Add delete-merged script

README.md

@@ -18,4 +18,8 @@ $ git log-mr [<revision range>]
 
 # Lists local branches and their merge status, ordered by last commit date
 $ git lastbranch [--merged <rev>]
+
+# Deletes local branches that have been merged.
+# Keeps master, develop, and the current branch by default.
+$ git delete-merged [--merged <rev>] [--keep <regex of branches to keep>]
 ```

bin/git-delete-merged

+#!/usr/bin/env bash
+
+#
+# Deletes local branches that have been merged. Keeps master, develop and the current branch by default.
+#
+
+MERGE_TARGET='origin/develop'
+KEEP='master|develop'
+
+while :; do
+    case $1 in
+        --merged)
+            if [ -n "$2" ]; then
+                MERGE_TARGET=$2
+                shift
+            fi
+            ;;
+        --keep)
+            if [ -n "$2" ]; then
+                KEEP=$2
+                shift
+            fi
+            ;;
+        *)
+            break
+    esac
+
+    shift
+done
+
+current=$(git rev-parse --abbrev-ref HEAD)
+git for-each-ref refs/heads/ --format='%(refname:short)' --merged "${MERGE_TARGET}" | grep -v -E "(${current}|(${KEEP}))" | xargs git branch -d