[UPDATE][VIM] Change to lightline status-line

I wanted to try something else, lightline seems more fun than the vanilla
statusline, and easier to modify than airline.

This is the bare minimum of status bar for me, without powerline
separators because I don't like them very much, and with basic
vim-fugitive integration.

vim/.vimrc

@@ -61,9 +61,9 @@ Plug 'nanotech/jellybeans.vim'
 " Another nice dark theme
 Plug 'morhetz/gruvbox'
 " Fancy status bar
-Plug 'vim-airline/vim-airline'
-" Themes for airline
-Plug 'vim-airline/vim-airline-themes'
+Plug 'itchyny/lightline.vim'
+" Add the gruvbox theme to my status line
+Plug 'shinchu/lightline-gruvbox.vim'
 " }}}
 
 " Minimum viable vim config {{{
@@ -197,6 +197,59 @@ let g:gruvbox_italic=1
 colorscheme gruvbox
 " }}}
 
+" Lightline settings {{{
+""""""""""""""""""""
+let g:lightline={}
+" Use the gruvbox colorscheme
+let g:lightline.colorscheme='gruvbox'
+let g:lightline.active={
+  \     'left': [
+  \         [ 'mode', 'paste' ],
+  \         [ 'gitbranch', 'readonly', 'filename', 'modified' ],
+  \         [ 'spell' ],
+  \     ],
+  \     'right': [
+  \         [ 'lineinfo' ],
+  \         [ 'percent' ],
+  \         [ 'fileformat', 'fileencoding', 'filetype' ],
+  \     ]
+  \ }
+let g:lightline.inactive={
+  \     'left': [
+  \         [ 'filename' ],
+  \     ],
+  \     'right': [
+  \         [ 'lineinfo' ],
+  \         [ 'percent' ],
+  \     ],
+  \ }
+let g:lightline.component_function={
+  \     'readonly': 'LightlineReadonly',
+  \     'modified': 'LightlineModified',
+  \     'gitbranch': 'LightlineFugitive',
+  \ }
+
+" Lightline function wrappers {{{
+"""""""""""""""""""""""""""""
+" Show a lock icon when editing a read-only file when it makes sense
+function! LightlineReadonly()
+    return &ft!~?'help\|vimfiler\|netrw' && &readonly ? '' : ''
+endfunction
+" Show a '+' when the buffer is modified, '-' if not, when it makes sense
+function! LightlineModified()
+    return &ft=~'help\|vimfiler\|netrw' ? '' : &modified ? '+' : &modifiable ? '' : '-'
+endfunction
+" Show branch name with nice icon in status line, when it makes sense
+function! LightlineFugitive()
+    if &ft!~?'help\|vimfiler\|netrw' && exists('*fugitive#head')
+            let branch=fugitive#head()
+            return branch!=#'' ? ' '.branch : ''
+    endif
+    return ''
+endfunction
+" }}}
+" }}}
+
 " UltiSnips settings {{{
 """"""""""""""""""""
 " Insert mode trigger for expansion