add theme "ocean"

themes/ocean/README.md

+## ocean
+
+A fish theme with ocean in mind.
+
+
+Unicode-compatible fonts and terminals is required.
+I would recommend iTerm2 + Solarized Dark for Mac users.
+This theme is based loosely on [agnoster](https://gist.github.com/agnoster/3712874)
+
+#### Characteristics
+* Show a radioactive symbol when gain the root privileges (It's dangerous!)
+* Current python virtualenv (if applicable)
+* The anchor turn red if the previous command failed
+* Full path of current working directory
+* Git branch and dirty state (if applicable)
+* Show User @ Hostname if user is not default\_user
+> to turn on this feature, set these two lines in your config.fish
+> 	set -g theme display_user yes
+> 	set -g default_user your_default_username

themes/ocean/fish_prompt.fish

+# name: ocean
+# A fish theme with ocean in mind.
+
+
+## Set this options in your config.fish (if you want to)
+# set -g theme_display_user yes
+# set -g default_user default_username
+
+set __oceanfish_glyph_anchor \u2693
+set __oceanfish_glyph_flag \u2691
+set __oceanfish_glyph_radioactive \u2622
+
+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 fish_prompt
+    set -l last_status $status
+    set -l magenta (set_color magenta)
+    set -l red (set_color red)
+    set -l cyan (set_color cyan)
+    set -l white (set_color white)
+    set -l black (set_color black)
+    set -l bg_blue (set_color -b blue)
+    set -l bg_cyan (set_color -b cyan)
+    set -l bg_white (set_color -b white)
+    set -l bg_red (set_color -b red)
+    set -l bg_yellow (set_color -b yellow)
+    set -l normal (set_color normal)
+    set -l cwd $white(prompt_pwd)
+    set -l uid (id -u $USER)
+
+
+    # Show a yellow radioactive symbol for root privileges
+    if [ $uid -eq 0 ]
+        echo -n -s $bg_yellow $black " $__oceanfish_glyph_radioactive " $normal
+    end
+
+
+    # Display virtualenv name if in a virtualenv
+    if set -q VIRTUAL_ENV
+        echo -n -s $bg_cyan $black " " (basename "$VIRTUAL_ENV") " " $normal
+    end
+
+
+    # Show a nice anchor (turns red if previous command failed)
+    if test $last_status -ne 0
+        echo -n -s $bg_red $white " $__oceanfish_glyph_anchor "  $normal
+    else
+        echo -n -s $bg_blue $white " $__oceanfish_glyph_anchor " $normal
+    end
+
+    if [ "$theme_display_user" = "yes" ]
+        if [ "$USER" != "$default_user" -o -n "$SSH_CLIENT" ]
+            echo -n -s $bg_white $cyan " " (whoami) "@" (hostname -s) " " $normal
+        end
+    end
+
+    # Display current path
+    echo -n -s $bg_cyan " $cwd " $normal
+
+
+    # Show git branch and dirty state
+    if [ (_git_branch_name) ]
+        set -l git_branch (_git_branch_name)
+        if [ (_is_git_dirty) ]
+            echo -n -s $bg_white $magenta " $git_branch " $red "$__oceanfish_glyph_flag " $normal
+        else
+            echo -n -s $bg_white $magenta " $git_branch " $normal
+        end
+    end
+
+
+    # Terminate with a space
+    echo -n -s ' ' $normal
+end