My editorconfig (cross-platform, cross-application editor config file)

.editorconfig

; This file helps unify code style.
;
; Plugins are available for
; notepad++, emacs, vim, gedit,
; textmate, visual studio, and more.
;
; See http://editorconfig.org for details.

# top-most EditorConfig file
root = true

# For all projects
[*]
end_of_line = lf
trim_trailing_whitespace=true
insert_final_newline=true
charset=utf-8


# Default charset
[*.{js,py}]
charset = utf-8

# Python settings
[*.py]
indent_style = space
indent_size = 4
max_line_length=80

# Makefile settings
[Makefile]
indent_style = tab

# Indentation override for all JS under lib directory
[lib/**.js]
indent_style = space
indent_size = 2

# Matches the exact files either package.json or .travis.yml
[{package.json,.travis.yml}]
indent_style = space
indent_size = 2