Update neovim config

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

nvim/init.vim

@@ -38,6 +38,7 @@ Plug 'christoomey/vim-conflicted'
 " For tmux yank
 Plug 'vim-utils/vim-husk'
 " Tags
+Plug 'steffanc/cscopemaps.vim'
 Plug 'ludovicchabant/vim-gutentags'
 " GDB
 Plug 'sakhnik/nvim-gdb', { 'do': ':!./install.sh \| UpdateRemotePlugins' }
@@ -55,13 +56,16 @@ Plug 'autozimu/LanguageClient-neovim' , {
     \ 'branch' : 'next',
     \ 'do' : './install.sh'
     \ }
+" For Nix
+Plug 'LnL7/vim-nix', { 'for': 'nix' }
 " For autocompletion
 Plug 'Shougo/deoplete.nvim', { 'do': ':UpdateRemotePlugins' }
 " Autocomplete for Python
 Plug 'zchee/deoplete-jedi'
 " Autocomplete for Rust
 Plug 'sebastianmarkow/deoplete-rust'
-Plug 'rust-lang/rust.vim'
+Plug 'cespare/vim-toml', { 'for': 'rust' }
+Plug 'rust-lang/rust.vim', { 'for': 'rust' }
 " Erlang Support
 Plug 'vim-erlang/vim-erlang-tags'
 Plug 'vim-erlang/vim-erlang-runtime'
@@ -74,6 +78,7 @@ Plug 'tpope/vim-eunuch'
 Plug 'jeetsukumaran/vim-buffergator'
 Plug 'vim-utils/vim-man'
 Plug 'unblevable/quick-scope'
+Plug 'igankevich/mesonic'
 
 " Initialize plugin system
 call plug#end()
@@ -309,7 +314,7 @@ let g:haskell_enable_typeroles = 1        " to enable highlighting of type roles
 let g:haskell_enable_static_pointers = 1  " to enable highlighting of `static`
 let g:haskell_backpack = 1                " to enable highlighting of backpack keywords
 
-let g:haskell_classic_highlighting = 1
+let g:haskell_classic_highlighting = 0
 let g:haskell_indent_if = 3
 let g:haskell_indent_case = 2
 let g:haskell_indent_let = 4
@@ -381,3 +386,8 @@ let g:gutentags_ctags_extra_args = [
       \ '--tag-relative=yes',
       \ '--fields=+ailmnS',
       \ ]
+
+" Default indentations
+autocmd BufRead,BufNewFile */gst-*/*.[ch] set et sw=2
+autocmd BufRead,BufNewFile */gstreamer-*/*.[ch] set et sw=2
+autocmd BufRead,BufNewFile */pulseaudio/*.[ch] set et sw=4 tw=128