Add copy current git branch name binding

utilities/utilities.plugin.zsh

@@ -203,3 +203,18 @@ function .fzf-history-search() {
 }
 zle -N .fzf-history-search
 bindkey '^R' .fzf-history-search
+
+# Copy the branch name checked out in the current worktree to the clipboard,
+# falling back to the abbreviated commit when HEAD is detached.
+function .copy-git-branch() {
+  local branch
+  branch=$(git symbolic-ref --quiet --short HEAD 2>/dev/null) ||
+    branch=$(git rev-parse --short HEAD 2>/dev/null)
+  if [[ -n "$branch" ]]; then
+    print -rn -- "$branch" | copy
+  else
+    zle -M "not a git worktree"
+  fi
+}
+zle -N .copy-git-branch
+bindkey -p '^X^B' .copy-git-branch