270 lines
7 KiB
Python
270 lines
7 KiB
Python
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#!/usr/bin/env python3
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"""
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Converts the LibreOffice `download.lst` file into a Nix expression.
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Requires an environment variable named `downloadList` identifying the path
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of the input file, and writes the result to stdout.
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todo - Ideally we would move as much as possible into derivation dependencies.
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"""
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import collections, itertools, json, re, sys, os
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def main():
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print('[')
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for x in get_packages():
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print('{')
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print(' name = "{}";'.format(x['tarball']))
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print(' md5 = "{}";'.format(x['md5']))
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print(' brief = {};'.format('true' if x['brief'] else 'false'))
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if 'subdir' in x:
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print(' subDir = "{}";'.format(x['subdir']))
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print('}')
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print(']')
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def get_packages():
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"""
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All of the package data: What's parsed from download.lst,
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plus our additions.
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"""
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return apply_additions(get_packages_from_download_list(),
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get_additions())
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def get_additions():
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"""
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A mapping from package name (the all-caps identifiers used in
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`download.lst`) to a dict of additional attributes to set on the package.
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"""
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with open('./libreoffice-srcs-additions.json') as f:
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return json.load(f)
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def apply_additions(xs, additions):
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for x in xs:
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yield dict_merge([x,
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additions.get(x['name'], {})])
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def get_packages_from_download_list():
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"""
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The result of parsing `download.lst`: A list of dicts containing keys
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'name', 'tarball', 'md5', 'brief'.
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"""
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def lines():
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for x in sub_symbols(parse_lines(get_lines())):
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interpretation = interpret(x)
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if interpretation == 'unrecognized':
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print_skipped_line(x)
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else:
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yield dict_merge([x,
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interpretation])
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def cluster(xs):
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"""
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Groups lines according to their order within the file, to support
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packages that are listed in `download.lst` more than once.
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"""
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keys = ['tarball', 'md5', 'brief']
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a = {k: [x for x in xs if k in x['attrs']] for k in keys}
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return zip(*[a[k] for k in keys])
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def packages():
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for (name, group) in groupby(lines(), lambda x: x['name']):
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for xs in cluster(group):
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yield {'name': name,
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'attrs': dict_merge(x['attrs'] for x in xs),
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'index': min(x['index'] for x in xs)}
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for x in sorted(packages(), key=lambda x: x['index']):
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yield dict_merge([{'name': x['name']},
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x['attrs']])
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def dict_merge(xs):
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"""
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>>> dict_merge([{1: 2}, {3: 4}, {3: 5}])
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{1: 2, 3: 4}
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"""
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return dict(collections.ChainMap(*xs))
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def groupby(xs, f):
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"""
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>>> groupby([1, 2, 3, 4], lambda x: x % 2)
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[(0, [2, 4]), (1, [1, 3])]
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"""
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for (k, iter) in itertools.groupby(sorted(xs, key=f), f):
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group = list(iter)
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yield (f(group[0]), group)
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def get_lines():
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download_list = os.getenv('downloadList')
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with open(download_list) as f:
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return f.read().splitlines()
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def print_skipped_line(x):
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print('Skipped line {}: {}'.format(x['index'],
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x['original']),
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file=sys.stderr)
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def parse_lines(lines):
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"""
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Input: List of strings (the lines from `download.lst`
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Output: Iterator of dicts with keys 'key', 'value', and 'index'
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"""
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for (index, line) in enumerate(lines):
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x = { 'index': index, 'original': line }
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result = parse_line(line)
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if result == 'nothing':
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pass
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elif result == 'unrecognized':
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print_skipped_line(x)
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else:
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yield dict_merge([x,
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result])
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def parse_line(line):
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"""
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Input: A string
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Output: One of 1. A dict with keys 'key', 'value'
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2. 'nothing' (if the line contains no information)
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2. 'unrecognized' (if parsing failed)
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"""
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if re.match('\s*(#.*)?$', line):
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return 'nothing'
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match = re.match('\s*export\s+([^:\s]+)\s*:=\s*(.*)$', line)
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if match:
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return {
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'key': match.group(1),
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'value': match.group(2).strip()
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}
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else:
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return 'unrecognized'
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def sub_symbols(xs):
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"""
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Do substitution of variables across all lines.
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>>> sub_symbols([{'key': 'a', 'value': 'x'},
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... {'key': 'c': 'value': '$(a)yz'}])
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[{'key': 'a', 'value': 'x'}, {'key': 'c': 'value': 'xyz'}]
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"""
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xs = list(xs)
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symbols = {x['key']: x for x in xs}
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def get_value(k):
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x = symbols.get(k)
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return x['value'] if x is not None else None
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for x in xs:
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yield dict_merge([{'value': sub_str(x['value'], get_value)},
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x])
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def sub_str(string, func):
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"""
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Do substitution of variables in a single line.
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>>> sub_str("x = $(x)", lambda k: {'x': 'a'}[k])
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"x = a"
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"""
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def func2(m):
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x = m.group(1)
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result = func(x)
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return result if result is not None else x
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return re.sub(r'\$\(([^\$\(\)]+)\)', func2, string)
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def interpret(x):
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"""
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Input: Dict with keys 'key' and 'value'
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Output: One of 1. Dict with keys 'name' and 'attrs'
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2. 'unrecognized' (if interpretation failed)
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"""
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for f in [interpret_md5, interpret_tarball_with_md5, interpret_tarball]:
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result = f(x)
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if result is not None:
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return result
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return 'unrecognized'
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def interpret_md5(x):
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"""
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>>> interpret_md5("ODFGEN_MD5SUM", "32572ea48d9021bbd6fa317ddb697abc")
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{'name': 'ODFGEN', 'attrs': {'md5': '32572ea48d9021bbd6fa317ddb697abc'}}
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"""
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match = re.match('^(.*)_MD5SUM$', x['key'])
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if match:
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return {'name': match.group(1),
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'attrs': {'md5': x['value']}}
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def interpret_tarball(x):
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"""
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>>> interpret_tarball("FREEHAND_TARBALL", "libfreehand-0.1.1.tar.bz2")
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{'name': 'FREEHAND',
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'attrs': {'tarball': 'libfreehand-0.1.1.tar.bz2', 'brief': True}}
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"""
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match = re.match('^(.*)_TARBALL$', x['key'])
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if match:
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return {'name': match.group(1),
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'attrs': {'tarball': x['value'], 'brief': True}}
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def interpret_tarball_with_md5(x):
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"""
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>>> interpret_tarball_with_md5("CLUCENE_TARBALL",\
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"48d647fbd8ef8889e5a7f422c1bfda94-clucene-core-2.3.3.4.tar.gz")
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{'name': 'CLUCENE',
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'attrs': {'tarball': 'clucene-core-2.3.3.4.tar.gz',
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'md5': '48d647fbd8ef8889e5a7f422c1bfda94', 'brief': False}}
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"""
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match = {'key': re.match('^(.*)_TARBALL$', x['key']),
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'value': re.match('(?P<md5>[0-9a-fA-F]{32})-(?P<tarball>.+)$',
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x['value'])}
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if match['key'] and match['value']:
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return {'name': match['key'].group(1),
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'attrs': {'tarball': match['value'].group('tarball'),
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'md5': match['value'].group('md5'),
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'brief': False}}
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main()
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