Rename 22.12.0

Description:

rename 22.12.0

rename

Renames files using regular expression matching. This enables elegant handling
of multiple renames using a single command.
Table of Contents

Installation
Usage
Options
License

Installation
The script is a single file that will work with any Python 3.7+. If you
prefer, install with:
console pip install rename
There used to be a version compatible with Python 2.4 - 2.7. To use that
one, install rename==1.2.
Usage
Basic syntax:
rename [-I] [-l] [-q] [-t] [-u] [-v "except_regex"] "regex" "target"

rename -s [-I] [-l] [-q] [-t] [-u] [-v "except_regex"] "substring_from" "substring_to" "regex"

rename --selftest [directory]

Options
regex
Regular expression that matches source files which are to be renamed. Examples:
"(\w+).caf"
"IMG(\d\d\d\d\).[Jj][Pp][Ee]?[Gg]"
"([0-9]{2})-([0-9]{2})-([12][0-9]{3}).log"

The regular expression is global by default (e.g. writing "[0-9]" means
"^[0-9]$"). This is to avoid accidental partial catches. If you want to match
all files that start or end with a specific expression, add .* to the
expression, e.g. ".*\.mp3" will match all files that end with .mp3. While
that may seem a bit redundant, it's on par with "explicit is better than
inplicit". See also: -I.
Note: the regex is case-sensitive, also on case-preserving filesystems. If
you wish to change that, use the -I option.
target
Name of the target file with references to regular expression groups caught in
the source matches. References to groups are formed by a backslash character
followed by he group number. Groups are indexed from 1. The group number can be
contained within parentheses to disambiguate a reference followed by digits.
Examples:
"\1.aiff"
"\(1)1337.zip"
"\3-\1-\2.log"

Automatic numbering can be introduced using a special \(index) reference.
For example:
rename "IMG.*\.JPG" "Judy's Birthday \(index).jpg"

By default indexing starts with 1, increments with 1 and pads numbers with
enough leading zeroes so that each filename uses the same amount of digits.
This can be changed with the --index-first, --index-step,
--index-digits and --index-pad-with options.
substring_from, substring_to
When using the "simple" mode (-s), these arguments provide the traditional
search/replace pattern:

substring_from is a simple (raw) substring that should be found within
the filename

substring_to is the replacement string

Both of these strings are raw, e.g. they don't allow for any wildcards, regular
expressions and whatnot. This is more-less compatible with behavior of the
existing rename tool from the util-linux-ng package. One obvious
difference is that the file mask doesn't use wildcards but regular expressions.
Example (translating underscores to spaces):
rename -s "_" " " ".*\.txt"

Note: substring_from is case-sensitive, also on case-preserving
filesystems. If you wish to change that, use the -I option.
substring_to is always case-sensitive.
-I, or --case-insensitive
When used, regexes work in a case-insensitive manner, e.g. "lib" will behave
like "[Ll][Ii][Bb]". Group references still hold the original case.
-l, or --lower
When used, renamed filenames are transformed to lower-case. This does not affect
the source regex used (i.e. it still matches in a case-sensitive manner, unless
-I is used). See also: -U.
-q, or --quiet
When used, no error output is given. The status of invocation should be
determined via the return code.
-s, or --simple
Invokes the "simple" mode. See: substring_from, substring_to.
-t, or --test
When used, the script will only fake renaming and verbosely state what it would
do. Use this if you're unsure of the effects your expression may cause.
-U, or --upper
When used, renamed filenames are transformed to upper-case. This does not affect
the source regex used (i.e. it still matches in a case-sensitive manner, unless
-I is used). See also: -l.
-v "except_regex", or --except "except_regex"
When used, any filename matched by the original source regex will be also
matched against the except_regex. In case there is a match, the filename is
skipped. In other words, filenames that match except_regex will not be
renamed.
The regular expression is local (e.g. writing "[0-3]" means "number
0-3 anywhere in the filename). This is to make the tool err on the side of
caution by protecting from renaming too many files by accident when the user
forgets to add dot-asterisk to -v. If you want to only match whole
filenames, use the canonical global form (e.g. "^filename$").
Why -v? Because grep -v.
See also: -I.
--index-first
When using the special \(index) reference, this option specifies what number
will the first index be. Default: --index-first=1.
--index-step
When using the special \(index) reference, this option specifies what number
will be added with each step to the first value. The specified number can be
negative. Default: --index-step=1.
--index-digits
When using the special \(index) reference, this option specifies how many
digits will be used in each reference. If a number has fewer digits, they will
be prefixed by leading zeroes (or another character, see: --index-pad-with).
A special value of auto can be used to automatically pad enough digits so
that each filename has the same amount of them used. This is useful for ensuring
your files will be sorted correctly even by dumb algorithms. Default:
--index-digits=auto.
--index-pad-with
When using the special \(index) reference, this option specifies what
character will be used for padding. Default: --index-pad-with=0.
--selftest
Runs internal unit tests of all functionality. Does actual renaming of
a generated set of files in the specified directory. If no directory is passed,
uses the temporary directory. Each test generates its own set of files.
You can use this to test the tool on a new machine and/or filesystem to
ensure the results are sane.
Security

The script will not let multiple files be renamed to a single name.

The script will not let existing files to be overwritten.

Both checks above are made for all matches before any renaming is performed.

The script correctly preserves extended attributes and ACLs.

Other remarks

Regular expressions supported by the script must conform to the syntax
handled by Python's re module.

Actual renaming of a single file is done by the
os.rename() function
from Python's standard library. No additional atomicity is ensured, e.g. if a
single rename fails halfway through, the filesystem is left in a state of
partially complete renaming.

Due to differences in behavior of different shells, the recommended form of
execution is to put both arguments in quotation marks.

This project might look new on Github but it's in fact a revived script
from 2011, moved over to Python 3, Mypy, Hatch, pytest, all that good
stuff. Some of the code might reflect my 2011 state of mind.
Possible future enhancements

-p option to create intermediate directories for the target. One tiny
problem is maintaining atomicity of the whole transaction.

-r option to make the source match recursive. Tricky to get right
I guess, e.g. where to rename? Existing directory structure or new one?. Let
the user decide? What's the default? Etc. etc.

Interactive mode. Things to be thought over: should the question appear
before the transaction begins, before each step, or both? Should that be one
option?

BIG FRIENDLY DISCLAIMER
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, version 3 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
DON'T PANIC. This code has been successfully used by its author and
contains tests with 100% coverage. However, be especially wary under these
conditions:

Renaming between filesystems.

Renaming under non case-preserving filesystems.

Renaming within very long paths.

Renaming volatile state (e.g. rotating logs).

And if you do lose any data, it's your fault. Have a nice day!
Authors
Script glued together by Łukasz Langa.