Respect PROMPT_DIRTRIM with some enhancements.

Shorten the path in the prompt when PROMPT_DIRTRIM is set but do so by
truncating components lower in the path rather than replacing them with
elipses.

diff --git a/.profile.d/ps1.bashrc b/.profile.d/ps1.bashrc
index 278f107..0283611 100644 (file)
--- a/.profile.d/ps1.bashrc
+++ b/.profile.d/ps1.bashrc
@@ -90,7 +90,7 @@ function __ps1() {
   # Default __ps1_user to 1.
   [ -z "$__ps1_user" ] && __ps1_user=1
 
-  PS1='\[\033[$(__ps1_background $?)m\]$(__ps1_user $? \u@)\[\033[$(__ps1_col $? 2>/dev/null)m\]$(__ps1_user $? \h)\[\033[$(__ps1_colour_escape $? $GIT_COLOUR $PROMPT_BACKGROUND_COLOUR)m\]$(__ps1_git $? 2>/dev/null)\[\033[0m\]\[\033[$(__ps1_colour_escape $? $P4_COLOUR $PROMPT_BACKGROUND_COLOUR)m\]$(__ps1_p4 $? 2>/dev/null)\[\033[0m\]\[\033[$(__ps1_colour_escape $? $SVN_COLOUR $PROMPT_BACKGROUND_COLOUR)m\]$(__ps1_svn $? 2>/dev/null)\[\033[$(__ps1_background $?)m\]$(__ps1_ret $? 2>/dev/null)$(__ps1_bg $?)$(__ps1_colon $?)\w\[\033[$(__ps1_root $? 2>/dev/null)m\]\$\[\033[0m\] '
+  PS1='\[\033[$(__ps1_background $?)m\]$(__ps1_user $? \u@)\[\033[$(__ps1_col $? 2>/dev/null)m\]$(__ps1_user $? \h)\[\033[$(__ps1_colour_escape $? $GIT_COLOUR $PROMPT_BACKGROUND_COLOUR)m\]$(__ps1_git $? 2>/dev/null)\[\033[0m\]\[\033[$(__ps1_colour_escape $? $P4_COLOUR $PROMPT_BACKGROUND_COLOUR)m\]$(__ps1_p4 $? 2>/dev/null)\[\033[0m\]\[\033[$(__ps1_colour_escape $? $SVN_COLOUR $PROMPT_BACKGROUND_COLOUR)m\]$(__ps1_svn $? 2>/dev/null)\[\033[$(__ps1_background $?)m\]$(__ps1_ret $? 2>/dev/null)$(__ps1_bg $?)$(__ps1_colon $?)$(__ps1_short $?)\[\033[$(__ps1_root $? 2>/dev/null)m\]\$\[\033[0m\] '
   return 0
 }
 
@@ -199,6 +199,34 @@ function __ps1_colon() {
   return $1
 }
 
+function __ps1_short() {
+  local dirtrim=${PROMPT_DIRTRIM//[^0-9]/}
+  dirtrim=${dirtrim##0}
+  if [ -z "$dirtrim" ]; then
+    echo "$PWD"
+    return $1
+  fi
+  local dirname=${PWD##*/}
+  local basename=${PWD%/$dirname}
+  local reversed=
+  local component
+  for component in ${basename//\// }; do
+    reversed="$component $reversed"
+  done
+  local n=1
+  local short=
+  for component in $reversed; do
+    if [ $n -ge $dirtrim ]; then
+      short="/${component:0:1}$short"
+    else
+      short="/$component$short"
+    fi
+    n=$((n+1))
+  done
+  echo "$short/$dirname"
+  return $1
+}
+
 function prompt() {
   local blurb="Usage: prompt hide|show <what>"