git: add side-by-side diffs

bin/delta-wrapper

@@ -3,5 +3,7 @@
 #  - Use `git-delta` if installed.
 #  - Otherwise, fall back to `less`.
 command -v delta >/dev/null 2>&1 && exec delta --true-color=always "$@"
-exec less -F -X "$@"
 
+# Consume option that would confuse `less`.
+[ "$1" = "--side-by-side" ] && shift
+exec less -F -X "$@"

config/git/config

@@ -4,6 +4,8 @@
     ba      = bv --all
     cm      = commit --verbose
     co      = checkout
+    d       = diff
+    ds      = !GIT_PAGER=\"delta-wrapper --side-by-side\" git diff
     l       = log --graph --pretty=basic
     ln      = log --graph --pretty=name
     ll      = log --graph --decorate --stat