Mercurial > hg
annotate mercurial/mdiff.py @ 14605:9f1139cf5c76
hg: rearrange peer scheme lookup
There is now only peer scheme lookup. Repository lookup goes through
peer scheme lookup. When peer and repo types are finally separated,
repo lookup will use peer.local() to get a repository object.
The underbar is dropped so that extensions can patch the table.
author | Matt Mackall <mpm@selenic.com> |
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date | Mon, 13 Jun 2011 14:53:23 -0500 |
parents | 8eb758ea738c |
children | 16dc9a32ca04 |
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1 # mdiff.py - diff and patch routines for mercurial |
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2 # |
2859 | 3 # Copyright 2005, 2006 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 |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from i18n import _ |
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9 import bdiff, mpatch, util |
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10 import re, struct |
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11 |
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12 def splitnewlines(text): |
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13 '''like str.splitlines, but only split on newlines.''' |
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14 lines = [l + '\n' for l in text.split('\n')] |
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15 if lines: |
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16 if lines[-1] == '\n': |
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17 lines.pop() |
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18 else: |
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19 lines[-1] = lines[-1][:-1] |
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20 return lines |
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21 |
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22 class diffopts(object): |
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23 '''context is the number of context lines |
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24 text treats all files as text |
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25 showfunc enables diff -p output |
2907 | 26 git enables the git extended patch format |
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27 nodates removes dates from diff headers |
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28 ignorews ignores all whitespace changes in the diff |
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29 ignorewsamount ignores changes in the amount of whitespace |
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30 ignoreblanklines ignores changes whose lines are all blank |
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31 upgrade generates git diffs to avoid data loss |
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32 ''' |
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33 |
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34 defaults = { |
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35 'context': 3, |
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36 'text': False, |
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37 'showfunc': False, |
2907 | 38 'git': False, |
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39 'nodates': False, |
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40 'ignorews': False, |
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41 'ignorewsamount': False, |
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42 'ignoreblanklines': False, |
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43 'upgrade': False, |
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44 } |
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45 |
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46 __slots__ = defaults.keys() |
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47 |
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48 def __init__(self, **opts): |
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49 for k in self.__slots__: |
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50 v = opts.get(k) |
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51 if v is None: |
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52 v = self.defaults[k] |
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53 setattr(self, k, v) |
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54 |
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55 try: |
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56 self.context = int(self.context) |
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57 except ValueError: |
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58 raise util.Abort(_('diff context lines count must be ' |
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59 'an integer, not %r') % self.context) |
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60 |
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61 def copy(self, **kwargs): |
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62 opts = dict((k, getattr(self, k)) for k in self.defaults) |
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63 opts.update(kwargs) |
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64 return diffopts(**opts) |
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65 |
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66 defaultopts = diffopts() |
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67 |
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68 def wsclean(opts, text, blank=True): |
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69 if opts.ignorews: |
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70 text = re.sub('[ \t\r]+', '', text) |
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71 elif opts.ignorewsamount: |
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72 text = re.sub('[ \t\r]+', ' ', text) |
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73 text = text.replace(' \n', '\n') |
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74 if blank and opts.ignoreblanklines: |
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75 text = re.sub('\n+', '', text) |
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76 return text |
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77 |
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78 def diffline(revs, a, b, opts): |
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79 parts = ['diff'] |
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80 if opts.git: |
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81 parts.append('--git') |
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82 if revs and not opts.git: |
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83 parts.append(' '.join(["-r %s" % rev for rev in revs])) |
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84 if opts.git: |
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85 parts.append('a/%s' % a) |
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86 parts.append('b/%s' % b) |
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87 else: |
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88 parts.append(a) |
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89 return ' '.join(parts) + '\n' |
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90 |
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91 def unidiff(a, ad, b, bd, fn1, fn2, r=None, opts=defaultopts): |
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92 def datetag(date, addtab=True): |
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93 if not opts.git and not opts.nodates: |
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94 return '\t%s\n' % date |
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95 if addtab and ' ' in fn1: |
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96 return '\t\n' |
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97 return '\n' |
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98 |
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99 if not a and not b: |
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100 return "" |
1379 | 101 epoch = util.datestr((0, 0)) |
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102 |
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103 if not opts.text and (util.binary(a) or util.binary(b)): |
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104 if a and b and len(a) == len(b) and a == b: |
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105 return "" |
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106 l = ['Binary file %s has changed\n' % fn1] |
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107 elif not a: |
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108 b = splitnewlines(b) |
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109 if a is None: |
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110 l1 = '--- /dev/null%s' % datetag(epoch, False) |
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111 else: |
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112 l1 = "--- %s%s" % ("a/" + fn1, datetag(ad)) |
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113 l2 = "+++ %s%s" % ("b/" + fn2, datetag(bd)) |
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114 l3 = "@@ -0,0 +1,%d @@\n" % len(b) |
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115 l = [l1, l2, l3] + ["+" + e for e in b] |
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116 elif not b: |
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117 a = splitnewlines(a) |
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118 l1 = "--- %s%s" % ("a/" + fn1, datetag(ad)) |
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119 if b is None: |
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120 l2 = '+++ /dev/null%s' % datetag(epoch, False) |
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121 else: |
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122 l2 = "+++ %s%s" % ("b/" + fn2, datetag(bd)) |
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123 l3 = "@@ -1,%d +0,0 @@\n" % len(a) |
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124 l = [l1, l2, l3] + ["-" + e for e in a] |
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125 else: |
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126 al = splitnewlines(a) |
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127 bl = splitnewlines(b) |
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128 l = list(_unidiff(a, b, al, bl, opts=opts)) |
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129 if not l: |
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130 return "" |
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131 |
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132 l.insert(0, "--- a/%s%s" % (fn1, datetag(ad))) |
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133 l.insert(1, "+++ b/%s%s" % (fn2, datetag(bd))) |
170 | 134 |
135 for ln in xrange(len(l)): | |
136 if l[ln][-1] != '\n': | |
137 l[ln] += "\n\ No newline at end of file\n" | |
138 | |
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139 if r: |
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140 l.insert(0, diffline(r, fn1, fn2, opts)) |
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141 |
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142 return "".join(l) |
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143 |
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144 # creates a headerless unified diff |
1637 | 145 # t1 and t2 are the text to be diffed |
146 # l1 and l2 are the text broken up into lines | |
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147 def _unidiff(t1, t2, l1, l2, opts=defaultopts): |
1637 | 148 def contextend(l, len): |
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149 ret = l + opts.context |
1637 | 150 if ret > len: |
151 ret = len | |
152 return ret | |
153 | |
154 def contextstart(l): | |
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155 ret = l - opts.context |
1637 | 156 if ret < 0: |
157 return 0 | |
158 return ret | |
159 | |
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160 def yieldhunk(hunk): |
1637 | 161 (astart, a2, bstart, b2, delta) = hunk |
162 aend = contextend(a2, len(l1)) | |
163 alen = aend - astart | |
164 blen = b2 - bstart + aend - a2 | |
165 | |
166 func = "" | |
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167 if opts.showfunc: |
1637 | 168 # walk backwards from the start of the context |
169 # to find a line starting with an alphanumeric char. | |
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170 for x in xrange(astart - 1, -1, -1): |
1637 | 171 t = l1[x].rstrip() |
172 if funcre.match(t): | |
173 func = ' ' + t[:40] | |
174 break | |
175 | |
176 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen, | |
177 bstart + 1, blen, func) | |
178 for x in delta: | |
179 yield x | |
180 for x in xrange(a2, aend): | |
181 yield ' ' + l1[x] | |
182 | |
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183 if opts.showfunc: |
1637 | 184 funcre = re.compile('\w') |
185 | |
186 # bdiff.blocks gives us the matching sequences in the files. The loop | |
187 # below finds the spaces between those matching sequences and translates | |
188 # them into diff output. | |
189 # | |
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190 if opts.ignorews or opts.ignorewsamount: |
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191 t1 = wsclean(opts, t1, False) |
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192 t2 = wsclean(opts, t2, False) |
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193 |
1637 | 194 diff = bdiff.blocks(t1, t2) |
195 hunk = None | |
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196 for i, s1 in enumerate(diff): |
1637 | 197 # The first match is special. |
198 # we've either found a match starting at line 0 or a match later | |
199 # in the file. If it starts later, old and new below will both be | |
200 # empty and we'll continue to the next match. | |
201 if i > 0: | |
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202 s = diff[i - 1] |
1637 | 203 else: |
204 s = [0, 0, 0, 0] | |
205 delta = [] | |
206 a1 = s[1] | |
207 a2 = s1[0] | |
208 b1 = s[3] | |
209 b2 = s1[2] | |
210 | |
211 old = l1[a1:a2] | |
212 new = l2[b1:b2] | |
213 | |
214 # bdiff sometimes gives huge matches past eof, this check eats them, | |
215 # and deals with the special first match case described above | |
216 if not old and not new: | |
217 continue | |
218 | |
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219 if opts.ignoreblanklines: |
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220 if wsclean(opts, "".join(old)) == wsclean(opts, "".join(new)): |
1637 | 221 continue |
222 | |
223 astart = contextstart(a1) | |
224 bstart = contextstart(b1) | |
225 prev = None | |
226 if hunk: | |
227 # join with the previous hunk if it falls inside the context | |
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228 if astart < hunk[1] + opts.context + 1: |
1637 | 229 prev = hunk |
230 astart = hunk[1] | |
231 bstart = hunk[3] | |
232 else: | |
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233 for x in yieldhunk(hunk): |
1637 | 234 yield x |
235 if prev: | |
236 # we've joined the previous hunk, record the new ending points. | |
237 hunk[1] = a2 | |
238 hunk[3] = b2 | |
239 delta = hunk[4] | |
240 else: | |
241 # create a new hunk | |
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242 hunk = [astart, a2, bstart, b2, delta] |
1637 | 243 |
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244 delta[len(delta):] = [' ' + x for x in l1[astart:a1]] |
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245 delta[len(delta):] = ['-' + x for x in old] |
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246 delta[len(delta):] = ['+' + x for x in new] |
1637 | 247 |
248 if hunk: | |
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249 for x in yieldhunk(hunk): |
1637 | 250 yield x |
251 | |
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252 def patchtext(bin): |
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253 pos = 0 |
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254 t = [] |
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255 while pos < len(bin): |
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256 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12]) |
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257 pos += 12 |
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258 t.append(bin[pos:pos + l]) |
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259 pos += l |
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260 return "".join(t) |
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261 |
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262 def patch(a, bin): |
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263 if len(a) == 0: |
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264 # skip over trivial delta header |
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265 return buffer(bin, 12) |
1379 | 266 return mpatch.patches(a, [bin]) |
432 | 267 |
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268 # similar to difflib.SequenceMatcher.get_matching_blocks |
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269 def get_matching_blocks(a, b): |
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270 return [(d[0], d[2], d[1] - d[0]) for d in bdiff.blocks(a, b)] |
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271 |
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272 def trivialdiffheader(length): |
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273 return struct.pack(">lll", 0, 0, length) |
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274 |
1379 | 275 patches = mpatch.patches |
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276 patchedsize = mpatch.patchedsize |
432 | 277 textdiff = bdiff.bdiff |