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<title>src/Darcs/Commands/Revert.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-- Copyright (C) 2002-2005 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-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'>Revert</span> <span class='hs-layout'>(</span> <span class='hs-varid'>revert</span> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-19"></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-conid'>ExitCode</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'>exitWith</span> <span class='hs-layout'>)</span>
<a name="line-20"></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-21"></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-22"></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-23"></a>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>English</span> <span class='hs-layout'>(</span><span class='hs-varid'>englishNum</span><span class='hs-layout'>,</span> <span class='hs-conid'>This</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Noun</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'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Flags</span><span class='hs-layout'>(</span> <span class='hs-varid'>diffingOpts</span> <span class='hs-layout'>)</span>
<a name="line-26"></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-27"></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>
<a name="line-28"></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'>All</span><span class='hs-layout'>,</span> <span class='hs-conid'>Debug</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-29"></a> <span class='hs-varid'>ignoretimes</span><span class='hs-layout'>,</span> <span class='hs-varid'>workingRepoDir</span><span class='hs-layout'>,</span>
<a name="line-30"></a> <span class='hs-varid'>allInteractive</span><span class='hs-layout'>,</span>
<a name="line-31"></a> <span class='hs-varid'>fixSubPaths</span><span class='hs-layout'>,</span>
<a name="line-32"></a> <span class='hs-varid'>listRegisteredFiles</span><span class='hs-layout'>,</span> <span class='hs-varid'>umaskOption</span><span class='hs-layout'>,</span> <span class='hs-varid'>unified</span>
<a name="line-33"></a> <span class='hs-layout'>)</span>
<a name="line-34"></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'>askUser</span> <span class='hs-layout'>)</span>
<a name="line-35"></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-36"></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-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> <span class='hs-varid'>withGutsOf</span><span class='hs-layout'>,</span>
<a name="line-37"></a> <span class='hs-varid'>addToPending</span><span class='hs-layout'>,</span>
<a name="line-38"></a> <span class='hs-varid'>applyToWorking</span><span class='hs-layout'>,</span>
<a name="line-39"></a> <span class='hs-varid'>amInHashedRepository</span><span class='hs-layout'>,</span> <span class='hs-varid'>readRecorded</span><span class='hs-layout'>,</span>
<a name="line-40"></a> <span class='hs-varid'>unrecordedChanges</span>
<a name="line-41"></a> <span class='hs-layout'>)</span>
<a name="line-42"></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-varid'>invert</span><span class='hs-layout'>,</span> <span class='hs-varid'>effectOnFilePaths</span><span class='hs-layout'>,</span> <span class='hs-varid'>commute</span> <span class='hs-layout'>)</span>
<a name="line-43"></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-44"></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> <span class='hs-layout'>(</span> <span class='hs-conid'>FL</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conop'>:></span><span class='hs-layout'>)</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'>lengthFL</span><span class='hs-layout'>,</span> <span class='hs-varid'>nullFL</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-45"></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> <span class='hs-conid'>WhichChanges</span><span class='hs-layout'>(</span><span class='hs-conid'>Last</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>selectionContextPrim</span><span class='hs-layout'>,</span> <span class='hs-varid'>runSelection</span> <span class='hs-layout'>)</span>
<a name="line-46"></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'>TouchesFiles</span> <span class='hs-layout'>(</span> <span class='hs-varid'>chooseTouching</span> <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'>Commands</span><span class='hs-varop'>.</span><span class='hs-conid'>Unrevert</span> <span class='hs-layout'>(</span> <span class='hs-varid'>writeUnrevert</span> <span class='hs-layout'>)</span>
<a name="line-48"></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-49"></a>
<a name="line-50"></a><span class='hs-cpp'>#include "gadts.h"</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="revertDescription"></a><span class='hs-definition'>revertDescription</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-53"></a><span class='hs-definition'>revertDescription</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Discard unrecorded changes."</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="revertHelp"></a><span class='hs-definition'>revertHelp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-56"></a><span class='hs-definition'>revertHelp</span> <span class='hs-keyglyph'>=</span>
<a name="line-57"></a> <span class='hs-str'>"The `darcs revert' command discards unrecorded changes the working\n"</span> <span class='hs-varop'>++</span>
<a name="line-58"></a> <span class='hs-str'>"tree. As with `darcs record', you will be asked which hunks (changes)\n"</span> <span class='hs-varop'>++</span>
<a name="line-59"></a> <span class='hs-str'>"to revert. The --all switch can be used to avoid such prompting. If\n"</span> <span class='hs-varop'>++</span>
<a name="line-60"></a> <span class='hs-str'>"files or directories are specified, other parts of the working tree\n"</span> <span class='hs-varop'>++</span>
<a name="line-61"></a> <span class='hs-str'>"are not reverted.\n"</span> <span class='hs-varop'>++</span>
<a name="line-62"></a> <span class='hs-str'>"\n"</span> <span class='hs-varop'>++</span>
<a name="line-63"></a> <span class='hs-str'>"In you accidentally reverted something you wanted to keep (for\n"</span> <span class='hs-varop'>++</span>
<a name="line-64"></a> <span class='hs-str'>"example, typing `darcs rev -a' instead of `darcs rec -a'), you can\n"</span> <span class='hs-varop'>++</span>
<a name="line-65"></a> <span class='hs-str'>"immediately run `darcs unrevert' to restore it. This is only\n"</span> <span class='hs-varop'>++</span>
<a name="line-66"></a> <span class='hs-str'>"guaranteed to work if the repository has not changed since `darcs\n"</span> <span class='hs-varop'>++</span>
<a name="line-67"></a> <span class='hs-str'>"revert' ran.\n"</span>
<a name="line-68"></a>
<a name="line-69"></a><a name="revert"></a><span class='hs-definition'>revert</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DarcsCommand</span>
<a name="line-70"></a><span class='hs-definition'>revert</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-71"></a> <span class='hs-varid'>commandName</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"revert"</span><span class='hs-layout'>,</span>
<a name="line-72"></a> <span class='hs-varid'>commandHelp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>revertHelp</span><span class='hs-layout'>,</span>
<a name="line-73"></a> <span class='hs-varid'>commandDescription</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>revertDescription</span><span class='hs-layout'>,</span>
<a name="line-74"></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-75"></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-76"></a> <span class='hs-varid'>commandCommand</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>revertCmd</span><span class='hs-layout'>,</span>
<a name="line-77"></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-78"></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-79"></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-80"></a> <span class='hs-varid'>commandAdvancedOptions</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>ignoretimes</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-81"></a> <span class='hs-varid'>commandBasicOptions</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>allInteractive</span><span class='hs-layout'>,</span> <span class='hs-varid'>unified</span><span class='hs-layout'>,</span>
<a name="line-82"></a> <span class='hs-varid'>workingRepoDir</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>}</span>
<a name="line-83"></a>
<a name="line-84"></a><a name="revertCmd"></a><span class='hs-definition'>revertCmd</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-85"></a><span class='hs-definition'>revertCmd</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'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>repository</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-86"></a> <span class='hs-varid'>files</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>args</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-87"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>.</span> <span class='hs-varid'>sort</span> <span class='hs-varop'><$></span> <span class='hs-varid'>fixSubPaths</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>args</span>
<a name="line-88"></a> <span class='hs-varid'>announceFiles</span> <span class='hs-varid'>files</span> <span class='hs-str'>"Reverting changes in"</span>
<a name="line-89"></a> <span class='hs-varid'>changes</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unrecordedChanges</span> <span class='hs-layout'>(</span><span class='hs-varid'>diffingOpts</span> <span class='hs-varid'>opts</span> <span class='hs-comment'>{- always ScanKnown here -}</span><span class='hs-layout'>)</span> <span class='hs-varid'>repository</span> <span class='hs-varid'>files</span>
<a name="line-90"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>pre_changed_files</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>effectOnFilePaths</span> <span class='hs-layout'>(</span><span class='hs-varid'>invert</span> <span class='hs-varid'>changes</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</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-91"></a> <span class='hs-varid'>rec</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readRecorded</span> <span class='hs-varid'>repository</span>
<a name="line-92"></a> <span class='hs-conid'>Sealed</span> <span class='hs-varid'>touching_changes</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>chooseTouching</span> <span class='hs-varid'>pre_changed_files</span> <span class='hs-varid'>changes</span><span class='hs-layout'>)</span>
<a name="line-93"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>case</span> <span class='hs-varid'>touching_changes</span> <span class='hs-keyword'>of</span>
<a name="line-94"></a> <span class='hs-conid'>NilFL</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>putStrLn</span> <span class='hs-str'>"There are no changes to revert!"</span>
<a name="line-95"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-96"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>context</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>selectionContextPrim</span> <span class='hs-str'>"revert"</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'>pre_changed_files</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>rec</span><span class='hs-layout'>)</span>
<a name="line-97"></a> <span class='hs-layout'>(</span><span class='hs-varid'>norevert</span><span class='hs-conop'>:></span><span class='hs-varid'>p</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'>Last</span> <span class='hs-varid'>changes</span><span class='hs-layout'>)</span> <span class='hs-varid'>context</span>
<a name="line-98"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>nullFL</span> <span class='hs-varid'>p</span>
<a name="line-99"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>putStrLn</span> <span class='hs-varop'>$</span> <span class='hs-str'>"If you don't want to revert after all,"</span> <span class='hs-varop'>++</span>
<a name="line-100"></a> <span class='hs-str'>" that's fine with me!"</span>
<a name="line-101"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span>
<a name="line-102"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>theseChanges</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>englishNum</span> <span class='hs-layout'>(</span><span class='hs-varid'>lengthFL</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-conid'>This</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Noun</span> <span class='hs-varop'>$</span> <span class='hs-str'>"change"</span>
<a name="line-103"></a> <span class='hs-varid'>yorn</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>if</span> <span class='hs-conid'>All</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>opts</span>
<a name="line-104"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-str'>"y"</span>
<a name="line-105"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>askUser</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Do you really want to revert "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>theseChanges</span> <span class='hs-str'>"? "</span>
<a name="line-106"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>yorn</span> <span class='hs-keyword'>of</span> <span class='hs-layout'>(</span><span class='hs-chr'>'y'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-107"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>exitWith</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ExitSuccess</span>
<a name="line-108"></a> <span class='hs-varid'>withGutsOf</span> <span class='hs-varid'>repository</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-109"></a> <span class='hs-varid'>addToPending</span> <span class='hs-varid'>repository</span> <span class='hs-varop'>$</span> <span class='hs-varid'>invert</span> <span class='hs-varid'>p</span>
<a name="line-110"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-conid'>Debug</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>putStrLn</span> <span class='hs-str'>"About to write the unrevert file."</span>
<a name="line-111"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>commute</span> <span class='hs-layout'>(</span><span class='hs-varid'>norevert</span><span class='hs-conop'>:></span><span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-112"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>p'</span><span class='hs-conop'>:></span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>writeUnrevert</span> <span class='hs-varid'>repository</span> <span class='hs-varid'>p'</span> <span class='hs-varid'>rec</span> <span class='hs-conid'>NilFL</span>
<a name="line-113"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>writeUnrevert</span> <span class='hs-varid'>repository</span> <span class='hs-layout'>(</span><span class='hs-varid'>norevert</span><span class='hs-varop'>+>+</span><span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-varid'>rec</span> <span class='hs-conid'>NilFL</span>
<a name="line-114"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-conid'>Debug</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>putStrLn</span> <span class='hs-str'>"About to apply to the working directory."</span>
<a name="line-115"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>applyToWorking</span> <span class='hs-varid'>repository</span> <span class='hs-varid'>opts</span> <span class='hs-layout'>(</span><span class='hs-varid'>invert</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</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-116"></a> <span class='hs-varid'>fail</span> <span class='hs-layout'>(</span><span class='hs-str'>"Unable to apply inverse patch!"</span> <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-117"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>()</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-118"></a> <span class='hs-varid'>putStrLn</span> <span class='hs-str'>"Finished reverting."</span>
<a name="line-119"></a>
</pre></body>
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