Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/util.py @ 869:1e3a23719662

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Kill dead function.
author Bryan O'Sullivan <bos@serpentine.com>
date Sun, 07 Aug 2005 11:09:21 -0800
parents 9c918287d10b
children a82eae840447
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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 patkind(name):
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73 for prefix in 're:', 'glob:', 'path:':
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74 if name.startswith(prefix): return name.split(':', 1)
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75 for c in name:
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76 if c in _globchars: return 'glob', name
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77 return 'relpath', name
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78
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79 cwdsep = cwd + os.sep
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80
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81 def regex(name, tail):
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82 '''convert a pattern into a regular expression'''
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83 kind, name = patkind(name)
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84 if kind == 're':
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85 return name
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86 elif kind == 'path':
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87 return '^' + re.escape(name) + '$'
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88 if cwd: name = os.path.join(cwdsep, name)
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89 name = os.path.normpath(name)
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90 if name == '.': name = '**'
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91 return head + globre(name, '', tail)
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92
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93 def matchfn(pats, tail):
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94 """build a matching function from a set of patterns"""
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95 if pats:
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96 pat = '(?:%s)' % '|'.join([regex(p, tail) for p in pats])
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97 return re.compile(pat).match
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98
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99 def globprefix(pat):
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100 '''return the non-glob prefix of a path, e.g. foo/* -> foo'''
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101 root = []
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102 for p in pat.split(os.sep):
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103 if patkind(p)[0] == 'glob': break
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104 root.append(p)
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105 return os.sep.join(root)
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106
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107 patkinds = map(patkind, names)
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108 pats = [name for (kind, name) in patkinds if kind != 'relpath']
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109 files = [name for (kind, name) in patkinds if kind == 'relpath']
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110 roots = filter(None, map(globprefix, pats)) + files
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111 if cwd: roots = [cwdsep + r for r in roots]
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112
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113 patmatch = matchfn(pats, '$') or always
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114 filematch = matchfn(files, '(?:/|$)') or always
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115 incmatch = matchfn(inc, '(?:/|$)') or always
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116 excmatch = matchfn(exc, '(?:/|$)') or (lambda fn: False)
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117
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118 return roots, lambda fn: (incmatch(fn) and not excmatch(fn) and
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119 (fn.endswith('/') or
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120 (not pats and not files) or
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121 (pats and patmatch(fn)) or
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122 (files and filematch(fn))))
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123
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124 def system(cmd, errprefix=None):
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125 """execute a shell command that must succeed"""
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126 rc = os.system(cmd)
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127 if rc:
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128 errmsg = "%s %s" % (os.path.basename(cmd.split(None, 1)[0]),
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129 explain_exit(rc)[0])
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130 if errprefix:
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131 errmsg = "%s: %s" % (errprefix, errmsg)
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132 raise CommandError(errmsg)
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133
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134 def rename(src, dst):
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135 try:
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136 os.rename(src, dst)
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137 except:
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138 os.unlink(dst)
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139 os.rename(src, dst)
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140
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141 def copytree(src, dst, copyfile):
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142 """Copy a directory tree, files are copied using 'copyfile'."""
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143 names = os.listdir(src)
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144 os.mkdir(dst)
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145
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146 for name in names:
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147 srcname = os.path.join(src, name)
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148 dstname = os.path.join(dst, name)
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149 if os.path.isdir(srcname):
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150 copytree(srcname, dstname, copyfile)
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151 elif os.path.isfile(srcname):
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152 copyfile(srcname, dstname)
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153 else:
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154 raise IOError("Not a regular file: %r" % srcname)
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155
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156 def _makelock_file(info, pathname):
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157 ld = os.open(pathname, os.O_CREAT | os.O_WRONLY | os.O_EXCL)
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158 os.write(ld, info)
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159 os.close(ld)
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160
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161 def _readlock_file(pathname):
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162 return file(pathname).read()
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163
421
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164 # Platfor specific varients
419
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165 if os.name == 'nt':
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166 nulldev = 'NUL:'
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167
441
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168 def is_exec(f, last):
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169 return last
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170
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171 def set_exec(f, mode):
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172 pass
515
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173
419
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174 def pconvert(path):
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175 return path.replace("\\", "/")
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176
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177 makelock = _makelock_file
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178 readlock = _readlock_file
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179
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180 def explain_exit(code):
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181 return "exited with status %d" % code, code
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182
419
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183 else:
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184 nulldev = '/dev/null'
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185
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186 def is_exec(f, last):
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187 return (os.stat(f).st_mode & 0100 != 0)
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188
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189 def set_exec(f, mode):
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190 s = os.stat(f).st_mode
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191 if (s & 0100 != 0) == mode:
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192 return
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193 if mode:
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194 # Turn on +x for every +r bit when making a file executable
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195 # and obey umask.
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196 umask = os.umask(0)
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197 os.umask(umask)
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198 os.chmod(f, s | (s & 0444) >> 2 & ~umask)
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199 else:
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200 os.chmod(f, s & 0666)
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201
419
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202 def pconvert(path):
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203 return path
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204
422
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205 def makelock(info, pathname):
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206 try:
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207 os.symlink(info, pathname)
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208 except OSError, why:
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209 if why.errno == errno.EEXIST:
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210 raise
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211 else:
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212 _makelock_file(info, pathname)
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213
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214 def readlock(pathname):
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215 try:
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216 return os.readlink(pathname)
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217 except OSError, why:
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218 if why.errno == errno.EINVAL:
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219 return _readlock_file(pathname)
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220 else:
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221 raise
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cdb9e95b2fab Provided platform dependent implementations for explain_exit
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222
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223 def explain_exit(code):
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224 """return a 2-tuple (desc, code) describing a process's status"""
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225 if os.WIFEXITED(code):
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226 val = os.WEXITSTATUS(code)
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227 return "exited with status %d" % val, val
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228 elif os.WIFSIGNALED(code):
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229 val = os.WTERMSIG(code)
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230 return "killed by signal %d" % val, val
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231 elif os.WIFSTOPPED(code):
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232 val = os.STOPSIG(code)
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233 return "stopped by signal %d" % val, val
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234 raise ValueError("invalid exit code")