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"""Various display related classes.
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Authors : MinRK, gregcaporaso, dannystaple
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"""
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from os.path import exists, isfile, splitext, abspath, join, isdir
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from os import walk, sep
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class YouTubeVideo(object):
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"""Class for embedding a YouTube Video in an IPython session, based on its video id.
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e.g. to embed the video on this page:
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http://www.youtube.com/watch?v=foo
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you would do:
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vid = YouTubeVideo("foo")
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display(vid)
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To start from 30 seconds:
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vid = YouTubeVideo("abc", start=30)
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display(vid)
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To calculate seconds from time as hours, minutes, seconds use:
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start=int(timedelta(hours=1, minutes=46, seconds=40).total_seconds())
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Other parameters can be provided as documented at
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https://developers.google.com/youtube/player_parameters#parameter-subheader
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"""
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def __init__(self, id, width=400, height=300, **kwargs):
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self.id = id
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self.width = width
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self.height = height
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self.params = kwargs
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def _repr_html_(self):
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"""return YouTube embed iframe for this video id"""
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if self.params:
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from urllib import urlencode # Deferred import
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params = "?" + urlencode(self.params)
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else:
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params = ""
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return """
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<iframe
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width="%i"
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height="%i"
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src="http://www.youtube.com/embed/%s%s"
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frameborder="0"
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allowfullscreen
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></iframe>
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""" % (self.width, self.height, self.id, params)
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class FileLink(object):
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"""Class for embedding a local file link in an IPython session, based on path
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e.g. to embed a link that was generated in the IPython notebook as my/data.txt
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you would do::
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local_file = FileLink("my/data.txt")
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display(local_file)
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or in the HTML notebook, just::
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FileLink("my/data.txt")
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"""
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html_link_str = "<a href='%s' target='_blank'>%s</a>"
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def __init__(self,
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path,
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url_prefix='files/',
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result_html_prefix='',
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result_html_suffix='<br>'):
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"""
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Parameters
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----------
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path : str
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path to the file or directory that should be formatted
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directory_prefix : str
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prefix to be prepended to all files to form a working link [default:
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'files']
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result_html_prefix : str
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text to append to beginning to link [default: none]
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result_html_suffix : str
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text to append at the end of link [default: '<br>']
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"""
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if isdir(path):
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raise ValueError,\
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("Cannot display a directory using FileLink. "
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"Use FileLinks to display '%s'." % path)
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self.path = path
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self.url_prefix = url_prefix
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self.result_html_prefix = result_html_prefix
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self.result_html_suffix = result_html_suffix
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def _format_path(self):
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fp = ''.join([self.url_prefix,self.path])
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return ''.join([self.result_html_prefix,
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self.html_link_str % (fp, self.path),
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self.result_html_suffix])
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def _repr_html_(self):
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"""return html link to file
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"""
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if not exists(self.path):
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return ("Path (<tt>%s</tt>) doesn't exist. "
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"It may still be in the process of "
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"being generated, or you may have the "
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"incorrect path." % self.path)
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return self._format_path()
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def __repr__(self):
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"""return absolute path to file
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"""
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return abspath(self.path)
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class FileLinks(FileLink):
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"""Class for embedding local file links in an IPython session, based on path
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e.g. to embed links to files that were generated in the IPython notebook under my/data
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you would do:
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local_files = FileLinks("my/data")
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display(local_files)
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or in the HTML notebook, just
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FileLinks("my/data")
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"""
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def __init__(self,
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path,
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url_prefix='files/',
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included_suffixes=None,
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result_html_prefix='',
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result_html_suffix='<br>',
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notebook_display_formatter=None,
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terminal_display_formatter=None):
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"""
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included_suffixes : list of filename suffixes to include when
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formatting output [default: include all files]
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See the FileLink (baseclass of LocalDirectory) docstring for
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information on additional parameters.
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notebook_display_formatter : func used to format links for display
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in the notebook. See discussion of formatter function below.
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terminal_display_formatter : func used to format links for display
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in the terminal. See discussion of formatter function below.
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Passing custom formatter functions
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----------------------------------
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Formatter functions must be of the form:
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f(dirname, fnames, included_suffixes)
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dirname : the name of a directory (a string),
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fnames : a list of the files in that directory
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included_suffixes : a list of the file suffixes that should be
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included in the output (passing None means
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to include all suffixes in the output in
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the built-in formatters)
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returns a list of lines that should will be print in the
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notebook (if passing notebook_display_formatter) or the terminal
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(if passing terminal_display_formatter). This function is iterated
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over for each directory in self.path. Default formatters are in
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place, can be passed here to support alternative formatting.
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"""
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if isfile(path):
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raise ValueError,\
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("Cannot display a file using FileLinks. "
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"Use FileLink to display '%s'." % path)
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self.included_suffixes = included_suffixes
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# remove trailing slashs for more consistent output formatting
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path = path.rstrip('/')
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self.path = path
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self.url_prefix = url_prefix
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self.result_html_prefix = result_html_prefix
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self.result_html_suffix = result_html_suffix
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self.notebook_display_formatter = \
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notebook_display_formatter or self._get_notebook_display_formatter()
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self.terminal_display_formatter = \
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terminal_display_formatter or self._get_terminal_display_formatter()
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def _get_display_formatter(self,
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dirname_output_format,
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fname_output_format,
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fp_format,
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fp_cleaner=None):
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""" generate built-in formatter function
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this is used to define both the notebook and terminal built-in
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formatters as they only differ by some wrapper text for each entry
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dirname_output_format: string to use for formatting directory
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names, dirname will be substituted for a single "%s" which
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must appear in this string
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fname_output_format: string to use for formatting file names,
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if a single "%s" appears in the string, fname will be substituted
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if two "%s" appear in the string, the path to fname will be
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substituted for the first and fname will be substituted for the
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second
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fp_format: string to use for formatting filepaths, must contain
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exactly two "%s" and the dirname will be subsituted for the first
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and fname will be substituted for the second
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"""
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def f(dirname, fnames, included_suffixes=None):
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result = []
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# begin by figuring out which filenames, if any,
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# are going to be displayed
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display_fnames = []
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for fname in fnames:
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if (isfile(join(dirname,fname)) and
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(included_suffixes == None or
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splitext(fname)[1] in included_suffixes)):
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display_fnames.append(fname)
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if len(display_fnames) == 0:
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# if there are no filenames to display, don't print anything
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# (not even the directory name)
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pass
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else:
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# otherwise print the formatted directory name followed by
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# the formatted filenames
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dirname_output_line = dirname_output_format % dirname
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result.append(dirname_output_line)
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for fname in display_fnames:
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fp = fp_format % (dirname,fname)
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if fp_cleaner is not None:
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fp = fp_cleaner(fp)
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try:
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# output can include both a filepath and a filename...
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fname_output_line = fname_output_format % (fp, fname)
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except TypeError:
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# ... or just a single filepath
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fname_output_line = fname_output_format % fname
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result.append(fname_output_line)
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return result
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return f
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def _get_notebook_display_formatter(self,
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spacer=" "):
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""" generate function to use for notebook formatting
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"""
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dirname_output_format = \
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self.result_html_prefix + "%s/" + self.result_html_suffix
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fname_output_format = \
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self.result_html_prefix + spacer + self.html_link_str + self.result_html_suffix
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fp_format = self.url_prefix + '%s/%s'
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if sep == "\\":
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# Working on a platform where the path separator is "\", so
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# must convert these to "/" for generating a URI
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def fp_cleaner(fp):
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# Replace all occurences of backslash ("\") with a forward
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# slash ("/") - this is necessary on windows when a path is
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# provided as input, but we must link to a URI
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return fp.replace('\\','/')
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else:
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fp_cleaner = None
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return self._get_display_formatter(dirname_output_format,
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fname_output_format,
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fp_format,
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fp_cleaner)
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def _get_terminal_display_formatter(self,
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spacer=" "):
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""" generate function to use for terminal formatting
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"""
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dirname_output_format = "%s/"
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fname_output_format = spacer + "%s"
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fp_format = '%s/%s'
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return self._get_display_formatter(dirname_output_format,
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fname_output_format,
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fp_format)
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def _format_path(self):
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result_lines = []
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walked_dir = list(walk(self.path))
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walked_dir.sort()
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for dirname, subdirs, fnames in walked_dir:
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result_lines += self.notebook_display_formatter(dirname, fnames, self.included_suffixes)
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return '\n'.join(result_lines)
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def __repr__(self):
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"""return newline-separated absolute paths
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"""
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result_lines = []
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walked_dir = list(walk(self.path))
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walked_dir.sort()
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for dirname, subdirs, fnames in walked_dir:
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result_lines += self.terminal_display_formatter(dirname, fnames, self.included_suffixes)
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return '\n'.join(result_lines)
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