Mercurial > hg
annotate mercurial/diffhelpers.c @ 13324:e5617047c926
subrepo: make update -C clean the working directory for git subrepos
This makes 'hg update --clean' behave the same way for all three kinds
of subrepositories [hg, svn, git]. Before git subrepos did not take
the clean parameter into account, but just updated to the given
revision and merged uncommitted changes into that.
author | Erik Zielke <ez@aragost.com> |
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date | Mon, 31 Jan 2011 13:40:05 +0100 |
parents | a4e0908ce35b |
children | 9e40bc4c1bde |
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1 /* |
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2 * diffhelpers.c - helper routines for mpatch |
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3 * |
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4 * Copyright 2007 Chris Mason <chris.mason@oracle.com> |
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5 * |
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6 * This software may be used and distributed according to the terms |
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7 * of the GNU General Public License v2, incorporated herein by reference. |
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8 */ |
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9 |
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10 #include <Python.h> |
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11 #include <stdlib.h> |
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12 #include <string.h> |
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13 |
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14 #include "util.h" |
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15 |
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16 static char diffhelpers_doc[] = "Efficient diff parsing"; |
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17 static PyObject *diffhelpers_Error; |
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18 |
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19 |
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20 /* fixup the last lines of a and b when the patch has no newline at eof */ |
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21 static void _fix_newline(PyObject *hunk, PyObject *a, PyObject *b) |
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22 { |
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23 int hunksz = PyList_Size(hunk); |
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24 PyObject *s = PyList_GET_ITEM(hunk, hunksz-1); |
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25 char *l = PyBytes_AsString(s); |
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26 int alen = PyList_Size(a); |
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27 int blen = PyList_Size(b); |
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28 char c = l[0]; |
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29 PyObject *hline; |
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30 int sz = PyBytes_GET_SIZE(s); |
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31 |
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32 if (sz > 1 && l[sz-2] == '\r') |
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33 /* tolerate CRLF in last line */ |
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34 sz -= 1; |
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35 |
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36 hline = PyBytes_FromStringAndSize(l, sz-1); |
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37 |
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38 if (c == ' ' || c == '+') { |
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39 PyObject *rline = PyBytes_FromStringAndSize(l + 1, sz - 2); |
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40 PyList_SetItem(b, blen-1, rline); |
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41 } |
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42 if (c == ' ' || c == '-') { |
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43 Py_INCREF(hline); |
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44 PyList_SetItem(a, alen-1, hline); |
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45 } |
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46 PyList_SetItem(hunk, hunksz-1, hline); |
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47 } |
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48 |
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49 /* python callable form of _fix_newline */ |
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50 static PyObject * |
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51 fix_newline(PyObject *self, PyObject *args) |
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52 { |
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53 PyObject *hunk, *a, *b; |
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54 if (!PyArg_ParseTuple(args, "OOO", &hunk, &a, &b)) |
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55 return NULL; |
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56 _fix_newline(hunk, a, b); |
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57 return Py_BuildValue("l", 0); |
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58 } |
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59 |
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60 /* |
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61 * read lines from fp into the hunk. The hunk is parsed into two arrays |
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62 * a and b. a gets the old state of the text, b gets the new state |
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63 * The control char from the hunk is saved when inserting into a, but not b |
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64 * (for performance while deleting files) |
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65 */ |
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66 static PyObject * |
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67 addlines(PyObject *self, PyObject *args) |
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68 { |
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69 |
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70 PyObject *fp, *hunk, *a, *b, *x; |
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71 int i; |
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72 int lena, lenb; |
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73 int num; |
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74 int todoa, todob; |
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75 char *s, c; |
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76 PyObject *l; |
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77 if (!PyArg_ParseTuple(args, "OOiiOO", &fp, &hunk, &lena, &lenb, &a, &b)) |
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78 return NULL; |
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79 |
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80 while (1) { |
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81 todoa = lena - PyList_Size(a); |
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82 todob = lenb - PyList_Size(b); |
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83 num = todoa > todob ? todoa : todob; |
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84 if (num == 0) |
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85 break; |
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86 for (i = 0; i < num; i++) { |
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87 x = PyFile_GetLine(fp, 0); |
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88 s = PyBytes_AsString(x); |
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89 c = *s; |
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90 if (strcmp(s, "\\ No newline at end of file\n") == 0) { |
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91 _fix_newline(hunk, a, b); |
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92 continue; |
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93 } |
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94 if (c == '\n') { |
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95 /* Some patches may be missing the control char |
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96 * on empty lines. Supply a leading space. */ |
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97 Py_DECREF(x); |
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98 x = PyBytes_FromString(" \n"); |
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99 } |
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100 PyList_Append(hunk, x); |
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101 if (c == '+') { |
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102 l = PyBytes_FromString(s + 1); |
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103 PyList_Append(b, l); |
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104 Py_DECREF(l); |
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105 } else if (c == '-') { |
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106 PyList_Append(a, x); |
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107 } else { |
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108 l = PyBytes_FromString(s + 1); |
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109 PyList_Append(b, l); |
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110 Py_DECREF(l); |
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111 PyList_Append(a, x); |
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112 } |
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113 Py_DECREF(x); |
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114 } |
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115 } |
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116 return Py_BuildValue("l", 0); |
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117 } |
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118 |
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119 /* |
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120 * compare the lines in a with the lines in b. a is assumed to have |
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121 * a control char at the start of each line, this char is ignored in the |
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122 * compare |
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123 */ |
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124 static PyObject * |
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125 testhunk(PyObject *self, PyObject *args) |
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126 { |
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127 |
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128 PyObject *a, *b; |
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129 long bstart; |
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130 int alen, blen; |
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131 int i; |
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132 char *sa, *sb; |
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133 |
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134 if (!PyArg_ParseTuple(args, "OOl", &a, &b, &bstart)) |
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135 return NULL; |
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136 alen = PyList_Size(a); |
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137 blen = PyList_Size(b); |
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138 if (alen > blen - bstart) { |
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139 return Py_BuildValue("l", -1); |
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140 } |
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141 for (i = 0; i < alen; i++) { |
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142 sa = PyBytes_AsString(PyList_GET_ITEM(a, i)); |
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143 sb = PyBytes_AsString(PyList_GET_ITEM(b, i + bstart)); |
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144 if (strcmp(sa + 1, sb) != 0) |
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145 return Py_BuildValue("l", -1); |
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146 } |
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147 return Py_BuildValue("l", 0); |
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148 } |
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149 |
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150 static PyMethodDef methods[] = { |
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151 {"addlines", addlines, METH_VARARGS, "add lines to a hunk\n"}, |
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152 {"fix_newline", fix_newline, METH_VARARGS, "fixup newline counters\n"}, |
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153 {"testhunk", testhunk, METH_VARARGS, "test lines in a hunk\n"}, |
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154 {NULL, NULL} |
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155 }; |
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156 |
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157 #ifdef IS_PY3K |
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158 static struct PyModuleDef diffhelpers_module = { |
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159 PyModuleDef_HEAD_INIT, |
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160 "diffhelpers", |
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161 diffhelpers_doc, |
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162 -1, |
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163 methods |
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164 }; |
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165 |
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166 PyMODINIT_FUNC PyInit_diffhelpers(void) |
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167 { |
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168 PyObject *m; |
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169 |
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170 m = PyModule_Create(&diffhelpers_module); |
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171 if (m == NULL) |
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172 return NULL; |
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173 |
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174 diffhelpers_Error = PyErr_NewException("diffhelpers.diffhelpersError", |
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175 NULL, NULL); |
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176 Py_INCREF(diffhelpers_Error); |
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177 PyModule_AddObject(m, "diffhelpersError", diffhelpers_Error); |
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178 |
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179 return m; |
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180 } |
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181 #else |
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182 PyMODINIT_FUNC |
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183 initdiffhelpers(void) |
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184 { |
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185 Py_InitModule3("diffhelpers", methods, diffhelpers_doc); |
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186 diffhelpers_Error = PyErr_NewException("diffhelpers.diffhelpersError", |
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187 NULL, NULL); |
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188 } |
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189 #endif |
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190 |