Add a gitstatus theme.

themes/gitstatus/README.md

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+## GitStatus
+
+![GitStatus](https://github.com/godfat/fish_prompt-gitstatus/raw/master/gitstatus.png)
+
+#### Characteristics
+
+* Displays host information in the command prompt when connected via ssh.
+
+* Displays git information in the command prompt when inside a git repository.
+
+  - Shows current branch name.
+  - Shows * if working copy is dirty.
+  - Shows # if everything is staged.
+  - Shows no indicators if the working copy is clean.

themes/gitstatus/fish_prompt.fish

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+# name: GitStatus
+# Find latest version from: https://github.com/godfat/fish_prompt-gitstatus
+
+function _git_branch_name
+  echo (command git symbolic-ref HEAD ^/dev/null | sed -e 's|^refs/heads/||')
+end
+
+function _git_status_symbol
+  set -l git_status (git status --porcelain ^/dev/null)
+  if test -n "$git_status"
+    # Is there anyway to preserve newlines so we can reuse $git_status?
+    if git status --porcelain ^/dev/null | grep '^.[^ ]' >/dev/null
+      echo '*' # dirty
+    else
+      echo '#' # all staged
+    end
+  else
+    echo    '' # clean
+  end
+end
+
+function _remote_hostname
+  if test $SSH_CONNECTION
+    echo (whoami)@(hostname)
+  end
+end
+
+function fish_prompt
+  set -l cyan (set_color cyan)
+  set -l normal (set_color normal)
+  set -l cwd (set_color $fish_color_cwd)(prompt_pwd)
+
+  echo -n (_remote_hostname) \
+          $cwd $cyan(_git_status_symbol)(_git_branch_name)$normal'> '
+end