Improve save/load aliases

When `git load` is invoked it will check if the subject of the `HEAD`
commit message is `temp!`, if it is when the commit will be reset,
otherwise an error message is output and the commit remains untouched.

README.md

@@ -15,6 +15,8 @@ than remember the plumbing term of a specific command.
 * `delete` deletes an existing branch, shorthand for `git branch -D`.
 * `name` the name of the current branch.
 * `last` the name of the last branch checked out before the current branch.
+* `checkout-last` checkout the last branch, shorthand for
+  `git checkout $(git last)`.
 * `publish` push and set the tracking branch of a local branch to origin,
   shorthand for `git push -u origin <branch>`.
 * `unpublish` delete a remote branch, shorthand for `git push origin :<branch>`.
@@ -23,9 +25,10 @@ than remember the plumbing term of a specific command.
 * `changes` compare the list of commits on the local branch to another branch,
   e.g. when on a feature branch `git changes master` lists the commits which are
   not present on the master branch.
-* `save` like pushing to the stash but attached to a branch, shorthand for
-  `git commit -am temp`.
-* `load` like popping from the stash but attached to a branch, shorthand for
-  `git reset --mixed HEAD`.
+* `save` like pushing to the stash but attached to the current branch, shorthand
+  for `git commit -am "temp!"`.
+* `load` like popping from the stash but attached to the current branch, if
+  `HEAD` has the subject `temp!` then `git reset --mixed HEAD~` is executed,
+  otherwise the message `error: commit subject is not: temp!` is output.
 
 [git]: https://git-scm.com

config

@@ -11,6 +11,7 @@
 	delete = branch -D
 	name = rev-parse --abbrev-ref HEAD
 	last = !sh -c 'git reflog | grep \" checkout: moving from\" | head -n 1 | awk \"{ print \\$6 }\"'
+	checkout-last = !git checkout `git last`
 
 	publish = !git push -u origin `git name`
 	unpublish = !git push -u origin :`git name`
@@ -20,8 +21,9 @@
 	tree = log --graph --abbrev-commit --oneline --decorate \
 --format=format:'%C(yellow)%h%C(reset) %C(blue)%aD%C(reset) %C(green)(%ar)%C(reset)%C(bold)%d%C(reset)%n        %C(white)%s%C(reset) %C(dim white)- %an%C(reset)'
 
-	save = commit -am temp
-	load = reset --mixed HEAD~
+	save = commit -am "temp!"
+	load = !sh -c '[ \"temp!\" = \"`git show --format=%s --no-patch`\" ] && \
+		git reset --mixed HEAD~ || echo \"error: commit subject is not: temp!\"'
 
 [commit]
 	verbose = true