Git related zsh aliases

.zshrc

switch_back_to_branch() {
  # get the current branch name
  current_branch=$(git rev-parse --abbrev-ref HEAD)
  # pull target branch
  git fetch origin $1:$1
  # switch to target branch
  git checkout $1
  # if -d is passed as second argument, delete the current branch
  if [ "$2" = "-d" ]; then
    # delete old branch and suppress error if branch is not merged
    git branch -d $current_branch 2>/dev/null
  fi
  # fetch all branches and prune
  git fetch --all --prune
}
alias sb='switch_back_to_branch'
alias nb='git checkout -b $1'
alias status='git status'
alias gs='status'
alias commit='git commit --all --message $1'
alias gc='commit'
alias amend='git commit --amend --no-edit --all'
alias ga='amend'
alias rebase='git pull origin $1 --rebase'
alias gr='rebase'
# push set to upstream branch
push_to_remote_or_normal() {
  # if upstream branch is not set, set it
  if [ -z "$(git rev-parse --abbrev-ref @{upstream} 2> /dev/null)" ]; then
    git push --set-upstream origin $(git rev-parse --abbrev-ref HEAD)
  else
    git push
  fi
}
alias push='push_to_remote_or_normal'