Add Comment and UnComment mappings

1 files changed, 15 insertions, 0 deletions

diff --git a/vim/vimrc b/vim/vimrc
index 415212e..7156c73 100644
--- a/vim/vimrc
+++ b/vim/vimrc
@@ -201,6 +201,21 @@ nnoremap gJ :%!python3 -m json.tool<CR>
 " NERDTree plugin
 nnoremap <C-t> :NERDTreeToggle<CR>
 
+" Comment/UnComment lines
+" Ref.:
+" - https://vim.fandom.com/wiki/Comment/UnComment_visually_selected_text
+" - https://stackoverflow.com/a/1676672/7498073
+" - https://stackoverflow.com/a/9051932/7498073
+au FileType haskell,vhdl,ada let b:comment_leader = '-- '
+au FileType vim let b:comment_leader = '" '
+au FileType c,cpp,java let b:comment_leader = '// '
+au FileType sh,make let b:comment_leader = '# '
+au FileType tex let b:comment_leader = '% '
+" That  c_CTRL-R_=  thingy enters the "expression register".  And that  \V
+" tells  :s  to go into "Very NonMagic" mode.
+noremap ,c :s/^/<C-R>=escape(b:comment_leader,'\/')<CR>/<CR>:noh<CR>
+noremap ,u :s/^\V<C-R>=escape(b:comment_leader,'\/')<CR>//e<CR>:noh<CR>
+
 
 " Yanking and pasting
 " ----------------------------------------------------------------------