vim-airline_custom_branch_name.vim

" We're using branch names like:
"    - feature/hd-1234_tiny_description
"    - feature/HD_4321_tiny_description
"    - chore/tiny_description
" where '1234' refers to a Jira ticket.
"
" The following, if working on a feature, extracts Jira ticket number 
" and set it as branch name in vim-airline.

let g:airline#extensions#branch#format = 'GetJiraTicketNumber'
function GetJiraTicketNumber(name) abort
  if a:name =~# 'feature'
    return matchlist(a:name, 'feature\/HD[-_]\(\d\{4}\)')[1]
  else
    return a:name
  endif
endfunction