Vim Airline no GitBranch name [doing echo fugitive#head() shows correct branch]

Question

I have Fugitive vim and Airline vim installed via Vundle. I installed them as follow:

Plugin 'https://github.com/tpope/vim-fugitive.git'
Plugin 'vim-airline/vim-airline'

Airline status works fine. All of the functions in Fugitive works fine, such as Gcommit, Gpush... Now, I just want to have the name of the branch shows up on Airline. I've been searching around a lot, and most of the time, the problem is that doing :echo fugitive#head() does not show the correct branch. Mine works. It shows the correct branch. So, how to get it shows up in Vim Airline status bar? I tried: 152 let g:airline#extensions#branch#enabled = 1, this does not work.

I even tried to clean up entire .vim and .vimrc (start fresh from zero) and reinstalled Vundle, Fugitive, Airline... Still, the same problem occurs. What else do I need to add to my vimrc to make this works? Please let me know and thank you.

The .vimrc is as follow:

set nocompatible              " be iMproved, required
filetype off                  " required

" set the runtime path to include Vundle and initialize
set rtp+=~/.vim/bundle/Vundle.vim
call vundle#begin()
" alternatively, pass a path where Vundle should install plugins
"call vundle#begin('~/some/path/here')

" let Vundle manage Vundle, required
Plugin 'VundleVim/Vundle.vim'
Plugin 'https://github.com/Valloric/YouCompleteMe.git'  
Plugin 'https://github.com/ajh17/VimCompletesMe.git'
Plugin 'vim-airline/vim-airline'
Plugin 'https://github.com/tomasiser/vim-code-dark.git'
Plugin 'https://github.com/tpope/vim-fugitive.git' 
Plugin 'https://github.com/scrooloose/nerdcommenter.git' 


" All of your Plugins must be added before the following line
call vundle#end()            " required
filetype plugin indent on    " required
" To ignore plugin indent changes, instead use:
"filetype plugin on
"
" Brief help
" :PluginList       - lists configured plugins
" :PluginInstall    - installs plugins; append `!` to update or just :PluginUpdate
" :PluginSearch foo - searches for foo; append `!` to refresh local cache
" :PluginClean      - confirms removal of unused plugins; append `!` to auto-approve removal
"
" see :h vundle for more details or wiki for FAQ
" Put your non-Plugin stuff after this line    

""""""""""""""""""  KEY MAPPINGS """"""""""""""""""""""""  

"To resize split
nnoremap <C-Right> <C-W>>
nnoremap <C-Left> <C-W><

nnoremap <C-Down>  :exe "resize " . (winheight(0) * 3/2)<CR>
nnoremap <C-Up>  :exe "resize " . (winheight(0) * 2/3)<CR>


"Move between splits   

nnoremap <C-J> <C-W><C-J>
nnoremap <C-K> <C-W><C-K>
nnoremap <C-L> <C-W><C-L>
nnoremap <C-H> <C-W><C-H>

"Move between tabs 

map <C-t><up> :tabr<cr>

map <C-t><down> :tabl<cr>

map <C-t><left> :tabp<cr>

map <C-t><right> :tabn<cr>

"Buffer maps
:nnoremap <C-n> :bnext<CR>
:nnoremap <C-p> :bprevious<CR>


map <F12> :!sh -xc 'clear && gfortran shocktest.f95 && ./a.out' <enter>

map <F8> :!sh -xc 'gnuplot shockplot &&  eog --fullscreen RHO.png ' <enter>   

""""""""""""""""""  THEMES  """"""""""""""""""""""""  

colo codedark 
set cursorline 
hi MatchParen cterm=bold ctermbg=yellow ctermfg=red
""""""""""""""" AIRLINE STUFF """"""""""""""""""""""

let g:airline_theme='codedark'
let g:airline_section_b = '%{strftime("%I:%M %p")}'
let g:airline#extensions#branch#enabled = 1



"""""""""""""""" FORTRAN STUFF """"""""""""""""""""""""

" Ensure correct highlighting for
" Fortran free-form source code
" and turn syntax highlighting on
let fortran_free_source=1
let fortran_do_enddo=1
filetype plugin indent on
syntax on

" Turn on line numbers and
" row/column numbers
set nu
set ruler

" Make vim echo commands as they
" are being entered.
set showcmd

" Set tabstops to two spaces
" and ensure tab characters are
" expanded into spaces.
set smarttab
set expandtab
set tabstop=2
set shiftwidth=2

" Fix backspace key
set bs=2

" Set up searching so
" that it jumps to matches
" as the word is being
" entered and is case-insensitive
set incsearch
set ignorecase
set smartcase

" Uncomment the following lines to make
" vim automatically create a backup copy
" each time a file is edited.
"
" If you enable this feature, be sure to
"
"   mkdir ~/codeBackups
"
" or it won't work.
"set backupdir=~/codeBackups
"set backup

Answer 1

Had the same issue. Adding branch in airline_extension list solved the issue for me

let g:airline_extensions = ['hunks', 'branch', 'tabline']

Without branch in the list, it was not loading the branch extension altogether.