Git alias to open GitHub page for current repository and current branch

.gitconfig

# place it for example in your `~/.gitconfig` file
# Usage:
# type `git openbranch` in a directory with a GitHub repository

[alias]
    openbranch = "!f() { \
        branch_name=$(git symbolic-ref --short HEAD); \
        origin_url=$(git config --get remote.origin.url); \
        if [[ \"$origin_url\" == git@github.com:* ]]; then \
            repo_url=\"https://github.com/${origin_url:15}\"; \
        else \
            repo_url=\"$origin_url\"; \
        fi; \
        repo_url=${repo_url%.git}; \
        branch_url=\"$repo_url/tree/$branch_name\"; \
        open \"$branch_url\"; \
    }; f"

Currently uses open to use a default system browser to open the constructed GitHub url.