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[PATCH] vcs_info git: Present merge heads as patches



This shows, during 'git merge', the revision hashes of the "remote" head
(the one that will become second parent of the commit) in the %m expando.
---

 Doc/Zsh/contrib.yo                                |  2 +-
 Functions/VCS_Info/Backends/VCS_INFO_get_data_git | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/Doc/Zsh/contrib.yo b/Doc/Zsh/contrib.yo
index db0940d..741d4ad 100644
--- a/Doc/Zsh/contrib.yo
+++ b/Doc/Zsh/contrib.yo
@@ -1339,7 +1339,7 @@ tt(formats) and tt(actionformats) and will be available in the global
 tt(backend_misc) array as tt(${backend_misc[bookmarks]}).
 )
 item(tt(gen-applied-string))(
-Called in the tt(git) (with tt(stgit) or during rebase), and tt(hg)
+Called in the tt(git) (with tt(stgit) or during rebase or merge), and tt(hg)
 (with tt(mq)) backends and in tt(quilt) support when the tt(applied-string)
 is generated; the tt(use-quilt) zstyle must be true for tt(quilt) (the tt(mq)
 and tt(stgit) backends are active by default).
diff --git a/Functions/VCS_Info/Backends/VCS_INFO_get_data_git b/Functions/VCS_Info/Backends/VCS_INFO_get_data_git
index 3fc861e..5c136d6 100644
--- a/Functions/VCS_Info/Backends/VCS_INFO_get_data_git
+++ b/Functions/VCS_Info/Backends/VCS_INFO_get_data_git
@@ -231,6 +231,23 @@ elif [[ -d "${gitdir}/rebase-apply" ]]; then
     git_patches_unapplied=($(seq $cur $(< "${patchdir}/last")))
 
     VCS_INFO_git_handle_patches
+elif [[ -f "${gitdir}/MERGE_HEAD" ]]; then
+    # This is 'git merge --no-commit'
+    local -a heads=( ${(@f)"$(<"${gitdir}/MERGE_HEAD")"} )
+    local subject;
+    IFS='' read -r subject < "${gitdir}/MERGE_MSG"
+    # $subject is the subject line of the would-be commit
+    # Maybe we can get the subject lines of MERGE_HEAD's commits cheaply?
+
+    local p
+    for p in $heads[@]; do
+      git_patches_applied+=("$p $subject")
+    done
+    unset p
+
+    # Not touching git_patches_unapplied
+
+    VCS_INFO_git_handle_patches
 else
     gitmisc=''
 fi
-- 
2.1.4




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