Init

.github/dependabot.yml

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+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.gitignore

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+### VisualStudioCode template
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/*.code-snippets
+
+# Local History for Visual Studio Code
+.history/
+
+# Built Visual Studio Code Extensions
+*.vsix
+
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# AWS User-specific
+.idea/**/aws.xml
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# SonarLint plugin
+.idea/sonarlint/
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+

README.md

@@ -1,2 +1,3 @@
 # git-branch-behind-main
+
 Check whether the current branch is behind main

action.yaml

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+name: "git-branch-behind-main"
+description: "Check whether the current branch is behind main"
+branding:
+  icon: git-branch
+  color: orange
+runs:
+  using: "composite"
+  steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Check
+      shell: bash
+      run: |
+        ./check.sh

check.sh

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+#!/bin/bash
+# refer to https://www.jianshu.com/p/dd1b924fe48e, thanks for the author
+set -eu
+
+git-log-flat-colored() {
+  git --no-pager log --format="%C(yellow)%h%Creset %C(cyan)%cd%Creset %s %Cgreen%an%Creset" --date=short "$@"
+}
+
+CURRENT_FEATURE=$(git symbolic-ref --short -q HEAD)
+CURRENT_PATH=$(git rev-parse --show-toplevel)
+REFERENCE_BRANCH="origin/main"
+
+echo -e "\033[0;34m >>-----当前核查仓库路径${CURRENT_PATH}-----<< \033[0m"
+
+# Check if the "origin/main" branch exists, and if so, update the remote record and compare for any backward commits
+if git rev-parse --verify ${REFERENCE_BRANCH} >/dev/null 2>&1; then
+
+  git fetch origin
+
+  NB_COMMITS_BEHIND=$(git rev-list --left-right --count ${REFERENCE_BRANCH}...@ | cut -f1)
+
+  if [ "${NB_COMMITS_BEHIND}" -gt "0" ]; then
+    echo -e "\033[0;31m >>-----${CURRENT_FEATURE}-----<< 当前分支有 ${NB_COMMITS_BEHIND} 个提交落后于 \"${REFERENCE_BRANCH}\", 请合并最新的 master 分支代码\n \033[0m"
+    git-log-flat-colored ${REFERENCE_BRANCH} | head -"${NB_COMMITS_BEHIND}"
+    exit 2
+  else
+    echo -e "\033[0;32m >>-----${CURRENT_FEATURE}-----<<当前分支包含 ${REFERENCE_BRANCH} 分支上的所有提交记录 \033[0m"
+  fi
+else
+  echo -e "\033[0;31m >>-----不能比较，检测${REFERENCE_BRANCH}不存在-----<< \033[0m"
+  exit 2
+fi