Mercurial > hg > mercurial-crew-with-dirclash
annotate hgext/extdiff.py @ 2577:fa76c5d609c9
bdiff: improve worst case behavior by 100x.
on 5.8MB (244.000 lines) text file with similar lines, hash before
this change made diff against empty file take 75 seconds. this change
improves performance to 0.6 seconds. result is that clone of smallish
repo (137MB) with some files like this takes 1 minute instead of 10
minutes.
common case of diff is 10% slower now, probably because of worse cache
locality. but diff does not affect overall performance in common case
(less than 1% of runtime is in diff when it is working ok), so this
tradeoff looks good.
author | Vadim Gelfer <vadim.gelfer@gmail.com> |
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date | Fri, 07 Jul 2006 15:02:55 -0700 |
parents | 391c5d0f9ef3 |
children | d99a92b7acad |
rev | line source |
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1 # extdiff.py - external diff program support for mercurial |
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2 # |
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3 # Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.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 # allow to use external programs to compare revisions, or revision |
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9 # with working dir. program is called with two arguments: paths to |
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10 # directories containing snapshots of files to compare. |
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11 # |
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12 # to enable: |
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13 # |
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14 # [extensions] |
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15 # hgext.extdiff = |
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16 # |
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17 # also allows to configure new diff commands, so you do not need to |
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18 # type "hg extdiff -p kdiff3" always. |
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19 # |
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20 # [extdiff] |
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21 # # add new command called vdiff, runs kdiff3 |
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22 # cmd.vdiff = kdiff3 |
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23 # # add new command called meld, runs meld (no need to name twice) |
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24 # cmd.meld = |
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25 # |
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26 # you can use -I/-X and list of file or directory names like normal |
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27 # "hg diff" command. extdiff makes snapshots of only needed files, so |
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28 # compare program will be fast. |
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29 |
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30 from mercurial.demandload import demandload |
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31 from mercurial.i18n import gettext as _ |
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32 from mercurial.node import * |
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33 demandload(globals(), 'mercurial:commands,util os shutil tempfile') |
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34 |
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35 def dodiff(ui, repo, diffcmd, pats, opts): |
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36 def snapshot_node(files, node): |
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37 '''snapshot files as of some revision''' |
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38 changes = repo.changelog.read(node) |
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39 mf = repo.manifest.read(changes[0]) |
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40 dirname = '%s.%s' % (os.path.basename(repo.root), short(node)) |
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41 base = os.path.join(tmproot, dirname) |
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42 os.mkdir(base) |
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43 if not ui.quiet: |
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44 ui.write_err(_('making snapshot of %d files from rev %s\n') % |
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45 (len(files), short(node))) |
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46 for fn in files: |
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47 wfn = util.pconvert(fn) |
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48 ui.note(' %s\n' % wfn) |
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49 dest = os.path.join(base, wfn) |
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50 destdir = os.path.dirname(dest) |
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51 if not os.path.isdir(destdir): |
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52 os.makedirs(destdir) |
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53 repo.wwrite(wfn, repo.file(fn).read(mf[fn]), open(dest, 'w')) |
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54 return dirname |
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55 |
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56 def snapshot_wdir(files): |
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57 '''snapshot files from working directory. |
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58 if not using snapshot, -I/-X does not work and recursive diff |
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59 in tools like kdiff3 and meld displays too many files.''' |
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60 dirname = os.path.basename(repo.root) |
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61 base = os.path.join(tmproot, dirname) |
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62 os.mkdir(base) |
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63 if not ui.quiet: |
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64 ui.write_err(_('making snapshot of %d files from working dir\n') % |
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65 (len(files))) |
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66 for fn in files: |
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67 wfn = util.pconvert(fn) |
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68 ui.note(' %s\n' % wfn) |
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69 dest = os.path.join(base, wfn) |
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70 destdir = os.path.dirname(dest) |
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71 if not os.path.isdir(destdir): |
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72 os.makedirs(destdir) |
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73 fp = open(dest, 'w') |
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74 for chunk in util.filechunkiter(repo.wopener(wfn)): |
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75 fp.write(chunk) |
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76 return dirname |
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77 |
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78 node1, node2 = commands.revpair(ui, repo, opts['rev']) |
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79 files, matchfn, anypats = commands.matchpats(repo, pats, opts) |
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80 modified, added, removed, deleted, unknown = repo.changes( |
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81 node1, node2, files, match=matchfn) |
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82 if not (modified or added or removed): |
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83 return 0 |
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84 |
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85 tmproot = tempfile.mkdtemp(prefix='extdiff.') |
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86 try: |
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87 dir1 = snapshot_node(modified + removed, node1) |
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88 if node2: |
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89 dir2 = snapshot_node(modified + added, node2) |
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90 else: |
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91 dir2 = snapshot_wdir(modified + added) |
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92 util.system('%s %s "%s" "%s"' % |
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93 (diffcmd, ' '.join(opts['option']), dir1, dir2), |
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94 cwd=tmproot) |
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95 return 1 |
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96 finally: |
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97 ui.note(_('cleaning up temp directory\n')) |
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98 shutil.rmtree(tmproot) |
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99 |
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100 def extdiff(ui, repo, *pats, **opts): |
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101 '''use external program to diff repository (or selected files) |
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102 |
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103 Show differences between revisions for the specified files, using |
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104 an external program. The default program used is "diff -Npru". |
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105 To select a different program, use the -p option. The program |
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106 will be passed the names of two directories to compare. To pass |
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107 additional options to the program, use the -o option. These will |
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108 be passed before the names of the directories to compare. |
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109 |
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110 When two revision arguments are given, then changes are |
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111 shown between those revisions. If only one revision is |
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112 specified then that revision is compared to the working |
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113 directory, and, when no revisions are specified, the |
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114 working directory files are compared to its parent.''' |
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115 return dodiff(ui, repo, opts['program'] or 'diff -Npru', pats, opts) |
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116 |
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117 cmdtable = { |
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118 "extdiff": |
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119 (extdiff, |
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120 [('p', 'program', '', _('comparison program to run')), |
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121 ('o', 'option', [], _('pass option to comparison program')), |
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122 ('r', 'rev', [], _('revision')), |
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123 ('I', 'include', [], _('include names matching the given patterns')), |
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124 ('X', 'exclude', [], _('exclude names matching the given patterns'))], |
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125 _('hg extdiff [OPT]... [FILE]...')), |
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126 } |
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127 |
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128 def uisetup(ui): |
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129 for cmd, path in ui.configitems('extdiff'): |
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130 if not cmd.startswith('cmd.'): continue |
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131 cmd = cmd[4:] |
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132 if not path: path = cmd |
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133 def save(cmd, path): |
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134 '''use closure to save diff command to use''' |
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135 def mydiff(ui, repo, *pats, **opts): |
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136 return dodiff(ui, repo, path, pats, opts) |
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137 mydiff.__doc__ = '''use %s to diff repository (or selected files) |
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138 |
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139 Show differences between revisions for the specified |
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140 files, using the %s program. |
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141 |
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142 When two revision arguments are given, then changes are |
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143 shown between those revisions. If only one revision is |
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144 specified then that revision is compared to the working |
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145 directory, and, when no revisions are specified, the |
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146 working directory files are compared to its parent.''' % (cmd, cmd) |
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147 return mydiff |
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148 cmdtable[cmd] = (save(cmd, path), |
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149 cmdtable['extdiff'][1][1:], |
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150 _('hg %s [OPT]... [FILE]...') % cmd) |