This VIM macro saves my life

.vimrc

" Put your text cursor on an expression you want to search in your project
" and type :Gr
" It will open a buffer on the left with every references of this expression
" in your current folder (recursively).

python << EOF

import vim

def set_register(reg, value):
    vim.command("let @%s='%s'" % (reg, value.replace("'","''")))

def get_register(reg):
    return vim.eval("@" + reg)

def get_word_under_cursor():
    set_register("g", "")
    vim.command("normal viw\"gy")
    return get_register("g")

def grep_word():
    word = get_word_under_cursor()
    vim.command("vnew")
    vim.command("r!grep -R \"%s\" * | grep \"%s\"" % (word, word, ))
    vim.command("/%s" % (word, ))
    vim.command("normal gg0")

vim.command("command Gr py grep_word()")
EOF