• Vim 8.0 or later

• Supports 300+ filetypes (:help caw-supported-filetypes).
  • But caw.vim does not slow down your Vim startup because each comment string are defined at ftplugin files (after/ftplugin/<filetype>/caw.vim).
• Supports operator keymappings (:help caw-keymappings-operator).
  • If g:caw_operator_keymappings is non-zero, all default keymappings map to operator keymappings.
  • If you need kana/vim-operator-user to use operator keymappings.
• Supports also non-operator keymappings (:help caw-keymappings-non-operator).
• Dot-repeatable if you installed kana/vim-repeat
• The comment behavior only depends on 'filetype' by default. But if you have installed Shougo/context_filetype.vim, caw.vim also depends on the filetype of the context of the current cursor location. So you can comment/uncomment JavaScript in HTML correctly.
• Well-tested powered by thinca/vim-themis

The below are the examples in "filetype=c". caw.vim supports 300+ filetypes (:help caw-supported-filetypes).

Type "gci" (toggle: "gcc", uncomment: "gcui")
  before:
      "   <- inserted here"
  after:
      "   # <- inserted here"
Type "gcI" (uncomment: "gcuI")
  before:
      "   inserted the first column"
  after:
      "#    inserted the first column"
Type "gca" (uncomment: "gcua")
  before:
      "inserted after this"
  after:
      "inserted after this    # "
Type "gcw" (uncomment: "gcuw")
  before:
      "  wrap!"
  after:
      "  /* wrap! */"
Type "gcb"
  before:
      "  box!"
  after:
      "  /********/"
      "  /* box! */"
      "  /********/"
Type "gco"
  before:
      "   func1();"
  after:
      "   func1()"
      "   // "  (now cursor is at the end and entered insert-mode)
Type "gcO"
  before:
      "   func1();"
  after:
      "   // "  (now cursor is at the end and entered insert-mode)
      "   func1();"