Add first draft of command diff workflow

Author: joshuacwnewton

.github/workflows/compare_script_to_course.yml

@@ -0,0 +1,53 @@
+name: Compare SCT Commands
+
+on:
+  workflow_dispatch:
+    inputs:
+      text_url:
+        description: "URL to text file (e.g. GitHub raw gist link)"
+        required: true
+        type: string
+
+jobs:
+  compare:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@v4
+
+      - name: Install Python (for parsing script)
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Download remote text file
+        run: |
+          curl -L "${{ github.event.inputs.text_url }}" -o remote.txt
+          echo "✅ Downloaded remote file:"
+          wc -l remote.txt
+
+      - name: Extract commands from remote file
+        run: |
+          python3 .github/workflows/scripts/extract_sct.py remote.txt -o remote_cmds.txt
+          sort -u remote_cmds.txt > remote_cmds_sorted.txt
+          echo "✅ Extracted $(wc -l < remote_cmds_sorted.txt) commands from remote file"
+
+      - name: Extract commands from local batch script
+        run: |
+          python3 .github/workflows/scripts/extract_sct.py single_subject/batch_single_subject.sh -o local_cmds.txt
+          sort -u local_cmds.txt > local_cmds_sorted.txt
+          echo "✅ Extracted $(wc -l < local_cmds_sorted.txt) commands from local script"
+
+      - name: Diff commands
+        run: |
+          echo "🔍 Diffing remote vs local..."
+          diff -u local_cmds_sorted.txt remote_cmds_sorted.txt || true
+
+      - name: Upload results as artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: command-diff-output
+          path: |
+            remote_cmds_sorted.txt
+            local_cmds_sorted.txt

.github/workflows/scripts/extract_sct.py

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+import argparse
+from pathlib import Path
+
+
+def extract_sct_commands(paths, output=None):
+    results = []
+
+    for path in paths:
+        with open(path, "r", encoding="utf-8") as f:
+            for line in f:
+                stripped = line.lstrip()
+                if stripped.startswith("sct_"):
+                    results.append(stripped.rstrip())
+
+    if output:
+        Path(output).write_text("\n".join(results), encoding="utf-8")
+    else:
+        print("\n".join(results))
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="Extract SCT commands "
+                                                 "from TXT files.")
+    parser.add_argument("files", nargs="+", help="Input text files")
+    parser.add_argument("-o", "--output", help="Optional output file")
+    args = parser.parse_args()
+
+    extract_sct_commands(args.files, args.output)