--- a/fish/config.fish	Tue Dec 12 22:10:14 2017 -0800
+++ b/fish/config.fish	Tue Dec 12 22:10:33 2017 -0800
@@ -4,12 +4,16 @@
 set -g -x fish_greeting 'Hello.'
 
 # Homebrew.
-set -g -x PATH /usr/local/sbin $PATH
-set -g -x PATH /usr/local/bin $PATH
+#set -g -x PATH /usr/local/sbin $PATH
+#set -g -x PATH /usr/local/bin $PATH
  
 # My own stuff.
-set -g -x PATH $HOME/.local/bin $PATH
-set -g -x PATH $HOME/bin $PATH
+if test -d $HOME/.local/bin
+    set -g -x PATH $HOME/.local/bin $PATH
+end
+if test -d $HOME/bin
+    set -g -x PATH $HOME/bin $PATH
+end
 set -g -x OS MacOSX
 set -g -x EDITOR vim
 set -g -x SHELL fish
@@ -20,10 +24,18 @@
 # Go.
 set -g -x GOPATH /usr/local/Cellar/go/1.4/gocode
 
+if type -q git 
+    set -g -x __local_has_git
+end
+if type -q hg
+    set -g -x __local_has_hg
+end
+
 # }}}
 
 # Aliases {{{
 
+# Run Tmux in UTF8 and 256 colours always.
 alias tm 'tmux -u2'
 
 # }}}
@@ -46,30 +58,36 @@
 end
 
 function prompt_char
-    if git branch >/dev/null 2>/dev/null 
-        printf '±' ; return
+    if set -q __local_has_git
+        if git branch >/dev/null 2>/dev/null 
+            printf '±' ; return
+        end
+        if hg root >/dev/null 2>/dev/null
+            printf '☿' ; return
+        end
+        echo '○'
     end
-    if hg root >/dev/null 2>/dev/null
-        printf '☿' ; return
-    end
-    echo '○'
 end
 
 function hg_prompt
-    set_color magenta
-    printf '%s' (fast-hg-bookmark 2>/dev/null)
-    set_color normal
+    if set -q __local_has_hg
+        set_color magenta
+        printf '%s' (fast-hg-bookmark 2>/dev/null)
+        set_color normal
+    end
 end
 
 function git_prompt
-    if git root >/dev/null 2>&1
-        set_color normal
-        printf ' on '
-        set_color magenta
-        printf '%s' (git currentbranch ^/dev/null)
-        set_color green
-        git_prompt_status
-        set_color normal
+    if set -q __local_has_git
+        if git root >/dev/null 2>&1
+            set_color normal
+            printf ' on '
+            set_color magenta
+            printf '%s' (git currentbranch ^/dev/null)
+            set_color green
+            git_prompt_status
+            set_color normal
+        end
     end
 end
 
@@ -128,7 +146,7 @@
 
 # Virtualenv wrapper for Fish {{{
 
-eval (/usr/local/bin/python2.7 -m virtualfish)
+#eval (python -m virtualfish)
 
 #set -g VIRTUALFISH_COMPAT_ALIASES # uncomment for virtualenvwrapper-style commands
 #. $HOME/.config/fish/virtualfish/virtual.fish