Prevent bash complaining after setting PS1 and su-ing to someone else.

git-svn-id: https://svn.cambridge.iain.cx/profile/trunk@25 6be0d1a5-5cfe-0310-89b6-964be062b18b

diff --git a/.profile.d/ps1.bashrc b/.profile.d/ps1.bashrc
index bb05253..f3907ea 100644 (file)
--- a/.profile.d/ps1.bashrc
+++ b/.profile.d/ps1.bashrc
@@ -1,21 +1,27 @@
 # $Id$
-# VERSION 1.3 (2005-08-15)
 #
 # Coloured prompts for bash.
 #
 # Prompt is user@host:/dir$ where host is highlighted in green if the last 
 # command exited 0 or in red (followed by the error code) otherwise.
 #
+# Colouring is performed by the __ps1_col() and __ps1_ret() functions.
+# We redirect stderr to /dev/null when calling these functions to prevent 
+# bash complaining about not knowing them when you su to another user, 
+# retaining PS1 but not the function definitions.
+#
 # Override the PROMPT_OK_COLOUR and PROMPT_FAILED_COLOUR environment variables 
 # to set different colours.
 #
-# To use, add a call to __ps1 in your .bash_profile.
+# To use, add a call to __ps1 in your .bash_profile file.
+#
 
 export PROMPT_OK_COLOUR=${PROMPT_OK_COLOUR:-32}
 export PROMPT_FAILED_COLOUR=${PROMPT_OK_COLOUR:-31}
 
 function __ps1() {
   export PS1='\u@\[\033[1;$(__ps1_col $?)m\]\h\[\033[0m\]$(__ps1_ret $?):\w\$ '
+  export PS1='\u@\[\033[1;$(__ps1_col $? 2>/dev/null)m\]\h\[\033[0m\]$(__ps1_ret $? 2>/dev/null):\w\$ '
   return 0
 }