Fix pipe/&& precedence for some bash versions

[DrVanScott]

The fix introduced by c96e44a does not work for me. I use bash "4.3.11(1)-release (x86_64-pc-linux-gnu)" on Ubuntu 14.04. The test function

fc_check () {
  echo history:
  history | tail -3

  echo fc check
  fc -ln -1
  fc -ln -1 | head -1
  (fc -ln -1)
  (fc -ln -1 | head -1)
  echo $(fc -ln -1)
  echo $(fc -ln -1 | head -1)
}

produces the following output

history:
  552  echo c2
  553  echo c3
  554  fc_check 
fc check
     echo c3
     echo c3
     echo c3
     echo c3
echo c3
fc_check

The last two lines are quite surprising. My fix for this strange behaviour looks like this:

--- composure.sh_upstream   2014-11-20 00:27:16.726785858 +0100
+++ composure.sh    2014-11-20 00:28:57.223999557 +0100
@@ -284,7 +284,7 @@
   if [ -z "$num" ]; then
     typeset lines=1
     # some versions of 'fix command, fc' need corrective lenses...
-    (fc -ln -1 | grep -q draft) && lines=2
+    lines=$(fc -ln -1 | grep -q draft && echo 2 || echo 1)
     # parse last command from fc output
     cmd=$(fc -ln -$lines | head -1 | sed 's/^[[:blank:]]*//')
   else

[DrVanScott]

This fix also works on cygwin's bash, version 4.1.17(9)-release (i686-pc-cygwin)

[erichs]

Thank you for bringing this to my attention! I've been pondering how to properly fix the fc discrepancies across systems. I'll take this into consideration!