diff --git a/themes/bobthefish/README.md b/themes/bobthefish/README.md
index 3f30f0e..07861ee 100644
--- a/themes/bobthefish/README.md
+++ b/themes/bobthefish/README.md
@@ -29,9 +29,9 @@ This theme is based loosely on [agnoster][agnoster].
      * You currently have superpowers ($)
  * User@Host (unless you're the default user)
  * Abbreviated parent directory
- * Current directory or Git project name
- * Current project's Git branch ( master) or detached head (➦ d0dfd9b)
- * Git status, via colors and flags:
+ * Current directory, or Git or Mercurial project name
+ * Current project's repo branch ( master) or detached head (➦ d0dfd9b)
+ * Git or Mercurial status, via colors and flags:
      * Dirty working directory (*)
      * Untracked files (…)
      * Staged changes (~)
@@ -39,6 +39,7 @@ This theme is based loosely on [agnoster][agnoster].
      * Unpulled commits (-)
      * Unpushed commits (+)
      * Unpulled *and* unpushed commits (±)
+     * _Note that not all of these have been implemented for hg yet :)_
  * Abbreviated project-relative path
 
 
diff --git a/themes/bobthefish/fish_prompt.fish b/themes/bobthefish/fish_prompt.fish
index 1aeebf9..32efc56 100644
--- a/themes/bobthefish/fish_prompt.fish
+++ b/themes/bobthefish/fish_prompt.fish
@@ -31,6 +31,7 @@ set __bobthefish_detached_glyph          \u27A6
 set __bobthefish_nonzero_exit_glyph      '! '
 set __bobthefish_superuser_glyph         '$ '
 set __bobthefish_bg_job_glyph            '% '
+set __bobthefish_hg_glyph                \u263F
 
 # Python glyphs
 set __bobthefish_superscript_glyph       \u00B9 \u00B2 \u00B3
@@ -68,7 +69,11 @@ set __bobthefish_lt_blue    326D9E
 # ===========================
 
 function __bobthefish_in_git -d 'Check whether pwd is inside a git repo'
-  command git rev-parse --is-inside-work-tree >/dev/null 2>&1
+  command which git > /dev/null 2>&1; and command git rev-parse --is-inside-work-tree >/dev/null 2>&1
+end
+
+function __bobthefish_in_hg -d 'Check whether pwd is inside a hg repo'
+  command which hg > /dev/null 2>&1; and command hg stat > /dev/null 2>&1
 end
 
 function __bobthefish_git_branch -d 'Get the current git branch (or commitish)'
@@ -80,17 +85,26 @@ function __bobthefish_git_branch -d 'Get the current git branch (or commitish)'
   echo $ref | sed  "s-refs/heads/-$__bobthefish_branch_glyph -"
 end
 
+function __bobthefish_hg_branch -d 'Get the current hg branch'
+  set -l branch (hg branch ^/dev/null)
+  set -l book " @ "(hg book | grep \* | cut -d\  -f3)
+  echo "$__bobthefish_branch_glyph $branch$book"
+end
+
 function __bobthefish_pretty_parent -d 'Print a parent directory, shortened to fit the prompt'
   echo -n (dirname $argv[1]) | sed -e 's|/private||' -e "s|^$HOME|~|" -e 's-/\(\.\{0,1\}[^/]\)\([^/]*\)-/\1-g' -e 's|/$||'
 end
 
-function __bobthefish_project_dir -d 'Print the current git project base directory'
+function __bobthefish_git_project_dir -d 'Print the current git project base directory'
   command git rev-parse --show-toplevel 2>/dev/null
 end
 
+function __bobthefish_hg_project_dir -d 'Print the current hg project base directory'
+  command hg root 2>/dev/null
+end
+
 function __bobthefish_project_pwd -d 'Print the working directory relative to project root'
-  set -l base_dir (__bobthefish_project_dir)
-  echo "$PWD" | sed -e "s*$base_dir**g" -e 's*^/**'
+  echo "$PWD" | sed -e "s*$argv[1]**g" -e 's*^/**'
 end
 
 
@@ -167,7 +181,7 @@ function __bobthefish_prompt_status -d 'Display symbols for a non zero exit stat
   set -l bg_jobs
 
   # Last exit was nonzero
-  if [ $RETVAL -ne 0 ]
+  if [ $status -ne 0 ]
     set nonzero $__bobthefish_nonzero_exit_glyph
   end
 
@@ -214,6 +228,41 @@ function __bobthefish_prompt_user -d 'Display actual user if different from $def
   end
 end
 
+function __bobthefish_prompt_hg -d 'Display the actual hg state'
+  set -l dirty   (command hg stat; or echo -n '*')
+
+  set -l flags "$dirty"
+  test "$flags"; and set flags ""
+
+  set -l flag_bg $__bobthefish_lt_green
+  set -l flag_fg $__bobthefish_dk_green
+  if test "$dirty"
+    set flag_bg $__bobthefish_med_red
+    set flag_fg fff
+  end
+
+  __bobthefish_path_segment (__bobthefish_hg_project_dir)
+
+  __bobthefish_start_segment $flag_bg $flag_fg
+  echo -n -s $__bobthefish_hg_glyph ' '
+
+  __bobthefish_start_segment $flag_bg $flag_fg
+  set_color $flag_fg --bold
+  echo -n -s (__bobthefish_hg_branch) $flags ' '
+  set_color normal
+
+  set -l project_pwd  (__bobthefish_project_pwd (__bobthefish_hg_project_dir))
+  if test "$project_pwd"
+    if test -w "$PWD"
+      __bobthefish_start_segment 333 999
+    else
+      __bobthefish_start_segment $__bobthefish_med_red $__bobthefish_lt_red
+    end
+
+    echo -n -s $project_pwd ' '
+  end
+end
+
 # TODO: clean up the fugly $ahead business
 function __bobthefish_prompt_git -d 'Display the actual git state'
   set -l dirty   (command git diff --no-ext-diff --quiet --exit-code; or echo -n '*')
@@ -239,14 +288,14 @@ function __bobthefish_prompt_git -d 'Display the actual git state'
     end
   end
 
-  __bobthefish_path_segment (__bobthefish_project_dir)
+  __bobthefish_path_segment (__bobthefish_git_project_dir)
 
   __bobthefish_start_segment $flag_bg $flag_fg
   set_color $flag_fg --bold
   echo -n -s (__bobthefish_git_branch) $flags ' '
   set_color normal
 
-  set -l project_pwd  (__bobthefish_project_pwd)
+  set -l project_pwd  (__bobthefish_project_pwd (__bobthefish_git_project_dir))
   if test "$project_pwd"
     if test -w "$PWD"
       __bobthefish_start_segment 333 999
@@ -296,14 +345,15 @@ end
 # ===========================
 
 function fish_prompt -d 'bobthefish, a fish theme optimized for awesome'
-  set -g RETVAL $status
   __bobthefish_prompt_status
   __bobthefish_prompt_user
   if __bobthefish_in_virtualfish_virtualenv
     __bobthefish_prompt_virtualfish
   end
-  if __bobthefish_in_git
-    __bobthefish_prompt_git
+  if __bobthefish_in_git       # TODO: do this right.
+    __bobthefish_prompt_git    # if something is in both git and hg, check the length of
+  else if __bobthefish_in_hg   # __bobthefish_git_project_dir vs __bobthefish_hg_project_dir
+    __bobthefish_prompt_hg     # and pick the longer of the two.
   else
     __bobthefish_prompt_dir
   end