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1 # ignore.py - ignored file handling for mercurial
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2 #
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3 # Copyright 2007 Matt Mackall <mpm@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2, incorporated herein by reference.
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7
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8 from i18n import _
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9 import util, match
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10 import re
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11
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12 _commentre = None
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13
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14 def _parselines(fp):
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15 for line in fp:
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16 if "#" in line:
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17 global _commentre
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18 if not _commentre:
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19 _commentre = re.compile(r'((^|[^\\])(\\\\)*)#.*')
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20 # remove comments prefixed by an even number of escapes
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21 line = _commentre.sub(r'\1', line)
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22 # fixup properly escaped comments that survived the above
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23 line = line.replace("\\#", "#")
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24 line = line.rstrip()
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25 if line:
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26 yield line
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27
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28 def ignore(root, files, warn):
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29 '''return the contents of .hgignore files as a list of patterns.
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30
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31 the files parsed for patterns include:
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32 .hgignore in the repository root
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33 any additional files specified in the [ui] section of ~/.hgrc
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34
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35 trailing white space is dropped.
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36 the escape character is backslash.
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37 comments start with #.
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38 empty lines are skipped.
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39
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40 lines can be of the following formats:
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41
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42 syntax: regexp # defaults following lines to non-rooted regexps
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43 syntax: glob # defaults following lines to non-rooted globs
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44 re:pattern # non-rooted regular expression
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45 glob:pattern # non-rooted glob
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46 pattern # pattern of the current default type'''
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47
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48 syntaxes = {'re': 'relre:', 'regexp': 'relre:', 'glob': 'relglob:'}
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49 pats = {}
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50 for f in files:
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51 try:
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52 pats[f] = []
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53 fp = open(f)
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54 syntax = 'relre:'
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55 for line in _parselines(fp):
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56 if line.startswith('syntax:'):
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57 s = line[7:].strip()
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58 try:
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59 syntax = syntaxes[s]
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60 except KeyError:
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61 warn(_("%s: ignoring invalid syntax '%s'\n") % (f, s))
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62 continue
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63 pat = syntax + line
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64 for s, rels in syntaxes.iteritems():
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65 if line.startswith(rels):
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66 pat = line
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67 break
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68 elif line.startswith(s+':'):
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69 pat = rels + line[len(s)+1:]
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70 break
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71 pats[f].append(pat)
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72 except IOError, inst:
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73 if f != files[0]:
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74 warn(_("skipping unreadable ignore file '%s': %s\n") %
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75 (f, inst.strerror))
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76
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77 allpats = []
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78 [allpats.extend(patlist) for patlist in pats.values()]
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79 if not allpats:
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80 return util.never
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81
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82 try:
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83 ignorefunc = match.match(root, '', [], allpats)
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84 except util.Abort:
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85 # Re-raise an exception where the src is the right file
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86 for f, patlist in pats.iteritems():
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87 try:
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88 match.match(root, '', [], patlist)
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89 except util.Abort, inst:
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90 raise util.Abort('%s: %s' % (f, inst[0]))
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91
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92 return ignorefunc
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