feat(git): add gbcopy (#13847)

Signed-off-by: NunzioFornitto <FRNNNZ00C24B202G@studium.unict.it>

plugins/git/README.md

@@ -255,6 +255,7 @@ receive further support.
 | `git_current_user_name`  | Returns the `user.name` config value (Lives in `lib/git.zsh`)                                                  |
 | `git_develop_branch`     | Returns the name of the “development” branch: `dev`, `devel`, `development` if they exist, `develop` otherwise |
 | `git_main_branch`        | Returns the name of the main branch: `main` if it exists, `master` otherwise                                   |
+| `gbcopy`                 | Copies current branch name to clipboard                                                                        |
 | `grename <old> <new>`    | Renames branch `<old>` to `<new>`, including on the origin remote                                              |
 | `gbda`                   | Deletes all merged branches                                                                                    |
 | `gbds`                   | Deletes all squash-merged branches (**Note: performance degrades with number of branches**)                    |

plugins/git/git.plugin.zsh

@@ -49,6 +49,16 @@ function git_main_branch() {
   return 1
 }
 
+function gbcopy() {
+  command git rev-parse --git-dir &>/dev/null || return
+
+  local branch
+  branch="$(git_current_branch)" || return
+  [[ -n "$branch" ]] || return 1
+
+  print -rn -- "$branch" | clipcopy
+}
+
 function grename() {
   if [[ -z "$1" || -z "$2" ]]; then
     echo "Usage: $0 old_branch new_branch"