annotate mercurial/util.py @ 808:8f5637f0a0c0

Merge with TAH
author mpm@selenic.com
date Sat, 30 Jul 2005 08:35:29 -0800
parents cdb9e95b2fab 445970ccf57a
children 0902ffece4b4
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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 def matcher(cwd, pats, inc, exc, head = ''):
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70 def regex(name, tail):
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71 '''convert a pattern into a regular expression'''
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72 if name.startswith('re:'):
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73 return name[3:]
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74 elif name.startswith('path:'):
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75 return '^' + re.escape(name[5:]) + '$'
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76 elif name.startswith('glob:'):
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77 return head + globre(name[5:], '', tail)
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78 return head + globre(name, '', tail)
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79
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80 def under(fn):
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81 """check if fn is under our cwd"""
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82 return not cwd or fn.startswith(cwdsep)
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83
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84 def matchfn(pats, tail):
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85 """build a matching function from a set of patterns"""
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86 if pats:
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87 pat = '(?:%s)' % '|'.join([regex(p, tail) for p in pats])
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88 if cwd:
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89 pat = re.escape(cwd + os.sep) + pat
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90 return re.compile(pat).match
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91
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92 cwdsep = cwd + os.sep
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93 patmatch = matchfn(pats, '$') or (lambda fn: True)
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94 incmatch = matchfn(inc, '(?:/|$)') or under
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95 excmatch = matchfn(exc, '(?:/|$)') or (lambda fn: False)
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96
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97 return lambda fn: (incmatch(fn) and not excmatch(fn) and
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98 (fn.endswith('/') or patmatch(fn)))
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99
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100 def system(cmd, errprefix=None):
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101 """execute a shell command that must succeed"""
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102 rc = os.system(cmd)
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103 if rc:
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104 errmsg = "%s %s" % (os.path.basename(cmd.split(None, 1)[0]),
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105 explain_exit(rc)[0])
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106 if errprefix:
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107 errmsg = "%s: %s" % (errprefix, errmsg)
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108 raise CommandError(errmsg)
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109
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110 def rename(src, dst):
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111 try:
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112 os.rename(src, dst)
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113 except:
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114 os.unlink(dst)
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115 os.rename(src, dst)
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116
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117 def copytree(src, dst, copyfile):
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118 """Copy a directory tree, files are copied using 'copyfile'."""
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119 names = os.listdir(src)
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120 os.mkdir(dst)
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121
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122 for name in names:
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123 srcname = os.path.join(src, name)
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124 dstname = os.path.join(dst, name)
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125 if os.path.isdir(srcname):
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126 copytree(srcname, dstname, copyfile)
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127 elif os.path.isfile(srcname):
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128 copyfile(srcname, dstname)
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129 else:
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130 raise IOError("Not a regular file: %r" % srcname)
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131
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132 def _makelock_file(info, pathname):
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133 ld = os.open(pathname, os.O_CREAT | os.O_WRONLY | os.O_EXCL)
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134 os.write(ld, info)
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135 os.close(ld)
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136
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137 def _readlock_file(pathname):
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138 return file(pathname).read()
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139
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140 # Platfor specific varients
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141 if os.name == 'nt':
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142 nulldev = 'NUL:'
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143
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144 def is_exec(f, last):
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145 return last
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146
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147 def set_exec(f, mode):
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148 pass
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149
419
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150 def pconvert(path):
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151 return path.replace("\\", "/")
422
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152
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153 makelock = _makelock_file
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154 readlock = _readlock_file
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155
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156 def explain_exit(code):
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157 return "exited with status %d" % code, code
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158
419
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159 else:
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160 nulldev = '/dev/null'
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161
441
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162 def is_exec(f, last):
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163 return (os.stat(f).st_mode & 0100 != 0)
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164
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165 def set_exec(f, mode):
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166 s = os.stat(f).st_mode
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167 if (s & 0100 != 0) == mode:
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168 return
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169 if mode:
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170 # Turn on +x for every +r bit when making a file executable
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171 # and obey umask.
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172 umask = os.umask(0)
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173 os.umask(umask)
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174 os.chmod(f, s | (s & 0444) >> 2 & ~umask)
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175 else:
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176 os.chmod(f, s & 0666)
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177
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178 def pconvert(path):
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179 return path
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180
422
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181 def makelock(info, pathname):
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182 try:
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183 os.symlink(info, pathname)
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184 except OSError, why:
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185 if why.errno == errno.EEXIST:
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186 raise
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187 else:
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188 _makelock_file(info, pathname)
422
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189
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190 def readlock(pathname):
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191 try:
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192 return os.readlink(pathname)
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193 except OSError, why:
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194 if why.errno == errno.EINVAL:
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195 return _readlock_file(pathname)
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196 else:
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197 raise
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198
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199 def explain_exit(code):
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200 """return a 2-tuple (desc, code) describing a process's status"""
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201 if os.WIFEXITED(code):
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202 val = os.WEXITSTATUS(code)
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203 return "exited with status %d" % val, val
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204 elif os.WIFSIGNALED(code):
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205 val = os.WTERMSIG(code)
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206 return "killed by signal %d" % val, val
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207 elif os.WIFSTOPPED(code):
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208 val = os.STOPSIG(code)
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209 return "stopped by signal %d" % val, val
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210 raise ValueError("invalid exit code")