vim option: paste

Setting paste

• disables mappings in insert mode and command line mode.
• disables abbreviations
• the options autoindent, expandtab, revins, ruler, showmatch, smartindent, smarttab are reset
• the options softabstop, textwidth and wrapmargin are set to 0
• the effects of the options cindent, indentexpr and lisp (but these options keep their values)

Because abbreviations and mappings are disabled, the special string-option pastetoggle allows to define a key sequence that still switches back to nopaste in paste mode.