From 5692053379147dde8a8cabc226b73c2d5184f4c0 Mon Sep 17 00:00:00 2001
From: Malf Furious <m@lfurio.us>
Date: Fri, 1 Sep 2017 06:28:44 -0400
Subject: Rewrite rsync mod to drop remote support

Also added some helpers for the merge implementation.
---
 rsync.sh | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 84 insertions(+), 19 deletions(-)

diff --git a/rsync.sh b/rsync.sh
index 2a36053..5fc0c7d 100644
--- a/rsync.sh
+++ b/rsync.sh
@@ -2,14 +2,12 @@
 # systr_rsync_normal <src> <dst> [<link>]
 #
 # Perform normal rsync operations to transfer files to or from the
-# repository.  If <link> is set, it is used as the --link-dest value
-# for rsync.  This function is polymorphic for both local and remote
-# repositories.
+# repository.  If <link> is set, it is used as the --link-dest value.
 ##
 function systr_rsync_normal
 {
     if [ $# -lt 2 ]; then
-        echo "Fatal: too few arguments to systr_rsync_normal"
+        echo "Fatal: too few args to rsync_normal" >&2
         exit 1
     fi
 
@@ -22,21 +20,88 @@ function systr_rsync_normal
         link=""
     fi
 
-    if [[ "$remote" == "" ]]; then
-        rsync -az --info=progress2 --info=stats2 \
-            --delete --exclude='*.systr' \
-            $link \
-            "$src" "$dst"
+    rsync -az --info=progress2 --info=stats2 --delete \
+        --exclude='*.systr' $link "$src" "$dst"
+}
+
+##
+# systr_rsync_diff <src> <compare> <dst>
+#
+# Copy files from <src> to <dst>, but only if they've changed
+# since the state in <compare>.  Empty directories are
+# purged from <dst> afterward.
+##
+function systr_rsync_diff
+{
+    if [ $# -lt 3 ]; then
+        echo "Fatal: too few args to rsync_diff" >&2
+        exit 1
+    fi
+
+    src="$1"
+    compare="--compare-dest=$2"
+    dst="$3"
+
+    rsync -az --delete --exclude='*.systr' $compare \
+        "$src" "$dst"
+
+    find "$dst" -type d -empty -delete
+}
+
+##
+# systr_rsync_del <src> <compare> <dst>
+#
+# Delete files in <dst>, only if they have been deleted from
+# <compare> to <src>.  Deleted files in <dst> are 'backed up',
+# in rsync lingo, meaning they are actually renamed with a
+# suffix appended to the original filename.
+#
+# If <src> is the worktree ("."), our file suffix will be
+# '&' to signify files deleted by us.  Otherwise, the suffix
+# will be '~' to signify files deleted by 'them'.
+##
+function systr_rsync_del
+{
+    if [ $# -lt 3 ]; then
+        echo "Fatal: too few args to rsync_del" >&2
+        exit 1
+    fi
+
+    src="$1"
+    compare="--compare-dest=$2"
+    dst="$3"
+
+    if [[ "$src" == "." ]]; then
+        suffix="--suffix='&'"
     else
-        if [[ "$src" == "." ]]; then
-            dst="$remote:$dst"
-        else
-            src="$remote:$src"
-        fi
-
-        rsync -az -e ssh --info=progress2 --info=stats2 \
-            --delete --exclude='*.systr' \
-            $link \
-            "$src" "$dst"
+        suffix="--suffix='~'"
     fi
+
+    rsync -azb $suffix --existing --ignore-existing \
+        --delete --exclude='*.systr' $compare \
+        "$src" "$dst"
+}
+
+##
+# systr_rsync_merge <src> <dst>
+#
+# Finish setting up a merge, by copying files from the
+# temporary directory to the merge staging directory.
+#
+# Files in <dst> overwritten by this operation will
+# be suffixed with '*' to signify files modified by
+# both of us.
+##
+function systr_rsync_merge
+{
+    if [ $# -lt 2 ]; then
+        echo "Fatal: too few args to rsync_merge" >&2
+        exit 1
+    fi
+
+    src="$1"
+    dst="$2"
+
+    rsync -azb --suffix='*' --exclude='*.systr' \
+        "$src" "$dst"
 }
-- 
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