get_merge_base(): Change default base to `master...`

Add the range filter to try to remove commits that we don't care about.
Still not sure if this will work in all cases, as sometimes `..` seemed
to give me the right collection of files and sometimes `...` did.

code-review-difftool:
Pass the merge base without range dots (`..` or `...`) to Vim Fugitive,
as it doesn't accept revisions with ranges. Not sure what to do if I get
a range with two revision names yet, though.

Turns on Bash's `extglob` in order to use `?(...)` to include both
patterns in the expansion.

2 files changed, 13 insertions, 3 deletions

diff --git a/code-review-database b/code-review-database
index 5c931c6..3c3a1ee 100644
--- a/code-review-database
+++ b/code-review-database
@@ -70,10 +70,10 @@ function create_merge_base_from_current () {
 
 function get_merge_base () {
 	local head="$(current_branch)"
-	local default_base='master'
+	local default_base='master...'
 
 	if git config remote.origin.url > /dev/null; then
-		default_base='origin/master'
+		default_base='origin/master...'
 	fi
 
 	sqlite3 "$DATABASE" <<-SQL
diff --git a/code-review-difftool b/code-review-difftool
index b6c6b8e..7976d92 100755
--- a/code-review-difftool
+++ b/code-review-difftool
@@ -21,6 +21,16 @@ SCRIPT="$(dirname "$0")"
 source "$SCRIPT/code-review-database"
 
 
+# shopt -s extglob
+# echo "${y%%?(..|...)}"
+# shopt -u extglob
+
+
 review_base="$(get_merge_base)"
 
-vim -c "tabdo Gdiff $review_base" -p $(code-review changed-files)
+# Remove dot ranges at the end of a revision as Fugitive doesn't support them.
+shopt -s extglob
+review_base_without_dots="${review_base%%?(..|...)}"
+shopt -u extglob
+
+vim -c "tabdo Gdiff $review_base_without_dots" -p $(code-review changed-files)