v0.7.0

### Breaking changes

* The minimum supported Rust version (MSRV) is now 1.61.0.

* The `jj touchup` command was renamed to `jj diffedit`.

* The `-i` option to `jj restore` was removed in favor of new `--from`/`--to`
  options to `jj diffedit`.

* To report the situation when a change id corresponds to multiple visible
  commits, `jj log` now prints the change id in red and puts `??` after it.
  Previously, it printed the word "divergent".

* `jj log` prefixes commit descriptions with "(empty)" when they contain no
  change compared to their parents.

* The `author`/`committer` templates now display both name and email. Use
  `author.name()`/`committer.name()` to extract the name.

* Storage of the "HEAD@git" reference changed and can now have conflicts.
  Operations written by a new `jj` binary will have a "HEAD@git" reference that
  is not visible to older binaries.

* The `description` template keyword is now empty if no description set.
  Use `if(description, description, "(no description set)\n")` to get back
  the previous behavior.

* The `template.log.graph` and `template.commit_summary` config keys were
  renamed to `templates.log` and `templates.commit_summary` respectively.

* If a custom `templates.log` template is set, working-copy commit will
  no longer be highlighted automatically. Wrap your template with
  `label(if(current_working_copy, "working_copy"), ...)` to label the
  working-copy entry.

* The `ui.relative-timestamps` option has been removed. Use the
  `format_timestamp()` template alias instead. For details on showing relative
  timestamps in `jj log` and `jj show`, see [the documentation](docs/config.md).

* `jj op log` now shows relative timestamps by default. To disable, set
  `ui.oplog-relative-timestamps` to `false`.

* The global `--no-commit-working-copy` is now called `--ignore-working-copy`.

* The `diff.format` config option is now called `ui.diff.format`. The old name
  is still supported for now.

* `merge-tools.<name>.edit-args` now requires `$left`/`$right` parameters.
  The default is `edit-args = ["$left", "$right"]`.

* The builtin `jj update` and `jj up` aliases for `jj checkout` have been
  deleted.

* Change IDs are now rendered using letters from the end of the alphabet (from
  'z' through 'k') instead of the usual hex digits ('0' through '9' and 'a'
  through 'f'). This is to clarify the distinction between change IDs and commit
  IDs, and to allow more efficient lookup of unique prefixes. This change
  doesn't affect the storage format; existing repositories will remain usable.

### New features

* The default log format now uses the committer timestamp instead of the author
  timestamp.

* `jj log --summary --patch` now shows both summary and diff outputs.

* `jj git push` now accepts multiple `--branch`/`--change` arguments

* `jj config list` command prints values from config and `config edit` opens
  the config in an editor.

* `jj debug config-schema` command prints out JSON schema for the jj TOML config
  file format.

* `jj resolve --list` can now describe the complexity of conflicts.

* `jj resolve` now notifies the user of remaining conflicts, if any, on success.
  This can be prevented by the new `--quiet` option.

* Per-repository configuration is now read from `.jj/repo/config.toml`.

* Background colors, bold text, and underlining are now supported. You can set
  e.g. `color.error = { bg = "red", bold = true, underline = true }` in your
  `~/.jjconfig.toml`.

* The `empty` condition in templates is true when the commit makes no change to
  the three compared to its parents.

* `branches([needle])` revset function now takes `needle` as an optional
  argument and matches just the branches whose name contains `needle`.

* `remote_branches([branch_needle[, remote_needle]])` now takes `branch_needle`
  and `remote_needle` as optional arguments and matches just the branches whose
  name contains `branch_needle` and remote contains `remote_needle`.

* `jj git fetch` accepts repeated `--remote` arguments.

* Default remotes can be configured for the `jj git fetch` and `jj git push`
  operations ("origin" by default) using the `git.fetch` and `git.push`
  configuration entries. `git.fetch` can be a list if multiple remotes must
  be fetched from.

* `jj duplicate` can now duplicate multiple changes in one go. This preserves
  any parent-child relationships between them. For example, the entire tree of
  descendants of `abc` can be duplicated with `jj duplicate abc:`.

* `jj log` now highlights the shortest unique prefix of every commit and change
  id and shows the rest in gray. To customize the length and style, use the
  `format_short_id()` template alias. For details, see
  [the documentation](docs/config.md).

* `jj print` was renamed to `jj cat`. `jj print` remains as an alias.
  
* In content that goes to the terminal, the ANSI escape byte (0x1b) is replaced
  by a "␛" character. That prevents them from interfering with the ANSI escapes
  jj itself writes.

* `jj workspace root` prints the root path of the current workspace.

* The `[alias]` config section was renamed to `[aliases]`. The old name is
  still accepted for backwards compatibility for some time.

* Commands that draw an ASCII graph (`jj log`, `jj op log`, `jj obslog`) now
  have different styles available by setting e.g. `ui.graph.style = "curved"`.

* `jj split` accepts creating empty commits when given a path. `jj split .`
  inserts an empty commit between the target commit and its children if any,
  and `jj split any-non-existent-path` inserts an empty commit between the
  target commit and its parents.

* Command arguments to `ui.diff-editor`/`ui.merge-editor` can now be specified
  inline without referring to `[merge-tools]` table.

* `jj rebase` now accepts a new `--allow-large-revsets` argument that allows the
  revset in the `-d` argument to expand to several revisions. For example,
  `jj rebase -s B -d B- -d C` now works even if `B` is a merge commit.

* `jj new` now also accepts a `--allow-large-revsets` argument that behaves
  similarly to `jj rebase --allow-large-revsets`.

* `jj new --insert-before` inserts the new commit between the target commit and
  its parents.

* `jj new --insert-after` inserts the new commit between the target commit and
  its children.

* `author`/`committer` templates now support `.username()`, which leaves out the
  domain information of `.email()`.

* It is now possible to change the author format of `jj log` with the
  `format_short_signature()` template alias. For details, see
  [the documentation](docs/config.md).

* Added support for template aliases. New symbols and functions can be
  configured by `template-aliases.<name> = <expression>`. Be aware that
  the template syntax isn't documented yet and is likely to change.

### Fixed bugs

* When sharing the working copy with a Git repo, we used to forget to export
  branches to Git when only the working copy had changed. That's now fixed.

* Commit description set by `-m`/`--message` is now terminated with a newline
  character, just like descriptions set by editor are.

* The `-R`/`--repository` path must be a valid workspace directory. Its
  ancestor directories are no longer searched.

* Fixed a crash when trying to access a commit that's never been imported into
  the jj repo from a Git repo. They will now be considered as non-existent if
  referenced explicitly instead of crashing.

* Fixed handling of escaped characters in .gitignore (only keep trailing spaces
  if escaped properly).

* `jj undo` now works after `jj duplicate`.

* `jj duplicate` followed by `jj rebase` of a tree containing both the original
  and duplicate commit no longer crashes. The fix should also resolve any remaining
  instances of https://github.com/martinvonz/jj/issues/27.

* Fix the output of `jj debug completion --help` by reversing fish and zsh text.

* Fixed edge case in `jj git fetch` when a pruned branch is a prefix of another
  branch.

### Contributors

Thanks to the people who made this release happen!

 * Aleksandr Mikhailov (@AM5800)
 * Augie Fackler (@durin42)
 * Benjamin Saunders (@Ralith)
 * Daniel Ploch (@torquestomp)
 * Danny Hooper (@hooper)
 * David Barnett (@dbarnett)
 * Glen Choo (@chooglen)
 * Herby Gillot (@herbygillot)
 * Ilya Grigoriev (@ilyagr)
 * Luke Granger-Brown (@lukegb)
 * Martin von Zweigbergk (@martinvonz)
 * Michael Forster (@MForster)
 * Philip Metzger (@PhilipMetzger)
 * Ruben Slabbert (@rslabbert)
 * Samuel Tardieu (@samueltardieu)
 * Tal Pressman (@talpr)
 * Vamsi Avula (@avamsi)
 * Waleed Khan (@arxanas)
 * Yuya Nishihara (@yuja)