Some useful Git aliases that I use every day

.gitconfig

#
# Working with branches
#

# Get the current branch name (not so useful in itself, but used in
# other aliases)
branch-name = "!git rev-parse --abbrev-ref HEAD"
# Push the current branch to the remote "origin", and set it to track
# the upstream branch
publish = "!git push -u origin $(git branch-name)"
# Delete the remote version of the current branch
unpublish = "!git push origin :$(git branch-name)"
# Delete a branch and recreate it from master — useful if you have, say,
# a development branch and a master branch and they could conceivably go
# out of sync
recreate = "!f() { [[ -n $@ ]] && git checkout \"$@\" && git unpublish && git checkout master && git branch -D \"$@\" && git checkout -b \"$@\" && git publish; }; f"

# Fire up your difftool (e.g. Kaleidescope) with all the changes that
# are on the current branch.
code-review = difftool origin/master...

# Given a merge commit, find the span of commits that exist(ed) on that
# branch. Again, not so useful in itself, but used by other aliases.
merge-span = "!f() { echo $(git log -1 $2 --merges --pretty=format:%P | cut -d' ' -f1)$1$(git log -1 $2 --merges --pretty=format:%P | cut -d' ' -f2); }; f"

# Find the commits that were introduced by a merge
merge-log = "!git log `git merge-span .. $1`"
# Show the changes that were introduced by a merge
merge-diff = "!git diff `git merge-span ... $1`"
# As above, but in your difftool
merge-difftool = "!git difftool `git merge-span ... $1`"

# Interactively rebase all the commits on the current branch
rebase-branch = "!git rebase -i `git merge-base master HEAD`"

#
# Working with files
#

# Unstage any files that have been added to the staging area
unstage = reset HEAD
# Show changes that have been staged
diffc = diff --cached

# Mark a file as "assume unchanged", which means that Git will treat it
# as though there are no changes to it even if there are. Useful for
# temporary changes to tracked files
assume = update-index --assume-unchanged
# Reverse the above
unassume = update-index --no-assume-unchanged
# Show the files that are currently assume-unchanged
assumed = "!git ls-files -v | grep ^h | cut -c 3-"

# Checkout our version of a file and add it
ours = "!f() { git checkout --ours $@ && git add $@; }; f"
# Checkout their version of a file and add it
theirs = "!f() { git checkout --theirs $@ && git add $@; }; f"

# Delete any branches that have been merged into master
# See also: https://gist.github.com/robmiller/5133264
delete-merged-branches = "!git co master && git branch --merged | grep -v '\\*' | xargs -n 1 git branch -d"

@mpictor Although I came here for the publish alias that is going to make my life easier, that bc alias you provided is going to seriously streamline things locally for me. Like many teams, we use the Jira ticket number as the branch name and prefix each commit with it. Can't tell you how excited I am to just be able to run

git bc "Fooed some bars"

and it will commit

[XYZ-1234] Fooed some bars

❤️

Great compilation. This one is missing:
Run merge test to check for any conflicts beforehand.
mergetest = "!f(){ git merge --no-commit --no-ff \"$1\"; git merge --abort; echo \"Merge aborted\"; };f "

How is this nesting thing working, i.e. git merge-base... inside a git rebase alias...?

"!git rebase -i git merge-base master HEAD"

Awesome gist! Especially publish (which I'd call pub, i.e., even shorter, or pu (like @mpictor) for push upstream) and diffc (which I'd call ds, shorter again and it stands for diff --staged, which is easier for me to remember than diff --cached) are nice. There are some very powerful aliases among these, so be careful using them!

Pretty nice collection. :-)

@nocke Just like it did in shell scripts. To capture the output of the nested command you can use backticks:
"!git rebase -i `git merge-base master HEAD`"
Works well in legacy Bourne shell. Or you can use $() syntax:
"!git rebase -i $(git merge-base master HEAD)"
You probably saw a similar approach in publish and unpublish aliases.
Both examples will retrieve merge base commit hash first (e.g. 6488bc910...) and then do something like git rebase -i 6488bc910.... So it's all the matter of readability.

Useful and cool

There is git branch --show-current which may be a worthy replacement for your alias git branch-name