Add Mac OS X compatibility for ranger feature of syl20bnr theme

themes/syl20bnr/README.md

@@ -13,6 +13,7 @@ Sylvain Benner personal, compact (hmmm...) yet complete (almost :-)) oh-my-fish
 	- [end](#end)
 	- [where](#where)
 - [Functions](#functions)
+- [Mac compatibility](#mac-compatibility)
 - [Cygwin compatibility](#cygwin-compatibility)
 
 ## Segments
@@ -101,12 +102,18 @@ This segment is displayed in the right prompt.
 Some functions come with the theme:
 - `toggle_right_prompt` will... toggle the right prompt! (alias: `trp`)
 
+## Mac compatibility
+
+In order to make this theme work correctly with all the features make sure to
+install the following packages via MacPorts or Homebrew:
+-`pstree` (used in ranger detection)
+
 ## Cygwin compatibility
 
 In order to make this theme work on [Cygwin][cygwin], make sure to install the following
 packages:
 - `bc` for `math` fish function
-- `psmisc` for `pstree`
+- `psmisc` for `pstree` (used in ranger detection)
 - `git` if you want to use the `git` segment.
 
 [git]: http://git-scm.com/

themes/syl20bnr/fish_prompt.fish

@@ -166,8 +166,19 @@ function fish_prompt -d "Write out the left prompt of the syl20bnr theme"
   # the current shell process and get back to the ranger process.
   set -l ps_end ">"
   # indicator for ranger parent process
-  set ranger ""
-  if pstree -p -l | grep "fish("(echo %self)")" | grep 'ranger([0-9]*)' > /dev/null
+  set -l ranger ""
+  set -l os (uname)
+  if test "$os" = "Darwin"
+    if pstree -s ranger | grep (echo %self) | grep -v grep > /dev/null
+      set ranger 1
+    end
+  end
+  if test "$os" = "Linux"
+    if pstree -p -l | grep "fish("(echo %self)")" | grep 'ranger([0-9]*)' > /dev/null
+      set ranger 1
+    end
+  end
+  if test -n "$ranger"
     set ps_end $ps_end$ps_end
   end
   # last status give the color of the right arrows at the end of the prompt