Add 'code-review-ddiff'

This is inspired by a Git alias I have, `git ddiff`, that opens the Git
diff in the Delta diff viewer (https://github.com/dandavison/delta).
Delta ends up being much nicer than regular Git diff for code reviews
because it renders syntax highlighting.

2 files changed, 25 insertions, 1 deletions

diff --git a/code-review-ddiff b/code-review-ddiff
new file mode 100755
index 0000000..bcca041
--- /dev/null
+++ b/code-review-ddiff
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+# Copyright (c) 2023  Teddy Wing
+#
+# This file is part of Code Review.
+#
+# Code Review is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Code Review is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Code Review. If not, see <https://www.gnu.org/licenses/>.
+
+SCRIPT="$(dirname "$0")"
+source "$SCRIPT/code-review-database"
+
+
+git -c core.pager='delta' diff "$(get_merge_base)" "$@"
diff --git a/code-review.bash-completion b/code-review.bash-completion
index 6eaa59a..aca5543 100644
--- a/code-review.bash-completion
+++ b/code-review.bash-completion
@@ -17,7 +17,7 @@
 
 function _code_review () {
 	local cur
-	local subcommands="changed-files commits diff difftool gh-start log start stat"
+	local subcommands="changed-files commits ddiff diff difftool gh-start log start stat"
 
 	COMPREPLY=()
 	cur=${COMP_WORDS[COMP_CWORD]}