behold the COMMENTER

plugin/comment.vim

@@ -0,0 +1,54 @@
+let s:comment_filetype_map = {
+            \ 'c': '\/\/',
+            \ 'cpp': '\/\/',
+            \ 'java': '\/\/',
+            \ 'vhdl': '--',
+            \ 'python': '#',
+            \ 'vim': '"',
+            \ 'tex': '%',
+            \ 'sh': '#'
+            \ }
+
+let s:block_filetype_map = {
+            \ 'c': ['\/\*', '\*\/'],
+            \ 'java': ['\/\*', '\*\/'],
+            \ 'cpp': ['\/\*', '\*\/'],
+            \ 'python': ['"""', '"""'],
+            \ 'vim': ['" {{{', '" }}}']
+            \ }
+
+function! MyCommenter(uncomment) range
+    let comment = get(s:comment_filetype_map, &ft, '')
+    if !len(comment)
+        return
+    endif
+    let search_range = a:firstline . ',' . a:lastline
+    if !a:uncomment
+        execute search_range . 's/\(^\s*\)\(\S\)/\1' . comment . ' \2/e'
+    else
+        execute search_range . 's/\(^\s*\)' . comment . '\s*/\1/e'
+    endif
+    nohl
+endfunction
+
+function! MyBlocker(unblock) range
+    let block = get(s:block_filetype_map, &ft, [])
+    if !len(block)
+        return
+    endif
+    if !a:unblock
+        execute 'normal! ' . a:lastline . 'gg'
+        execute 'normal! o' . substitute(block[1], '\', '', 'g') . "\<esc>"
+        execute 'normal! ' . a:firstline . 'gg'
+        execute 'normal! O' . substitute(block[0], '\', '', 'g') . "\<esc>"
+    else
+        execute 'normal! ?' . block[0] . "\<cr>" . 'dd'
+        execute 'normal! /' . block[1] . "\<cr>" . 'dd'
+    endif
+    noh
+endfunction
+
+command! -range CommenseComment <line1>,<line2>call MyCommenter(0)
+command! -range CommenseUncomment <line1>,<line2>call MyCommenter(1)
+command! -range CommenseBlock <line1>,<line2>call MyBlocker(0)
+command! -range CommenseUnblock <line1>,<line2>call MyBlocker(1)