PATCH: PATCH: vcs_info: Detect very old mercurial repositories

[Frank Terbeck <ft@bewatermyfriend.org>]

On IRC Chris AtLee reported, that vcs_info's mercurial backend fails
to detect very very old mercurial repositories. Seth House dug back into
history and found out that checking for .hg/data will work these ancient
repositories.

This changes VCS_INFO_bydir_detect() to be able to check for more than
one file in `${vcs_comm[detect_need_file]}'. This limits file names
in that variable to not include spaces. That is not an issue currently
and shouldn't be in the future.

In essence, this looks for .hg/store to detect current repositories and
for .hg/data for ancient ones.
---
 Functions/VCS_Info/Backends/VCS_INFO_detect_hg   |    2 +-
 Functions/VCS_Info/Backends/VCS_INFO_get_data_hg |    2 +-
 Functions/VCS_Info/VCS_INFO_bydir_detect         |   10 ++++++----
 3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/Functions/VCS_Info/Backends/VCS_INFO_detect_hg b/Functions/VCS_Info/Backends/VCS_INFO_detect_hg
index e2866af..a22c1ee 100644
--- a/Functions/VCS_Info/Backends/VCS_INFO_detect_hg
+++ b/Functions/VCS_Info/Backends/VCS_INFO_detect_hg
@@ -7,7 +7,7 @@ setopt localoptions NO_shwordsplit
 [[ $1 == '--flavours' ]] && { print -l hg-git hg-hgsubversion hg-hgsvn; return 0 }
 
 VCS_INFO_check_com ${vcs_comm[cmd]} || return 1
-vcs_comm[detect_need_file]=store
+vcs_comm[detect_need_file]="store data"
 VCS_INFO_bydir_detect '.hg' || return 1
 
 if [[ -d ${vcs_comm[basedir]}/.hg/svn ]] ; then
diff --git a/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg b/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg
index 8e91d26..a1b87f5 100644
--- a/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg
+++ b/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg
@@ -50,7 +50,7 @@ if zstyle -t ":vcs_info:${vcs}:${usercontext}:${rrn}" get-revision ; then
             "check-for-changes" || hgid_args+=( -r. )
 
         local HGRCPATH
-        HGRCPATH="/dev/null" ${vcs_comm[cmd]} ${(z)hgid_args} \
+        HGRCPATH="/dev/null" ${vcs_comm[cmd]} ${(z)hgid_args} 2> /dev/null \
             | read -r r_csetid r_lrev r_branch
     fi
 fi
diff --git a/Functions/VCS_Info/VCS_INFO_bydir_detect b/Functions/VCS_Info/VCS_INFO_bydir_detect
index 0b5996f..70b0fb6 100644
--- a/Functions/VCS_Info/VCS_INFO_bydir_detect
+++ b/Functions/VCS_Info/VCS_INFO_bydir_detect
@@ -4,15 +4,17 @@
 
 setopt localoptions NO_shwordsplit
 local dirname=$1
-local basedir="." realbasedir
+local basedir="." realbasedir file
 
 realbasedir="$(VCS_INFO_realpath ${basedir})"
 while [[ ${realbasedir} != '/' ]]; do
     [[ -r ${realbasedir} ]] || return 1
     if [[ -n ${vcs_comm[detect_need_file]} ]] ; then
-        [[ -d ${basedir}/${dirname} ]] && \
-        [[ -e ${basedir}/${dirname}/${vcs_comm[detect_need_file]} ]] && \
-            break
+        [[ -d ${basedir}/${dirname} ]] && {
+            for file in ${(s: :)${vcs_comm[detect_need_file]}}; do
+                [[ -e ${basedir}/${dirname}/${file} ]] && break 2
+            done
+        }
     else
         [[ -d ${basedir}/${dirname} ]] && break
     fi
-- 
1.7.4.rc1.7.g2cf08