Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/mdiff.py @ 2894:75bcb8210a37
merge with jeffpc
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Tue, 15 Aug 2006 11:22:29 +0200 |
parents | 8b02af865990 |
children | d838bfac668d |
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 ignorews ignores all whitespace changes in the diff |
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28 ignorewsamount ignores changes in the amount of whitespace |
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29 ignoreblanklines ignores changes whose lines are all blank''' |
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30 |
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31 defaults = { |
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32 'context': 3, |
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33 'text': False, |
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34 'showfunc': True, |
2892 | 35 'git': 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): |
35 | 53 if not a and not b: return "" |
1379 | 54 epoch = util.datestr((0, 0)) |
264
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55 |
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56 if not opts.text and (util.binary(a) or util.binary(b)): |
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57 l = ['Binary file %s has changed\n' % fn] |
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58 elif not a: |
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59 b = splitnewlines(b) |
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60 if a is None: |
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61 l1 = "--- %s\t%s\n" % ("/dev/null", epoch) |
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62 else: |
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63 l1 = "--- %s\t%s\n" % ("a/" + fn, ad) |
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64 l2 = "+++ %s\t%s\n" % ("b/" + fn, bd) |
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65 l3 = "@@ -0,0 +1,%d @@\n" % len(b) |
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66 l = [l1, l2, l3] + ["+" + e for e in b] |
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67 elif not b: |
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68 a = splitnewlines(a) |
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69 l1 = "--- %s\t%s\n" % ("a/" + fn, ad) |
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70 if b is None: |
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71 l2 = "+++ %s\t%s\n" % ("/dev/null", epoch) |
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72 else: |
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73 l2 = "+++ %s\t%s\n" % ("b/" + fn, bd) |
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74 l3 = "@@ -1,%d +0,0 @@\n" % len(a) |
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75 l = [l1, l2, l3] + ["-" + e for e in a] |
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76 else: |
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77 al = splitnewlines(a) |
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78 bl = splitnewlines(b) |
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79 l = list(bunidiff(a, b, al, bl, "a/" + fn, "b/" + fn, opts=opts)) |
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80 if not l: return "" |
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81 # difflib uses a space, rather than a tab |
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82 l[0] = "%s\t%s\n" % (l[0][:-2], ad) |
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83 l[1] = "%s\t%s\n" % (l[1][:-2], bd) |
170 | 84 |
85 for ln in xrange(len(l)): | |
86 if l[ln][-1] != '\n': | |
87 l[ln] += "\n\ No newline at end of file\n" | |
88 | |
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89 if r: |
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90 l.insert(0, "diff %s %s\n" % |
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91 (' '.join(["-r %s" % rev for rev in r]), fn)) |
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92 |
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93 return "".join(l) |
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94 |
1637 | 95 # somewhat self contained replacement for difflib.unified_diff |
96 # t1 and t2 are the text to be diffed | |
97 # l1 and l2 are the text broken up into lines | |
98 # header1 and header2 are the filenames for the diff output | |
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99 def bunidiff(t1, t2, l1, l2, header1, header2, opts=defaultopts): |
1637 | 100 def contextend(l, len): |
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101 ret = l + opts.context |
1637 | 102 if ret > len: |
103 ret = len | |
104 return ret | |
105 | |
106 def contextstart(l): | |
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107 ret = l - opts.context |
1637 | 108 if ret < 0: |
109 return 0 | |
110 return ret | |
111 | |
112 def yieldhunk(hunk, header): | |
113 if header: | |
114 for x in header: | |
115 yield x | |
116 (astart, a2, bstart, b2, delta) = hunk | |
117 aend = contextend(a2, len(l1)) | |
118 alen = aend - astart | |
119 blen = b2 - bstart + aend - a2 | |
120 | |
121 func = "" | |
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122 if opts.showfunc: |
1637 | 123 # walk backwards from the start of the context |
124 # to find a line starting with an alphanumeric char. | |
125 for x in xrange(astart, -1, -1): | |
126 t = l1[x].rstrip() | |
127 if funcre.match(t): | |
128 func = ' ' + t[:40] | |
129 break | |
130 | |
131 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen, | |
132 bstart + 1, blen, func) | |
133 for x in delta: | |
134 yield x | |
135 for x in xrange(a2, aend): | |
136 yield ' ' + l1[x] | |
137 | |
138 header = [ "--- %s\t\n" % header1, "+++ %s\t\n" % header2 ] | |
139 | |
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140 if opts.showfunc: |
1637 | 141 funcre = re.compile('\w') |
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142 if opts.ignorewsamount: |
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143 wsamountre = re.compile('[ \t]+') |
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144 wsappendedre = re.compile(' \n') |
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145 if opts.ignoreblanklines: |
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146 wsblanklinesre = re.compile('\n') |
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147 if opts.ignorews: |
1637 | 148 wsre = re.compile('[ \t]') |
149 | |
150 # bdiff.blocks gives us the matching sequences in the files. The loop | |
151 # below finds the spaces between those matching sequences and translates | |
152 # them into diff output. | |
153 # | |
154 diff = bdiff.blocks(t1, t2) | |
155 hunk = None | |
156 for i in xrange(len(diff)): | |
157 # The first match is special. | |
158 # we've either found a match starting at line 0 or a match later | |
159 # in the file. If it starts later, old and new below will both be | |
160 # empty and we'll continue to the next match. | |
161 if i > 0: | |
162 s = diff[i-1] | |
163 else: | |
164 s = [0, 0, 0, 0] | |
165 delta = [] | |
166 s1 = diff[i] | |
167 a1 = s[1] | |
168 a2 = s1[0] | |
169 b1 = s[3] | |
170 b2 = s1[2] | |
171 | |
172 old = l1[a1:a2] | |
173 new = l2[b1:b2] | |
174 | |
175 # bdiff sometimes gives huge matches past eof, this check eats them, | |
176 # and deals with the special first match case described above | |
177 if not old and not new: | |
178 continue | |
179 | |
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180 if opts.ignoreblanklines: |
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181 wsold = wsblanklinesre.sub('', "".join(old)) |
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182 wsnew = wsblanklinesre.sub('', "".join(new)) |
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183 if wsold == wsnew: |
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184 continue |
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185 |
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186 if opts.ignorewsamount: |
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187 wsold = wsamountre.sub(' ', "".join(old)) |
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188 wsold = wsappendedre.sub('\n', wsold) |
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189 wsnew = wsamountre.sub(' ', "".join(new)) |
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190 wsnew = wsappendedre.sub('\n', wsnew) |
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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.ignorews: |
1637 | 195 wsold = wsre.sub('', "".join(old)) |
196 wsnew = wsre.sub('', "".join(new)) | |
197 if wsold == wsnew: | |
198 continue | |
199 | |
200 astart = contextstart(a1) | |
201 bstart = contextstart(b1) | |
202 prev = None | |
203 if hunk: | |
204 # join with the previous hunk if it falls inside the context | |
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205 if astart < hunk[1] + opts.context + 1: |
1637 | 206 prev = hunk |
207 astart = hunk[1] | |
208 bstart = hunk[3] | |
209 else: | |
210 for x in yieldhunk(hunk, header): | |
211 yield x | |
212 # we only want to yield the header if the files differ, and | |
213 # we only want to yield it once. | |
214 header = None | |
215 if prev: | |
216 # we've joined the previous hunk, record the new ending points. | |
217 hunk[1] = a2 | |
218 hunk[3] = b2 | |
219 delta = hunk[4] | |
220 else: | |
221 # create a new hunk | |
222 hunk = [ astart, a2, bstart, b2, delta ] | |
223 | |
224 delta[len(delta):] = [ ' ' + x for x in l1[astart:a1] ] | |
225 delta[len(delta):] = [ '-' + x for x in old ] | |
226 delta[len(delta):] = [ '+' + x for x in new ] | |
227 | |
228 if hunk: | |
229 for x in yieldhunk(hunk, header): | |
230 yield x | |
231 | |
120
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232 def patchtext(bin): |
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233 pos = 0 |
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234 t = [] |
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235 while pos < len(bin): |
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236 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12]) |
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237 pos += 12 |
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238 t.append(bin[pos:pos + l]) |
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239 pos += l |
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240 return "".join(t) |
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241 |
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242 def patch(a, bin): |
1379 | 243 return mpatch.patches(a, [bin]) |
432 | 244 |
1379 | 245 patches = mpatch.patches |
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246 patchedsize = mpatch.patchedsize |
432 | 247 textdiff = bdiff.bdiff |