Mercurial > hg
annotate mercurial/diffhelper.py @ 45849:731ea8fa1f11 stable
chg: show debug message for each fd to be closed
It helps debugging. The number of file descriptors should be small in most
cases, so the console output wouldn't get bloated even with CHG_DEBUG=1.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Tue, 03 Nov 2020 11:12:25 +0900 |
parents | 10f48720ef95 |
children | d4ba4d51f85f |
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1 # diffhelper.py - helper routines for patch |
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2 # |
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3 # Copyright 2009 Matt Mackall <mpm@selenic.com> and others |
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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 __future__ import absolute_import |
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9 |
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10 from .i18n import _ |
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11 |
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12 from . import ( |
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13 error, |
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14 pycompat, |
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15 ) |
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16 |
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17 MISSING_NEWLINE_MARKER = b'\\ No newline at end of file\n' |
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18 |
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19 |
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20 def addlines(fp, hunk, lena, lenb, a, b): |
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21 """Read lines from fp into the hunk |
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22 |
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23 The hunk is parsed into two arrays, a and b. a gets the old state of |
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24 the text, b gets the new state. The control char from the hunk is saved |
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25 when inserting into a, but not b (for performance while deleting files.) |
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26 """ |
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27 while True: |
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28 todoa = lena - len(a) |
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29 todob = lenb - len(b) |
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30 num = max(todoa, todob) |
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31 if num == 0: |
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32 break |
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33 for i in pycompat.xrange(num): |
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34 s = fp.readline() |
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35 if not s: |
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36 raise error.ParseError(_(b'incomplete hunk')) |
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37 if s == MISSING_NEWLINE_MARKER: |
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38 fixnewline(hunk, a, b) |
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39 continue |
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40 if s == b'\n' or s == b'\r\n': |
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41 # Some patches may be missing the control char |
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42 # on empty lines. Supply a leading space. |
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43 s = b' ' + s |
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44 hunk.append(s) |
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45 if s.startswith(b'+'): |
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46 b.append(s[1:]) |
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47 elif s.startswith(b'-'): |
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48 a.append(s) |
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49 else: |
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50 b.append(s[1:]) |
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51 a.append(s) |
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52 |
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53 |
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54 def fixnewline(hunk, a, b): |
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55 """Fix up the last lines of a and b when the patch has no newline at EOF""" |
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56 l = hunk[-1] |
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57 # tolerate CRLF in last line |
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58 if l.endswith(b'\r\n'): |
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59 hline = l[:-2] |
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60 else: |
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61 hline = l[:-1] |
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62 |
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63 if hline.startswith((b' ', b'+')): |
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64 b[-1] = hline[1:] |
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65 if hline.startswith((b' ', b'-')): |
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66 a[-1] = hline |
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67 hunk[-1] = hline |
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68 |
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69 |
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70 def testhunk(a, b, bstart): |
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71 """Compare the lines in a with the lines in b |
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72 |
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73 a is assumed to have a control char at the start of each line, this char |
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74 is ignored in the compare. |
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75 """ |
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76 alen = len(a) |
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77 blen = len(b) |
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78 if alen > blen - bstart or bstart < 0: |
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79 return False |
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80 for i in pycompat.xrange(alen): |
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81 if a[i][1:] != b[i + bstart]: |
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82 return False |
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83 return True |