Issue #125: add a drupal-focused theme

themes/fishy-drupal/README.md

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+## fishy-drupal
+
+![fishy-drupal](https://raw.github.com/greggles/fishy-drupal/master/drups-fish-theme.png)
+
+#### Features
+
+* Shows the present working directory, abbreviated (default fish style)
+* Shows the active git branch, if any
+* Shows the active drush site alias, if any
+* Shows yello ✗ if the current git directory is "dirty"
+
+

themes/fishy-drupal/fish_prompt.fish

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+# name: fishy-drupal
+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 _drush_alias_name
+  set -l pid %self
+  if test -f "$TMPDIR/drush-env/drush-drupal-site-$pid"
+    echo (command cat $TMPDIR/drush-env/drush-drupal-site-$pid)
+  end
+end
+
+function fish_prompt
+  set -l cyan (set_color -o cyan)
+  set -l yellow (set_color -o yellow)
+  set -l red (set_color -o red)
+  set -l blue (set_color -o blue)
+  set -l normal (set_color normal)
+
+  set -l arrow "$blue➜ "
+  set -l cwd (set_color $fish_color_cwd)(prompt_pwd)
+
+  if [ (_git_branch_name) ]
+    set -l git_branch $red(_git_branch_name)
+    set git_info "$blue git:($git_branch$blue)"
+
+    if [ (_is_git_dirty) ]
+      set -l dirty "$yellow ✗"
+      set git_dirty "$dirty"
+    end
+  end
+
+  if [ (_drush_alias_name) ]
+    set -l drush_alias $blue(_drush_alias_name)
+    set drush_info "$green drush:($drush_alias$green)"
+  end
+
+  echo -n -s $arrow $cwd $git_info $drush_info $git_dirty $normal ' '
+end