Mercurial > hg
annotate mercurial/mdiff.py @ 4384:caaba589d9c7
Use patch.patch() when checking for patch availability.
The test is closer to what we want to know. It also makes sense when you deal with patched versions of patch() as most people do under win32.
author | Patrick Mezard <pmezard@gmail.com> |
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date | Sat, 28 Apr 2007 11:53:36 +0200 |
parents | 99c853a1408c |
children | 826659bd8053 |
rev | line source |
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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 |
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6 # of the GNU General Public License, incorporated herein by reference. |
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7 |
4108 | 8 import bdiff, mpatch, re, struct, util, md5 |
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9 |
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10 def splitnewlines(text): |
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11 '''like str.splitlines, but only split on newlines.''' |
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12 lines = [l + '\n' for l in text.split('\n')] |
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13 if lines: |
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14 if lines[-1] == '\n': |
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15 lines.pop() |
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16 else: |
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17 lines[-1] = lines[-1][:-1] |
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18 return lines |
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19 |
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20 class diffopts(object): |
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21 '''context is the number of context lines |
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22 text treats all files as text |
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23 showfunc enables diff -p output |
2907 | 24 git enables the git extended patch format |
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25 nodates removes dates from diff headers |
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26 ignorews ignores all whitespace changes in the diff |
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27 ignorewsamount ignores changes in the amount of whitespace |
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28 ignoreblanklines ignores changes whose lines are all blank''' |
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29 |
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30 defaults = { |
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31 'context': 3, |
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32 'text': False, |
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33 'showfunc': True, |
2907 | 34 'git': False, |
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35 'nodates': False, |
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36 'ignorews': False, |
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37 'ignorewsamount': False, |
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38 'ignoreblanklines': False, |
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39 } |
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40 |
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41 __slots__ = defaults.keys() |
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42 |
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43 def __init__(self, **opts): |
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44 for k in self.__slots__: |
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45 v = opts.get(k) |
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46 if v is None: |
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47 v = self.defaults[k] |
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48 setattr(self, k, v) |
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49 |
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50 defaultopts = diffopts() |
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51 |
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52 def unidiff(a, ad, b, bd, fn, r=None, opts=defaultopts): |
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53 def datetag(date): |
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54 return (opts.git or opts.nodates) and '\n' or '\t%s\n' % date |
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55 |
35 | 56 if not a and not b: return "" |
1379 | 57 epoch = util.datestr((0, 0)) |
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58 |
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59 if not opts.text and (util.binary(a) or util.binary(b)): |
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60 def h(v): |
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61 # md5 is used instead of sha1 because md5 is supposedly faster |
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62 return md5.new(v).digest() |
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63 if a and b and len(a) == len(b) and h(a) == h(b): |
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64 return "" |
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65 l = ['Binary file %s has changed\n' % fn] |
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66 elif not a: |
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67 b = splitnewlines(b) |
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68 if a is None: |
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69 l1 = '--- /dev/null%s' % datetag(epoch) |
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70 else: |
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71 l1 = "--- %s%s" % ("a/" + fn, datetag(ad)) |
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72 l2 = "+++ %s%s" % ("b/" + fn, datetag(bd)) |
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73 l3 = "@@ -0,0 +1,%d @@\n" % len(b) |
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74 l = [l1, l2, l3] + ["+" + e for e in b] |
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75 elif not b: |
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76 a = splitnewlines(a) |
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77 l1 = "--- %s%s" % ("a/" + fn, datetag(ad)) |
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78 if b is None: |
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79 l2 = '+++ /dev/null%s' % datetag(epoch) |
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80 else: |
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81 l2 = "+++ %s%s" % ("b/" + fn, datetag(bd)) |
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82 l3 = "@@ -1,%d +0,0 @@\n" % len(a) |
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83 l = [l1, l2, l3] + ["-" + e for e in a] |
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84 else: |
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85 al = splitnewlines(a) |
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86 bl = splitnewlines(b) |
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87 l = list(bunidiff(a, b, al, bl, "a/" + fn, "b/" + fn, opts=opts)) |
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88 if not l: return "" |
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89 # difflib uses a space, rather than a tab |
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90 l[0] = "%s%s" % (l[0][:-2], datetag(ad)) |
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91 l[1] = "%s%s" % (l[1][:-2], datetag(bd)) |
170 | 92 |
93 for ln in xrange(len(l)): | |
94 if l[ln][-1] != '\n': | |
95 l[ln] += "\n\ No newline at end of file\n" | |
96 | |
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97 if r: |
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98 l.insert(0, "diff %s %s\n" % |
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99 (' '.join(["-r %s" % rev for rev in r]), fn)) |
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100 |
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101 return "".join(l) |
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102 |
1637 | 103 # somewhat self contained replacement for difflib.unified_diff |
104 # t1 and t2 are the text to be diffed | |
105 # l1 and l2 are the text broken up into lines | |
106 # header1 and header2 are the filenames for the diff output | |
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107 def bunidiff(t1, t2, l1, l2, header1, header2, opts=defaultopts): |
1637 | 108 def contextend(l, len): |
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109 ret = l + opts.context |
1637 | 110 if ret > len: |
111 ret = len | |
112 return ret | |
113 | |
114 def contextstart(l): | |
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115 ret = l - opts.context |
1637 | 116 if ret < 0: |
117 return 0 | |
118 return ret | |
119 | |
120 def yieldhunk(hunk, header): | |
121 if header: | |
122 for x in header: | |
123 yield x | |
124 (astart, a2, bstart, b2, delta) = hunk | |
125 aend = contextend(a2, len(l1)) | |
126 alen = aend - astart | |
127 blen = b2 - bstart + aend - a2 | |
128 | |
129 func = "" | |
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130 if opts.showfunc: |
1637 | 131 # walk backwards from the start of the context |
132 # to find a line starting with an alphanumeric char. | |
133 for x in xrange(astart, -1, -1): | |
134 t = l1[x].rstrip() | |
135 if funcre.match(t): | |
136 func = ' ' + t[:40] | |
137 break | |
138 | |
139 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen, | |
140 bstart + 1, blen, func) | |
141 for x in delta: | |
142 yield x | |
143 for x in xrange(a2, aend): | |
144 yield ' ' + l1[x] | |
145 | |
146 header = [ "--- %s\t\n" % header1, "+++ %s\t\n" % header2 ] | |
147 | |
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148 if opts.showfunc: |
1637 | 149 funcre = re.compile('\w') |
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150 if opts.ignorewsamount: |
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151 wsamountre = re.compile('[ \t]+') |
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152 wsappendedre = re.compile(' \n') |
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153 if opts.ignoreblanklines: |
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154 wsblanklinesre = re.compile('\n') |
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155 if opts.ignorews: |
1637 | 156 wsre = re.compile('[ \t]') |
157 | |
158 # bdiff.blocks gives us the matching sequences in the files. The loop | |
159 # below finds the spaces between those matching sequences and translates | |
160 # them into diff output. | |
161 # | |
162 diff = bdiff.blocks(t1, t2) | |
163 hunk = None | |
164 for i in xrange(len(diff)): | |
165 # The first match is special. | |
166 # we've either found a match starting at line 0 or a match later | |
167 # in the file. If it starts later, old and new below will both be | |
168 # empty and we'll continue to the next match. | |
169 if i > 0: | |
170 s = diff[i-1] | |
171 else: | |
172 s = [0, 0, 0, 0] | |
173 delta = [] | |
174 s1 = diff[i] | |
175 a1 = s[1] | |
176 a2 = s1[0] | |
177 b1 = s[3] | |
178 b2 = s1[2] | |
179 | |
180 old = l1[a1:a2] | |
181 new = l2[b1:b2] | |
182 | |
183 # bdiff sometimes gives huge matches past eof, this check eats them, | |
184 # and deals with the special first match case described above | |
185 if not old and not new: | |
186 continue | |
187 | |
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188 if opts.ignoreblanklines: |
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189 wsold = wsblanklinesre.sub('', "".join(old)) |
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190 wsnew = wsblanklinesre.sub('', "".join(new)) |
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191 if wsold == wsnew: |
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192 continue |
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193 |
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194 if opts.ignorewsamount: |
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195 wsold = wsamountre.sub(' ', "".join(old)) |
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196 wsold = wsappendedre.sub('\n', wsold) |
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197 wsnew = wsamountre.sub(' ', "".join(new)) |
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198 wsnew = wsappendedre.sub('\n', wsnew) |
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199 if wsold == wsnew: |
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200 continue |
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201 |
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202 if opts.ignorews: |
1637 | 203 wsold = wsre.sub('', "".join(old)) |
204 wsnew = wsre.sub('', "".join(new)) | |
205 if wsold == wsnew: | |
206 continue | |
207 | |
208 astart = contextstart(a1) | |
209 bstart = contextstart(b1) | |
210 prev = None | |
211 if hunk: | |
212 # join with the previous hunk if it falls inside the context | |
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213 if astart < hunk[1] + opts.context + 1: |
1637 | 214 prev = hunk |
215 astart = hunk[1] | |
216 bstart = hunk[3] | |
217 else: | |
218 for x in yieldhunk(hunk, header): | |
219 yield x | |
220 # we only want to yield the header if the files differ, and | |
221 # we only want to yield it once. | |
222 header = None | |
223 if prev: | |
224 # we've joined the previous hunk, record the new ending points. | |
225 hunk[1] = a2 | |
226 hunk[3] = b2 | |
227 delta = hunk[4] | |
228 else: | |
229 # create a new hunk | |
230 hunk = [ astart, a2, bstart, b2, delta ] | |
231 | |
232 delta[len(delta):] = [ ' ' + x for x in l1[astart:a1] ] | |
233 delta[len(delta):] = [ '-' + x for x in old ] | |
234 delta[len(delta):] = [ '+' + x for x in new ] | |
235 | |
236 if hunk: | |
237 for x in yieldhunk(hunk, header): | |
238 yield x | |
239 | |
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240 def patchtext(bin): |
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241 pos = 0 |
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242 t = [] |
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243 while pos < len(bin): |
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244 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12]) |
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245 pos += 12 |
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246 t.append(bin[pos:pos + l]) |
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247 pos += l |
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248 return "".join(t) |
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249 |
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250 def patch(a, bin): |
1379 | 251 return mpatch.patches(a, [bin]) |
432 | 252 |
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253 # similar to difflib.SequenceMatcher.get_matching_blocks |
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254 def get_matching_blocks(a, b): |
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255 return [(d[0], d[2], d[1] - d[0]) for d in bdiff.blocks(a, b)] |
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256 |
1379 | 257 patches = mpatch.patches |
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258 patchedsize = mpatch.patchedsize |
432 | 259 textdiff = bdiff.bdiff |