Normalize open across Linux, macOS, and Windows

This makes `o` work cross-platform as well.

Also, delete some unused stuff from `.functions`.

Author: mathiasbynens

.functions

@@ -102,30 +102,11 @@ function gz() {
 	printf "gzip: %d bytes (%2.2f%%)\n" "$gzipsize" "$ratio";
 }
 
-# Syntax-highlight JSON strings or files
-# Usage: `json '{"foo":42}'` or `echo '{"foo":42}' | json`
-function json() {
-	if [ -t 0 ]; then # argument
-		python -mjson.tool <<< "$*" | pygmentize -l javascript;
-	else # pipe
-		python -mjson.tool | pygmentize -l javascript;
-	fi;
-}
-
 # Run `dig` and display the most useful info
 function digga() {
 	dig +nocmd "$1" any +multiline +noall +answer;
 }
 
-# UTF-8-encode a string of Unicode symbols
-function escape() {
-	printf "\\\x%s" $(printf "$@" | xxd -p -c1 -u);
-	# print a newline unless we’re piping the output to another program
-	if [ -t 1 ]; then
-		echo ""; # newline
-	fi;
-}
-
 # Show all the names (CNs and SANs) listed in the SSL certificate
 # for a given domain
 function getcertnames() {
@@ -160,25 +141,16 @@ function getcertnames() {
 	fi;
 }
 
-# `s` with no arguments opens the current directory in Sublime Text, otherwise
-# opens the given location
-function s() {
-	if [ $# -eq 0 ]; then
-		subl .;
-	else
-		subl "$@";
-	fi;
-}
-
-# `v` with no arguments opens the current directory in Vim, otherwise opens the
-# given location
-function v() {
-	if [ $# -eq 0 ]; then
-		vim .;
+# Normalize `open` across Linux, macOS, and Windows.
+# This is needed to make the `o` function (see below) cross-platform.
+if [ ! $(uname -s) = 'Darwin' ]; then
+	if grep -q Microsoft /proc/version; then
+		# Ubuntu on Windows using the Linux subsystem
+		alias open='explorer.exe';
 	else
-		vim "$@";
-	fi;
-}
+		alias open='xdg-open';
+	fi
+fi
 
 # `o` with no arguments opens the current directory, otherwise opens the given
 # location