nvim: Drop dependency on vim-airline

Use a custom status line and buftabline.

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

nvim/.config/nvim/init.vim

@@ -12,8 +12,8 @@ Plug 'haya14busa/incsearch-easymotion.vim'
 Plug 'junegunn/fzf.vim'
 " Remove extraneous whitespace when edit mode is exited
 Plug 'axelf4/vim-strip-trailing-whitespace'
-" Status bar mods
-Plug 'vim-airline/vim-airline'
+" Tabline
+Plug 'ap/vim-buftabline'
 " Manage Project sessions
 Plug 'thaerkh/vim-workspace'
 " Commenter
@@ -185,9 +185,6 @@ set completeopt=menu,noselect,preview,noinsert
 set sessionoptions-=blank
 set grepprg=rg\ --vimgrep
 
-" Theme
-colorscheme gruvbox8_hard
-
 " --------------------------- Key Bindings -----------------------------------
 " Remap escape keys to something usable on home row
 inoremap jk <Esc>
@@ -399,26 +396,6 @@ augroup ResizeWindowsProportionally
 augroup END
 
 " --------------------------- Plugin settings --------------------------------
-" Use airline
-let g:airline#extensions#keymap#enabled = 0
-let g:airline#extensions#whitespace#enabled = 0
-let g:airline#extensions#wordcount#enabled = 0
-let g:airline#extensions#term#enabled = 0
-let g:airline#extensions#tabline#enabled = 1
-let g:airline#extensions#tabline#fnamemod = ':t'
-let g:airline#extensions#tabline#left_sep = ' '
-let g:airline#extensions#tabline#left_alt_sep = '|'
-let g:airline#extensions#tabline#right_sep = ' '
-let g:airline#extensions#tabline#right_alt_sep = '|'
-let g:airline#extensions#tabline#formatter = 'default'
-let g:airline#extensions#tabline#buffer_nr_show = 1
-let g:airline_left_sep = ' '
-let g:airline_left_alt_sep = '|'
-let g:airline_right_sep = ' '
-let g:airline_right_alt_sep = '|'
-let g:airline_section_y = '%{winnr()}'
-let g:airline_highlighting_cache = 1
-
 " Let vim-gitgutter do its thing on large files
 let g:gitgutter_max_signs=1000
 let g:gitgutter_map_keys = 0
@@ -512,6 +489,11 @@ let g:grepper.prompt        = 0
 " Easymotion incsearch
 let g:incsearch#auto_nohlsearch = 1
 
+" Buftabline
+let g:buftabline_plug_max = 0
+let g:buftabline_numbers = 1
+let g:buftabline_indicators = 1
+
 " Deoplete
 let g:deoplete#enable_at_startup = 0
 let g:deoplete#sources#rust#disable_keymap = 1

nvim/.config/nvim/plugin/statusline.vim

@@ -0,0 +1,83 @@
+augroup UserStatusline
+  autocmd!
+  autocmd BufEnter,WinEnter,TermOpen * setlocal statusline=%!ActiveStatus()
+  autocmd WinLeave * setlocal statusline=%!PassiveStatus()
+augroup END
+
+augroup UserStatusLineColors
+  autocmd!
+  autocmd ColorScheme *
+	\ hi User1 guifg=DarkRed guibg=Black |
+        \ hi User2 guifg=White guibg=Black |
+        \ hi User3 guifg=Cyan guibg=Black |
+        \ hi User4 guifg=Orange guibg=Black |
+        \ hi User5 guifg=Red guibg=Black |
+        \ hi User6 guifg=Gray guibg=Black |
+        \ hi User7 guifg=Gray guibg=Black |
+        \ hi User8 guifg=DarkYellow guibg=Black
+augroup END
+
+function! GitInfo()
+  let git = fugitive#head()
+  if git != ''
+    return ' '.fugitive#head()
+  else
+    return ''
+endfunction
+
+" https://nest.pijul.com/tae/setup:master/
+function! GetCursorPosition()
+  if &buftype == ''
+    let l:position = getcurpos()
+    return l:position[1] . 'Ⲷ ' . l:position[2] . 'Ⲽ'
+  endif
+
+  return &buftype ==# 'quickfix'
+	\ ? line('.') . '/' . line('$')
+	\ : ''
+endfunction
+
+function! GetFileDir()
+  if &buftype != ''
+    return ''
+  endif
+
+  if &filetype ==# 'gitcommit'
+    return 'New commit on '
+  endif
+
+  if &filetype ==# 'gitrebase'
+    return 'Interactive rebase on '
+  endif
+
+  let l:path = expand('%:h')
+  return len(l:path) > 0 ? l:path : ''
+endfunction
+
+function! ActiveStatus() abort
+  let statusline=""
+  let statusline.="%1*\ %{winnr()}\ "
+  let statusline.="%2*\ %{GitInfo()}"
+  let statusline.="%2*\ %Y\ "
+  let statusline.="%3*%<%{GetFileDir()}"
+  let statusline.="%="
+  let statusline.="%4*\ %{GetCursorPosition()}\ (%3p%%)"
+  return statusline
+endfunction
+
+function! PassiveStatus() abort
+  let statusline=""
+  let statusline.="%5*\ %{winnr()}\ "
+  let statusline.="%6*\ %{GitInfo()}"
+  let statusline.="%6*\ %Y\ "
+  let statusline.="%7*%<%{GetFileDir()}"
+  let statusline.="%="
+  let statusline.="%8*\ %{GetCursorPosition()}\ (%3p%%)"
+  return statusline
+endfunction
+
+set statusline=%!ActiveStatus()
+" The colorscheme needs to be set here as it seems the autocmd group handling
+" color scheme must always be defined before the colorscheme is set else the
+" custom highlighting color groups for status line do not seem to take effect.
+colorscheme gruvbox8_hard