#!/bin/bash

msg() {
  echo >&2 -e "${1-}"
}

die() {
  local msg=$1
  local code=${2-1} # default exit status 1
  msg "$msg"
  exit "$code"
}

confirm() {
    # call with a prompt string or use a default
    read -r -p "${1:-Are you sure? [y/N]} " response
    case "$response" in
        [yY][eE][sS]|[yY]) 
            true
            ;;
        *)
            die "Aborted execution."
            ;;
    esac
}

FILE=~/.vimrc
if test -f "$FILE"; then
    msg "$FILE exists already. Continuing execution will override the file."
    confirm
fi

cat <<EOF >>~/.vimrc
" Don't try to be vi compatible
set nocompatible

" Turn on syntax highlighting
syntax on

" Enable global undo
set undofile
set undodir=~/.vim/undodir

" Blink cursor on error instead of beeping (grr)
set visualbell
set vb t_vb=

" Encoding
set encoding=utf-8

" Rendering
set ttyfast

" Last line
set showmode
set showcmd
set ruler " display cursor position in last line

" Searching
nnoremap / /\v
vnoremap / /\v
set hlsearch
set incsearch
set ignorecase
set smartcase
set showmatch
map <leader><space> :let @/=''<cr> " clear search

" Tabs
map <Leader>t :tabnew<CR>
map <Leader>[ :tabprevious<CR>
map <Leader>] :tabnext<CR>

" Markdown
map <Leader>md :set syntax=markdown<CR>

" No banner for file listing
let g:netrw_banner = 0
EOF

msg "Successfully written to $FILE."