PATCH: (3/5) Add information about hg's local revision number and the commit's hash

[Frank Terbeck <ft@bewatermyfriend.org>]

The local revision number is in %i and branchformat's %r (yes, the hg
backend has a branchformat now, but only if get-revision is set).

The commit's hash is in %m - the "misc" parameter to VCS_INFO_formats().

Example:
[snip]
autoload -Uz vcs_info; vcs_info

zstyle ':vcs_info:*'    max-exports   2
zstyle ':vcs_info:*'    formats       '(%s)-[%b]-'    '%m'
zstyle ':vcs_info:*'    actionformats '(%s)-[%b|%a]-' '%m'
zstyle ':vcs_info:hg:*' get-revision  true

function precmd() {
    psvar=()
    vcs_info
    [[ -n "${vcs_info_msg_0_}" ]] && psvar[1]="${vcs_info_msg_0_}"
    [[ -n "${vcs_info_msg_1_}" ]] && psvar[2]="${vcs_info_msg_1_}"
}

PS1='%~%(1v. %1v.)%# '
RPS1='%(2v.[%2v].)'
[snap]
---
 Functions/VCS_Info/Backends/VCS_INFO_get_data_hg |   33 ++++++++++++++++++++--
 1 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg b/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg
index d70e03c..f8e21a9 100644
--- a/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg
+++ b/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg
@@ -3,10 +3,37 @@
 ## Distributed under the same BSD-ish license as zsh itself.
 
 setopt localoptions NO_shwordsplit
-local hgbranch hgbase
+local hgbranch hgbranch_name hgbase hghash hglrev r_branch r_info
 
 hgbase=${vcs_comm[basedir]}
 rrn=${hgbase:t}
-hgbranch=$(< ${hgbase}/.hg/branch)
-VCS_INFO_formats '' "${hgbranch}" "${hgbase}" '' '' '' ''
+hgbranch_name=$(< ${hgbase}/.hg/branch)
+
+hghash=''
+hglrev=''
+if zstyle -t ":vcs_info:${vcs}:${usercontext}:${rrn}" get-revision ; then
+    # Calling the 'hg' program is quite a bit too slow for prompts.
+    # If there's a way around that, I'd be interested.
+    # Disabled by default anyway, so no harm done.
+
+    HGRCPATH="/dev/null" ${vcs_comm[cmd]} branches \
+    | while read -r r_branch r_info ; do
+        if [[ ${r_branch} == ${hgbranch_name} ]] ; then
+            match=()
+            : ${r_info/(#b)([^:]##):(*)}
+            hglrev=${match[1]}
+            hghash=${match[2]}
+            break
+        fi
+    done
+
+    if [[ -n ${hglrev} ]] ; then
+        zstyle -s ":vcs_info:${vcs}:${usercontext}:${rrn}" branchformat hgbranch || hgbranch="%b:%r"
+        zformat -f hgbranch "${hgbranch}" "b:${hgbranch_name}" "r:${hglrev}"
+    fi
+else
+    hgbranch="${hgbranch_name}"
+fi
+
+VCS_INFO_formats '' "${hgbranch}" "${hgbase}" '' '' "${hglrev}" "${hghash}"
 return 0
-- 
1.6.2.1.136.g8e24