[PATCH] Fix hexdump command used for mercurial dirstate parsing

[Reed Riley <john.reed.riley@gmail.com>]

Normally, the old command works.  But very rarely, it outputs a string
like the following instead:
❯ hexdump -n20 -e '1/1 "%02x"' .hg/dirstate
77bba665e970146bd2be0b2da40092e340*
8804

Changing the command resolves the problem:
❯ xxd -p -l20 .hg/dirstate
77bba665e970146bd2be0b2da40092e340408804
---
 Functions/VCS_Info/Backends/VCS_INFO_get_data_hg | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg b/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg
index f35ad59..abcd8bc 100644
--- a/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg
+++ b/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg
@@ -42,7 +42,7 @@ if zstyle -t ":vcs_info:${vcs}:${usercontext}:${rrn}" get-revision ; then
     if zstyle -t ":vcs_info:${vcs}:${usercontext}:${rrn}" use-simple \
             && ( VCS_INFO_check_com hexdump ) && [[ -r ${dirstatefile} ]] ; then
         # Calling hexdump is (much) faster than hg but doesn't get the local rev
-        r_csetid=$(hexdump -n 20 -e '1/1 "%02x"' ${dirstatefile})
+        r_csetid=$(xxd -p -l20 ${dirstatefile})
     else
         # Settling for a short (but unique!) hash because getting the full
         # 40-char hash in addition to all the other info we want isn't
-- 
2.10.2