Mercurial > public > mercurial-scm > hg

annotate mercurial/util.py @ 814:0902ffece4b4

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Merge with BOS
author mpm@selenic.com
date Sat, 30 Jul 2005 09:00:14 -0800
parents 8f5637f0a0c0 b65af904d6d7
children 89985a1b3427 0932bc2fb2be 1fe3b14c7044
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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")