From 6a4598f7067a7ea794f7288d84b2f99708b96fc8 Mon Sep 17 00:00:00 2001
From: JunsuChoi <jsuya.choi@samsung.com>
Date: Wed, 13 Jan 2021 13:12:57 +0900
Subject: [PATCH] infra coding_style: Add coding style check bot

Add a bot that checks the coding style using cpplint
and reports the result as a review comment.

This feature refers to the repository where cpplint
and docker settings with github-action.
This action works whenever a PR is created and updated.

In cpplint, only the violation of ThorVG's coding style is reported
as a warning using several options.
whitespace/parens
whitespace/indent
whitespace/end_of_line
whitespace/blank_line

The bot will review all of the contents of all files in the current commit file list,
However, in the future, we will improve Bot to only review the changes.
---
 .github/workflows/actions_cpplint.yml | 33 +++++++++++++++
 .github/workflows/cpp_lint_check.sh   | 59 +++++++++++++++++++++++++++
 2 files changed, 92 insertions(+)
 create mode 100644 .github/workflows/actions_cpplint.yml
 create mode 100644 .github/workflows/cpp_lint_check.sh

diff --git a/.github/workflows/actions_cpplint.yml b/.github/workflows/actions_cpplint.yml
new file mode 100644
index 00000000..da706169
--- /dev/null
+++ b/.github/workflows/actions_cpplint.yml
@@ -0,0 +1,33 @@
+name: PullRequest_Checker
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        submodules: true
+
+    - name: Install Packages
+      run: |
+        sudo apt-get update
+        sudo apt-get install curl
+        sudo apt-get install cmake jq clang
+        sudo apt-get install software-properties-common
+        sudo apt-get install python3-pip
+        pip3 install wheel --user
+        pip3 install cpplint --user
+
+    - name: Run Cpplint Script
+      run: |
+        export PATH=$PATH:~/.local/bin/
+        chmod +x "${GITHUB_WORKSPACE}/.github/workflows/cpp_lint_check.sh"
+        "${GITHUB_WORKSPACE}/.github/workflows/cpp_lint_check.sh"
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
diff --git a/.github/workflows/cpp_lint_check.sh b/.github/workflows/cpp_lint_check.sh
new file mode 100644
index 00000000..c130da3f
--- /dev/null
+++ b/.github/workflows/cpp_lint_check.sh
@@ -0,0 +1,59 @@
+#!/bin/bash
+
+if [[ -z "$GITHUB_TOKEN" ]]; then
+	echo "The GITHUB_TOKEN is required."
+	exit 1
+fi
+
+FILES_LINK=`jq -r '.pull_request._links.self.href' "$GITHUB_EVENT_PATH"`/files
+echo "Files = $FILES_LINK"
+
+curl $FILES_LINK > files.json
+FILES_URLS_STRING=`jq -r '.[].raw_url' files.json`
+
+readarray -t URLS <<<"$FILES_URLS_STRING"
+
+echo "File names: $URLS"
+
+mkdir files
+cd files
+for i in "${URLS[@]}"
+do
+   echo "Downloading $i"
+   curl -LOk --remote-name $i 
+done
+
+echo "Files downloaded!"
+echo "Performing checkup:"
+
+cpplint --filter=-,\
++whitespace/parens,\
++whitespace/indent,\
++whitespace/end_of_line,\
++whitespace/blank_line \
+--extension=cpp,h,c \
+--recursive \
+./ > cpp-report.txt 2>&1
+
+PAYLOAD_CPPLINT=`cat cpp-report.txt`
+COMMENTS_URL=$(cat $GITHUB_EVENT_PATH | jq -r .pull_request.comments_url)
+  
+echo $COMMENTS_URL
+echo "Cppcheck errors:"
+echo $PAYLOAD_CPPLINT
+
+if [[ $PAYLOAD_CPPLINT == *"Total errors found: "* ]]; then
+  OUTPUT+=$'\n**CODING STYLE CHECK**:\n'
+  OUTPUT+=$'\n```\n'
+  OUTPUT+="$PAYLOAD_CPPLINT"
+  OUTPUT+=$'\n```\n' 
+
+else
+  OUTPUT+=$'\n**CODING STYLE CHECK**:\n'
+  OUTPUT+=$'\n```\n'
+  OUTPUT+="Perfect."
+  OUTPUT+=$'\n```\n' 
+fi
+PAYLOAD=$(echo '{}' | jq --arg body "$OUTPUT" '.body = $body')
+
+curl -s -S -H "Authorization: token $GITHUB_TOKEN" --header "Content-Type: application/vnd.github.VERSION.text+json" --data "$PAYLOAD" "$COMMENTS_URL"