feat: Add merge_srt.py to merge SRT files using COPY commands from a file

merge_srt.py

@@ -0,0 +1,82 @@
+import sys
+
+def parse_srt(filename):
+    with open(filename, 'r', encoding='utf-8') as f:
+        content = f.read().strip()
+    blocks = content.split('\n\n')
+    entries = []
+    for block in blocks:
+        lines = block.split('\n')
+        if len(lines) < 3:
+            continue
+        index = int(lines[0])
+        timestamp = lines[1]
+        text = '\n'.join(lines[2:]).strip()
+        entries.append({
+            'index': index,
+            'timestamp': timestamp,
+            'text': text,
+        })
+    return entries
+
+def read_commands(filename):
+    with open(filename, 'r', encoding='utf-8') as f:
+        lines = f.readlines()
+    commands = []
+    for line in lines:
+        line = line.strip()
+        if not line or line.startswith('#'):
+            continue
+        parts = line.split()
+        if len(parts) != 3:
+            continue
+        command = parts[0].upper()
+        if command != 'COPY':
+            continue
+        try:
+            source = int(parts[1])
+            if source not in (1, 2):
+                continue
+            range_part = parts[2]
+            start_str, end_str = range_part.split('-')
+            start = int(start_str)
+            end = int(end_str)
+            if start > end:
+                continue
+        except (ValueError, AttributeError):
+            continue
+        commands.append((source, start, end))
+    return commands
+
+if __name__ == '__main__':
+    if len(sys.argv) != 5:
+        print("Usage: python merge_srt.py <srt1> <srt2> <commands> <output>")
+        sys.exit(1)
+    srt1_filename = sys.argv[1]
+    srt2_filename = sys.argv[2]
+    commands_filename = sys.argv[3]
+    output_filename = sys.argv[4]
+
+    srt1 = parse_srt(srt1_filename)
+    srt2 = parse_srt(srt2_filename)
+    commands = read_commands(commands_filename)
+
+    output = []
+    for source, start, end in commands:
+        source_list = srt1 if source == 1 else srt2
+        start_idx = start - 1
+        end_idx = end - 1
+        if start_idx < 0 or end_idx >= len(source_list) or start_idx > end_idx:
+            print(f"Skipping invalid command: source {source}, range {start}-{end}")
+            continue
+        entries = source_list[start_idx:end_idx + 1]
+        output.extend(entries)
+
+    with open(output_filename, 'w', encoding='utf-8') as f:
+        for i, entry in enumerate(output, start=1):
+            f.write(f"{i}\n")
+            f.write(entry['timestamp'] + '\n')
+            text = entry['text'].strip()
+            for line in text.split('\n'):
+                f.write(line + '\n')
+            f.write('\n')