A script to truncate the_silver_searcher's output in Vim

agtrunc

#!/usr/bin/env python
'''Truncates matches from ag

Place this script somewhere in your $PATH, like ~/bin and pipe ag into it.

Vim could be setup like this:
    if executable('ag')
        set grepprg=ag\ --vimgrep\ -w\ $*

        if executable('agtrunc')
            set grepprg+=\ \\\|\ agtrunc
        endif

        set grepformat=%f:%l:%c:%m

        command! -nargs=+ Ag exec 'silent! grep! <args>' | copen | exec 'silent /<args>' | redraw!
        nnoremap <leader>a :Ag <c-r>=expand('<cword>')<CR><CR>
    endif
'''
import sys

MAX_CHARS = 80


def truncline(line):
    filename, lineno, col, text = line.split(':', 3)
    if len(text) > MAX_CHARS:
        cs = max(0, int(col) - 10)
        ce = cs + MAX_CHARS
        text = text[cs:ce]
    print(':'.join((filename, lineno, col, text.strip('\r\n'))))


if __name__ == '__main__':
    for line in sys.stdin.readlines():
        truncline(line)