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121 lines
3.5 KiB
Python
Executable file
121 lines
3.5 KiB
Python
Executable file
#!/usr/bin/env python
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"""Quick, dirty script that will convert a csv file to yaml, spawn an editor
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for you to fiddle with it, then convert back to csv and replace the original
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file.
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Run me as: $0 some_file.csv
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The editor used is $EDITOR, of course.
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This script is not guaranteed to be even remotely reliable, so consider only
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using it on files in source control.
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"""
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import codecs
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import csv
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import os
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import subprocess
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import sys
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import tempfile
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try:
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import yaml
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except ImportError:
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sys.stderr.write("Please install PyYAML.\n")
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sys.exit(13)
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# Try to use ordered dicts, so the YAML keys are in database table order
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odict = dict # fall back to regular dict
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try:
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from collections import OrderedDict as odict
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except ImportError:
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try:
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# This is a library for 2.4-2.6
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from ordereddict import OrderedDict as odict
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except ImportError:
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pass
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# Tell PyYAML how to dump our ordered dict.
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# The items() is to avoid the sorting the library does automatically.
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# Needs to be added to SafeDumper manually, because we use safe_dump below, and
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# every Representer class has its own independent goddamn dict of these things
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from yaml.dumper import SafeDumper
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yaml.add_representer(
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odict,
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lambda dumper, data: dumper.represent_dict(data.items()),
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Dumper=SafeDumper,
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)
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### Do actual work!
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infilename, = sys.argv[1:]
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data = []
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with open(infilename) as infile:
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reader = csv.reader(infile, lineterminator='\n')
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column_names = [unicode(column) for column in next(reader)]
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# Read data...
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for row in reader:
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datum = odict()
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for col, value in zip(column_names, row):
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datum[col] = value.decode('utf-8')
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data.append(datum)
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# Monkeypatch yaml to use > syntax for multiline text; easier to edit
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from yaml.emitter import Emitter
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orig_choose_scalar_style = Emitter.choose_scalar_style
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def new_choose_scalar_style(self):
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if self.analysis is None:
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self.analysis = self.analyze_scalar(self.event.value)
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if self.analysis.multiline or len(self.analysis.scalar) > 80:
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return '>'
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return orig_choose_scalar_style(self)
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Emitter.choose_scalar_style = new_choose_scalar_style
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# Write to a tempfile
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with tempfile.NamedTemporaryFile(suffix='.yml') as tmp:
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yaml.safe_dump(data, tmp,
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default_flow_style=False,
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allow_unicode=True,
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indent=4,
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)
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del data # reclaim rams!
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error_line = '' # used on errors
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while True:
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args = [os.environ['EDITOR'], tmp.name]
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if 'vim' in os.environ['EDITOR']:
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# vim has an arg for jumping to a line:
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args.append("+{0}".format(error_line))
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# Run the user's editor and wait for it to close
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subprocess.Popen(args).wait()
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tmp.seek(0)
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try:
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new_data = yaml.safe_load(tmp)
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break
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except yaml.YAMLError as e:
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if hasattr(e, 'problem_mark'):
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error_line = e.problem_mark.line + 1
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else:
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error_line = ''
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print
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print "Oh my god what have you done:"
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print
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print str(e)
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print
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print "Press Enter to try again, or I guess ctrl-c to bail."
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raw_input()
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with open(infilename, 'wb') as outfile:
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writer = csv.writer(outfile, lineterminator='\n')
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writer.writerow([ column.encode('utf8') for column in column_names ])
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for datum in new_data:
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writer.writerow([
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datum[column].encode('utf8') for column in column_names
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])
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