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Fix for '? lines'. When setting the peek, if the number of lines is not known, an estimate is made based on a small read.

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This commit is contained in:
Dannon Baker
2011-01-11 09:22:51 -05:00
parent cdcf3a5f53
commit e12f40e9f6
1 changed files with 9 additions and 1 deletions
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lib/galaxy/datatypes/data.py
+9 -1
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@@ -407,7 +407,15 @@ class Text( Data ):
else:
# Number of lines is not known ( this should not happen ), and auto-detect is
# needed to set metadata
dataset.blurb = "? lines"
# This can happen when the file is larger than max_optional_metadata_filesize.
# Perform a rough estimate by extrapolating number of lines from a small read.
sample_size = min(self.max_optional_metadata_filesize, 1048576)
dataset_fh = open( dataset.file_name )
dataset_read = dataset_fh.read(sample_size)
dataset_fh.close()
sample_lines = dataset_read.count('\n')
est_lines = int(sample_lines * (dataset.get_size() / float(sample_size)))
dataset.blurb = "~%s lines" % util.commaify(str(est_lines))
else:
dataset.blurb = "%s lines" % util.commaify( str( line_count ) )
else: