ci: Add /demo command

Author: amis92

.github/workflows/chatops.yml

@@ -17,5 +17,9 @@ jobs:
                 "command": "tag",
                 "permission": "admin",
                 "named_args": true
+              },
+              {
+                "command": "demo",
+                "permission": "read"
               }
             ]

.github/workflows/demo-command.yml

@@ -0,0 +1,90 @@
+name: Demo command
+# trigger by chatops '/demo' followed by a PowerShell script in the comment body
+# example:
+# /demo
+# ```powershell
+# Write-Host "shows up in a log"
+# ```
+on:
+  repository_dispatch:
+    types: [demo-command]
+jobs:
+  run-demo:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Add run link to command comment
+        uses: peter-evans/create-or-update-comment@v1
+        with:
+          comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
+          body: '[Workflow run](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})'
+      - name: Get script text
+        uses: Amadevus/pwsh-script@v1
+        id: get-script-text
+        with:
+          script: |
+            # get body lines, skip first (command)
+            $bodyLines = $github.event.client_payload.github.payload.comment.body -split '\r?\n' | Select-Object -SkipFirst 1
+            $body = $bodyLines -join "`n"
+            $md = ConvertFrom-Markdown $body
+            using namespace Markdig.Syntax
+            $codeBlocks = [MarkdownObjectExtensions]::Descendants($md.Tokens) | Where-Object { $_ -is [CodeBlock] }
+            if ($codeBlocks) {
+              $scriptAst = $codeBlocks | Select-Object -First 1
+              $script = $scriptAst.Lines.ToString()
+            }
+            else {
+              $script = $body
+            }
+            # construct safe github ctx without token
+            $githubSafe = $github.Clone()
+            $githubSafe.Remove('token')
+            Set-ActionOutput githubSafe $githubSafe
+            return $script
+      - name: Execute user script
+        uses: Amadevus/pwsh-script@v1
+        id: user-script
+        with:
+          github: ${{ steps.get-script-text.outputs.githubSafe }}
+          script: ${{ steps.get-script-text.outputs.result }}
+      - name: Prettify result json
+        uses: Amadevus/pwsh-script@v1
+        id: pretty-result
+        env:
+          RESULT_JSON: ${{ steps.user-script.outputs.result }}
+        with:
+          script: |
+            $result = $env:RESULT_JSON
+            if ($result -and $result -match '^[\[\{]') {
+              try {
+                return ConvertFrom-Json $result -AsHashtable -NoEnumerate | ConvertTo-Json -Depth 100
+              }
+              catch {
+                Write-Host "Error converting, fallback to returning plain result"
+              }
+            }
+            return $result
+      - name: Comment with script result in code fence
+        uses: peter-evans/create-or-update-comment@v1
+        if: always()
+        with:
+          issue-number: ${{ github.event.client_payload.github.payload.issue.number }}
+          body: |
+            `result` output:
+            ```
+            ${{ steps.pretty-result.outputs.result }}
+            ```
+            `error` output:
+            ```
+            ${{ steps.user-script.outputs.error }}
+            ```
+      - name: Add reaction to command comment on success
+        uses: peter-evans/create-or-update-comment@v1
+        with:
+          comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
+          reactions: hooray
+      - name: Add reaction to command comment on failure
+        uses: peter-evans/create-or-update-comment@v1
+        if: failure()
+        with:
+          comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
+          reactions: "-1"