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Name	Type	Size	Permissions	Modified	Actions
..	Parent	-	drwxr-xr-x	2026-07-16 05:15:30	-
__phello__	Folder	-	0755	2026-07-16 05:15:30
__pycache__	Folder	-	0755	2026-07-16 05:15:30
asyncio	Folder	-	0755	2026-07-16 05:15:30
collections	Folder	-	0755	2026-07-16 05:15:30
concurrent	Folder	-	0755	2026-07-16 05:15:30
config-3.12-x86_64-linux-gnu	Folder	-	0755	2026-07-16 05:15:30
ctypes	Folder	-	0755	2026-07-16 05:15:30
curses	Folder	-	0755	2026-07-16 05:15:30
dbm	Folder	-	0755	2026-07-16 05:15:30
email	Folder	-	0755	2026-07-16 05:15:30
encodings	Folder	-	0755	2026-07-16 05:15:30
ensurepip	Folder	-	0755	2026-07-16 05:15:30
html	Folder	-	0755	2026-07-16 05:15:30
http	Folder	-	0755	2026-07-16 05:15:30
importlib	Folder	-	0755	2026-07-16 05:15:30
json	Folder	-	0755	2026-07-16 05:15:30
lib-dynload	Folder	-	0755	2026-07-16 05:15:32
logging	Folder	-	0755	2026-07-16 05:15:30
multiprocessing	Folder	-	0755	2026-07-16 05:15:30
pydoc_data	Folder	-	0755	2026-07-16 05:15:30
re	Folder	-	0755	2026-07-16 05:15:30
sqlite3	Folder	-	0755	2026-07-16 05:15:30
test	Folder	-	0755	2026-07-16 05:15:30
tomllib	Folder	-	0755	2026-07-16 05:15:30
unittest	Folder	-	0755	2026-07-16 05:15:30
urllib	Folder	-	0755	2026-07-16 05:15:30
venv	Folder	-	0755	2026-07-16 05:15:30
wsgiref	Folder	-	0755	2026-07-16 05:15:30
xml	Folder	-	0755	2026-07-16 05:15:30
xmlrpc	Folder	-	0755	2026-07-16 05:15:30
zipfile	Folder	-	0755	2026-07-16 05:15:30
zoneinfo	Folder	-	0755	2026-07-16 05:15:30
EXTERNALLY-MANAGED	File	645 B	0644	2026-06-19 12:46:00
LICENSE.txt	File	13.61 KB	0644	2026-06-19 12:46:00
__future__.py	File	5.1 KB	0644	2026-06-19 12:46:00
__hello__.py	File	227 B	0644	2026-06-19 12:46:00
_aix_support.py	File	3.93 KB	0644	2026-06-19 12:46:00
_collections_abc.py	File	31.33 KB	0644	2026-06-19 12:46:00
_compat_pickle.py	File	8.56 KB	0644	2026-06-19 12:46:00
_compression.py	File	5.55 KB	0644	2026-06-19 12:46:00
_distutils_system_mod.py	File	5.58 KB	0644	2026-06-19 12:46:00
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_osx_support.py	File	21.51 KB	0644	2026-06-19 12:46:00
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_sysconfigdata__linux_x86_64-linux-gnu.py	File	48.34 KB	0644	2026-06-19 12:46:00
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_threading_local.py	File	7.05 KB	0644	2026-06-19 12:46:00
_weakrefset.py	File	5.75 KB	0644	2026-06-19 12:46:00
abc.py	File	6.38 KB	0644	2026-06-19 12:46:00
aifc.py	File	33.41 KB	0644	2026-06-19 12:46:00
antigravity.py	File	500 B	0644	2026-06-19 12:46:00
argparse.py	File	99.37 KB	0644	2026-06-19 12:46:00
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base64.py	File	20.12 KB	0755	2026-07-16 05:15:22
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bisect.py	File	3.34 KB	0644	2026-06-19 12:46:00
bz2.py	File	11.57 KB	0644	2026-06-19 12:46:00
cProfile.py	File	6.4 KB	0755	2026-07-16 05:15:22
calendar.py	File	24.82 KB	0644	2026-06-19 12:46:00
cgi.py	File	33.61 KB	0755	2026-07-16 05:15:22
cgitb.py	File	12.13 KB	0644	2026-06-19 12:46:00
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codecs.py	File	36.01 KB	0644	2026-06-19 12:46:00
codeop.py	File	5.77 KB	0644	2026-06-19 12:46:00
colorsys.py	File	3.97 KB	0644	2026-06-19 12:46:00
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configparser.py	File	52.53 KB	0644	2026-06-19 12:46:00
contextlib.py	File	26.99 KB	0644	2026-06-19 12:46:00
contextvars.py	File	129 B	0644	2026-06-19 12:46:00
copy.py	File	8.21 KB	0644	2026-06-19 12:46:00
copyreg.py	File	7.44 KB	0644	2026-06-19 12:46:00
crypt.py	File	3.82 KB	0644	2026-06-19 12:46:00
csv.py	File	16 KB	0644	2026-06-19 12:46:00
dataclasses.py	File	60.31 KB	0644	2026-06-19 12:46:00
datetime.py	File	268 B	0644	2026-06-19 12:46:00
decimal.py	File	320 B	0644	2026-06-19 12:46:00
difflib.py	File	81.36 KB	0644	2026-06-19 12:46:00
dis.py	File	29.5 KB	0644	2026-06-19 12:46:00
doctest.py	File	103.98 KB	0644	2026-06-19 12:46:00
enum.py	File	79.72 KB	0644	2026-06-19 12:46:00
filecmp.py	File	9.95 KB	0644	2026-06-19 12:46:00
fileinput.py	File	15.35 KB	0644	2026-06-19 12:46:00
fnmatch.py	File	5.86 KB	0644	2026-06-19 12:46:00
fractions.py	File	37.17 KB	0644	2026-06-19 12:46:00
ftplib.py	File	34.41 KB	0644	2026-06-19 12:46:00
functools.py	File	37.23 KB	0644	2026-06-19 12:46:00
genericpath.py	File	5.44 KB	0644	2026-06-19 12:46:00
getopt.py	File	7.31 KB	0644	2026-06-19 12:46:00
getpass.py	File	5.85 KB	0644	2026-06-19 12:46:00
gettext.py	File	21.24 KB	0644	2026-06-19 12:46:00
glob.py	File	8.53 KB	0644	2026-06-19 12:46:00
graphlib.py	File	9.43 KB	0644	2026-06-19 12:46:00
gzip.py	File	24.28 KB	0644	2026-06-19 12:46:00
hashlib.py	File	9.13 KB	0644	2026-06-19 12:46:00
heapq.py	File	22.48 KB	0644	2026-06-19 12:46:00
hmac.py	File	7.54 KB	0644	2026-06-19 12:46:00
imaplib.py	File	52.43 KB	0644	2026-06-19 12:46:00
imghdr.py	File	4.29 KB	0644	2026-06-19 12:46:00
inspect.py	File	122.48 KB	0644	2026-06-19 12:46:00
io.py	File	3.5 KB	0644	2026-06-19 12:46:00
ipaddress.py	File	76.46 KB	0644	2026-06-19 12:46:00
keyword.py	File	1.05 KB	0644	2026-06-19 12:46:00
linecache.py	File	5.52 KB	0644	2026-06-19 12:46:00
locale.py	File	76.72 KB	0644	2026-06-19 12:46:00
lzma.py	File	12.97 KB	0644	2026-06-19 12:46:00
mailbox.py	File	77.06 KB	0644	2026-06-19 12:46:00
mailcap.py	File	9.11 KB	0644	2026-06-19 12:46:00
mimetypes.py	File	22.35 KB	0644	2026-06-19 12:46:00
modulefinder.py	File	23.14 KB	0644	2026-06-19 12:46:00
netrc.py	File	6.76 KB	0644	2026-06-19 12:46:00
nntplib.py	File	40.12 KB	0644	2026-06-19 12:46:00
ntpath.py	File	29.32 KB	0644	2026-06-19 12:46:00
nturl2path.py	File	2.82 KB	0644	2026-06-19 12:46:00
numbers.py	File	11.2 KB	0644	2026-06-19 12:46:00
opcode.py	File	12.87 KB	0644	2026-06-19 12:46:00
operator.py	File	10.71 KB	0644	2026-06-19 12:46:00
optparse.py	File	58.95 KB	0644	2026-06-19 12:46:00
os.py	File	38.85 KB	0644	2026-06-19 12:46:00
pathlib.py	File	49.95 KB	0644	2026-06-19 12:46:00
pdb.py	File	67.83 KB	0755	2026-07-16 05:15:22
pickle.py	File	63.38 KB	0644	2026-06-19 12:46:00
pickletools.py	File	91.66 KB	0644	2026-06-19 12:46:00
pipes.py	File	8.77 KB	0644	2026-06-19 12:46:00
pkgutil.py	File	17.85 KB	0644	2026-06-19 12:46:00
platform.py	File	42.32 KB	0755	2026-07-16 05:15:22
plistlib.py	File	27.91 KB	0644	2026-06-19 12:46:00
poplib.py	File	13.83 KB	0644	2026-06-19 12:46:00
posixpath.py	File	17.21 KB	0644	2026-06-19 12:46:00
pprint.py	File	23.59 KB	0644	2026-06-19 12:46:00
profile.py	File	22.55 KB	0755	2026-07-16 05:15:22
pstats.py	File	28.6 KB	0644	2026-06-19 12:46:00
pty.py	File	5.99 KB	0644	2026-06-19 12:46:00
py_compile.py	File	7.69 KB	0644	2026-06-19 12:46:00
pyclbr.py	File	11.13 KB	0644	2026-06-19 12:46:00
pydoc.py	File	110.44 KB	0755	2026-07-16 05:15:22
queue.py	File	11.23 KB	0644	2026-06-19 12:46:00
quopri.py	File	7.02 KB	0755	2026-07-16 05:15:22
random.py	File	33.87 KB	0644	2026-06-19 12:46:00
reprlib.py	File	6.42 KB	0644	2026-06-19 12:46:00
rlcompleter.py	File	7.64 KB	0644	2026-06-19 12:46:00
runpy.py	File	12.6 KB	0644	2026-06-19 12:46:00
sched.py	File	6.2 KB	0644	2026-06-19 12:46:00
secrets.py	File	1.94 KB	0644	2026-06-19 12:46:00
selectors.py	File	19.21 KB	0644	2026-06-19 12:46:00
shelve.py	File	8.36 KB	0644	2026-06-19 12:46:00
shlex.py	File	13.04 KB	0644	2026-06-19 12:46:00
shutil.py	File	56.76 KB	0644	2026-06-19 12:46:00
signal.py	File	2.44 KB	0644	2026-06-19 12:46:00
site.py	File	23.34 KB	0644	2026-06-19 12:46:00
smtplib.py	File	42.51 KB	0755	2026-07-16 05:15:22
sndhdr.py	File	7.27 KB	0644	2026-06-19 12:46:00
socket.py	File	36.53 KB	0644	2026-06-19 12:46:00
socketserver.py	File	27.2 KB	0644	2026-06-19 12:46:00
sre_compile.py	File	231 B	0644	2026-06-19 12:46:00
sre_constants.py	File	232 B	0644	2026-06-19 12:46:00
sre_parse.py	File	229 B	0644	2026-06-19 12:46:00
ssl.py	File	49.63 KB	0644	2026-06-19 12:46:00
stat.py	File	5.36 KB	0644	2026-06-19 12:46:00
statistics.py	File	49.05 KB	0644	2026-06-19 12:46:00
string.py	File	11.51 KB	0644	2026-06-19 12:46:00
stringprep.py	File	12.61 KB	0644	2026-06-19 12:46:00
struct.py	File	257 B	0644	2026-06-19 12:46:00
subprocess.py	File	86.65 KB	0644	2026-06-19 12:46:00
sunau.py	File	18.04 KB	0644	2026-06-19 12:46:00
symtable.py	File	10.5 KB	0644	2026-06-19 12:46:00
sysconfig.py	File	32 KB	0644	2026-06-19 12:46:00
tabnanny.py	File	11.26 KB	0755	2026-07-16 05:15:22
tarfile.py	File	111.18 KB	0755	2026-07-16 05:15:22
telnetlib.py	File	22.75 KB	0644	2026-06-19 12:46:00
tempfile.py	File	36.46 KB	0644	2026-06-19 12:46:00
textwrap.py	File	19.26 KB	0644	2026-06-19 12:46:00
this.py	File	1003 B	0644	2026-06-19 12:46:00
threading.py	File	58.71 KB	0644	2026-06-19 12:46:00
timeit.py	File	13.15 KB	0755	2026-07-16 05:15:22
token.py	File	2.42 KB	0644	2026-06-19 12:46:00
tokenize.py	File	20.72 KB	0644	2026-06-19 12:46:00
trace.py	File	28.5 KB	0755	2026-07-16 05:15:22
traceback.py	File	45.24 KB	0644	2026-06-19 12:46:00
tracemalloc.py	File	17.62 KB	0644	2026-06-19 12:46:00
tty.py	File	1.99 KB	0644	2026-06-19 12:46:00
turtle.py	File	142.93 KB	0644	2026-06-19 12:46:00
types.py	File	10.74 KB	0644	2026-06-19 12:46:00
typing.py	File	114.68 KB	0644	2026-06-19 12:46:00
uu.py	File	7.19 KB	0755	2026-07-16 05:15:22
uuid.py	File	28.96 KB	0644	2026-06-19 12:46:00
warnings.py	File	21.25 KB	0644	2026-06-19 12:46:00
wave.py	File	22.24 KB	0644	2026-06-19 12:46:00
weakref.py	File	21.01 KB	0644	2026-06-19 12:46:00
webbrowser.py	File	23.56 KB	0755	2026-07-16 05:15:22
xdrlib.py	File	5.8 KB	0644	2026-06-19 12:46:00
zipapp.py	File	7.37 KB	0644	2026-06-19 12:46:00
zipimport.py	File	27.47 KB	0644	2026-06-19 12:46:00

"""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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