Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/mdiff.py @ 3470:2ed139c3b328
hgweb: add revision numbers to changeset parent/child links
author | Brendan Cully <brendan@kublai.com> |
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date | Thu, 19 Oct 2006 15:58:43 -0700 |
parents | 096f1c73cdc3 |
children | abaee83ce0a6 544838cc1158 |
rev | line source |
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1 # mdiff.py - diff and patch routines for mercurial |
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2 # |
2858 | 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 |
1637 | 8 from demandload import demandload |
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9 import bdiff, mpatch |
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10 demandload(globals(), "re struct util") |
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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 |
2892 | 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 |
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32 defaults = { |
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33 'context': 3, |
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34 'text': False, |
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35 'showfunc': True, |
2892 | 36 'git': False, |
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37 'nodates': False, |
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38 'ignorews': False, |
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39 'ignorewsamount': False, |
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40 'ignoreblanklines': False, |
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41 } |
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42 |
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43 __slots__ = defaults.keys() |
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44 |
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45 def __init__(self, **opts): |
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46 for k in self.__slots__: |
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47 v = opts.get(k) |
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48 if v is None: |
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49 v = self.defaults[k] |
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50 setattr(self, k, v) |
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51 |
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52 defaultopts = diffopts() |
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53 |
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54 def unidiff(a, ad, b, bd, fn, r=None, opts=defaultopts): |
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55 def datetag(date): |
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56 return (opts.git or opts.nodates) and '\n' or '\t%s\n' % date |
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57 |
35 | 58 if not a and not b: return "" |
1379 | 59 epoch = util.datestr((0, 0)) |
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60 |
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61 if not opts.text and (util.binary(a) or util.binary(b)): |
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62 l = ['Binary file %s has changed\n' % fn] |
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63 elif not a: |
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64 b = splitnewlines(b) |
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65 if a is None: |
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66 l1 = '--- /dev/null%s' % datetag(epoch) |
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67 else: |
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68 l1 = "--- %s%s" % ("a/" + fn, datetag(ad)) |
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69 l2 = "+++ %s%s" % ("b/" + fn, datetag(bd)) |
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70 l3 = "@@ -0,0 +1,%d @@\n" % len(b) |
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71 l = [l1, l2, l3] + ["+" + e for e in b] |
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72 elif not b: |
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73 a = splitnewlines(a) |
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74 l1 = "--- %s%s" % ("a/" + fn, datetag(ad)) |
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75 if b is None: |
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76 l2 = '+++ /dev/null%s' % datetag(epoch) |
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77 else: |
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78 l2 = "+++ %s%s" % ("b/" + fn, datetag(bd)) |
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79 l3 = "@@ -1,%d +0,0 @@\n" % len(a) |
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80 l = [l1, l2, l3] + ["-" + e for e in a] |
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81 else: |
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82 al = splitnewlines(a) |
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83 bl = splitnewlines(b) |
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84 l = list(bunidiff(a, b, al, bl, "a/" + fn, "b/" + fn, opts=opts)) |
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85 if not l: return "" |
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86 # difflib uses a space, rather than a tab |
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87 l[0] = "%s%s" % (l[0][:-2], datetag(ad)) |
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88 l[1] = "%s%s" % (l[1][:-2], datetag(bd)) |
170 | 89 |
90 for ln in xrange(len(l)): | |
91 if l[ln][-1] != '\n': | |
92 l[ln] += "\n\ No newline at end of file\n" | |
93 | |
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94 if r: |
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95 l.insert(0, "diff %s %s\n" % |
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96 (' '.join(["-r %s" % rev for rev in r]), fn)) |
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97 |
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98 return "".join(l) |
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99 |
1637 | 100 # somewhat self contained replacement for difflib.unified_diff |
101 # t1 and t2 are the text to be diffed | |
102 # l1 and l2 are the text broken up into lines | |
103 # header1 and header2 are the filenames for the diff output | |
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104 def bunidiff(t1, t2, l1, l2, header1, header2, opts=defaultopts): |
1637 | 105 def contextend(l, len): |
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106 ret = l + opts.context |
1637 | 107 if ret > len: |
108 ret = len | |
109 return ret | |
110 | |
111 def contextstart(l): | |
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112 ret = l - opts.context |
1637 | 113 if ret < 0: |
114 return 0 | |
115 return ret | |
116 | |
117 def yieldhunk(hunk, header): | |
118 if header: | |
119 for x in header: | |
120 yield x | |
121 (astart, a2, bstart, b2, delta) = hunk | |
122 aend = contextend(a2, len(l1)) | |
123 alen = aend - astart | |
124 blen = b2 - bstart + aend - a2 | |
125 | |
126 func = "" | |
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127 if opts.showfunc: |
1637 | 128 # walk backwards from the start of the context |
129 # to find a line starting with an alphanumeric char. | |
130 for x in xrange(astart, -1, -1): | |
131 t = l1[x].rstrip() | |
132 if funcre.match(t): | |
133 func = ' ' + t[:40] | |
134 break | |
135 | |
136 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen, | |
137 bstart + 1, blen, func) | |
138 for x in delta: | |
139 yield x | |
140 for x in xrange(a2, aend): | |
141 yield ' ' + l1[x] | |
142 | |
143 header = [ "--- %s\t\n" % header1, "+++ %s\t\n" % header2 ] | |
144 | |
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145 if opts.showfunc: |
1637 | 146 funcre = re.compile('\w') |
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147 if opts.ignorewsamount: |
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148 wsamountre = re.compile('[ \t]+') |
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149 wsappendedre = re.compile(' \n') |
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150 if opts.ignoreblanklines: |
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151 wsblanklinesre = re.compile('\n') |
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152 if opts.ignorews: |
1637 | 153 wsre = re.compile('[ \t]') |
154 | |
155 # bdiff.blocks gives us the matching sequences in the files. The loop | |
156 # below finds the spaces between those matching sequences and translates | |
157 # them into diff output. | |
158 # | |
159 diff = bdiff.blocks(t1, t2) | |
160 hunk = None | |
161 for i in xrange(len(diff)): | |
162 # The first match is special. | |
163 # we've either found a match starting at line 0 or a match later | |
164 # in the file. If it starts later, old and new below will both be | |
165 # empty and we'll continue to the next match. | |
166 if i > 0: | |
167 s = diff[i-1] | |
168 else: | |
169 s = [0, 0, 0, 0] | |
170 delta = [] | |
171 s1 = diff[i] | |
172 a1 = s[1] | |
173 a2 = s1[0] | |
174 b1 = s[3] | |
175 b2 = s1[2] | |
176 | |
177 old = l1[a1:a2] | |
178 new = l2[b1:b2] | |
179 | |
180 # bdiff sometimes gives huge matches past eof, this check eats them, | |
181 # and deals with the special first match case described above | |
182 if not old and not new: | |
183 continue | |
184 | |
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185 if opts.ignoreblanklines: |
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186 wsold = wsblanklinesre.sub('', "".join(old)) |
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187 wsnew = wsblanklinesre.sub('', "".join(new)) |
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188 if wsold == wsnew: |
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189 continue |
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190 |
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191 if opts.ignorewsamount: |
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192 wsold = wsamountre.sub(' ', "".join(old)) |
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193 wsold = wsappendedre.sub('\n', wsold) |
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194 wsnew = wsamountre.sub(' ', "".join(new)) |
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195 wsnew = wsappendedre.sub('\n', wsnew) |
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196 if wsold == wsnew: |
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197 continue |
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198 |
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199 if opts.ignorews: |
1637 | 200 wsold = wsre.sub('', "".join(old)) |
201 wsnew = wsre.sub('', "".join(new)) | |
202 if wsold == wsnew: | |
203 continue | |
204 | |
205 astart = contextstart(a1) | |
206 bstart = contextstart(b1) | |
207 prev = None | |
208 if hunk: | |
209 # join with the previous hunk if it falls inside the context | |
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210 if astart < hunk[1] + opts.context + 1: |
1637 | 211 prev = hunk |
212 astart = hunk[1] | |
213 bstart = hunk[3] | |
214 else: | |
215 for x in yieldhunk(hunk, header): | |
216 yield x | |
217 # we only want to yield the header if the files differ, and | |
218 # we only want to yield it once. | |
219 header = None | |
220 if prev: | |
221 # we've joined the previous hunk, record the new ending points. | |
222 hunk[1] = a2 | |
223 hunk[3] = b2 | |
224 delta = hunk[4] | |
225 else: | |
226 # create a new hunk | |
227 hunk = [ astart, a2, bstart, b2, delta ] | |
228 | |
229 delta[len(delta):] = [ ' ' + x for x in l1[astart:a1] ] | |
230 delta[len(delta):] = [ '-' + x for x in old ] | |
231 delta[len(delta):] = [ '+' + x for x in new ] | |
232 | |
233 if hunk: | |
234 for x in yieldhunk(hunk, header): | |
235 yield x | |
236 | |
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237 def patchtext(bin): |
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238 pos = 0 |
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239 t = [] |
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240 while pos < len(bin): |
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241 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12]) |
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242 pos += 12 |
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243 t.append(bin[pos:pos + l]) |
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244 pos += l |
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245 return "".join(t) |
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246 |
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247 def patch(a, bin): |
1379 | 248 return mpatch.patches(a, [bin]) |
432 | 249 |
1379 | 250 patches = mpatch.patches |
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251 patchedsize = mpatch.patchedsize |
432 | 252 textdiff = bdiff.bdiff |