Add aliases for working with autosquash rebases

* Rename the `squash` alias to `prepare` to repurpose it.
* Change `squash` alias to `git commit --squash=<commit>`.
* Add `fixup` alias to `git commit --fixup=<commit>`.
* Set the `rebase.autoSquash` config option to `true`.

README.md

@@ -2,14 +2,18 @@
 
 ## Aliases
 
-A set of [Git][git] aliases which follow the idea "say what you mean" rather
-than remember the plumbing term of a specific command.
+A set of [Git][git] [aliases][aliases] which follow the idea "say what you mean"
+rather than remembering the plumbing term of a specific command.
 
 * `abandon` abandons all local changes leave a clean repository.
-* `amend` amends the last commit, shorthand for `git commit --amend`.
 * `unstage` unstage staged changes, shorthand for `git reset -q HEAD --`.
-* `squash` perform an interactive rebase to squash all commits since branching,
-  shorthand for `git rebase -i --fork-point`.
+* `amend` amends the last commit, shorthand for `git commit --amend`.
+* `fixup` prepare a fixup commit for use with
+  `git rebase --interactive --autosquash`, shorthand for `git commit --fixup`.
+* `squash` prepare a squash commit for use with
+  `git rebase --interactive --autosquash`, shorthand for `git commit --squash`.
+* `prepare` prepare a branch for merging into another, shorthand for
+  `git rebase --interactive --fork-point`.
 * `list` list local branches, a shorthand for `git branch`.
 * `create` creates a new branch, shorthand for `git checkout -b`.
 * `delete` deletes an existing branch, shorthand for `git branch -D`.
@@ -31,4 +35,15 @@ than remember the plumbing term of a specific command.
   `HEAD` has the subject `temp!` then `git reset --mixed HEAD~` is executed,
   otherwise the message `error: commit subject is not: temp!` is output.
 
+## Zsh Completions
+
+The excellent [Git][git] completions provided by [Zsh][zsh] which can see
+through [aliases][aliases] however some aliases involve multiple commands or
+rely on the shell to function. The following aliases extend the default
+[Git][git] completions.
+
+* `git changes` completions for the branch name to compare with are provided.
+
 [git]: https://git-scm.com
+[aliases]: https://git-scm.com/book/en/v2/Git-Basics-Git-Aliases
+[zsh]: https://www.zsh.org

_git-changes

@@ -1,7 +1,6 @@
 #compdef git-changes
 #description Compare changes on this branch with another.
 
-_arguments \
-  '1: :__git_remote_branch_names_noprefix'
+_arguments '1: :__git_remote_branch_names_noprefix'
 
 # vim: ft=zsh

config

@@ -2,9 +2,12 @@
 
 [alias]
 	abandon = !git reset --hard HEAD && git clean -d -f
-	amend = commit --amend
 	unstage = reset -q HEAD --
-	squash = rebase -i --fork-point
+
+	amend = commit --amend
+	fixup = commit --fixup
+	squash = commit --squash
+	prepare = rebase -i --fork-point
 
 	list = branch
 	create = checkout -b
@@ -49,6 +52,9 @@
 [push]
 	default = simple
 
+[rebase]
+	autoSquash = true
+
 [user]
 	useConfigOnly = true