From 1380c7df75d985f2c33306af8531da4a1c3bde31 Mon Sep 17 00:00:00 2001
From: Tobias Kessels <tobiasoliverkessels@bundeswehr.org>
Date: Thu, 1 Aug 2024 09:44:57 +0200
Subject: [PATCH] Add split_linewise.py

split_linewise.py splits large textfiles into smaller chunks, like 500MB for Uploading into splunk while also making sure each line stays intakt
---
 tools/split_linewise.py | 61 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100755 tools/split_linewise.py

diff --git a/tools/split_linewise.py b/tools/split_linewise.py
new file mode 100755
index 0000000..a7ff8c6
--- /dev/null
+++ b/tools/split_linewise.py
@@ -0,0 +1,61 @@
+#!/usr/bin/python3
+import os
+import sys
+import argparse
+
+
+def split_lines(input_file, chunk_size_mb=500):
+    """
+    Splits a file into chunks of size chunk_size_mb but preserves lines.
+
+    Args:
+      input_file (str): Path to the file that will be splitted into chunks.
+      chunk_size_mb (int, optional): Size of each chunk in MB. Defaults to 500.
+    """
+    chunk_size_bytes = chunk_size_mb * 1024 * 1024 # Convert to MB to bytes
+    current_chunk = 1
+    current_size = 0
+    output_file = None
+    # Try to extract original extension
+    file_extension = os.path.splitext(input_file)
+    if len(file_extension) == 2:
+        file_extension = file_extension[1]
+    else:
+        file_extension = ''
+
+    # Open the file and split it into chunks
+    with open(input_file, 'r') as infile:
+        for line in infile:
+            # Open new file if none exists or next line exceeds chunk size
+            if output_file is None or ((current_size + len(line.encode('utf-8'))) > chunk_size_bytes):
+                if output_file:
+                    output_file.close()
+                output_filename = f"{os.path.splitext(input_file)[0]}_chunk{current_chunk:03d}{file_extension}"
+                print(f"Created {output_filename}")
+                output_file = open(output_filename, 'w')
+                current_chunk += 1
+                current_size = 0
+            output_file.write(line)
+            current_size += len(line.encode('utf-8'))
+        
+        if output_file:
+            output_file.close()
+
+def parse_arguments():
+    """
+    Parses command line arguments.
+
+    Returns:
+    argparse.Namespace: The arguments passed to the command line.
+    """
+    parser = argparse.ArgumentParser(description='Split a text file into smaller chunks but keep lines intakt.')
+    parser.add_argument('input_file', type=str, help='The path to the input file to be split.')
+    parser.add_argument('--chunk_size_mb', type=int, default=500, help='Maximum chunk size in MB (default: 500).')
+    return parser.parse_args()
+
+def main():
+    args = parse_arguments()
+    split_lines(args.input_file, args.chunk_size_mb)
+
+if __name__ == '__main__':
+    main()