Re: extended braces syntax, {1..32..-03}

[Peter Stephenson <p.w.stephenson@ntlworld.com>]

On Sun, 5 Dec 2010 16:41:20 +0100
Mikael Magnusson <mikachu@gmail.com> wrote:
> This patch adds the syntax {start..end..step} to brace expansion. It
> also allows negative numbers to be used (this was allowed when
> braceccl was set before, which worked inconsistently). It also fixes
> up zero-padding with negative numbers. You can specify zeropadding in
> the step, as well as a negative step.
>...
> Missing still is documentation, but I've had this lying around since
> august so I figured I'd post it and see if anyone wants to change
> anything first.

As long as we tests that pass, it's OK by me.

Embarrassingly, there isn't a set of tests for brace expansion at the
moment, though a few aspects are covered in other tests.  Here is a
short 'before' set of tests (I tried it out with the patch applied even
though it doesn't test the new features).

Index: Test/.distfiles
===================================================================
RCS file: /cvsroot/zsh/zsh/Test/.distfiles,v
retrieving revision 1.26
diff -p -u -r1.26 .distfiles
--- Test/.distfiles	24 Apr 2009 09:11:59 -0000	1.26
+++ Test/.distfiles	5 Dec 2010 17:23:35 -0000
@@ -28,6 +28,7 @@ D05array.ztst
 D06subscript.ztst
 D07multibyte.ztst
 D08cmdsubst.ztst
+D09brace.ztst
 E01options.ztst
 E02xtrace.ztst
 Makefile.in
Index: Test/D09brace.ztst
===================================================================
RCS file: Test/D09brace.ztst
diff -N Test/D09brace.ztst
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ Test/D09brace.ztst	5 Dec 2010 17:23:35 -0000
@@ -0,0 +1,52 @@
+# Tests for brace expansion
+
+%prep
+
+  foo=(a b c)
+  arr=(foo bar baz)
+
+%test
+
+  print X{1,2,{3..6},7,8}Y
+0:Basic brace expansion
+>X1Y X2Y X3Y X4Y X5Y X6Y X7Y X8Y
+
+  print ${foo}{one,two,three}$arr
+0:Brace expansion with arrays, no RC_EXPAND_PARAM
+>a b conefoo ctwofoo cthreefoo bar baz
+
+  print ${^foo}{one,two,three}$arr
+0:Brace expansion with arrays, with RC_EXPAND_PARAM (1)
+>aonefoo atwofoo athreefoo bonefoo btwofoo bthreefoo conefoo ctwofoo cthreefoo bar baz
+
+  print ${foo}{one,two,three}$^arr
+0:Brace expansion with arrays, with RC_EXPAND_PARAM (2)
+>a b conefoo ctwofoo cthreefoo conebar ctwobar cthreebar conebaz ctwobaz cthreebaz
+
+  print ${^foo}{one,two,three}$^arr
+0:Brace expansion with arrays, with RC_EXPAND_PARAM (3)
+>aonefoo atwofoo athreefoo aonebar atwobar athreebar aonebaz atwobaz athreebaz bonefoo btwofoo bthreefoo bonebar btwobar bthreebar bonebaz btwobaz bthreebaz conefoo ctwofoo cthreefoo conebar ctwobar cthreebar conebaz ctwobaz cthreebaz
+
+  print X{01..4}Y
+0:Numeric range expansion, padding (1)
+>X01Y X02Y X03Y X04Y
+
+  print X{1..04}Y
+0:Numeric range expansion, padding (2)
+>X01Y X02Y X03Y X04Y
+
+  print X{7..12}Y
+0:Numeric range expansion, padding (or not) (3)
+>X7Y X8Y X9Y X10Y X11Y X12Y
+
+  print X{07..12}Y
+0:Numeric range expansion, padding (4)
+>X07Y X08Y X09Y X10Y X11Y X12Y
+
+  print X{7..012}Y
+0:Numeric range expansion, pading (5)
+>X007Y X008Y X009Y X010Y X011Y X012Y
+
+  print X{4..1}Y
+0:Numeric range expansion, decreasing
+>X4Y X3Y X2Y X1Y

-- 
Peter Stephenson <p.w.stephenson@ntlworld.com>
Web page now at http://homepage.ntlworld.com/p.w.stephenson/