From: Mark Wooding <mdw@distorted.org.uk>
Date: Fri, 8 May 2020 22:43:31 +0000 (+0100)
Subject: dot/shell-rc: Cache whether we're running as root.
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/profile/commitdiff_plain/fde3353fbc08069652329af2bd3d4755da385451?ds=inline

dot/shell-rc: Cache whether we're running as root.

Rather than running `id' every time.  What was I thinking?
---

diff --git a/dot/shell-rc b/dot/shell-rc
index ee9161d..9857a82 100644
--- a/dot/shell-rc
+++ b/dot/shell-rc
@@ -70,6 +70,11 @@ __mdw_set_prompt_hacks () { host=$__mdw_host; dir=""; }
 : ${USER-${LOGNAME-$(id -un)}}
 __mdw_user=$USER
 
+case $(id -u) in
+  0) __mdw_rootp=t ;;
+  *) __mdw_rootp=nil ;;
+esac
+
 __mdw_set_prompt_pieces () {
 
   ## Fancy highlighting in some terminals.
@@ -82,12 +87,12 @@ __mdw_set_prompt_pieces () {
   ## highlight when I'm running as some other user.  Highlight when this
   ## isn't the outermost shell on the terminal.
   local left right u tty
-  case $(id -u) in
-    0)
+  case $__mdw_rootp in
+    t)
       left=$(echo « | iconv -f UTF-8 -t //translit)
       right=$(echo » | iconv -f UTF-8 -t //translit)
       ;;
-    *)
+    nil)
       case $USER in
 	mdw | mwooding | nemo) u="" left="[" right="]" ;;
 	*) u="$__mdw_user@" left="{" right="}" ;;