feat(jj): completions, aliases and prompt utils

plugins/jj/README.md

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+# jj - Jujutsu CLI
+
+This plugin provides autocompletion for [jj](https://martinvonz.github.io/jj).
+
+To use it, add `jj` to the plugins array of your zshrc file:
+
+```zsh
+plugins=(... jj)
+```
+
+## Prompt usage
+
+Because `jj` has a very powerful [template syntax](https://martinvonz.github.io/jj/latest/templates/), this
+plugin only exposes a convenience function `jj_prompt_template` to read information from the current change.
+It is basically the same as `jj log --no-graph -r @ -T $1`:
+
+```sh
+_my_theme_jj_info() {
+  jj_prompt_template 'self.change_id().shortest(3)'
+}
+
+PROMPT='$(_my_theme_jj_info) $'
+```
+
+`jj_prompt_template` escapes `%` signs in the output. Use `jj_prompt_template_raw` if you don't want that
+(e.g. to colorize the output).
+
+However, because `jj` can be used inside a Git repository, some themes might clash with it. Generally, you can
+fix it with a wrapper function that tries `jj` first and then falls back to `git` if it didn't work:
+
+```sh
+_my_theme_vcs_info() {
+  jj_prompt_template 'self.change_id().shortest(3)' \
+  || git_prompt_info
+}
+
+PROMPT='$(_my_theme_vcs_info) $'
+```
+
+You can find an example
+[here](https://github.com/nasso/omzsh/blob/e439e494f22f4fd4ef1b6cb64626255f4b341c1b/themes/sunakayu.zsh-theme).
+
+### Performance
+
+Sometimes `jj` can be slower than `git`.
+
+If you feel slowdowns, you can try adding `ZSH_THEME_JJ_IGNORE_WORKING_COPY=1` to your theme, which will add
+`--ignore-working-copy` to all calls made to `jj`. The downside here is that your prompt might stay outdated
+until the next time `jj` gets a chance to _not_ ignore the working copy.
+
+If you prefer to keep your prompt always up-to-date but still don't want to _feel_ the slowdown, you can make
+your prompt asynchronous. This plugin doesn't do this automatically so you'd have to hack your theme a bit for
+that.
+
+## See Also
+
+- [martinvonz/jj](https://github.com/martinvonz/jj)
+
+## Contributors
+
+- [nasso](https://github.com/nasso) - Plugin Author

plugins/jj/jj.plugin.zsh

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+# if jj is not found, don't do the rest of the script
+if (( ! $+commands[jj] )); then
+  return
+fi
+
+source <(jj util completion zsh)
+compdef _jj jj
+
+function __jj_prompt_jj() {
+  local flags=("--no-pager")
+  if (( ${ZSH_THEME_JJ_IGNORE_WORKING_COPY:-0} )); then
+    flags+=("--ignore-working-copy")
+  fi
+  command jj $flags "$@"
+}
+
+# convenience functions for themes
+function jj_prompt_template_raw() {
+  __jj_prompt_jj log --no-graph -r @ -T "$@" 2> /dev/null
+}
+
+function jj_prompt_template() {
+  local out
+  out=$(jj_prompt_template_raw "$@") || return 1
+  echo "${out:gs/%/%%}"
+}
+
+# Aliases (sorted alphabetically)
+alias j='jj'
+alias jb='jj branch'
+alias jbc='jj branch create'
+alias jbd='jj branch d'
+alias jbl='jj branch list'
+alias jbr='jj branch rename'
+alias jbs='jj branch set'
+alias jc='jj commit'
+alias jcmsg='jj commit --message'
+alias jd='jj diff'
+alias jdmsg='jj desc --message'
+alias jds='jj desc'
+alias je='jj edit'
+alias jgcl='jj git clone'
+alias jgf='jj git fetch'
+alias jgp='jj git push'
+alias jl='jj log'
+alias jn='jj new'
+alias jrb='jj rebase'
+alias jrs='jj restore'
+alias jrt='cd "$(jj root || echo .)"'
+alias js='jj squash'
+alias jsp='jj split'
+alias jsps='jj split --siblings'
+alias jst='jj st'
+alias jsto='jj squash --into'