diff --git a/README.md b/README.md
index 05a22de..776d104 100644
--- a/README.md
+++ b/README.md
@@ -82,6 +82,7 @@ set -g theme_display_docker_machine no
 set -g theme_display_k8s_context yes
 set -g theme_display_hg yes
 set -g theme_display_virtualenv no
+set -g theme_display_nix no
 set -g theme_display_ruby no
 set -g theme_display_nvm yes
 set -g theme_display_user ssh
@@ -94,6 +95,7 @@ set -g theme_title_display_path no
 set -g theme_title_display_user yes
 set -g theme_title_use_abbreviated_path no
 set -g theme_date_format "+%a %H:%M"
+set -g theme_date_timezone America/Los_Angeles
 set -g theme_avoid_ambiguous_glyphs yes
 set -g theme_powerline_fonts no
 set -g theme_nerd_fonts yes
@@ -121,6 +123,7 @@ set -g theme_newline_prompt '$ '
 - `theme_display_vagrant`. This feature is disabled by default, use `yes` to display Vagrant status in your prompt. Please note that only the VirtualBox and VMWare providers are supported.
 - `theme_display_vi`. By default the vi mode indicator will be shown if vi or hybrid key bindings are enabled. Use `no` to hide the indicator, or `yes` to show the indicator.
 - `theme_display_k8s_context`. This feature is disabled by default. Use `yes` to show the current kubernetes context (`> kubectl config current-context`).
+- `theme_display_k8s_namespace`. This feature is disabled by default. Use `yes` to show the current kubernetes namespace.
 - `theme_display_user`. If set to `yes`, display username always, if set to `ssh`, only when an SSH-Session is detected, if set to no, never.
 - `theme_display_hostname`. Same behaviour as `theme_display_user`.
 - `theme_display_sudo_user`. If set to `yes`, displays the sudo-username in a root shell. For example, when calling `sudo -s` and having this option set to `yes`, the username of the user, who called `sudo -s`, will be displayed.
@@ -140,6 +143,7 @@ set -g theme_newline_prompt '$ '
 | ![solarized][solarized] | ![solarized-light][solarized-light] |
 | ![base16][base16]       | ![base16-light][base16-light]       |
 | ![zenburn][zenburn]     | ![terminal-dark][terminal-dark]     |
+| ![nord][nord]           |                                     |
 
 You can use the function `bobthefish_display_colors` to preview the prompts in
 any color scheme.
@@ -156,6 +160,7 @@ one of the following options to change the prompt colors.
 - `zenburn`. An adaptation of Zenburn.
 - `gruvbox`. An adaptation of gruvbox.
 - `dracula`. An adaptation of dracula.
+- `nord`. An adaptation of nord.
 
 Some of these may not look right if your terminal does not support 24 bit color,
 in which case you can try one of the `terminal` schemes (below). However, if
@@ -234,3 +239,4 @@ end
 [base16-light]:    https://cloud.githubusercontent.com/assets/53660/16141579/02f7245e-3412-11e6-97c6-5f3cecffb73c.png "base16-light"
 [zenburn]:         https://cloud.githubusercontent.com/assets/53660/16141580/06229dd4-3412-11e6-84aa-a48de127b6da.png "zenburn"
 [terminal-dark]:   https://cloud.githubusercontent.com/assets/53660/16141583/0b3e8eea-3412-11e6-8068-617c5371f6ea.png "terminal-dark"
+[nord]:            https://user-images.githubusercontent.com/39213657/72811435-f64ca800-3c5f-11ea-8711-dcce8cfc50fb.png "nord"
diff --git a/fish_mode_prompt.fish b/fish_mode_prompt.fish
index 304b705..efb3c62 100644
--- a/fish_mode_prompt.fish
+++ b/fish_mode_prompt.fish
@@ -1,9 +1,42 @@
-# This is handled inside fish_mode_prompt (see `__bobthefish_prompt_vi`)
+# Display the current binding mode... if it's vi or vi-like.
 #
-# If you want to override this with your own mode prompt, disable bobthefish's
-# built-in mode prompt in your fish config:
+# To always show the binding mode (regardless of current bindings):
+#     set -g theme_display_vi yes
 #
+# To never show:
 #     set -g theme_display_vi no
 
-function fish_mode_prompt
+function fish_mode_prompt -d 'bobthefish-optimized fish mode indicator'
+    [ "$theme_display_vi" != 'no' ]
+    or return
+
+    [ "$fish_key_bindings" = 'fish_vi_key_bindings' \
+        -o "$fish_key_bindings" = 'hybrid_bindings' \
+        -o "$fish_key_bindings" = 'fish_hybrid_key_bindings' \
+        -o "$theme_display_vi" = 'yes' ]
+    or return
+
+    __bobthefish_colors $theme_color_scheme
+
+    type -q bobthefish_colors
+    and bobthefish_colors
+
+    set_color normal # clear out anything bold or underline...
+
+    switch $fish_bind_mode
+        case default
+            set_color -b $color_vi_mode_default
+            echo -n ' N '
+        case insert
+            set_color -b $color_vi_mode_insert
+            echo -n ' I '
+        case replace_one replace-one
+            set_color -b $color_vi_mode_insert
+            echo -n ' R '
+        case visual
+            set_color -b $color_vi_mode_visual
+            echo -n ' V '
+    end
+
+    set_color normal
 end
diff --git a/fish_prompt.fish b/fish_prompt.fish
index e2a47d1..40198e0 100644
--- a/fish_prompt.fish
+++ b/fish_prompt.fish
@@ -28,8 +28,10 @@
 #     set -g theme_display_vagrant yes
 #     set -g theme_display_docker_machine no
 #     set -g theme_display_k8s_context yes
+#     set -g theme_display_k8s_namespace no
 #     set -g theme_display_hg yes
 #     set -g theme_display_virtualenv no
+#     set -g theme_display_nix no
 #     set -g theme_display_ruby no
 #     set -g theme_display_user ssh
 #     set -g theme_display_hostname ssh
@@ -66,6 +68,13 @@ function __bobthefish_pwd -d 'Get a normalized $PWD'
     or echo $PWD
 end
 
+# Note that for fish < 3.0 this falls back to unescaped, rather than trying to do something clever /shrug
+# After we drop support for older fishies, we can inline this without the fallback.
+function __bobthefish_escape_regex -a str -d 'A backwards-compatible `string escape --style=regex` implementation'
+    string escape --style=regex "$str" 2>/dev/null
+    or echo "$str"
+end
+
 function __bobthefish_git_branch -S -d 'Get the current git branch (or commitish)'
     set -l ref (command git symbolic-ref HEAD 2>/dev/null)
     and begin
@@ -102,7 +111,7 @@ function __bobthefish_pretty_parent -S -a child_dir -d 'Print a parent directory
 
     # Replace $HOME with ~
     set -l real_home ~
-    set -l parent_dir (string replace -r '^'"$real_home"'($|/)' '~$1' (__bobthefish_dirname $child_dir))
+    set -l parent_dir (string replace -r '^'(__bobthefish_escape_regex "$real_home")'($|/)' '~$1' (__bobthefish_dirname $child_dir))
 
     # Must check whether `$parent_dir = /` if using native dirname
     if [ -z "$parent_dir" ]
@@ -230,7 +239,7 @@ function __bobthefish_project_pwd -S -a project_root_dir -a real_pwd -d 'Print t
     set -q theme_project_dir_length
     or set -l theme_project_dir_length 0
 
-    set -l project_dir (string replace -r '^'"$project_root_dir"'($|/)' '' $real_pwd)
+    set -l project_dir (string replace -r '^'(__bobthefish_escape_regex "$project_root_dir")'($|/)' '' $real_pwd)
 
     if [ $theme_project_dir_length -eq 0 ]
         echo -n $project_dir
@@ -384,7 +393,7 @@ function __bobthefish_finish_segments -S -d 'Close open prompt segments'
 
         if set -q theme_newline_prompt
             echo -ens "$theme_newline_prompt"
-        else if [ "$theme_powerline_fonts" = "no" ]
+        else if [ "$theme_powerline_fonts" = "no" -a "$theme_nerd_fonts" != "yes" ]
             echo -ns '> '
         else
             echo -ns "$right_arrow_glyph "
@@ -399,7 +408,7 @@ end
 
 
 # ==============================
-# Status and input mode segments
+# Status segment
 # ==============================
 
 function __bobthefish_prompt_currentos -S -d 'Display current OS version'
@@ -532,32 +541,6 @@ function __bobthefish_prompt_status -S -a last_status -d 'Display flags for a no
     end
 end
 
-function __bobthefish_prompt_vi -S -d 'Display vi mode'
-    [ "$theme_display_vi" != 'no' ]
-    or return
-
-    [ "$fish_key_bindings" = 'fish_vi_key_bindings' \
-        -o "$fish_key_bindings" = 'hybrid_bindings' \
-        -o "$fish_key_bindings" = 'fish_hybrid_key_bindings' \
-        -o "$theme_display_vi" = 'yes' ]
-    or return
-
-    switch $fish_bind_mode
-        case default
-            __bobthefish_start_segment $color_vi_mode_default
-            echo -n 'N '
-        case insert
-            __bobthefish_start_segment $color_vi_mode_insert
-            echo -n 'I '
-        case replace_one replace-one
-            __bobthefish_start_segment $color_vi_mode_insert
-            echo -n 'R '
-        case visual
-            __bobthefish_start_segment $color_vi_mode_visual
-            echo -n 'V '
-    end
-end
-
 
 # ==============================
 # Container and VM segments
@@ -694,7 +677,12 @@ function __bobthefish_prompt_k8s_context -S -d 'Show current Kubernetes context'
     set -l context (__bobthefish_k8s_context)
     or return
 
-    set -l namespace (__bobthefish_k8s_namespace)
+    [ "$theme_display_k8s_namespace" = 'yes' ]
+    and set -l namespace (__bobthefish_k8s_namespace)
+
+    [ -z $context -o "$context" = 'default' ]
+    and [ -z $namespace -o "$namespace" = 'default' ]
+    and return
 
     set -l segment $k8s_glyph " " $context
     [ -n "$namespace" ]
@@ -869,11 +857,13 @@ function __bobthefish_prompt_rubies -S -d 'Display current Ruby information'
     else if type -q chruby # chruby is implemented as a function, so omitting the -f is intentional
         set ruby_version $RUBY_VERSION
     else if type -fq asdf
-        asdf current ruby 2>/dev/null | read -l asdf_ruby_version asdf_provenance
+        set -l asdf_current_ruby (asdf current ruby 2>/dev/null)
         or return
 
+        echo "$asdf_current_ruby" | read -l asdf_ruby_version asdf_provenance
+
         # If asdf changes their ruby version provenance format, update this to match
-        [ "$asdf_provenance" = "(set by $HOME/.tool-versions)" ]
+        [ (string trim -- "$asdf_provenance") = "(set by $HOME/.tool-versions)" ]
         and return
 
         set ruby_version $asdf_ruby_version
@@ -949,6 +939,15 @@ function __bobthefish_prompt_nvm -S -d 'Display current node version through NVM
     set_color normal
 end
 
+function __bobthefish_prompt_nix -S -d 'Display current nix environment'
+    [ "$theme_display_nix" = 'no' -o -z "$IN_NIX_SHELL" ]
+    and return
+
+    __bobthefish_start_segment $color_nix
+    echo -ns $nix_glyph $IN_NIX_SHELL ' '
+
+    set_color normal
+end
 
 # ==============================
 # VCS segments
@@ -1138,17 +1137,17 @@ function fish_prompt -d 'bobthefish, a fish theme optimized for awesome'
     # Status flags and input mode
     __bobthefish_prompt_currentos
     __bobthefish_prompt_status $last_status
-    __bobthefish_prompt_vi
+
+    # User / hostname info
+    __bobthefish_prompt_user
 
     # Containers and VMs
     __bobthefish_prompt_vagrant
     __bobthefish_prompt_docker
     __bobthefish_prompt_k8s_context
 
-    # User / hostname info
-    __bobthefish_prompt_user
-
     # Virtual environments
+    __bobthefish_prompt_nix
     __bobthefish_prompt_desk
     __bobthefish_prompt_rubies
     __bobthefish_prompt_virtualfish
diff --git a/fish_right_prompt.fish b/fish_right_prompt.fish
index d0bb3b1..bd6ee94 100644
--- a/fish_right_prompt.fish
+++ b/fish_right_prompt.fish
@@ -1,5 +1,6 @@
 # You can override some default right prompt options in your config.fish:
 #     set -g theme_date_format "+%a %H:%M"
+#     set -g theme_date_timezone America/Los_Angeles
 
 function __bobthefish_cmd_duration -S -d 'Show command duration'
     [ "$theme_display_cmd_duration" = "no" ]
@@ -62,12 +63,12 @@ function __bobthefish_timestamp -S -d 'Show the current timestamp'
     or set -l theme_date_format "+%c"
 
     echo -n ' '
-    date $theme_date_format
+    env TZ="$theme_date_timezone" date $theme_date_format
 end
 
 function fish_right_prompt -d 'bobthefish is all about the right prompt'
     set -l __bobthefish_left_arrow_glyph \uE0B3
-    if [ "$theme_powerline_fonts" = "no" ]
+    if [ "$theme_powerline_fonts" = "no" -a "$theme_nerd_fonts" != "yes" ]
         set __bobthefish_left_arrow_glyph '<'
     end
 
diff --git a/functions/__bobthefish_colors.fish b/functions/__bobthefish_colors.fish
index 793c70a..c2c97d6 100644
--- a/functions/__bobthefish_colors.fish
+++ b/functions/__bobthefish_colors.fish
@@ -36,7 +36,9 @@ function __bobthefish_colors -S -a color_scheme -d 'Define colors used by bobthe
       set -x color_virtualgo                brblue $colorfg --bold
       set -x color_desk                     brblue $colorfg --bold
       set -x color_currentos                green $colorfg --bold
-    case 'terminal-light*'
+      set -x color_nix                      brblue $colorfg --bold
+
+case 'terminal-light*'
       set -l colorfg white
       [ "$color_scheme" = 'terminal-light-black' ]; and set colorfg black
       set -x color_initial_segment_exit     black red --bold
@@ -68,6 +70,7 @@ function __bobthefish_colors -S -a color_scheme -d 'Define colors used by bobthe
       set -x color_virtualgo                brblue $colorfg --bold
       set -x color_desk                     brblue $colorfg --bold
       set -x color_currentos                green $colorfg --bold
+      set -x color_nix                      brblue $colorfg --bold
 
     case 'terminal2' 'terminal2-dark*'
       set -l colorfg black
@@ -101,6 +104,7 @@ function __bobthefish_colors -S -a color_scheme -d 'Define colors used by bobthe
       set -x color_virtualgo                brblue $colorfg --bold
       set -x color_desk                     brblue $colorfg --bold
       set -x color_currentos                green $colorfg --bold
+      set -x color_nix                      brblue $colorfg --bold
 
     case 'terminal2-light*'
       set -l colorfg white
@@ -134,6 +138,7 @@ function __bobthefish_colors -S -a color_scheme -d 'Define colors used by bobthe
       set -x color_virtualgo                brblue $colorfg --bold
       set -x color_desk                     brblue $colorfg --bold
       set -x color_currentos                green $colorfg --bold
+      set -x color_nix                      brblue $colorfg --bold
 
     case 'zenburn'
       set -l grey   333333 # a bit darker than normal zenburn grey
@@ -173,6 +178,7 @@ function __bobthefish_colors -S -a color_scheme -d 'Define colors used by bobthe
       set -x color_virtualgo                $blue $grey --bold
       set -x color_desk                     $blue $grey --bold
       set -x color_currentos                $green $white --bold
+      set -x color_nix                      $blue $grey --bold
 
     case 'base16-light'
       set -l base00 181818
@@ -223,6 +229,7 @@ function __bobthefish_colors -S -a color_scheme -d 'Define colors used by bobthe
       set -x color_virtualgo                $base0D $colorfg --bold
       set -x color_desk                     $base0D $colorfg --bold
       set -x color_currentos                $base0B $colorfg --bold
+      set -x color_nix                      $base0D $colorfg --bold
 
     case 'base16' 'base16-dark'
       set -l base00 181818
@@ -273,6 +280,7 @@ function __bobthefish_colors -S -a color_scheme -d 'Define colors used by bobthe
       set -x color_virtualgo                $base0D $colorfg --bold
       set -x color_desk                     $base0D $colorfg --bold
       set -x color_currentos                $base0B $colorfg --bold
+      set -x color_nix                      $base0D $colorfg --bold
 
     case 'solarized-light'
       set -l base03  002b36
@@ -323,6 +331,7 @@ function __bobthefish_colors -S -a color_scheme -d 'Define colors used by bobthe
       set -x color_virtualgo                $cyan $colorfg --bold
       set -x color_desk                     $cyan $colorfg --bold
       set -x color_currentos                $green $colorfg --bold
+      set -x color_nix                      $cyan $colorfg --bold
 
     case 'solarized' 'solarized-dark'
       set -l base03  002b36
@@ -373,6 +382,7 @@ function __bobthefish_colors -S -a color_scheme -d 'Define colors used by bobthe
       set -x color_virtualgo                $cyan $colorfg --bold
       set -x color_desk                     $cyan $colorfg --bold
       set -x color_currentos                $green $colorfg --bold
+      set -x color_nix                      $cyan $colorfg --bold
 
     case 'light'
       #               light  medium dark
@@ -416,6 +426,7 @@ function __bobthefish_colors -S -a color_scheme -d 'Define colors used by bobthe
       set -x color_virtualgo                $blue[2] $grey[1] --bold
       set -x color_desk                     $blue[2] $grey[1] --bold
       set -x color_currentos                $green $colorfg --bold
+      set -x color_nix                      $blue[2] $grey[1] --bold
 
     case 'gruvbox'
       #               light  medium  dark  darkest
@@ -458,6 +469,7 @@ function __bobthefish_colors -S -a color_scheme -d 'Define colors used by bobthe
       set -x color_virtualgo             $blue[2] $fg[2] --bold
       set -x color_desk                  $blue[2] $fg[2] --bold
       set -x color_currentos             $green $colorfg --bold
+      set -x color_nix                   $blue[2] $fg[2] --bold
 
     case 'dracula' # https://draculatheme.com
       set -l bg           282a36
@@ -502,6 +514,56 @@ function __bobthefish_colors -S -a color_scheme -d 'Define colors used by bobthe
       set -x color_virtualgo             $cyan $bg --bold
       set -x color_desk                  $comment $bg --bold
       set -x color_currentos             $green $bg --bold
+      set -x color_nix                   $cyan $bg --bold
+
+    case 'nord'
+      set -l base00  2E3440
+      set -l base01  3B4252
+      set -l base02  434C5E
+      set -l base03  4C566A
+      set -l base04  D8DEE9
+      set -l base05  E5E9F0
+      set -l base06  ECEFF4
+      set -l base07  8FBCBB
+      set -l base08  88C0D0
+      set -l base09  81A1C1
+      set -l base0A  5E81AC
+      set -l base0B  BF616A
+      set -l base0C  D08770
+      set -l base0D  EBCB8B
+      set -l base0E  A3BE8C
+      set -l base0F  B48EAD
+
+      set -l colorfg $base00
+
+      set -x color_initial_segment_exit     $base05 $base08 --bold
+      set -x color_initial_segment_su       $base05 $base0B --bold
+      set -x color_initial_segment_jobs     $base08 $base0D --bold
+
+      set -x color_path                     $base02 $base05
+      set -x color_path_basename            $base02 $base06 --bold
+      set -x color_path_nowrite             $base02 $base08
+      set -x color_path_nowrite_basename    $base02 $base08 --bold
+
+      set -x color_repo                     $base0E $colorfg
+      set -x color_repo_work_tree           $base02 $colorfg --bold
+      set -x color_repo_dirty               $base0B $colorfg
+      set -x color_repo_staged              $base0D $colorfg
+
+      set -x color_vi_mode_default          $base08 $colorfg --bold
+      set -x color_vi_mode_insert           $base06 $colorfg --bold
+      set -x color_vi_mode_visual           $base07 $colorfg --bold
+
+      set -x color_vagrant                  $base02 $colorfg --bold
+      set -x color_k8s                      $base02 $colorfg --bold
+      set -x color_username                 $base02 $base0D --bold
+      set -x color_hostname                 $base02 $base0D
+      set -x color_rvm                      $base09 $colorfg --bold
+      set -x color_nvm                      $base09 $colorfg --bold
+      set -x color_virtualfish              $base09 $colorfg --bold
+      set -x color_virtualgo                $base09 $colorfg --bold
+      set -x color_desk                     $base09 $colorfg --bold
+      set -x color_currentos                $base09 $colorfg --bold
 
     case '*' # default dark theme
       #               light  medium dark
@@ -546,6 +608,7 @@ function __bobthefish_colors -S -a color_scheme -d 'Define colors used by bobthe
       set -x color_virtualgo                $go_blue $black --bold
       set -x color_desk                     $blue[2] $grey[1] --bold
       set -x color_currentos                $green $white --bold
+      set -x color_nix                      $blue[2] $grey[1] --bold
   end
 end
 
@@ -571,6 +634,7 @@ function __bobthefish_user_color_scheme_deprecated
   set -q __color_virtualfish;           or set -l __color_virtualfish           005faf cccccc --bold
   set -q __color_virtualgo;             or set -l __color_virtualgo             005faf cccccc --bold
   set -q __color_desk;                  or set -l __color_desk                  005faf cccccc --bold
+  set -q __color_nix;                   or set -l __color_nix                   005faf cccccc --bold
 
   set_color black -b red --bold
   echo "The 'user' color scheme is deprecated."
@@ -607,6 +671,7 @@ function __bobthefish_user_color_scheme_deprecated
   set -x color_virtualfish           $__color_virtualfish
   set -x color_virtualgo             $__color_virtualgo
   set -x color_desk                  $__color_desk
+  set -x color_nix                   $__color_nix
 end"
 
   echo
diff --git a/functions/__bobthefish_glyphs.fish b/functions/__bobthefish_glyphs.fish
index 98bf004..42491b2 100644
--- a/functions/__bobthefish_glyphs.fish
+++ b/functions/__bobthefish_glyphs.fish
@@ -21,6 +21,7 @@ function __bobthefish_glyphs -S -d 'Define glyphs used by bobthefish'
 
   set -x ruby_glyph              ''
   set -x go_glyph                ''
+  set -x nix_glyph               ''
 
   # Desk glyphs
   set -x desk_glyph              \u25F2
@@ -79,6 +80,7 @@ function __bobthefish_glyphs -S -d 'Define glyphs used by bobthefish'
     set detached_glyph   \uF417
     set tag_glyph        \uF412
 
+    set nix_glyph        \uF313 ' ' # nf-linux-nixos
     set virtualenv_glyph \uE73C ' '
     set ruby_glyph       \uE791 ' '
     set go_glyph         \uE626 ' '
diff --git a/functions/bobthefish_display_colors.fish b/functions/bobthefish_display_colors.fish
index 2abb5ab..b889449 100644
--- a/functions/bobthefish_display_colors.fish
+++ b/functions/bobthefish_display_colors.fish
@@ -23,8 +23,16 @@ function bobthefish_display_colors -a color_scheme -d 'Print example prompt colo
       __bobthefish_colors $color_scheme
 
     case ''
-      [ -n "$theme_color_scheme" ]
-      and echo "$theme_color_scheme:"
+      if type -q bobthefish_colors
+        if [ -n "$theme_color_scheme" ]
+          echo "$theme_color_scheme (with bobthefish_colors overrides):"
+        else
+          echo 'custom (via bobthefish_colors):'
+        end
+      else if [ -n "$theme_color_scheme" ]
+        echo "$theme_color_scheme:"
+      end
+
       __bobthefish_colors $theme_color_scheme
       type -q bobthefish_colors
         and bobthefish_colors