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annotate mercurial/mdiff.py @ 170:e6c621a825f2

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hg diff: fix missing final newline bug
author mpm@selenic.com
date Thu, 26 May 2005 13:02:28 -0800
parents 44538462d3c8
children 697f05bfe976
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1 #!/usr/bin/python
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2 import difflib, struct, mmap
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3 from mercurial.mpatch import *
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5 def unidiff(a, ad, b, bd, fn):
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6 if not a and not b: return ""
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7 a = a.splitlines(1)
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8 b = b.splitlines(1)
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9 l = list(difflib.unified_diff(a, b, "a/" + fn, "b/" + fn, ad, bd))
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10
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11 for ln in xrange(len(l)):
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12 if l[ln][-1] != '\n':
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13 l[ln] += "\n\ No newline at end of file\n"
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14
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15 return "".join(l)
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16
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17 def textdiff(a, b):
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18 return diff(a.splitlines(1), b.splitlines(1))
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19
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20 def sortdiff(a, b):
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21 la = lb = 0
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22
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23 while 1:
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24 if la >= len(a) or lb >= len(b): break
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25 if b[lb] < a[la]:
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26 si = lb
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27 while lb < len(b) and b[lb] < a[la] : lb += 1
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28 yield "insert", la, la, si, lb
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29 elif a[la] < b[lb]:
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30 si = la
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31 while la < len(a) and a[la] < b[lb]: la += 1
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32 yield "delete", si, la, lb, lb
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33 else:
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34 la += 1
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35 lb += 1
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36
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37 if lb < len(b):
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38 yield "insert", la, la, lb, len(b)
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40 if la < len(a):
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41 yield "delete", la, len(a), lb, lb
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42
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43 def diff(a, b, sorted=0):
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44 bin = []
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45 p = [0]
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46 for i in a: p.append(p[-1] + len(i))
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47
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48 if sorted:
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49 d = sortdiff(a, b)
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50 else:
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51 d = difflib.SequenceMatcher(None, a, b).get_opcodes()
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52
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53 for o, m, n, s, t in d:
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54 if o == 'equal': continue
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55 s = "".join(b[s:t])
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56 bin.append(struct.pack(">lll", p[m], p[n], len(s)) + s)
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57
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58 return "".join(bin)
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60 def patchtext(bin):
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61 pos = 0
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62 t = []
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63 while pos < len(bin):
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64 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])
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65 pos += 12
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66 t.append(bin[pos:pos + l])
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67 pos += l
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68 return "".join(t)
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69
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70 def patch(a, bin):
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71 return patches(a, [bin])