# HG changeset patch
# User Augie Fackler <raf@durin42.com>
# Date 1457654188 18000
# Node ID 0ceb8554801eba7db799fd89d044cd16b8e67bcd
# Parent  0b8457903012e0311ad0c35c9cb7b266906d80d7
zsh: make vcs info in prompt async

Roughly cribbed from [0], but I'm hoping to rework this soon to use
the zsh async library that shouldn't require a tempfile.

0: http://www.anishathalye.com/2015/02/07/an-asynchronous-shell-prompt/

diff --git a/.shell.d/99.prompt.zsh b/.shell.d/99.prompt.zsh
--- a/.shell.d/99.prompt.zsh
+++ b/.shell.d/99.prompt.zsh
@@ -18,17 +18,24 @@ preexec () {
         fi
 }
 
+PROMPT_TMP="${HOME}/.augie-zsh-tmp-prompt"
+
 function right_side_prompt() {
     branch=`vcs_current_branch`
     if [ $? = 0 ] ; then
-        echo -n $branch
-    else
-        date '+%D %H:%M'
+        echo -n $branch > "$PROMPT_TMP"
+        kill -s USR1 $$
     fi
 }
 
+function TRAPUSR1() {
+    rps_branch=$(cat "$PROMPT_TMP")
+    zle && zle reset-prompt
+}
+
 function precmd () {
-    rps_branch=`right_side_prompt`
+    rps_branch="$(date '+%D %H:%M')"
+    right_side_prompt &!
 }
 
 if [ "x`whoami`" = "xroot" ] ; then