add python install script

install.py

@@ -0,0 +1,77 @@
+""" cross platform installation script
+"""
+import subprocess
+import os
+import urllib
+
+from os.path import expanduser, join
+from shutil import which
+
+home = expanduser("~") 
+app_name = 'dotfile'
+APP_PATH = join(home, '.' + app_name)
+REPO_URL = 'https://github.com/Donaldttt/' + app_name
+REPO_BRANCH = 'dev'
+VIM_RTPATH = join(home, '.vim')
+
+def exist(app):
+    return which(app) is not None
+
+def program_must_exist(app):
+    if not exist(app):
+        fatal_error(app, "must be installed to continue")
+
+def fatal_error(msg):
+    print('Error:', msg)
+    exit()
+
+def msg(msg):
+    print(msg)
+
+def execute(cmd, cwd=None):
+    out = subprocess.check_output(
+        cmd,
+        stderr=subprocess.STDOUT,
+        shell=True,
+        cwd=None
+    )
+    print(out)
+
+def sync_repo(repo_path, repo_url, repo_branch, repo_name):
+    if not os.path.exists(repo_path):
+        msg('Trying to clone ' + repo_name)
+        cmd = "git clone -b {} {} {}".format(repo_branch, repo_url, repo_path)
+        execute(cmd)
+    else:
+        msg('Trying to update ' + repo_name)
+        cmd = "git pull origin {}".format(repo_branch)
+        execute(cmd, cwd=APP_PATH)
+
+def setup_vimplug():
+    urllib.URLopener().retrieve("https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim", VIM_RTPATH + "\\autoload\\plug.vim")
+    print("Please execute :PlugInstall in vim")
+
+def setup_nvim():
+    if exist('nvim'):
+        nvim_dir = home + '\\AppData\\Local\\nvim\\'
+        nvim_config = nvim_dir + 'init.vim'
+        if not os.path.isdir(nvim_dir):
+            os.mkdir(nvim_dir)
+        msg('Setting up neovim config')
+        with open(nvim_config, 'w') as f:
+            f.write('''set runtimepath^=~/.vim runtimepath+=~/.vim/after
+            let &packpath=&runtimepath
+            source ~/.vimrc''')
+
+def setup_vim():
+    if not exist('vim') and not exist('nvim'):
+        fatal_error('Error: vim or nvim has to be installed.')
+    program_must_exist('git')
+    sync_repo(APP_PATH, REPO_URL, REPO_BRANCH, app_name)
+    os.symlink(join(APP_PATH, '.vimrc'), join(home, '.vimrc'))
+    os.symlink(join(APP_PATH, '.vimrc.bundles'), join(home, '.vimrc.bundles'))
+    setup_nvim()
+    setup_vimplug()
+    msg("Done!")
+
+setup_vim()