[PATCH] Add Mercurial Queues support to VCS_Info

[Lionel Flandrin <simias.n@xxxxxxxxx>]

Hello,

 These patches add support for Mercurial Queues in VCS_Info in quite
the same way it already supports git's equivalent "stgit".

 With these patches applied, the %m modifier in the branchformat is
replaced by the current applied patch if there's one, "no patch
applied" otherwise.

 It also adds a "hgrevformat" style since hg can reference a changeset
either by its hash or its local revision number. The default is
"%r:%h" and is how Hg usually formats the revision (e.g.:
1929:c562d287254).

 The first patch is the code, the second the documentation.

Cheers,
-- 
Lionel Flandrin

Support for Mercurial Queues in VCS_INFO

diff --git a/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg b/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg
--- a/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg
+++ b/Functions/VCS_Info/Backends/VCS_INFO_get_data_hg
@@ -3,7 +3,21 @@
 ## Distributed under the same BSD-ish license as zsh itself.
 
 setopt localoptions NO_shwordsplit
-local file hgbranch hgbranch_name hgbase hghash hglrev r_branch r_info
+local file hgbranch hgbranch_name hgbase hghash hglrev hgmisc r_branch r_info revformat
+
+VCS_INFO_hg_get_mq_top_patch () {
+    local patchdir=$1
+
+    if [[ -e "${patchdir}/status" ]]; then
+        local -a patches
+        patches=(${(f)"$(< "${patchdir}/status")"})
+        printf "%s" "${patches[-1]/[^:]*:/}"
+        return 0
+    fi
+
+    return 1
+}
+
 
 hgbase=${vcs_comm[basedir]}
 rrn=${hgbase:t}
@@ -34,6 +48,8 @@
     done
 
     if [[ -n ${hglrev} ]] ; then
+        zstyle -s ":vcs_info:${vcs}:${usercontext}:${rrn}" hgrevformat revformat || revformat="%r:%h"
+        zformat -f hglrev "${revformat}" "r:${hglrev}" "h:${hghash}"
         zstyle -s ":vcs_info:${vcs}:${usercontext}:${rrn}" branchformat hgbranch || hgbranch="%b:%r"
         zformat -f hgbranch "${hgbranch}" "b:${hgbranch_name}" "r:${hglrev}"
     fi
@@ -41,5 +57,15 @@
     hgbranch="${hgbranch_name}"
 fi
 
-VCS_INFO_formats '' "${hgbranch}" "${hgbase}" '' '' "${hglrev}" "${hghash}"
+local patchdir=${hgbase}/.hg/patches/
+
+if [[ -d $patchdir ]] ; then
+    hgmisc=$(VCS_INFO_hg_get_mq_top_patch "${patchdir}")
+
+    hgmisc=${hgmisc:-"no patch applied"}
+else
+    hgmisc=''
+fi
+
+VCS_INFO_formats '' "${hgbranch}" "${hgbase}" '' '' "${hglrev}" "${hgmisc}"
 return 0

Updated contrib.yo regarding Mercurial Queues support in VCS_INFO

diff --git a/Doc/Zsh/contrib.yo b/Doc/Zsh/contrib.yo
--- a/Doc/Zsh/contrib.yo
+++ b/Doc/Zsh/contrib.yo
@@ -493,6 +493,13 @@
 tt(stgit)-initialized branches. This style let's you modify how that string
 should look like.
 )
+kindex(hgrevformat)
+item(tt(hgrevformat))(
+tt(hg) uses both a hash and a revision number to reference a specific
+changeset in a repository. With this style you can format the revision
+string (see var(branchformat)) to include either of both. It's only
+useful when var(get-revision) is true.
+)
 kindex(max-exports)
 item(tt(max-exports))(
 Defines the maximum number if
@@ -610,9 +617,10 @@
 startsitem()
 sitem(tt(formats))(" (%s)-[%b|%a]-")
 sitem(tt(actionformats))(" (%s)-[%b]-")
-sitem(tt(branchformat))("%b:%r" (for bzr, svn and svk))
+sitem(tt(branchformat))("%b:%r" (for bzr, svn, svk and hg))
 sitem(tt(nvcsformats))("")
 sitem(tt(stgitformat))(" %p (%c)")
+sitem(tt(hgrevformat))("%r:%h")
 sitem(tt(max-exports))(2)
 sitem(tt(enable))(ALL)
 sitem(tt(disable))((empty list))
@@ -635,7 +643,8 @@
 sitem(tt(%b))(Information about the current branch.)
 sitem(tt(%a))(An identifier, that describes the action. Only makes sense in
 actionformats.)
-sitem(tt(%i))(The current revision number or identifier.)
+sitem(tt(%i))(The current revision number or identifier. For tt(hg)
+the var(hgrevformat) style may be used to customize the output.)
 sitem(tt(%c))(The string from the var(stagedstr) style if there are staged
 changes in the repository.)
 sitem(tt(%u))(The string from the var(unstagedstr) style if there are unstaged
@@ -648,7 +657,7 @@
 sitem(tt(%m))(A "misc" replacement. It is at the discretion of the backend
 to decide what this replacement expands to. It is currently used by
 the tt(hg) and tt(git) backends. The tt(hg) backend replaces tt(%m) with the
-global hash value of the current revision and the tt(git) backend replaces it
+topmost Mq patch applied (qtop) and the tt(git) backend replaces it
 with the string from the var(stgitformat) style.)
 endsitem()
 
@@ -656,7 +665,7 @@
 
 startsitem()
 sitem(tt(%b))(the branch name)
-sitem(tt(%r))(the current revision number)
+sitem(tt(%r))(the current revision number or the var(hgrevformat) style for tt(hg))
 endsitem()
 
 In tt(stgitformat) these replacements are done:
@@ -666,6 +675,13 @@
 sitem(tt(%c))(the number of unapplied patches)
 endsitem()
 
+In tt(hgrevformat) these replacements are done:
+
+startsitem()
+sitem(tt(%r))(the current revision number)
+sitem(tt(%h))(the hash identifier for the current resivion in short form)
+endsitem()
+
 Not all vcs backends have to support all replacements. For tt(nvcsformats)
 no replacements are performed at all. It is just a string.

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