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a ]�h�! � @ s~ d dl Z d dlZd dlZejdk r&eZG dd� de�Zddd�Zddd �Z dd d �Z d d� Z dd� Z dd� Z edkrze � dS )� N)� c @ s� e Zd ZdZdZd!dd�Zdd� Zd d � Zd"d d �Zd#dd�Z dd� Z dd� Z d$dd�Z d%dd�Z d&dd �Zd d � Zd d � ZdS )'�TailerzZ Implements tailing and heading functionality like GNU tail and head commands. )� � � � Fc C s( || _ || _| j�� | _|r$| �� d S �N)� read_size�file�tell� start_pos�seek_end)�selfr r �end� r �/root/rpmbuild/BUILDROOT/imh-python39-modules-3.9.7-92.el8.x86_64/opt/imh-python/lib/python3.9/site-packages/tailer/__init__.py�__init__ s zTailer.__init__c C s t �d�| j�|�S )N�|)�re�split�join�line_terminators)r �datar r r � splitlines s zTailer.splitlinesc C s | � dd� d S )Nr � )�seek�r r r r r s zTailer.seek_endr c C s | j �||� d S r )r r )r �pos�whencer r r r s z Tailer.seekNc C s( |r| j �|�}n | j �� }t|�|fS r )r �read�len)r r �read_strr r r r s z Tailer.readc C s� | j �� }}| �| j�\}}d}|r<|d | jv r<|d7 }|dkr�|}||k r�|| | jv rz| �|| d � | j �� S |d7 }qH|| j7 }| �|� | �| j�\}}q<dS )z� Searches forward from the current file position for a line terminator and seeks to the charachter after it. r � N)r r r r r r )r r r � bytes_readr! �start�ir r r �seek_line_forward' s zTailer.seek_line_forwardc C s | j �� }}| j}||kr&||8 }nd}|}| �|� | �|�\}}|r�|d | jv r�|d8 }|dd� dkr�d| jv r�|d8 }|dk�r|d }|dkr�|| | jv r�| �|| d � | j �� S |d8 }q�|dks�|| j dk r�| �d� dS || j8 }| �|� | �| j�\}}q�dS )z� Searches backwards from the current file position for a line terminator and seeks to the charachter after it. r ���r" ���Nr )r r r r r r )r r �end_posr r# r! r% r r r � seek_lineE s4 zTailer.seek_line� c C s\ | � � | j�� }t|�D ]}| �� s q,q| j�|| j�� d �}|rT| �|�S g S dS )z3 Return the last lines of the file. r" N)r r r �ranger* r r )r �linesr) r% r r r r �tailt s z Tailer.tailc C s^ | � d� t|�D ]}| �� s q$q| j�� }| � d� | j�|d �}|rV| �|�S g S dS )z2 Return the top lines of the file. r r" N)r r, r& r r r r )r r- r% r) r r r r �head� s z Tailer.head� �?c c s� d}| j �� }| j �� }|r||r0|| jv r0d}q|d | jv rp|dd� }|dd� dkrpd| jv rp|dd� }d}|V qd}| �|� t�|� qdS )z� Iterator generator that returns lines as data is added to the file. Based on: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/157035 TFr' Nr )r r �readliner r �time�sleep)r �delayZtrailing�where�liner r r �follow� s z Tailer.followc C s | � � S r )r7 r r r r �__iter__� s zTailer.__iter__c C s | j �� d S r )r �closer r r r r9 � s z Tailer.close)r F)r )N)r+ )r+ )r0 )�__name__� __module__� __qualname__�__doc__r r r r r r r& r* r. r/ r7 r8 r9 r r r r r s / r r+ c C s t | ��|�S )a; Return the last lines of the file. >>> try: ... from StringIO import StringIO ... except ImportError: ... from io import StringIO >>> f = StringIO() >>> for i in range(11): ... _ = f.write('Line %d\n' % (i + 1)) >>> tail(f, 3) ['Line 9', 'Line 10', 'Line 11'] )r r. �r r- r r r r. � s r. c C s t | ��|�S )a8 Return the top lines of the file. >>> try: ... from StringIO import StringIO ... except ImportError: ... from io import StringIO >>> f = StringIO() >>> for i in range(11): ... _ = f.write('Line %d\n' % (i + 1)) >>> head(f, 3) ['Line 1', 'Line 2', 'Line 3'] )r r/ r> r r r r/ � s r/ r0 c C s t | dd��|�S )a� Iterator generator that returns lines as data is added to the file. >>> import os >>> f = open('test_follow.txt', 'w') >>> fo = open('test_follow.txt', 'r') >>> generator = follow(fo) >>> _ = f.write('Line 1\n') >>> f.flush() >>> next(generator) 'Line 1' >>> _ = f.write('Line 2\n') >>> f.flush() >>> next(generator) 'Line 2' >>> f.close() >>> fo.close() >>> os.remove('test_follow.txt') T)r )r r7 )r r4 r r r r7 � s r7 c C s dd l } | �� d S )Nr )�doctest�testmod)r? r r r �_test� s rA c C s� t t| d��}z�z�|jdkrl|jrL|jr>tj�d� t�d� |�|j�}n |� |j�}|D ] }t |� q\n|jrz|� � |jr�|j|j d�D ] }t |� q�W n t y� Y n0 W |�� n |�� 0 d S )N�rbr z Cannot follow from top of file. r" )r4 )r �openr- r/ r7 �sys�stderr�write�exitr. �printr r3 �KeyboardInterruptr9 )�filepath�optionsZtailerr- r6 r r r �_main� s( rL c C s� ddl m} dd l}| dd�}|jddddd d d � |jd d ddddd� |jddddd dd � |jdddddd d d � |jd d d!dd d"d � |�� \}}|jr�t� n.t|�d#ks�|�� |� d#� nt |d |� d S )$Nr )� OptionParserz usage: %prog [options] filename)�usagez-fz--followr7 F� store_truez)output appended data as the file grows)�dest�default�action�helpz-nz--linesr- r+ �intz/output the last N lines, instead of the last 10)rP rQ �typerS z-tz--topr/ zJoutput lines from the top instead of the bottom. Does not work with followz-sz--sleep-intervalr3 r0 �S�floatzCwith -f, sleep for approximately S seconds between iterations)rP rQ �metavarrU rS � z--test�testzRun some basic testsr" ) �optparserM rD � add_option� parse_argsrZ rA r � print_helprG rL )rM rD �parserrK �argsr r r �main s2 ����� ra �__main__)r+ )r+ )r0 )r rD r2 � version_info�xranger, �objectr r. r/ r7 rA rL ra r: r r r r �<module> s 7
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