git pmerge - pull & merge. Use with Windows (powershell) or Unix-like alike

pmerge.sh

# Usage:
# git checkout featureX
# git pmerge main

# When merging branch `main` into `featureX`, 
# one often has to pull from `main` to ensure 
# merging into the correct head.
# Assume you're on branch featureX
# >> git pmerge main
# executes:
# >> BRANCH=$(git branch --show-current) # BRANCH is featureX
# >> git checkout main
# >> git pull
# >> git checkout BRANCH
# >> git merge main

git config --global alias.pmerge '!f() { BRANCH=$(git branch --show-current); git checkout "$1" && git pull && git checkout "$BRANCH" && git merge "$1"; }; f'