bin: add sync archive helpers

.local/bin/scripts/dif

@@ -1,3 +1,3 @@
 #!/bin/sh
-# diff with pagination
+# interactive diff with pagination
 diff --color=always --report-identical-files -U 2 "$@" | less --quit-if-one-screen

.local/bin/scripts/st-diff

@@ -0,0 +1,5 @@
+#!/bin/sh
+dif "$(st-unarchive "$1")" "$@"
+echo "y to restore"
+read answer
+test "$answer" = "y" && st-restore "$1" || exit 0

.local/bin/scripts/st-restore

@@ -0,0 +1,2 @@
+#!/bin/sh
+mv "$1" "$(st-unarchive "$1")"

.local/bin/scripts/st-unarchive

@@ -0,0 +1,2 @@
+#!/bin/sh
+echo "$1" | cut -d'/' -f3- | sed 's/[[:digit:]]\+\.//'