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#!/usr/bin/env python
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# Combines two map spreadsheets A0->B and A1->C to A->B, with B overwriting C
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import csv
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import os.path
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import sys
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sys.path.append(os.path.dirname(__file__)+"/../lib")
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import maps
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import opts
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def main():
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ignore = opts.env_flag('ignore')
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header_num = int(opts.get_env_var('header_num', 0))
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# selects which map's header to use as the output header
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try: _prog_name, map_1_path = sys.argv
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except ValueError:
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raise SystemExit('Usage: env [ignore=1] [header_num={0|1}] '+sys.argv[0]
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+' <map_0 map_1 [| '+sys.argv[0]+' map_2]... >union_map')
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headers = [None]*2
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# Open map 0
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map_0_reader = csv.reader(sys.stdin)
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headers[0] = map_0_reader.next()
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# Open map 1
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stream = open(map_1_path, 'rb')
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map_1_reader = csv.reader(stream)
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headers[1] = map_1_reader.next()
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# Check col labels
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if not maps.combinable(*headers) and not ignore:
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raise SystemExit('Map error: '
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'Map 0 column 0 label doesn\'t contain map 1 column 0 label')
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# Pass through map 0, storing which inputs it defines
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writer = csv.writer(sys.stdout)
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writer.writerow(headers[header_num])
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inputs = set()
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for row in map_0_reader:
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if row[0] != '': inputs.add(row[0])
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writer.writerow(row)
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if combinable:
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# Add entries in map 1 that weren't already defined
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for row in map_1_reader:
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if row[0] != '' and row[0] not in inputs: writer.writerow(row)
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stream.close()
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main()
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