people
  prefer the workflow with open commits.

• jj [op] undo and jj op restore used to take the operation to undo or
  restore to as an argument to -o/--operation. It is now a positional
  argument instead (i.e. jj undo -o abc123 is now written jj undo abc123).

• An alias that is not configured as a string list (e.g. my-status = "status"
  instead of my-status = ["status"]) is now an error instead of a warning.

• jj log now defaults to showing only commits that are not on any remote
  branches (plus their closest commit on the remote branch for context). This
  set of commits can be overridden by setting ui.default-revset. Use
  jj log -r 'all()' for the old behavior. Read more about revsets
  here.
  #250

• jj new now always checks out the new commit (used to be only if the parent
  was @).

• jj merge now checks out the new commit. The command now behaves exactly
  like jj new, except that it requires at least two arguments.

• When the working-copy commit is abandoned by jj abandon and the parent
  commit is open, a new working-copy commit will be created on top (the open
  parent commit used to get checked out).

• jj branch now uses subcommands like jj branch create and
  jj branch forget instead of options like jj branch --forget.
  #330

• The $NO_COLOR environment variable no longer
  overrides the ui.color configuration if explicitly set.

• jj edit has been renamed to jj touchup, and jj edit is now a new command
  with different behavior. The new jj edit lets you edit a commit in the
  working copy, even if the specified commit is closed.

• jj git push no longer aborts if you attempt to push an open commit (but it
  now aborts if a commit does not have a description).

• jj git push now pushes only branches pointing to the @ by default. Use
  --all to push all branches.

• The checkouts template keyword is now called working_copies, and
  current_checkout is called current_working_copy.

New features

• The new jj interdiff command compares the changes in commits, ignoring
  changes from intervening commits.

• jj rebase now accepts a --branch/-b <revision> argument, which can be used
  instead of -r or -s to specify which commits to rebase. It will rebase the
  whole branch, relative to the destination. The default mode has changed from
  -r @ to -b @.

• The new jj print command prints the contents of a file in a revision.

• The new jj git remotes list command lists the configured remotes and their
  URLs.
  #243

• jj move and jj squash now lets you limit the set of changes to move by
  specifying paths on the command line (in addition to the --interactive
  mode). For example, use jj move --to @-- foo to move the changes to file
  (or directory) foo in the working copy to the grandparent commit.

• When jj move/squash/unsquash abandons the source commit because it became
  empty and both the source and the destination commits have non-empty
  descriptions, it now asks for a combined description. If either description
  was empty, it uses the other without asking.

• jj split now lets you specify on the CLI which paths to include in the first
  commit. The interactive diff-editing is not started when you do that.

• Sparse checkouts are now supported. In fact, all working copies are now
  "sparse", only to different degrees. Use the jj sparse command to manage
  the paths included in the sparse checkout.

• Configuration is now also read from ~/.jjconfig.toml.

• The $JJ_CONFIG environment variable can now point to a directory. If it
  does, all files in the directory will be read, in alphabetical order.

• The $VISUAL environment is now respected and overrides $EDITOR. The new
  ui.editor config has higher priority than both of them. There is also a new
  $JJ_EDITOR environment variable, which has even higher priority than the
  config.

• You can now use - and + in revset symbols. You used to have to quote
  branch names like my-feature in nested quotes (outer layer for your shell)
  like jj co '"my-feature"'. The quoting is no longer needed.

• The new revset function connected(x) is the same as x:x.

• The new revset function roots(x) finds commits in the set that are not
  descendants of other commits in the set.

• ssh-agent is now detected even if $SSH_AGENT_PID is not set (as long as
  $SSH_AUTH_SOCK is set). This should help at least macOS users where
  ssh-agent is launched by default and only $SSH_AUTH_SOCK is set.

• When importing from a git, any commits that are no longer referenced on the
  git side will now be abandoned on the jj side as well. That means that
  jj git fetch will now abandon unreferenced commits and rebase any local
  changes you had on top.

• jj git push gained a --change <revision> argument. When that's used, it
  will create a branch named after the revision's change ID, so you don't have
  to create a branch yourself. By default, the branch name will start with
  push-, but this can be overridden by the push.branch-prefix config
  setting.

• jj git push now aborts if you attempt to push a commit without a
  description or with the placeholder "(no name/email configured)" values for
  author/committer.

• Diff editor command arguments can now be specified by config file.
  Example:

  [merge-tools.kdiff3]
  program = "kdiff3"
  edit-args = ["--merge", "--cs", "CreateBakFiles=0"]
  

• jj branch can accept any number of branches to update, rather than just one.

• Aliases can now call other aliases.

• jj log now accepts a --reversed option, which will show older commits
  first.

• jj log now accepts file paths.

• jj obslog now accepts -p/--patch option, which will show the diff
  compared to the previous version of the change.

• The "(no name/email configured)" placeholder value for name/email will now be
  replaced if once you modify a commit after having configured your name/email.

• Color setting can now be overridden by --color=always|never|auto option.

• jj checkout now lets you specify a description with --message/-m.

• jj new can now be used for creating merge commits. If you pass more than
  one argument to it, the new commit will have all of them as parents.

Fixed bugs

• When rebasing a conflict where one side modified a file and the other side
  deleted it, we no longer automatically resolve it in favor of the modified
  content (this was a regression from commit c0ae4b1).

• Errors are now printed to stderr (they used to be printed to stdout).

• Updating the working copy to a commit where a file's executable bit changed
  but the contents was the same used to lead to a crash. That has now been
  fixed.

• If one side of a merge modified a directory and the other side deleted it, it
  used to be considered a conflict. The same was true if both sides added a
  directory with different files in. They are now merged as if the missing
  directory had been empty.

• When using jj move to move part of a commit into an ancestor, any branches
  pointing to the source commit used to be left on a hidden intermediate commit.
  They are now correctly updated.

• jj untrack now requires at least one path (allowing no arguments was a UX
  bug).

• jj rebase now requires at least one destination (allowing no arguments was a
  UX bug).

• jj restore --to <rev> now restores from the working copy (it used to restore
  from the working copy's parent).

• You now get a proper error message instead of a crash when $EDITOR doesn't
  exist or exits with an error.

• Global arguments, such as --at-op=<operation>, can now be passed before
  an alias.

• Fixed relative path to the current directory in output to be . instead of
  empty string.

• When adding a new workspace, the parent of the current workspace's current
  checkout will be checked out. That was always the intent, but the root commit
  was accidentally checked out instead.

• When checking out a commit, the previous commit is no longer abandoned if it
  has a non-empty description.

• All commands now consistently snapshot the working copy (it was missing from
  e.g. jj undo and jj merge before).