54 lines
1.8 KiB
Python
54 lines
1.8 KiB
Python
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"""Collection of utilities for command-line interfaces and console scripts."""
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import os
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import re
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numberAddedRE = re.compile(r"#\d+$")
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def makeOutputFileName(
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input, outputDir=None, extension=None, overWrite=False, suffix=""
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):
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"""Generates a suitable file name for writing output.
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Often tools will want to take a file, do some kind of transformation to it,
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and write it out again. This function determines an appropriate name for the
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output file, through one or more of the following steps:
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- changing the output directory
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- appending suffix before file extension
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- replacing the file extension
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- suffixing the filename with a number (``#1``, ``#2``, etc.) to avoid
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overwriting an existing file.
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Args:
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input: Name of input file.
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outputDir: Optionally, a new directory to write the file into.
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suffix: Optionally, a string suffix is appended to file name before
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the extension.
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extension: Optionally, a replacement for the current file extension.
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overWrite: Overwriting an existing file is permitted if true; if false
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and the proposed filename exists, a new name will be generated by
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adding an appropriate number suffix.
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Returns:
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str: Suitable output filename
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"""
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dirName, fileName = os.path.split(input)
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fileName, ext = os.path.splitext(fileName)
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if outputDir:
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dirName = outputDir
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fileName = numberAddedRE.split(fileName)[0]
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if extension is None:
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extension = os.path.splitext(input)[1]
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output = os.path.join(dirName, fileName + suffix + extension)
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n = 1
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if not overWrite:
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while os.path.exists(output):
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output = os.path.join(
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dirName, fileName + suffix + "#" + repr(n) + extension
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)
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n += 1
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return output
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