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<title>src/Darcs/Patch/Apply.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>
<a name="line-19"></a><span class='hs-comment'>{-# LANGUAGE CPP, MultiParamTypeClasses #-}</span>
<a name="line-20"></a>
<a name="line-21"></a><span class='hs-cpp'>#include "gadts.h"</span>
<a name="line-22"></a>
<a name="line-23"></a><span class='hs-comment'>-- |</span>
<a name="line-24"></a><span class='hs-comment'>-- Module : Darcs.Patch.Apply</span>
<a name="line-25"></a><span class='hs-comment'>-- Copyright : 2002-2005 David Roundy</span>
<a name="line-26"></a><span class='hs-comment'>-- License : GPL</span>
<a name="line-27"></a><span class='hs-comment'>-- Maintainer : darcs-devel@darcs.net</span>
<a name="line-28"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-29"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-30"></a>
<a name="line-31"></a><span class='hs-keyword'>module</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>
<a name="line-32"></a> <span class='hs-layout'>(</span>
<a name="line-33"></a> <span class='hs-conid'>Apply</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>applyToFilePaths</span>
<a name="line-35"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>applyToTree</span>
<a name="line-36"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>applyToState</span>
<a name="line-37"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>effectOnFilePaths</span>
<a name="line-38"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-39"></a>
<a name="line-40"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span> <span class='hs-varid'>catch</span><span class='hs-layout'>,</span> <span class='hs-varid'>pi</span> <span class='hs-layout'>)</span>
<a name="line-41"></a>
<a name="line-42"></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-43"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Arrow</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-44"></a>
<a name="line-45"></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-46"></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'>Monad</span><span class='hs-layout'>(</span> <span class='hs-varid'>virtualTreeMonad</span> <span class='hs-layout'>)</span>
<a name="line-47"></a>
<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'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>ApplyMonad</span> <span class='hs-layout'>(</span> <span class='hs-conid'>ApplyMonad</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'>withFileNames</span><span class='hs-layout'>,</span> <span class='hs-conid'>ApplyMonadTrans</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><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'>FileName</span><span class='hs-layout'>(</span> <span class='hs-varid'>fn2fp</span><span class='hs-layout'>,</span> <span class='hs-varid'>fp2fn</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'>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-conid'>RL</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-51"></a>
<a name="line-52"></a>
<a name="line-53"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Apply</span> <span class='hs-varid'>p</span> <span class='hs-keyword'>where</span>
<a name="line-54"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>ApplyState</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varop'>*</span> <span class='hs-keyglyph'>-></span> <span class='hs-varop'>*</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varop'>*</span>
<a name="line-55"></a> <span class='hs-varid'>apply</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ApplyMonad</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>ApplyState</span> <span class='hs-varid'>p</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'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-56"></a>
<a name="line-57"></a><a name="instance%20Apply%20(FL%20p)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Apply</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Apply</span> <span class='hs-layout'>(</span><span class='hs-conid'>FL</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-58"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>ApplyState</span> <span class='hs-layout'>(</span><span class='hs-conid'>FL</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ApplyState</span> <span class='hs-varid'>p</span>
<a name="line-59"></a> <span class='hs-varid'>apply</span> <span class='hs-conid'>NilFL</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-60"></a> <span class='hs-varid'>apply</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</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'>apply</span> <span class='hs-varid'>p</span> <span class='hs-varop'>>></span> <span class='hs-varid'>apply</span> <span class='hs-varid'>ps</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="instance%20Apply%20(RL%20p)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Apply</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Apply</span> <span class='hs-layout'>(</span><span class='hs-conid'>RL</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-63"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>ApplyState</span> <span class='hs-layout'>(</span><span class='hs-conid'>RL</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ApplyState</span> <span class='hs-varid'>p</span>
<a name="line-64"></a> <span class='hs-varid'>apply</span> <span class='hs-conid'>NilRL</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-65"></a> <span class='hs-varid'>apply</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</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'>apply</span> <span class='hs-varid'>ps</span> <span class='hs-varop'>>></span> <span class='hs-varid'>apply</span> <span class='hs-varid'>p</span>
<a name="line-66"></a>
<a name="line-67"></a>
<a name="line-68"></a><a name="effectOnFilePaths"></a><span class='hs-definition'>effectOnFilePaths</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Apply</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>
<a name="line-69"></a> <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'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-70"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>FilePath</span><span class='hs-keyglyph'>]</span>
<a name="line-71"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>FilePath</span><span class='hs-keyglyph'>]</span>
<a name="line-72"></a><span class='hs-definition'>effectOnFilePaths</span> <span class='hs-varid'>p</span> <span class='hs-varid'>fps</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fps'</span> <span class='hs-keyword'>where</span>
<a name="line-73"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>fps'</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>applyToFilePaths</span> <span class='hs-varid'>p</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>fps</span>
<a name="line-74"></a>
<a name="line-75"></a>
<a name="line-76"></a><a name="applyToFilePaths"></a><span class='hs-definition'>applyToFilePaths</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Apply</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>
<a name="line-77"></a> <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'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-78"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>FilePath</span><span class='hs-layout'>,</span> <span class='hs-conid'>FilePath</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-79"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>FilePath</span><span class='hs-keyglyph'>]</span>
<a name="line-80"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>FilePath</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>FilePath</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>FilePath</span><span class='hs-layout'>,</span> <span class='hs-conid'>FilePath</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-81"></a><span class='hs-definition'>applyToFilePaths</span> <span class='hs-varid'>pa</span> <span class='hs-varid'>ofpos</span> <span class='hs-varid'>fs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toFPs</span> <span class='hs-varop'>$</span> <span class='hs-varid'>withFileNames</span> <span class='hs-varid'>ofnos</span> <span class='hs-varid'>fns</span> <span class='hs-layout'>(</span><span class='hs-varid'>apply</span> <span class='hs-varid'>pa</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-82"></a> <span class='hs-varid'>fns</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fp2fn</span> <span class='hs-varid'>fs</span>
<a name="line-83"></a> <span class='hs-varid'>ofnos</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>fp2fn</span> <span class='hs-varop'>***</span> <span class='hs-varid'>fp2fn</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>ofpos</span>
<a name="line-84"></a> <span class='hs-varid'>toFPs</span> <span class='hs-layout'>(</span><span class='hs-varid'>affected</span><span class='hs-layout'>,</span> <span class='hs-varid'>new</span><span class='hs-layout'>,</span> <span class='hs-varid'>renames</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-85"></a> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>fn2fp</span> <span class='hs-varid'>affected</span><span class='hs-layout'>,</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fn2fp</span> <span class='hs-varid'>new</span><span class='hs-layout'>,</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>fn2fp</span> <span class='hs-varop'>***</span> <span class='hs-varid'>fn2fp</span><span class='hs-layout'>)</span> <span class='hs-varid'>renames</span><span class='hs-layout'>)</span>
<a name="line-86"></a>
<a name="line-87"></a>
<a name="line-88"></a><a name="applyToTree"></a><span class='hs-comment'>-- | Apply a patch to a 'Tree', yielding a new 'Tree'.</span>
<a name="line-89"></a><span class='hs-definition'>applyToTree</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Apply</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>Functor</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</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>
<a name="line-90"></a> <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'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-91"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Tree</span> <span class='hs-varid'>m</span>
<a name="line-92"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Tree</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-93"></a><span class='hs-definition'>applyToTree</span> <span class='hs-varid'>patch</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>snd</span> <span class='hs-varop'><$></span> <span class='hs-varid'>virtualTreeMonad</span> <span class='hs-layout'>(</span><span class='hs-varid'>apply</span> <span class='hs-varid'>patch</span><span class='hs-layout'>)</span> <span class='hs-varid'>t</span>
<a name="line-94"></a>
<a name="line-95"></a>
<a name="line-96"></a><a name="applyToState"></a><span class='hs-definition'>applyToState</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>p</span> <span class='hs-varid'>m</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><span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conid'>Apply</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>ApplyMonadTrans</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>ApplyState</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-97"></a> <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'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-98"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>ApplyState</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span>
<a name="line-99"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-conid'>ApplyState</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-100"></a><span class='hs-definition'>applyToState</span> <span class='hs-varid'>patch</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>snd</span> <span class='hs-varop'><$></span> <span class='hs-varid'>runApplyMonad</span> <span class='hs-layout'>(</span><span class='hs-varid'>apply</span> <span class='hs-varid'>patch</span><span class='hs-layout'>)</span> <span class='hs-varid'>t</span>
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