Mercurial > hg > mercurial-crew-with-dirclash

annotate mercurial/util.py @ 812:b65af904d6d7

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Reduce the amount of stat traffic generated by a walk. When we switched to the new walk code for commands, we no longer passed a list of specific files to the repo or dirstate walk or changes methods. This meant that we always walked and attempted to match everything, which was not efficient. Now, if we are given any patterns to match, or nothing at all, we still walk everything. But if we are given only file names that contain no glob characters, we only walk those.
author Bryan O'Sullivan <bos@serpentine.com>
date Fri, 29 Jul 2005 12:30:12 -0800
parents cdb9e95b2fab
children 0902ffece4b4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # util.py - utility functions and platform specfic implementations
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2 #
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3 # Copyright 2005 K. Thananchayan <thananck@yahoo.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
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8 import os, errno
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9 from demandload import *
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10 demandload(globals(), "re")
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11
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12 def unique(g):
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13 seen = {}
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14 for f in g:
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15 if f not in seen:
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16 seen[f] = 1
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17 yield f
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18
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19 class CommandError(Exception): pass
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20
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21 def always(fn): return True
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22 def never(fn): return False
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23
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24 def globre(pat, head = '^', tail = '$'):
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25 "convert a glob pattern into a regexp"
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26 i, n = 0, len(pat)
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27 res = ''
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28 group = False
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29 def peek(): return i < n and pat[i]
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30 while i < n:
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31 c = pat[i]
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32 i = i+1
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33 if c == '*':
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34 if peek() == '*':
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35 i += 1
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36 res += '.*'
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37 else:
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38 res += '[^/]*'
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39 elif c == '?':
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40 res += '.'
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41 elif c == '[':
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42 j = i
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43 if j < n and pat[j] in '!]':
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44 j += 1
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45 while j < n and pat[j] != ']':
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46 j += 1
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47 if j >= n:
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48 res += '\\['
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49 else:
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50 stuff = pat[i:j].replace('\\','\\\\')
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51 i = j + 1
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52 if stuff[0] == '!':
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53 stuff = '^' + stuff[1:]
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54 elif stuff[0] == '^':
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55 stuff = '\\' + stuff
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56 res = '%s[%s]' % (res, stuff)
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57 elif c == '{':
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58 group = True
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59 res += '(?:'
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60 elif c == '}' and group:
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61 res += ')'
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62 group = False
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63 elif c == ',' and group:
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64 res += '|'
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65 else:
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66 res += re.escape(c)
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67 return head + res + tail
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68
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69 _globchars = {'[': 1, '{': 1, '*': 1, '?': 1}
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70
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71 def matcher(cwd, names, inc, exc, head = ''):
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72 def patlike(name):
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73 for prefix in 're:', 'glob:', 'path:':
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74 if name.startswith(prefix): return True
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75 for c in name:
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76 if c in _globchars: return True
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77
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78 def regex(name, tail):
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79 '''convert a pattern into a regular expression'''
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80 if name.startswith('re:'):
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81 return name[3:]
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82 elif name.startswith('path:'):
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83 return '^' + re.escape(name[5:]) + '$'
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84 elif name.startswith('glob:'):
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85 return head + globre(name[5:], '', tail)
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86 return head + globre(name, '', tail)
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87
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88 cwdsep = cwd + os.sep
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89
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90 def under(fn):
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91 """check if fn is under our cwd"""
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92 return not cwd or fn.startswith(cwdsep)
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93
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94 def matchfn(pats, tail):
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95 """build a matching function from a set of patterns"""
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96 if pats:
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97 pat = '(?:%s)' % '|'.join([regex(p, tail) for p in pats])
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98 if cwd:
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99 pat = re.escape(cwdsep) + pat
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100 return re.compile(pat).match
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101
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102 pats = filter(patlike, names)
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103 files = [n for n in names if not patlike(n)]
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104 if pats: plain = []
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105 elif cwd: plain = [cwdsep + f for f in files]
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106 else: plain = files
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107
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108 patmatch = matchfn(pats, '$')
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109 filematch = matchfn(files, '(?:/|$)')
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110 incmatch = matchfn(inc, '(?:/|$)') or under
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111 excmatch = matchfn(exc, '(?:/|$)') or (lambda fn: False)
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112
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113 return plain, lambda fn: (incmatch(fn) and not excmatch(fn) and
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114 (fn.endswith('/') or
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115 (not pats and not files) or
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116 (pats and patmatch(fn)) or
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117 (files and filematch(fn))))
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118
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119 def system(cmd, errprefix=None):
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120 """execute a shell command that must succeed"""
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121 rc = os.system(cmd)
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122 if rc:
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123 errmsg = "%s %s" % (os.path.basename(cmd.split(None, 1)[0]),
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124 explain_exit(rc)[0])
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125 if errprefix:
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126 errmsg = "%s: %s" % (errprefix, errmsg)
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127 raise CommandError(errmsg)
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128
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129 def rename(src, dst):
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130 try:
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131 os.rename(src, dst)
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132 except:
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133 os.unlink(dst)
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134 os.rename(src, dst)
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135
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136 def copytree(src, dst, copyfile):
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137 """Copy a directory tree, files are copied using 'copyfile'."""
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138 names = os.listdir(src)
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139 os.mkdir(dst)
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140
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141 for name in names:
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142 srcname = os.path.join(src, name)
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143 dstname = os.path.join(dst, name)
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144 if os.path.isdir(srcname):
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145 copytree(srcname, dstname, copyfile)
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146 elif os.path.isfile(srcname):
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147 copyfile(srcname, dstname)
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148 else:
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149 raise IOError("Not a regular file: %r" % srcname)
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150
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151 def _makelock_file(info, pathname):
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152 ld = os.open(pathname, os.O_CREAT | os.O_WRONLY | os.O_EXCL)
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153 os.write(ld, info)
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154 os.close(ld)
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155
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156 def _readlock_file(pathname):
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157 return file(pathname).read()
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158
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159 # Platfor specific varients
419
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160 if os.name == 'nt':
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161 nulldev = 'NUL:'
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162
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163 def is_exec(f, last):
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164 return last
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165
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166 def set_exec(f, mode):
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167 pass
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168
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169 def pconvert(path):
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170 return path.replace("\\", "/")
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171
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172 makelock = _makelock_file
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173 readlock = _readlock_file
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174
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175 def explain_exit(code):
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176 return "exited with status %d" % code, code
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177
419
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178 else:
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179 nulldev = '/dev/null'
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180
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181 def is_exec(f, last):
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182 return (os.stat(f).st_mode & 0100 != 0)
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183
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184 def set_exec(f, mode):
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185 s = os.stat(f).st_mode
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186 if (s & 0100 != 0) == mode:
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187 return
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188 if mode:
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189 # Turn on +x for every +r bit when making a file executable
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190 # and obey umask.
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191 umask = os.umask(0)
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192 os.umask(umask)
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193 os.chmod(f, s | (s & 0444) >> 2 & ~umask)
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194 else:
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195 os.chmod(f, s & 0666)
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196
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197 def pconvert(path):
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198 return path
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199
422
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200 def makelock(info, pathname):
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201 try:
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202 os.symlink(info, pathname)
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203 except OSError, why:
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204 if why.errno == errno.EEXIST:
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205 raise
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206 else:
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207 _makelock_file(info, pathname)
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208
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209 def readlock(pathname):
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210 try:
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211 return os.readlink(pathname)
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212 except OSError, why:
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213 if why.errno == errno.EINVAL:
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214 return _readlock_file(pathname)
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215 else:
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216 raise
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217
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218 def explain_exit(code):
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219 """return a 2-tuple (desc, code) describing a process's status"""
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220 if os.WIFEXITED(code):
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221 val = os.WEXITSTATUS(code)
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222 return "exited with status %d" % val, val
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223 elif os.WIFSIGNALED(code):
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224 val = os.WTERMSIG(code)
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225 return "killed by signal %d" % val, val
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226 elif os.WIFSTOPPED(code):
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227 val = os.STOPSIG(code)
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228 return "stopped by signal %d" % val, val
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229 raise ValueError("invalid exit code")