osx plugin: Updated description implementation, improved argument checking

plugins/osx/cdf.fish

 # cd to the current Finder directory
 
-function cdf
-	if count $argv >/dev/null
-    switch $argv[1]
-      case -d --description
-        echo "cd to the current Finder directory"
-        return 0
-    end
-  end
+function cdf -d "cd to the current Finder directory"
   cd (pfd)
 end
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plugins/osx/itunes.fish

 # Play, pause etc. iTunes
 
-function itunes
-  if count $argv >/dev/null
+function itunes -d "Play, pause etc. iTunes. Use -h or --help for a more detailed description."
+  if [ (count $argv) -gt 0 ]
     set -l opt $argv[1]
     switch $opt
-      case -d --description
-        echo "Play, pause etc. iTunes. Use -h or --help for a more detailed description."
-        return 0
       case launch play pause stop rewind resume quit      
       case mute
         set opt "set mute to true"      

plugins/osx/manp.fish

 # Open a specified man page in Preview
 
-function manp
-  if count $argv >/dev/null
-    switch $argv[1]
-      case -d --description
-        echo "Open a specified man page in Preview"
-        return 0
-    end
-  end
+function manp -d "Open a specified man page in Preview"
   man -t $argv | open -f -a Preview
 end
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plugins/osx/pfd.fish

 # Return the path of the frontmost Finder window
 
-function pfd
-  if count $argv >/dev/null
-    switch $argv[1]
-      case -d --description
-        echo "Return the path of the frontmost Finder window"
-        return 0
-    end
-  end
+function pfd -d "Return the path of the frontmost Finder window"
   osascript 2>/dev/null -e '
       tell application "Finder"
         return POSIX path of (target of window 1 as alias)

plugins/osx/pfs.fish

 # Return the path of the frontmost Finder window
 
-function pfs
-  if count $argv >/dev/null
-    switch $argv[1]
-      case -d --description
-        echo "Return the path of the frontmost Finder window"
-        return 0
-    end
-  end
+function pfs -d "Return the path of the frontmost Finder window"
   osascript 2>/dev/null -e '
       set output to ""
       tell application "Finder" to set the_selection to selection

plugins/osx/pushdf.fish

 # pushd to the current Finder directory
 
-function pushdf
-  if count $argv >/dev/null
-    switch $argv[1]
-      case -d --description
-        echo "pushd to the current Finder directory"
-        return 0
-    end
-  end
+function pushdf -d "pushd to the current Finder directory"
   pushd (pfd)
 end
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plugins/osx/ql.fish

 # Quick Look a specified file
 
-function ql
-  if count $argv >/dev/null
-    switch $argv[1]
-      case -d --description
-        echo "Quick Look a specified file"
-        return 0
-    end
-  end
-  if count $argv > 0
+function ql -d "Quick Look a specified file"
+  if [ (count $argv) -gt 0 ]
     qlmanage >/dev/null ^/dev/null -p Applications/ &
+  else
+    echo "No file or folder as argument given"
   end
 end
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plugins/osx/tab.fish

 # Open the current directory in a new tab
-function tab
-  if count $argv >/dev/null
-    switch $argv[1]
-      case -d --description
-        echo "Open the current directory in a new tab"
-        return 0
-    end
-  end
+function tab -d "Open the current directory in a new tab"
   osascript 2>/dev/null -e '
       tell application "System Events"
         tell process "Terminal" to keystroke "t" using command down

plugins/osx/trash.fish

 # Move a specified file to the Trash
 
-function trash
-  if count $argv >/dev/null
-    switch $argv[1]
-      case -d --description
-        echo "Move a specified file to the Trash"
-        return 0
-    end
-  end
-  set -l trash_dir "$HOME/.Trash"
-  for item in $argv
-    if test -e $item
-      set -l item_name (basename $item)
-      if test -e "$trash_dir/$item_name"
-        set -l current_time (date "+%H.%M.%S")
-        mv -f "$item" "$trash_dir/$item_name $current_time"
-      else
-        mv -f "$item" "$trash_dir/"
+function trash -d "Move a specified file to the Trash"
+  if [ (count $argv) -gt 0 ]
+    set -l trash_dir "$HOME/.Trash"
+    for item in $argv
+      if test -e $item
+        set -l item_name (basename $item)
+        if test -e "$trash_dir/$item_name"
+          set -l current_time (date "+%H.%M.%S")
+          mv -f "$item" "$trash_dir/$item_name $current_time"
+        else
+          mv -f "$item" "$trash_dir/"
+        end
       end
     end
+  else
+    echo "No file(s) given to delete"
   end
 end
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