install-files

#!/usr/bin/env python
from __future__ import print_function
import os
import sys

def main():
    import argparse
    ap = argparse.ArgumentParser()
    ap.add_argument('-n','--noaction', action='store_true',
                    help='Show commands but do not execute them')
    ap.add_argument('util', nargs='+',
                    help='Utility to install')
    args = ap.parse_args()
    #
    run = CmdRunner(verbose=True, noaction=args.noaction).run
    destdir = os.path.expanduser('~/bin')
    for utilspec in args.util:
        # Allow "alias:realprog"
        alias, _, util = utilspec.rpartition(':')
        link = os.path.relpath(os.path.join('.', util), destdir)
        dest = os.path.join(destdir, alias or util)
        if os.path.islink(dest):
            if os.readlink(dest) == link:
                # Already linked correctly
                continue
            run('rm %s' % dest,
                os.unlink, dest)
        elif os.path.isdir(dest):
            raise Exception('Cannot link %s: is a directory' % dest)
        elif os.path.exists(dest):
            run('rm %s' % dest,
                os.unlink, dest)
        run('ln -s %s %s' % (link, dest),
            os.symlink, link, dest)

class CmdRunner:
    def __init__(self, verbose=False, noaction=False):
        self.verbose = verbose
        self.noaction = noaction

    def run(self, shcmd, func, *args, **kw):
        if self.verbose or self.noaction:
            print(shcmd, file=sys.stderr)
        if not self.noaction:
            func(*args, **kw)

main()