112 lines
3.2 KiB
Python
112 lines
3.2 KiB
Python
#!/usr/bin/env python3
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# ollie:parallel read
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# ollie:tier cold
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# description: Read a file with accurate line numbers. Prefer segments (start/end) over full-file reads.
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# Args: <file_path> [start] [end] [--head=<n>]
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import sys
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import os
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from itertools import islice
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MAX_LINES = 500 # default window for whole-file reads (no start/end)
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MAX_SEGMENT = 2000 # max window when start/end are given
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MAX_LINE_LEN = 2000
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# Parse --head=N from args
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head = None
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args = []
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for a in sys.argv[1:]:
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if a.startswith('--head='):
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head = int(a.split('=', 1)[1])
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else:
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args.append(a)
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if not args:
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print("usage: file_read <file_path> [start] [end] [--head=N]")
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sys.exit(1)
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file_path = args[0]
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start = int(args[1]) if len(args) > 1 else 1
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end = int(args[2]) if len(args) > 2 else None
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if not os.path.isabs(file_path):
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print(f"STATUS=error")
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print(f"error: path must be absolute, got: {file_path}")
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sys.exit(1)
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if not os.path.exists(file_path):
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print("STATUS=not_found")
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print("(new file)")
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sys.exit(0)
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if not os.path.isfile(file_path):
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print(f"STATUS=error")
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print(f"error: not a regular file: {file_path}")
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sys.exit(1)
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with open(file_path, 'rb') as f:
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raw_head = f.read(8192)
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if b'\x00' in raw_head:
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# Binary file -- try to detect image type
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IMAGE_SIGS = [
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b'\x89PNG\r\n\x1a\n', b'\xff\xd8\xff',
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b'GIF87a', b'GIF89a', b'RIFF',
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]
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is_image = any(raw_head.startswith(s) for s in IMAGE_SIGS)
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if is_image:
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print("STATUS=ok BINARY=true IMAGE=true")
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print("(image file — use image_read for visual content)")
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else:
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print("STATUS=ok BINARY=true")
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print("(binary file)")
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sys.exit(0)
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# Count total lines
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try:
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with open(file_path, 'r', encoding='utf-8') as f:
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total_lines = sum(1 for _ in f)
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except UnicodeDecodeError:
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with open(file_path, 'r', encoding='utf-8', errors='replace') as f:
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total_lines = sum(1 for _ in f)
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start = max(1, start)
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if head:
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end = start + head - 1
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elif end is None:
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end = start + MAX_LINES - 1
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else:
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end = min(end, start + MAX_SEGMENT - 1)
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try:
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with open(file_path, 'r', encoding='utf-8') as f:
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for _ in islice(f, start - 1):
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pass
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segment_lines = list(islice(f, end - start + 1))
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except UnicodeDecodeError:
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with open(file_path, 'r', encoding='utf-8', errors='replace') as f:
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for _ in islice(f, start - 1):
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pass
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segment_lines = list(islice(f, end - start + 1))
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if not segment_lines:
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if start == 1:
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print(f"STATUS=ok LINES=0 TOTAL_LINES={total_lines} TRUNCATED=false EMPTY=true")
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print("(empty file)")
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else:
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print(f"STATUS=ok LINES=0 TOTAL_LINES={total_lines} TRUNCATED=false EMPTY=true")
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print("(no lines in range)")
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sys.exit(0)
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out = []
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for i, line in enumerate(segment_lines):
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lineno = start + i
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text = line.rstrip('\n')
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if len(text) > MAX_LINE_LEN:
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text = text[:MAX_LINE_LEN] + '...'
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out.append(f"{lineno:>6}\t{text}")
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last_line_shown = start + len(out) - 1
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truncated = last_line_shown < total_lines
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print(f"STATUS=ok LINES={len(out)} TOTAL_LINES={total_lines} TRUNCATED={str(truncated).lower()}")
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print('\n'.join(out))
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