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✏️ Editing: pipes.py

"""Conversion pipeline templates.

The problem:
------------

Suppose you have some data that you want to convert to another format,
such as from GIF image format to PPM image format.  Maybe the
conversion involves several steps (e.g. piping it through compress or
uuencode).  Some of the conversion steps may require that their input
is a disk file, others may be able to read standard input; similar for
their output.  The input to the entire conversion may also be read
from a disk file or from an open file, and similar for its output.

The module lets you construct a pipeline template by sticking one or
more conversion steps together.  It will take care of creating and
removing temporary files if they are necessary to hold intermediate
data.  You can then use the template to do conversions from many
different sources to many different destinations.  The temporary
file names used are different each time the template is used.

The templates are objects so you can create templates for many
different conversion steps and store them in a dictionary, for
instance.

Directions:
-----------

To create a template:
    t = Template()

To add a conversion step to a template:
   t.append(command, kind)
where kind is a string of two characters: the first is '-' if the
command reads its standard input or 'f' if it requires a file; the
second likewise for the output. The command must be valid /bin/sh
syntax.  If input or output files are required, they are passed as
$IN and $OUT; otherwise, it must be  possible to use the command in
a pipeline.

To add a conversion step at the beginning:
   t.prepend(command, kind)

To convert a file to another file using a template:
  sts = t.copy(infile, outfile)
If infile or outfile are the empty string, standard input is read or
standard output is written, respectively.  The return value is the
exit status of the conversion pipeline.

To open a file for reading or writing through a conversion pipeline:
   fp = t.open(file, mode)
where mode is 'r' to read the file, or 'w' to write it -- just like
for the built-in function open() or for os.popen().

To create a new template object initialized to a given one:
   t2 = t.clone()
"""                                     # '

import re
import os
import tempfile
import warnings
# we import the quote function rather than the module for backward compat
# (quote used to be an undocumented but used function in pipes)
from shlex import quote

warnings._deprecated(__name__, remove=(3, 13))

__all__ = ["Template"]

# Conversion step kinds

FILEIN_FILEOUT = 'ff'                   # Must read & write real files
STDIN_FILEOUT  = '-f'                   # Must write a real file
FILEIN_STDOUT  = 'f-'                   # Must read a real file
STDIN_STDOUT   = '--'                   # Normal pipeline element
SOURCE         = '.-'                   # Must be first, writes stdout
SINK           = '-.'                   # Must be last, reads stdin

stepkinds = [FILEIN_FILEOUT, STDIN_FILEOUT, FILEIN_STDOUT, STDIN_STDOUT, \
             SOURCE, SINK]

class Template:
    """Class representing a pipeline template."""

def __init__(self):
        """Template() returns a fresh pipeline template."""
        self.debugging = 0
        self.reset()

def __repr__(self):
        """t.__repr__() implements repr(t)."""
        return '<Template instance, steps=%r>' % (self.steps,)

def reset(self):
        """t.reset() restores a pipeline template to its initial state."""
        self.steps = []

def clone(self):
        """t.clone() returns a new pipeline template with identical
        initial state as the current one."""
        t = Template()
        t.steps = self.steps[:]
        t.debugging = self.debugging
        return t

def debug(self, flag):
        """t.debug(flag) turns debugging on or off."""
        self.debugging = flag

def append(self, cmd, kind):
        """t.append(cmd, kind) adds a new step at the end."""
        if not isinstance(cmd, str):
            raise TypeError('Template.append: cmd must be a string')
        if kind not in stepkinds:
            raise ValueError('Template.append: bad kind %r' % (kind,))
        if kind == SOURCE:
            raise ValueError('Template.append: SOURCE can only be prepended')
        if self.steps and self.steps[-1][1] == SINK:
            raise ValueError('Template.append: already ends with SINK')
        if kind[0] == 'f' and not re.search(r'\$IN\b', cmd):
            raise ValueError('Template.append: missing $IN in cmd')
        if kind[1] == 'f' and not re.search(r'\$OUT\b', cmd):
            raise ValueError('Template.append: missing $OUT in cmd')
        self.steps.append((cmd, kind))

def prepend(self, cmd, kind):
        """t.prepend(cmd, kind) adds a new step at the front."""
        if not isinstance(cmd, str):
            raise TypeError('Template.prepend: cmd must be a string')
        if kind not in stepkinds:
            raise ValueError('Template.prepend: bad kind %r' % (kind,))
        if kind == SINK:
            raise ValueError('Template.prepend: SINK can only be appended')
        if self.steps and self.steps[0][1] == SOURCE:
            raise ValueError('Template.prepend: already begins with SOURCE')
        if kind[0] == 'f' and not re.search(r'\$IN\b', cmd):
            raise ValueError('Template.prepend: missing $IN in cmd')
        if kind[1] == 'f' and not re.search(r'\$OUT\b', cmd):
            raise ValueError('Template.prepend: missing $OUT in cmd')
        self.steps.insert(0, (cmd, kind))

def open(self, file, rw):
        """t.open(file, rw) returns a pipe or file object open for
        reading or writing; the file is the other end of the pipeline."""
        if rw == 'r':
            return self.open_r(file)
        if rw == 'w':
            return self.open_w(file)
        raise ValueError('Template.open: rw must be \'r\' or \'w\', not %r'
                         % (rw,))

def open_r(self, file):
        """t.open_r(file) and t.open_w(file) implement
        t.open(file, 'r') and t.open(file, 'w') respectively."""
        if not self.steps:
            return open(file, 'r')
        if self.steps[-1][1] == SINK:
            raise ValueError('Template.open_r: pipeline ends width SINK')
        cmd = self.makepipeline(file, '')
        return os.popen(cmd, 'r')

def open_w(self, file):
        if not self.steps:
            return open(file, 'w')
        if self.steps[0][1] == SOURCE:
            raise ValueError('Template.open_w: pipeline begins with SOURCE')
        cmd = self.makepipeline('', file)
        return os.popen(cmd, 'w')

def copy(self, infile, outfile):
        return os.system(self.makepipeline(infile, outfile))

def makepipeline(self, infile, outfile):
        cmd = makepipeline(infile, self.steps, outfile)
        if self.debugging:
            print(cmd)
            cmd = 'set -x; ' + cmd
        return cmd

def makepipeline(infile, steps, outfile):
    # Build a list with for each command:
    # [input filename or '', command string, kind, output filename or '']

list = []
    for cmd, kind in steps:
        list.append(['', cmd, kind, ''])
    #
    # Make sure there is at least one step
    #
    if not list:
        list.append(['', 'cat', '--', ''])
    #
    # Take care of the input and output ends
    #
    [cmd, kind] = list[0][1:3]
    if kind[0] == 'f' and not infile:
        list.insert(0, ['', 'cat', '--', ''])
    list[0][0] = infile
    #
    [cmd, kind] = list[-1][1:3]
    if kind[1] == 'f' and not outfile:
        list.append(['', 'cat', '--', ''])
    list[-1][-1] = outfile
    #
    # Invent temporary files to connect stages that need files
    #
    garbage = []
    for i in range(1, len(list)):
        lkind = list[i-1][2]
        rkind = list[i][2]
        if lkind[1] == 'f' or rkind[0] == 'f':
            (fd, temp) = tempfile.mkstemp()
            os.close(fd)
            garbage.append(temp)
            list[i-1][-1] = list[i][0] = temp
    #
    for item in list:
        [inf, cmd, kind, outf] = item
        if kind[1] == 'f':
            cmd = 'OUT=' + quote(outf) + '; ' + cmd
        if kind[0] == 'f':
            cmd = 'IN=' + quote(inf) + '; ' + cmd
        if kind[0] == '-' and inf:
            cmd = cmd + ' <' + quote(inf)
        if kind[1] == '-' and outf:
            cmd = cmd + ' >' + quote(outf)
        item[1] = cmd
    #
    cmdlist = list[0][1]
    for item in list[1:]:
        [cmd, kind] = item[1:3]
        if item[0] == '':
            if 'f' in kind:
                cmd = '{ ' + cmd + '; }'
            cmdlist = cmdlist + ' |\n' + cmd
        else:
            cmdlist = cmdlist + '\n' + cmd
    #
    if garbage:
        rmcmd = 'rm -f'
        for file in garbage:
            rmcmd = rmcmd + ' ' + quote(file)
        trapcmd = 'trap ' + quote(rmcmd + '; exit') + ' 1 2 3 13 14 15'
        cmdlist = trapcmd + '\n' + cmdlist + '\n' + rmcmd
    #
    return cmdlist

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