[Pull Request] Add PR autorename Action.

.github/pr_autorename.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+"""Update the name of PR.
+"""
+import sys
+def check(title:str):
+    """Check and update the name of PR.
+
+    Args:
+        title (str): _description_
+
+    Returns:
+        _type_: _description_
+    """
+
+    title = title.strip().replace("【", "[").replace("】", "]")
+    if(not title.startswith("[Pull Request]")):
+        temp = title.replace("(", "").replace("{", "").replace("[", "") \
+            .replace(")", "").replace("}", "").replace("]", "") \
+            .replace(" ", "").replace("_", "").replace("-", "") \
+            .lower().replace("ull", "").replace("equest", "")
+        if(temp.startswith("pr")):
+            temp = title.lower().replace("(", "[").replace("{", "[").replace(")", "]").replace("}", "]").replace("-", "_").replace(" ", "_")
+            content = ""
+            # 1. '[pull_request]: <title>'
+            if(temp.startswith("[pull_request]:")):
+                content = title[len("[pull_request]:"):].strip()
+            # 2. '[pull request] <title>'
+            elif(temp.startswith("[pull_request]")):
+                content = title[len("[pull_request]"):].strip()
+
+            # 3. '[pr]: <title>'
+            elif(temp.startswith("[pr]:")):
+                content = title[len("[pr]:"):].strip()
+            # 4. '[pr] <title>'
+            elif(temp.startswith("[pr]")):
+                content = title[len("[pr]"):].strip()
+
+            # 5. 'pull request: <title>'
+            elif(temp.startswith("pull_request:")):
+                content = title[len("pull_request:"):].strip()
+            # 5. 'pr: <title>'
+            elif(temp.startswith("pr:")):
+                content = title[len("pr:"):].strip()
+            else:
+                content = title
+            title = "[Pull Request] " + content
+        else:
+            title = "[Pull Request] " + title
+    return title
+
+print(check(sys.argv[1]))

.github/workflows/pr-autorename.yml

@@ -0,0 +1,40 @@
+name: Check Pull Request Title
+
+on:
+  pull_request:
+    types:
+      - opened
+
+jobs:
+  check_title:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Comment on Pull Request
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          pull_request_number=${{ github.event.pull_request.number }}
+          current_title="${{ github.event.pull_request.title }}"
+          message_body="The origin title of this PR is: '$current_title'. GitHub Action is checking it..."
+          curl -H "Authorization: Bearer ${GITHUB_TOKEN}" \
+            -H "Content-Type: application/json" \
+            -X POST \
+            -d '{"body":"'"$message_body"'"}' \
+            "https://api.github.com/repos/${{ github.repository }}/issues/$pull_request_number/comments"
+
+      - name: Update Pull Request title
+        run: |
+          pull_request_number=${{ github.event.pull_request.number }}
+          current_title="${{ github.event.pull_request.title }}"
+          
+          updated_title=$(python3 "./.github/pr_autorename.py" "$current_title")
+          token=${{ secrets.GITHUB_TOKEN }}
+          curl -X PATCH \
+            -H "Authorization: Bearer $token" \
+            -H "Accept: application/vnd.github.v3+json" \
+            "https://api.github.com/repos/${{ github.repository }}/pulls/$pull_request_number" \
+            -d '{ "title": "'"$updated_title"'" }'