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<title>src/Darcs/Commands/Unrevert.lhs</title>
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% Copyright (C) 2003-2005 David Roundy
%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 2, or (at your option)
% any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program; see the file COPYING. If not, write to
% the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
% Boston, MA 02110-1301, USA.
\darcsCommand{unrevert}
\begin{code}
<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS_GHC -cpp #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE CPP, GADTs #-}</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-cpp'>#include "gadts.h"</span>
<a name="line-5"></a>
<a name="line-6"></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'>Unrevert</span> <span class='hs-layout'>(</span> <span class='hs-varid'>unrevert</span><span class='hs-layout'>,</span> <span class='hs-varid'>writeUnrevert</span> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-7"></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-8"></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-9"></a>
<a name="line-10"></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-11"></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'>Unified</span><span class='hs-layout'>,</span> <span class='hs-conid'>MarkConflicts</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-12"></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-13"></a> <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-14"></a> <span class='hs-layout'>)</span>
<a name="line-15"></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'>SealedPatchSet</span><span class='hs-layout'>,</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-layout'>(</span><span class='hs-varop'>$-</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-16"></a> <span class='hs-varid'>unrevertUrl</span><span class='hs-layout'>,</span> <span class='hs-varid'>considerMergeToWorking</span><span class='hs-layout'>,</span>
<a name="line-17"></a> <span class='hs-varid'>tentativelyAddToPending</span><span class='hs-layout'>,</span> <span class='hs-varid'>finalizeRepositoryChanges</span><span class='hs-layout'>,</span>
<a name="line-18"></a> <span class='hs-varid'>read_repo</span><span class='hs-layout'>,</span> <span class='hs-varid'>amInRepository</span><span class='hs-layout'>,</span>
<a name="line-19"></a> <span class='hs-varid'>readRecorded</span><span class='hs-layout'>,</span>
<a name="line-20"></a> <span class='hs-varid'>applyToWorking</span><span class='hs-layout'>,</span> <span class='hs-varid'>unrecordedChanges</span> <span class='hs-layout'>)</span>
<a name="line-21"></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-conid'>Prim</span><span class='hs-layout'>,</span> <span class='hs-varid'>commute</span><span class='hs-layout'>,</span> <span class='hs-varid'>namepatch</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromPrims</span> <span class='hs-layout'>)</span>
<a name="line-22"></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-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'>reverseRL</span><span class='hs-layout'>,</span>
<a name="line-23"></a> <span class='hs-layout'>(</span><span class='hs-varop'>+>+</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-24"></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'>with_selected_changes_to_files'</span> <span class='hs-layout'>)</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>B</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'>Lock</span> <span class='hs-layout'>(</span> <span class='hs-varid'>writeDocBinFile</span><span class='hs-layout'>,</span> <span class='hs-varid'>removeFileMayNotExist</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'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Depends</span> <span class='hs-layout'>(</span> <span class='hs-varid'>get_common_and_uncommon</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'>Utils</span> <span class='hs-layout'>(</span> <span class='hs-varid'>askUser</span><span class='hs-layout'>,</span> <span class='hs-varid'>catchall</span> <span class='hs-layout'>)</span>
<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'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>Bundle</span> <span class='hs-layout'>(</span> <span class='hs-varid'>scan_bundle</span><span class='hs-layout'>,</span> <span class='hs-varid'>make_bundle</span> <span class='hs-layout'>)</span>
<a name="line-30"></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-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>SignalHandler</span> <span class='hs-layout'>(</span> <span class='hs-varid'>withSignalsBlocked</span> <span class='hs-layout'>)</span>
<a name="line-32"></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-33"></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-conid'>Sealed</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-34"></a><span class='hs-cpp'>#include "impossible.h"</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="unrevertDescription"></a><span class='hs-definition'>unrevertDescription</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-37"></a><span class='hs-definition'>unrevertDescription</span> <span class='hs-keyglyph'>=</span>
<a name="line-38"></a> <span class='hs-str'>"Undo the last revert (may fail if changes after the revert)."</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="unrevertHelp"></a><span class='hs-definition'>unrevertHelp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-41"></a><span class='hs-definition'>unrevertHelp</span> <span class='hs-keyglyph'>=</span>
<a name="line-42"></a> <span class='hs-str'>"Unrevert is a rescue command in case you accidentally reverted\n"</span> <span class='hs-varop'>++</span>
<a name="line-43"></a> <span class='hs-str'>"something you wanted to keep (for example, typing `darcs rev -a'\n"</span> <span class='hs-varop'>++</span>
<a name="line-44"></a> <span class='hs-str'>"instead of `darcs rec -a').\n"</span> <span class='hs-varop'>++</span>
<a name="line-45"></a> <span class='hs-str'>"\n"</span> <span class='hs-varop'>++</span>
<a name="line-46"></a> <span class='hs-str'>"This command may fail if the repository has changed since the revert\n"</span> <span class='hs-varop'>++</span>
<a name="line-47"></a> <span class='hs-str'>"took place. Darcs will ask for confirmation before executing an\n"</span> <span class='hs-varop'>++</span>
<a name="line-48"></a> <span class='hs-str'>"interactive command that will DEFINITELY prevent unreversion.\n"</span>
<a name="line-49"></a>
<a name="line-50"></a><a name="unrevert"></a><span class='hs-definition'>unrevert</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DarcsCommand</span>
<a name="line-51"></a><span class='hs-definition'>unrevert</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DarcsCommand</span> <span class='hs-layout'>{</span><span class='hs-varid'>commandName</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"unrevert"</span><span class='hs-layout'>,</span>
<a name="line-52"></a> <span class='hs-varid'>commandHelp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unrevertHelp</span><span class='hs-layout'>,</span>
<a name="line-53"></a> <span class='hs-varid'>commandDescription</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unrevertDescription</span><span class='hs-layout'>,</span>
<a name="line-54"></a> <span class='hs-varid'>commandExtraArgs</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span><span class='hs-layout'>,</span>
<a name="line-55"></a> <span class='hs-varid'>commandExtraArgHelp</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span><span class='hs-layout'>,</span>
<a name="line-56"></a> <span class='hs-varid'>commandCommand</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unrevertCmd</span><span class='hs-layout'>,</span>
<a name="line-57"></a> <span class='hs-varid'>commandPrereq</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>amInRepository</span><span class='hs-layout'>,</span>
<a name="line-58"></a> <span class='hs-varid'>commandGetArgPossibilities</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span><span class='hs-layout'>,</span>
<a name="line-59"></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-60"></a> <span class='hs-varid'>commandAdvancedOptions</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>umaskOption</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span>
<a name="line-61"></a> <span class='hs-varid'>commandBasicOptions</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>ignoretimes</span><span class='hs-layout'>,</span>
<a name="line-62"></a> <span class='hs-varid'>allInteractive</span><span class='hs-layout'>,</span>
<a name="line-63"></a> <span class='hs-varid'>workingRepoDir</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>}</span>
<a name="line-64"></a>
<a name="line-65"></a><a name="unrevertCmd"></a><span class='hs-definition'>unrevertCmd</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-66"></a><span class='hs-definition'>unrevertCmd</span> <span class='hs-varid'>opts</span> <span class='hs-conid'>[]</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-keyglyph'>\</span><span class='hs-varid'>repository</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-67"></a> <span class='hs-varid'>us</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>read_repo</span> <span class='hs-varid'>repository</span>
<a name="line-68"></a> <span class='hs-conid'>Sealed</span> <span class='hs-varid'>them</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unrevertPatchBundle</span> <span class='hs-varid'>repository</span>
<a name="line-69"></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-70"></a> <span class='hs-varid'>unrec</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unrecordedChanges</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>repository</span> <span class='hs-conid'>[]</span>
<a name="line-71"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>get_common_and_uncommon</span> <span class='hs-layout'>(</span><span class='hs-varid'>us</span><span class='hs-layout'>,</span> <span class='hs-varid'>them</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-72"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>h_us</span> <span class='hs-conop'>:\/:</span> <span class='hs-varid'>h_them</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-73"></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'>repository</span> <span class='hs-str'>"pull"</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-74"></a> <span class='hs-layout'>(</span><span class='hs-varid'>reverseRL</span> <span class='hs-varid'>h_us</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverseRL</span> <span class='hs-varid'>h_them</span><span class='hs-layout'>)</span>
<a name="line-75"></a> <span class='hs-varid'>with_selected_changes_to_files'</span> <span class='hs-str'>"unrevert"</span> <span class='hs-varid'>opts</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>pw</span> <span class='hs-varop'>$</span>
<a name="line-76"></a> <span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span> <span class='hs-conop'>:></span> <span class='hs-varid'>skipped</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-77"></a> <span class='hs-varid'>tentativelyAddToPending</span> <span class='hs-varid'>repository</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>p</span>
<a name="line-78"></a> <span class='hs-varid'>withSignalsBlocked</span> <span class='hs-varop'>$</span>
<a name="line-79"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>finalizeRepositoryChanges</span> <span class='hs-varid'>repository</span>
<a name="line-80"></a> <span class='hs-varid'>applyToWorking</span> <span class='hs-varid'>repository</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>p</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-81"></a> <span class='hs-varid'>fail</span> <span class='hs-layout'>(</span><span class='hs-str'>"Error applying unrevert to working directory...\n"</span>
<a name="line-82"></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-83"></a> <span class='hs-varid'>debugMessage</span> <span class='hs-str'>"I'm about to writeUnrevert."</span>
<a name="line-84"></a> <span class='hs-varid'>writeUnrevert</span> <span class='hs-varid'>repository</span> <span class='hs-varid'>skipped</span> <span class='hs-varid'>rec</span> <span class='hs-layout'>(</span><span class='hs-varid'>unrec</span><span class='hs-varop'>+>+</span><span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-85"></a> <span class='hs-varid'>debugMessage</span> <span class='hs-str'>"Finished unreverting."</span>
<a name="line-86"></a><span class='hs-definition'>unrevertCmd</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>impossible</span>
<a name="line-87"></a>
<a name="line-88"></a><a name="writeUnrevert"></a><span class='hs-definition'>writeUnrevert</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>RepoPatch</span> <span class='hs-varid'>p</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-conid'>Prim</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-89"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Tree</span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FL</span> <span class='hs-conid'>Prim</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</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-90"></a><span class='hs-definition'>writeUnrevert</span> <span class='hs-varid'>repository</span> <span class='hs-conid'>NilFL</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>removeFileMayNotExist</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unrevertUrl</span> <span class='hs-varid'>repository</span>
<a name="line-91"></a><span class='hs-definition'>writeUnrevert</span> <span class='hs-varid'>repository</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>rec</span> <span class='hs-varid'>pend</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-92"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>commute</span> <span class='hs-layout'>(</span><span class='hs-varid'>pend</span> <span class='hs-conop'>:></span> <span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-93"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>really</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>askUser</span> <span class='hs-str'>"You will not be able to unrevert this operation! Proceed? "</span>
<a name="line-94"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>really</span> <span class='hs-keyword'>of</span> <span class='hs-layout'>(</span><span class='hs-chr'>'y'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-95"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>exitWith</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ExitSuccess</span>
<a name="line-96"></a> <span class='hs-varid'>writeUnrevert</span> <span class='hs-varid'>repository</span> <span class='hs-conid'>NilFL</span> <span class='hs-varid'>rec</span> <span class='hs-varid'>pend</span>
<a name="line-97"></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-keyword'>do</span>
<a name="line-98"></a> <span class='hs-varid'>rep</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>read_repo</span> <span class='hs-varid'>repository</span>
<a name="line-99"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>get_common_and_uncommon</span> <span class='hs-layout'>(</span><span class='hs-varid'>rep</span><span class='hs-layout'>,</span><span class='hs-varid'>rep</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-100"></a> <span class='hs-layout'>(</span><span class='hs-varid'>common</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span> <span class='hs-conop'>:\/:</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-101"></a> <span class='hs-varid'>date</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getIsoDateTime</span>
<a name="line-102"></a> <span class='hs-varid'>np</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>namepatch</span> <span class='hs-varid'>date</span> <span class='hs-str'>"unrevert"</span> <span class='hs-str'>"anon"</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromRepoPrims</span> <span class='hs-varid'>repository</span> <span class='hs-varid'>p'</span><span class='hs-layout'>)</span>
<a name="line-103"></a> <span class='hs-varid'>bundle</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>make_bundle</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Unified</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>rec</span> <span class='hs-varid'>common</span> <span class='hs-layout'>(</span><span class='hs-varid'>np</span> <span class='hs-conop'>:>:</span> <span class='hs-conid'>NilFL</span><span class='hs-layout'>)</span>
<a name="line-104"></a> <span class='hs-varid'>writeDocBinFile</span> <span class='hs-layout'>(</span><span class='hs-varid'>unrevertUrl</span> <span class='hs-varid'>repository</span><span class='hs-layout'>)</span> <span class='hs-varid'>bundle</span>
<a name="line-105"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>fromRepoPrims</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>RepoPatch</span> <span class='hs-varid'>p</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-conid'>Prim</span> <span class='hs-conid'>C</span><span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></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'>y</span><span class='hs-layout'>)</span>
<a name="line-106"></a> <span class='hs-varid'>fromRepoPrims</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromPrims</span> <span class='hs-varid'>xs</span>
<a name="line-107"></a>
<a name="line-108"></a><a name="unrevertPatchBundle"></a><span class='hs-definition'>unrevertPatchBundle</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>RepoPatch</span> <span class='hs-varid'>p</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'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>SealedPatchSet</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-109"></a><span class='hs-definition'>unrevertPatchBundle</span> <span class='hs-varid'>repository</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-110"></a> <span class='hs-varid'>pf</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>readFile</span> <span class='hs-layout'>(</span><span class='hs-varid'>unrevertUrl</span> <span class='hs-varid'>repository</span><span class='hs-layout'>)</span>
<a name="line-111"></a> <span class='hs-varop'>`catchall`</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"There's nothing to unrevert!"</span>
<a name="line-112"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>scan_bundle</span> <span class='hs-varid'>pf</span> <span class='hs-keyword'>of</span>
<a name="line-113"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>ps</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>ps</span>
<a name="line-114"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Couldn't parse unrevert patch:\n"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>err</span>
</pre>\end{code}
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