Fix WSL check for WSL 2 and simplify nohup in open_command

WSL 2 changes the output of `uname -r`. For instance,

  WSL 1: 4.4.0-18980-Microsoft
  WSL 2: 4.19.67-microsoft-standard

Since WSL 2 lowercases the M, we can match for the rest of the string
which remains lowercase throughout both versions. Another option would
be to match for both upper- and lower-case Ms, like that:

  $(uname -r) = *[Mm]icrosoft*

Fixed use of nohup in open_command where it was only necessary for
xdg-open (and actually harmful for cmd.exe in WSL 2). The current logic
is simpler and more future-proof.

lib/functions.zsh

@@ -21,7 +21,7 @@ function open_command() {
   case "$OSTYPE" in
     darwin*)  open_cmd='open' ;;
     cygwin*)  open_cmd='cygstart' ;;
-    linux*)   ! [[ $(uname -a) =~ "Microsoft" ]] && open_cmd='xdg-open' || {
+    linux*)   [[ "$(uname -r)" != *icrosoft* ]] && open_cmd='nohup xdg-open' || {
                 open_cmd='cmd.exe /c start ""'
                 [[ -e "$1" ]] && { 1="$(wslpath -w "${1:a}")" || return 1 }
               } ;;
@@ -31,12 +31,7 @@ function open_command() {
               ;;
   esac
 
-  # don't use nohup on OSX
-  if [[ "$OSTYPE" == darwin* ]]; then
   ${=open_cmd} "$@" &>/dev/null
-  else
-    nohup ${=open_cmd} "$@" &>/dev/null
-  fi
 }
 
 #

plugins/sublime/sublime.plugin.zsh

@@ -15,7 +15,7 @@ alias stn=create_project
   declare -a _sublime_paths
 
   if [[ "$OSTYPE" == linux* ]]; then
-    if [[ "$(uname -r)" = *Microsoft* ]]; then
+    if [[ "$(uname -r)" = *icrosoft* ]]; then
       _sublime_paths=(
         "$(wslpath -u 'C:\Program Files\Sublime Text 3\subl.exe')"
         "$(wslpath -u 'C:\Program Files\Sublime Text 2\subl.exe')"