.gitignore

# gitignore specify the blacklist by pattern
# won't affect tracked files, only applied to untracked

# * : match for a string without / letter and with length >= 0
#  !! But with only an asterisk "*", it may act like ** !!
# ? : match for a letter but not /
# [0-9]: match for a string withou / lettter adn with length = 0-9
# ** : match for a string can have / letter
# ! : negate
# / at the end of pattern : indicate it is a directory, or it may match a file with the same name

# Some rules:
# 1. Read from top to bottom, which means the priority of follower will be higher
#
# !! IMPORTANT!!
#
# 2. It is not possible to re-include a file if a parent directory of that file is excluded.
#    So assure its parent directory is in white list before want to re-include something
#    e.g. After /*, want to white list DIR/file2
#        !DIR  	    -- re-include parent directory
#	 DIR/* 	    -- exclude file1, file2, file3 .... in DIR
#	 !DIR/file2 -- re-include DIR/file2
#    	        	  
# 3. Use "/*" instead of "*"
#    when you use "*" or "/**" it will recursively exclude files
#    so it will exclude DIR, DIR/file1, DIR/file2, ...
#    and then you add a new pattern "!DIR"
#    but it still exclude DIR/file1, DIR/file2, ...
#    for git, it only cares about file but not directory, so DIR will not appear on untrack of git status
#    so use "/*" it will only exclude top level files and directories

/*
!init.el
!.gitignore
!my-lisp/
!README.md