[split] Move trout theme to oh-my-fish/theme-trout

https://github.com/oh-my-fish/theme-trout

themes/trout/README.md

-A simple, but informative, prompt
-
-![example](https://raw.githubusercontent.com/phaedryx/trout/master/prompt.png)

themes/trout/fish_prompt.fish

-# name: trout
-
-function _git_branch_name
-  echo (command git symbolic-ref HEAD ^/dev/null | sed -e 's|^refs/heads/||')
-end
-
-function _is_git_dirty
-  echo (command git status -s --ignore-submodules=dirty ^/dev/null)
-end
-
-function _file_count
-  ls -1 | wc -l | sed 's/\ //g'
-end
-
-function fish_prompt
-  set -l last_status $status
-  set -l yellow (set_color yellow)
-  set -l red (set_color red)
-  set -l green (set_color green)
-  set -l magenta (set_color magenta)
-  set -l normal (set_color normal)
-
-  if [ (rbenv version-name) ]
-    set ruby_version (rbenv version-name)
-    set ruby_info "$red($ruby_version)$normal"
-  end
-
-  if [ (_git_branch_name) ]
-    set -l git_branch $magenta(_git_branch_name)
-    set git_info "$git_branch"
-
-    if [ (_is_git_dirty) ]
-      set git_info "$git_info$yellow*"
-    end
-
-    set git_info "$magenta($git_info$magenta)$normal"
-  end
-
-  if test $last_status = 0
-    set prompt " $green☆$normal "
-  else
-    set prompt " $red☆$normal "
-  end
-
-  echo -n -s $ruby_info $git_info $prompt
-end
-
-function fish_right_prompt
-  set -l blue (set_color blue)
-  set -l normal (set_color normal)
-
-  set -l path (pwd)
-  set -l count (_file_count)
-  set -l directory_info "($path ($count))"
-
-  set -l time (date '+%I:%M')
-  set -l time_info "$blue($time)$normal"
-
-  echo -n -s $directory_info $time_info
-end