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<title>src/Darcs/Commands/Rollback.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-- Copyright (C) 2002-2004,2007 David Roundy</span>
<a name="line-2"></a><span class='hs-comment'>--</span>
<a name="line-3"></a><span class='hs-comment'>-- This program is free software; you can redistribute it and/or modify</span>
<a name="line-4"></a><span class='hs-comment'>-- it under the terms of the GNU General Public License as published by</span>
<a name="line-5"></a><span class='hs-comment'>-- the Free Software Foundation; either version 2, or (at your option)</span>
<a name="line-6"></a><span class='hs-comment'>-- any later version.</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- This program is distributed in the hope that it will be useful,</span>
<a name="line-9"></a><span class='hs-comment'>-- but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="line-10"></a><span class='hs-comment'>-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="line-11"></a><span class='hs-comment'>-- GNU General Public License for more details.</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- You should have received a copy of the GNU General Public License</span>
<a name="line-14"></a><span class='hs-comment'>-- along with this program; see the file COPYING. If not, write to</span>
<a name="line-15"></a><span class='hs-comment'>-- the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,</span>
<a name="line-16"></a><span class='hs-comment'>-- Boston, MA 02110-1301, USA.</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-19"></a>
<a name="line-20"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Commands</span><span class='hs-varop'>.</span><span class='hs-conid'>Rollback</span> <span class='hs-layout'>(</span> <span class='hs-varid'>rollback</span> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span> <span class='hs-layout'>(</span> <span class='hs-layout'>(</span><span class='hs-varop'><$></span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span> <span class='hs-varid'>when</span> <span class='hs-layout'>)</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Exit</span> <span class='hs-layout'>(</span> <span class='hs-varid'>exitWith</span><span class='hs-layout'>,</span> <span class='hs-conid'>ExitCode</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-layout'>(</span> <span class='hs-varid'>sort</span> <span class='hs-layout'>)</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span> <span class='hs-varid'>isJust</span> <span class='hs-layout'>)</span>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Directory</span> <span class='hs-layout'>(</span> <span class='hs-varid'>removeFile</span> <span class='hs-layout'>)</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Commands</span> <span class='hs-layout'>(</span> <span class='hs-conid'>DarcsCommand</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>nodefaults</span> <span class='hs-layout'>)</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Arguments</span> <span class='hs-layout'>(</span> <span class='hs-conid'>DarcsFlag</span><span class='hs-layout'>(</span><span class='hs-conid'>MarkConflicts</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>fixSubPaths</span><span class='hs-layout'>,</span> <span class='hs-varid'>getAuthor</span><span class='hs-layout'>,</span>
<a name="line-31"></a> <span class='hs-varid'>setEnvDarcsPatches</span><span class='hs-layout'>,</span>
<a name="line-32"></a> <span class='hs-varid'>workingRepoDir</span><span class='hs-layout'>,</span> <span class='hs-varid'>nocompress</span><span class='hs-layout'>,</span>
<a name="line-33"></a> <span class='hs-varid'>author</span><span class='hs-layout'>,</span> <span class='hs-varid'>patchnameOption</span><span class='hs-layout'>,</span> <span class='hs-varid'>askLongComment</span><span class='hs-layout'>,</span>
<a name="line-34"></a> <span class='hs-varid'>leaveTestDir</span><span class='hs-layout'>,</span> <span class='hs-varid'>notest</span><span class='hs-layout'>,</span> <span class='hs-varid'>listRegisteredFiles</span><span class='hs-layout'>,</span>
<a name="line-35"></a> <span class='hs-varid'>matchSeveralOrLast</span><span class='hs-layout'>,</span> <span class='hs-varid'>allInteractive</span><span class='hs-layout'>,</span> <span class='hs-varid'>umaskOption</span><span class='hs-layout'>,</span>
<a name="line-36"></a> <span class='hs-varid'>recordRollback</span>
<a name="line-37"></a> <span class='hs-layout'>)</span>
<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>RepoPath</span> <span class='hs-layout'>(</span> <span class='hs-varid'>toFilePath</span> <span class='hs-layout'>)</span>
<a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Repository</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Repository</span><span class='hs-layout'>,</span> <span class='hs-varid'>amInHashedRepository</span><span class='hs-layout'>,</span> <span class='hs-varid'>withRepoLock</span><span class='hs-layout'>,</span> <span class='hs-conid'>RepoJob</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-40"></a> <span class='hs-varid'>applyToWorking</span><span class='hs-layout'>,</span>
<a name="line-41"></a> <span class='hs-varid'>readRepo</span><span class='hs-layout'>,</span>
<a name="line-42"></a> <span class='hs-varid'>tentativelyMergePatches</span><span class='hs-layout'>,</span> <span class='hs-varid'>withGutsOf</span><span class='hs-layout'>,</span>
<a name="line-43"></a> <span class='hs-varid'>testTentative</span><span class='hs-layout'>,</span>
<a name="line-44"></a> <span class='hs-varid'>finalizeRepositoryChanges</span><span class='hs-layout'>,</span> <span class='hs-varid'>invalidateIndex</span><span class='hs-layout'>,</span>
<a name="line-45"></a> <span class='hs-varid'>tentativelyAddToPending</span><span class='hs-layout'>,</span> <span class='hs-varid'>considerMergeToWorking</span>
<a name="line-46"></a> <span class='hs-layout'>)</span>
<a name="line-47"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span> <span class='hs-layout'>(</span> <span class='hs-conid'>RepoPatch</span><span class='hs-layout'>,</span> <span class='hs-varid'>summary</span><span class='hs-layout'>,</span> <span class='hs-varid'>invert</span><span class='hs-layout'>,</span> <span class='hs-varid'>namepatch</span><span class='hs-layout'>,</span> <span class='hs-varid'>effect</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromPrims</span><span class='hs-layout'>,</span>
<a name="line-48"></a> <span class='hs-varid'>sortCoalesceFL</span><span class='hs-layout'>,</span> <span class='hs-varid'>canonize</span><span class='hs-layout'>,</span> <span class='hs-varid'>anonymous</span><span class='hs-layout'>,</span> <span class='hs-conid'>PrimOf</span> <span class='hs-layout'>)</span>
<a name="line-49"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Apply</span><span class='hs-layout'>(</span> <span class='hs-conid'>ApplyState</span> <span class='hs-layout'>)</span>
<a name="line-50"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Flags</span> <span class='hs-layout'>(</span> <span class='hs-varid'>isInteractive</span><span class='hs-layout'>,</span> <span class='hs-varid'>rollbackInWorkingDir</span> <span class='hs-layout'>)</span>
<a name="line-51"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Set</span> <span class='hs-layout'>(</span> <span class='hs-conid'>PatchSet</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>newset2FL</span> <span class='hs-layout'>)</span>
<a name="line-52"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Split</span> <span class='hs-layout'>(</span> <span class='hs-varid'>reversePrimSplitter</span> <span class='hs-layout'>)</span>
<a name="line-53"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Witnesses</span><span class='hs-varop'>.</span><span class='hs-conid'>Ordered</span>
<a name="line-54"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>PatchInfoAnd</span> <span class='hs-layout'>(</span> <span class='hs-conid'>PatchInfoAnd</span><span class='hs-layout'>,</span> <span class='hs-varid'>n2pia</span> <span class='hs-layout'>)</span>
<a name="line-55"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Lock</span> <span class='hs-layout'>(</span> <span class='hs-varid'>worldReadableTemp</span> <span class='hs-layout'>)</span>
<a name="line-56"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Match</span> <span class='hs-layout'>(</span> <span class='hs-varid'>firstMatch</span> <span class='hs-layout'>)</span>
<a name="line-57"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>SelectChanges</span> <span class='hs-layout'>(</span> <span class='hs-varid'>selectChanges</span><span class='hs-layout'>,</span>
<a name="line-58"></a> <span class='hs-conid'>WhichChanges</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-59"></a> <span class='hs-varid'>selectionContext</span><span class='hs-layout'>,</span> <span class='hs-varid'>selectionContextPrim</span><span class='hs-layout'>,</span>
<a name="line-60"></a> <span class='hs-varid'>runSelection</span>
<a name="line-61"></a> <span class='hs-layout'>)</span>
<a name="line-62"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Commands</span><span class='hs-varop'>.</span><span class='hs-conid'>Record</span> <span class='hs-layout'>(</span> <span class='hs-varid'>getLog</span> <span class='hs-layout'>)</span>
<a name="line-63"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Commands</span><span class='hs-varop'>.</span><span class='hs-conid'>Unrecord</span> <span class='hs-layout'>(</span> <span class='hs-varid'>getLastPatches</span> <span class='hs-layout'>)</span>
<a name="line-64"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Commands</span><span class='hs-varop'>.</span><span class='hs-conid'>Util</span> <span class='hs-layout'>(</span> <span class='hs-varid'>announceFiles</span><span class='hs-layout'>,</span> <span class='hs-varid'>filterExistingFiles</span> <span class='hs-layout'>)</span>
<a name="line-65"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span> <span class='hs-layout'>(</span> <span class='hs-varid'>clarifyErrors</span><span class='hs-layout'>,</span> <span class='hs-conid'>PromptConfig</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>promptChar</span> <span class='hs-layout'>)</span>
<a name="line-66"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Printer</span> <span class='hs-layout'>(</span> <span class='hs-varid'>renderString</span> <span class='hs-layout'>)</span>
<a name="line-67"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Progress</span> <span class='hs-layout'>(</span> <span class='hs-varid'>debugMessage</span> <span class='hs-layout'>)</span>
<a name="line-68"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Witnesses</span><span class='hs-varop'>.</span><span class='hs-conid'>Sealed</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Sealed</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-69"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>IsoDate</span> <span class='hs-layout'>(</span> <span class='hs-varid'>getIsoDateTime</span> <span class='hs-layout'>)</span>
<a name="line-70"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Storage</span><span class='hs-varop'>.</span><span class='hs-conid'>Hashed</span><span class='hs-varop'>.</span><span class='hs-conid'>Tree</span><span class='hs-layout'>(</span> <span class='hs-conid'>Tree</span> <span class='hs-layout'>)</span>
<a name="line-71"></a><span class='hs-cpp'>#include "impossible.h"</span>
<a name="line-72"></a><span class='hs-cpp'>#include "gadts.h"</span>
<a name="line-73"></a>
<a name="line-74"></a><a name="rollbackDescription"></a><span class='hs-definition'>rollbackDescription</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-75"></a><span class='hs-definition'>rollbackDescription</span> <span class='hs-keyglyph'>=</span>
<a name="line-76"></a> <span class='hs-str'>"Record a new patch reversing some recorded changes."</span>
<a name="line-77"></a>
<a name="line-78"></a><a name="rollbackHelp"></a><span class='hs-definition'>rollbackHelp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-79"></a><span class='hs-definition'>rollbackHelp</span> <span class='hs-keyglyph'>=</span>
<a name="line-80"></a> <span class='hs-str'>"Rollback is used to undo the effects of one or more patches without actually\n"</span><span class='hs-varop'>++</span>
<a name="line-81"></a> <span class='hs-str'>"deleting them. Instead, it creates a new patch reversing selected portions.\n"</span><span class='hs-varop'>++</span>
<a name="line-82"></a> <span class='hs-str'>"of those changes. Unlike obliterate and unrecord (which accomplish a similar\n"</span><span class='hs-varop'>++</span>
<a name="line-83"></a> <span class='hs-str'>"goal) rollback is perfectly safe, since it leaves in the repository a record\n"</span><span class='hs-varop'>++</span>
<a name="line-84"></a> <span class='hs-str'>"of its changes.\n"</span>
<a name="line-85"></a>
<a name="line-86"></a><a name="rollback"></a><span class='hs-definition'>rollback</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DarcsCommand</span>
<a name="line-87"></a><span class='hs-definition'>rollback</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DarcsCommand</span> <span class='hs-layout'>{</span><span class='hs-varid'>commandProgramName</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"darcs"</span><span class='hs-layout'>,</span>
<a name="line-88"></a> <span class='hs-varid'>commandName</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"rollback"</span><span class='hs-layout'>,</span>
<a name="line-89"></a> <span class='hs-varid'>commandHelp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rollbackHelp</span><span class='hs-layout'>,</span>
<a name="line-90"></a> <span class='hs-varid'>commandDescription</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rollbackDescription</span><span class='hs-layout'>,</span>
<a name="line-91"></a> <span class='hs-varid'>commandExtraArgs</span> <span class='hs-keyglyph'>=</span> <span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>,</span>
<a name="line-92"></a> <span class='hs-varid'>commandExtraArgHelp</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-str'>"[FILE or DIRECTORY]..."</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span>
<a name="line-93"></a> <span class='hs-varid'>commandCommand</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rollbackCmd</span><span class='hs-layout'>,</span>
<a name="line-94"></a> <span class='hs-varid'>commandPrereq</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>amInHashedRepository</span><span class='hs-layout'>,</span>
<a name="line-95"></a> <span class='hs-varid'>commandGetArgPossibilities</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>listRegisteredFiles</span><span class='hs-layout'>,</span>
<a name="line-96"></a> <span class='hs-varid'>commandArgdefaults</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>nodefaults</span><span class='hs-layout'>,</span>
<a name="line-97"></a> <span class='hs-varid'>commandAdvancedOptions</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>nocompress</span><span class='hs-layout'>,</span><span class='hs-varid'>umaskOption</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span>
<a name="line-98"></a> <span class='hs-varid'>commandBasicOptions</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>matchSeveralOrLast</span><span class='hs-layout'>,</span>
<a name="line-99"></a> <span class='hs-varid'>allInteractive</span><span class='hs-layout'>,</span>
<a name="line-100"></a> <span class='hs-varid'>author</span><span class='hs-layout'>,</span> <span class='hs-varid'>patchnameOption</span><span class='hs-layout'>,</span> <span class='hs-varid'>askLongComment</span><span class='hs-layout'>,</span>
<a name="line-101"></a> <span class='hs-varid'>notest</span><span class='hs-layout'>,</span> <span class='hs-varid'>leaveTestDir</span><span class='hs-layout'>,</span>
<a name="line-102"></a> <span class='hs-varid'>workingRepoDir</span><span class='hs-layout'>,</span> <span class='hs-varid'>recordRollback</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>}</span>
<a name="line-103"></a>
<a name="line-104"></a><a name="rollbackCmd"></a><span class='hs-definition'>rollbackCmd</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DarcsFlag</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-105"></a><span class='hs-definition'>rollbackCmd</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>args</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withRepoLock</span> <span class='hs-varid'>opts</span> <span class='hs-varop'>$</span> <span class='hs-conid'>RepoJob</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>repository</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-106"></a> <span class='hs-varid'>files</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>args</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-107"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>.</span> <span class='hs-varid'>sort</span> <span class='hs-varop'><$></span> <span class='hs-varid'>fixSubPaths</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>args</span>
<a name="line-108"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>files</span> <span class='hs-varop'>==</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"No valid arguments were given."</span>
<a name="line-109"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>files_fp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>toFilePath</span> <span class='hs-varop'><$></span> <span class='hs-varid'>files</span>
<a name="line-110"></a> <span class='hs-varid'>announceFiles</span> <span class='hs-varid'>files</span> <span class='hs-str'>"Recording changes in"</span>
<a name="line-111"></a> <span class='hs-varid'>existing_files</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-112"></a> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>.</span> <span class='hs-varid'>filterExistingFiles</span> <span class='hs-varid'>repository</span><span class='hs-layout'>)</span> <span class='hs-varid'>files</span>
<a name="line-113"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>existing_files</span> <span class='hs-varop'>==</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-114"></a> <span class='hs-varid'>fail</span> <span class='hs-str'>"None of the files you specified exist!"</span>
<a name="line-115"></a> <span class='hs-varid'>allpatches</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readRepo</span> <span class='hs-varid'>repository</span>
<a name="line-116"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span> <span class='hs-conop'>:></span> <span class='hs-varid'>patches</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>firstMatch</span> <span class='hs-varid'>opts</span>
<a name="line-117"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>getLastPatches</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>allpatches</span>
<a name="line-118"></a> <span class='hs-keyword'>else</span> <span class='hs-layout'>(</span><span class='hs-conid'>PatchSet</span> <span class='hs-conid'>NilRL</span> <span class='hs-conid'>NilRL</span><span class='hs-layout'>)</span><span class='hs-conop'>:></span> <span class='hs-layout'>(</span><span class='hs-varid'>newset2FL</span> <span class='hs-varid'>allpatches</span><span class='hs-layout'>)</span>
<a name="line-119"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>patches_context</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>selectionContext</span> <span class='hs-str'>"rollback"</span> <span class='hs-varid'>opts</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>files_fp</span>
<a name="line-120"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span> <span class='hs-conop'>:></span> <span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runSelection</span> <span class='hs-layout'>(</span><span class='hs-varid'>selectChanges</span> <span class='hs-conid'>LastReversed</span> <span class='hs-varid'>patches</span><span class='hs-layout'>)</span> <span class='hs-varid'>patches_context</span>
<a name="line-121"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>nullFL</span> <span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>putStrLn</span> <span class='hs-str'>"No patches selected!"</span>
<a name="line-122"></a> <span class='hs-varid'>exitWith</span> <span class='hs-conid'>ExitSuccess</span>
<a name="line-123"></a> <span class='hs-varid'>setEnvDarcsPatches</span> <span class='hs-varid'>ps</span>
<a name="line-124"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>hunks_context</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>selectionContextPrim</span> <span class='hs-str'>"rollback"</span> <span class='hs-varid'>opts</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>reversePrimSplitter</span><span class='hs-layout'>)</span> <span class='hs-varid'>files_fp</span> <span class='hs-conid'>Nothing</span>
<a name="line-125"></a> <span class='hs-varid'>hunks</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>concatFL</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mapFL_FL</span> <span class='hs-varid'>canonize</span> <span class='hs-varop'>$</span> <span class='hs-varid'>sortCoalesceFL</span> <span class='hs-varop'>$</span> <span class='hs-varid'>effect</span> <span class='hs-varid'>ps</span><span class='hs-layout'>)</span>
<a name="line-126"></a> <span class='hs-varid'>runSelection</span> <span class='hs-layout'>(</span><span class='hs-varid'>selectChanges</span> <span class='hs-conid'>Last</span> <span class='hs-varid'>hunks</span><span class='hs-layout'>)</span> <span class='hs-varid'>hunks_context</span> <span class='hs-varop'>>>=</span>
<a name="line-127"></a> <span class='hs-keyword'>if</span> <span class='hs-layout'>(</span><span class='hs-varid'>rollbackInWorkingDir</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span>
<a name="line-128"></a> <span class='hs-keyword'>then</span> <span class='hs-layout'>(</span><span class='hs-varid'>undoItNow</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>repository</span><span class='hs-layout'>)</span>
<a name="line-129"></a> <span class='hs-keyword'>else</span> <span class='hs-layout'>(</span><span class='hs-varid'>rollItBackNow</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>repository</span> <span class='hs-varid'>ps</span><span class='hs-layout'>)</span>
<a name="line-130"></a>
<a name="line-131"></a><a name="rollItBackNow"></a><span class='hs-definition'>rollItBackNow</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>RepoPatch</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ApplyState</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>~</span> <span class='hs-conid'>Tree</span><span class='hs-layout'>,</span> <span class='hs-conid'>ApplyState</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>~</span> <span class='hs-conid'>Tree</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-132"></a> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DarcsFlag</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Repository</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varid'>u</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FL</span> <span class='hs-layout'>(</span><span class='hs-conid'>PatchInfoAnd</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-133"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>q</span> <span class='hs-conop'>:></span> <span class='hs-conid'>FL</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-134"></a><span class='hs-definition'>rollItBackNow</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>repository</span> <span class='hs-varid'>ps</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span> <span class='hs-conop'>:></span> <span class='hs-varid'>ps''</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-135"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>nullFL</span> <span class='hs-varid'>ps''</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>putStrLn</span> <span class='hs-str'>"No changes selected!"</span>
<a name="line-136"></a> <span class='hs-varid'>exitWith</span> <span class='hs-conid'>ExitSuccess</span>
<a name="line-137"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>make_log</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>worldReadableTemp</span> <span class='hs-str'>"darcs-rollback"</span>
<a name="line-138"></a> <span class='hs-varid'>newlog</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-str'>""</span><span class='hs-layout'>,</span> <span class='hs-str'>""</span><span class='hs-conop'>:</span><span class='hs-str'>"rolling back:"</span><span class='hs-conop'>:</span><span class='hs-str'>""</span><span class='hs-conop'>:</span><span class='hs-varid'>lines</span> <span class='hs-layout'>(</span><span class='hs-varid'>renderString</span> <span class='hs-varop'>$</span> <span class='hs-varid'>summary</span> <span class='hs-varid'>ps</span> <span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-139"></a> <span class='hs-comment'>--tentativelyRemovePatches repository opts (mapFL_FL hopefully ps)</span>
<a name="line-140"></a> <span class='hs-layout'>(</span><span class='hs-varid'>name</span><span class='hs-layout'>,</span> <span class='hs-varid'>my_log</span><span class='hs-layout'>,</span> <span class='hs-varid'>logf</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getLog</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>newlog</span> <span class='hs-varid'>make_log</span> <span class='hs-varop'>$</span> <span class='hs-varid'>invert</span> <span class='hs-varid'>ps''</span>
<a name="line-141"></a> <span class='hs-varid'>date</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getIsoDateTime</span>
<a name="line-142"></a> <span class='hs-varid'>my_author</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getAuthor</span> <span class='hs-varid'>opts</span>
<a name="line-143"></a> <span class='hs-varid'>rbp</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>n2pia</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>namepatch</span> <span class='hs-varid'>date</span> <span class='hs-varid'>name</span> <span class='hs-varid'>my_author</span> <span class='hs-varid'>my_log</span>
<a name="line-144"></a> <span class='hs-layout'>(</span><span class='hs-varid'>fromPrims</span> <span class='hs-varop'>$</span> <span class='hs-varid'>invert</span> <span class='hs-varid'>ps''</span><span class='hs-layout'>)</span>
<a name="line-145"></a> <span class='hs-varid'>debugMessage</span> <span class='hs-str'>"Adding rollback patch to repository."</span>
<a name="line-146"></a> <span class='hs-conid'>Sealed</span> <span class='hs-varid'>pw</span> <span class='hs-keyglyph'><-</span>
<a name="line-147"></a> <span class='hs-varid'>tentativelyMergePatches</span> <span class='hs-varid'>repository</span> <span class='hs-str'>"rollback"</span>
<a name="line-148"></a> <span class='hs-layout'>(</span><span class='hs-conid'>MarkConflicts</span> <span class='hs-conop'>:</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-conid'>NilFL</span>
<a name="line-149"></a> <span class='hs-layout'>(</span><span class='hs-varid'>rbp</span> <span class='hs-conop'>:>:</span> <span class='hs-conid'>NilFL</span><span class='hs-layout'>)</span>
<a name="line-150"></a> <span class='hs-varid'>debugMessage</span> <span class='hs-str'>"Finalizing rollback changes..."</span>
<a name="line-151"></a> <span class='hs-varid'>invalidateIndex</span> <span class='hs-varid'>repository</span>
<a name="line-152"></a> <span class='hs-varid'>rc</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>testTentative</span> <span class='hs-varid'>repository</span>
<a name="line-153"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>rc</span> <span class='hs-varop'>/=</span> <span class='hs-conid'>ExitSuccess</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-154"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varop'>$</span> <span class='hs-varid'>isInteractive</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>exitWith</span> <span class='hs-varid'>rc</span>
<a name="line-155"></a> <span class='hs-varid'>putStrLn</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Looks like you have a bad patch: '"</span><span class='hs-varop'>++</span><span class='hs-varid'>name</span><span class='hs-varop'>++</span><span class='hs-str'>"'"</span>
<a name="line-156"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>prompt</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Shall I rollback anyway?"</span>
<a name="line-157"></a> <span class='hs-varid'>yn</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>promptChar</span> <span class='hs-layout'>(</span><span class='hs-conid'>PromptConfig</span> <span class='hs-varid'>prompt</span> <span class='hs-str'>"yn"</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-chr'>'n'</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-158"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>yn</span> <span class='hs-keyword'>of</span>
<a name="line-159"></a> <span class='hs-chr'>'y'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-160"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>exitWith</span> <span class='hs-varid'>rc</span>
<a name="line-161"></a> <span class='hs-varid'>withGutsOf</span> <span class='hs-varid'>repository</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-162"></a> <span class='hs-varid'>finalizeRepositoryChanges</span> <span class='hs-varid'>repository</span>
<a name="line-163"></a> <span class='hs-varid'>debugMessage</span> <span class='hs-str'>"About to apply rolled-back changes to working directory."</span>
<a name="line-164"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>revertable</span> <span class='hs-varop'>$</span> <span class='hs-varid'>applyToWorking</span> <span class='hs-varid'>repository</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>pw</span>
<a name="line-165"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-166"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>isJust</span> <span class='hs-varid'>logf</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>removeFile</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromJust</span> <span class='hs-varid'>logf</span><span class='hs-layout'>)</span>
<a name="line-167"></a> <span class='hs-varid'>putStrLn</span> <span class='hs-str'>"Finished rolling back."</span>
<a name="line-168"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>revertable</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>`clarifyErrors`</span> <span class='hs-varid'>unlines</span>
<a name="line-169"></a> <span class='hs-keyglyph'>[</span><span class='hs-str'>"Error applying patch to the working directory."</span><span class='hs-layout'>,</span><span class='hs-str'>""</span><span class='hs-layout'>,</span>
<a name="line-170"></a> <span class='hs-str'>"This may have left your working directory an inconsistent"</span><span class='hs-layout'>,</span>
<a name="line-171"></a> <span class='hs-str'>"but recoverable state. If you had no un-recorded changes"</span><span class='hs-layout'>,</span>
<a name="line-172"></a> <span class='hs-str'>"by using 'darcs revert' you should be able to make your"</span><span class='hs-layout'>,</span>
<a name="line-173"></a> <span class='hs-str'>"working directory consistent again."</span><span class='hs-keyglyph'>]</span>
<a name="line-174"></a>
<a name="line-175"></a><a name="undoItNow"></a><span class='hs-definition'>undoItNow</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>RepoPatch</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ApplyState</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>~</span> <span class='hs-conid'>Tree</span><span class='hs-layout'>,</span> <span class='hs-conid'>ApplyState</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>~</span> <span class='hs-conid'>Tree</span><span class='hs-layout'>)</span>
<a name="line-176"></a> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DarcsFlag</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Repository</span> <span class='hs-varid'>p</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varid'>u</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-177"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>q</span> <span class='hs-conop'>:></span> <span class='hs-conid'>FL</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimOf</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-178"></a><span class='hs-definition'>undoItNow</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>repo</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span> <span class='hs-conop'>:></span> <span class='hs-varid'>prims</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-179"></a> <span class='hs-keyword'>do</span>
<a name="line-180"></a> <span class='hs-varid'>rbp</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>n2pia</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>anonymous</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromPrims</span> <span class='hs-varop'>$</span> <span class='hs-varid'>invert</span> <span class='hs-varid'>prims</span><span class='hs-layout'>)</span>
<a name="line-181"></a> <span class='hs-conid'>Sealed</span> <span class='hs-varid'>pw</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>considerMergeToWorking</span> <span class='hs-varid'>repo</span> <span class='hs-str'>"rollback"</span> <span class='hs-layout'>(</span><span class='hs-conid'>MarkConflicts</span><span class='hs-conop'>:</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span>
<a name="line-182"></a> <span class='hs-conid'>NilFL</span> <span class='hs-layout'>(</span><span class='hs-varid'>rbp</span> <span class='hs-conop'>:>:</span> <span class='hs-conid'>NilFL</span><span class='hs-layout'>)</span>
<a name="line-183"></a> <span class='hs-varid'>tentativelyAddToPending</span> <span class='hs-varid'>repo</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>pw</span>
<a name="line-184"></a> <span class='hs-varid'>withGutsOf</span> <span class='hs-varid'>repo</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-185"></a> <span class='hs-varid'>finalizeRepositoryChanges</span> <span class='hs-varid'>repo</span>
<a name="line-186"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>applyToWorking</span> <span class='hs-varid'>repo</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>pw</span> <span class='hs-varop'>`catch`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span>
<a name="line-187"></a> <span class='hs-varid'>fail</span> <span class='hs-layout'>(</span><span class='hs-str'>"error applying rolled back patch to working directory\n"</span>
<a name="line-188"></a> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-189"></a> <span class='hs-varid'>debugMessage</span> <span class='hs-str'>"Finished applying unrecorded rollback patch"</span>
<a name="line-190"></a>
</pre></body>
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