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<pre><a name="line-1"></a><span class='hs-comment'>-- Copyright (C) 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'>{-# OPTIONS_GHC -cpp #-}</span>
<a name="line-20"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>FilePathMonad</span> <span class='hs-layout'>(</span> <span class='hs-conid'>FilePathMonad</span><span class='hs-layout'>,</span> <span class='hs-varid'>withFilePaths</span> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-23"></a>
<a name="line-24"></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-conid'>MonadPlus</span><span class='hs-layout'>,</span> <span class='hs-varid'>mplus</span><span class='hs-layout'>,</span> <span class='hs-varid'>mzero</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'>Maybe</span> <span class='hs-layout'>(</span> <span class='hs-varid'>catMaybes</span> <span class='hs-layout'>)</span>
<a name="line-26"></a>
<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'>IO</span> <span class='hs-layout'>(</span> <span class='hs-conid'>ReadableDirectory</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'>WriteableDirectory</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</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'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>FileName</span> <span class='hs-layout'>(</span> <span class='hs-conid'>FileName</span><span class='hs-layout'>,</span> <span class='hs-varid'>fp2fn</span><span class='hs-layout'>,</span> <span class='hs-varid'>fn2fp</span><span class='hs-layout'>,</span> <span class='hs-varid'>superName</span><span class='hs-layout'>,</span> <span class='hs-varid'>break_on_dir</span><span class='hs-layout'>,</span>
<a name="line-29"></a> <span class='hs-varid'>norm_path</span><span class='hs-layout'>,</span> <span class='hs-varid'>movedirfilename</span> <span class='hs-layout'>)</span>
<a name="line-30"></a><span class='hs-cpp'>#include "impossible.h"</span>
<a name="line-31"></a>
<a name="line-32"></a><a name="FilePathMonad"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>FilePathMonad</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FPM</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>FileName</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>FileName</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-33"></a>
<a name="line-34"></a><a name="withFilePaths"></a><span class='hs-definition'>withFilePaths</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>FilePath</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FilePathMonad</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>FilePath</span><span class='hs-keyglyph'>]</span>
<a name="line-35"></a><span class='hs-definition'>withFilePaths</span> <span class='hs-varid'>fps</span> <span class='hs-layout'>(</span><span class='hs-conid'>FPM</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fn2fp</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fst</span> <span class='hs-varop'>$</span> <span class='hs-varid'>x</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fp2fn</span> <span class='hs-varid'>fps</span>
<a name="line-36"></a>
<a name="line-37"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-conid'>FilePathMonad</span> <span class='hs-keyword'>where</span>
<a name="line-38"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>m</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span>
<a name="line-39"></a>
<a name="line-40"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-conid'>FilePathMonad</span> <span class='hs-keyword'>where</span>
<a name="line-41"></a> <span class='hs-layout'>(</span><span class='hs-conid'>FPM</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FPM</span> <span class='hs-varid'>z</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>z</span> <span class='hs-varid'>fs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-varid'>fs</span> <span class='hs-keyword'>of</span>
<a name="line-42"></a> <span class='hs-layout'>(</span><span class='hs-varid'>fs'</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>y</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>of</span>
<a name="line-43"></a> <span class='hs-conid'>FPM</span> <span class='hs-varid'>yf</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>yf</span> <span class='hs-varid'>fs'</span>
<a name="line-44"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FPM</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>fs</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>fs</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-45"></a>
<a name="line-46"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadPlus</span> <span class='hs-conid'>FilePathMonad</span> <span class='hs-keyword'>where</span>
<a name="line-47"></a> <span class='hs-varid'>mzero</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"mzero FilePathMonad"</span> <span class='hs-comment'>-- yuck!</span>
<a name="line-48"></a> <span class='hs-varid'>a</span> <span class='hs-varop'>`mplus`</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-49"></a>
<a name="line-50"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ReadableDirectory</span> <span class='hs-conid'>FilePathMonad</span> <span class='hs-keyword'>where</span>
<a name="line-51"></a> <span class='hs-comment'>-- We can't check it actually is a directory here</span>
<a name="line-52"></a> <span class='hs-varid'>mDoesDirectoryExist</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span>
<a name="line-53"></a> <span class='hs-conid'>FPM</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>fs</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>fs</span><span class='hs-layout'>,</span> <span class='hs-varid'>norm_path</span> <span class='hs-varid'>d</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>map</span> <span class='hs-varid'>norm_path</span> <span class='hs-varid'>fs</span><span class='hs-layout'>)</span>
<a name="line-54"></a> <span class='hs-comment'>-- We can't check it actually is a file here</span>
<a name="line-55"></a> <span class='hs-varid'>mDoesFileExist</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span>
<a name="line-56"></a> <span class='hs-conid'>FPM</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>fs</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>fs</span><span class='hs-layout'>,</span> <span class='hs-varid'>norm_path</span> <span class='hs-varid'>f</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>map</span> <span class='hs-varid'>norm_path</span> <span class='hs-varid'>fs</span><span class='hs-layout'>)</span>
<a name="line-57"></a> <span class='hs-varid'>mInCurrentDirectory</span> <span class='hs-varid'>d</span> <span class='hs-layout'>(</span><span class='hs-conid'>FPM</span> <span class='hs-varid'>j</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-58"></a> <span class='hs-conid'>FPM</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>fs</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>fs</span><span class='hs-layout'>,</span> <span class='hs-varid'>snd</span> <span class='hs-varop'>$</span> <span class='hs-varid'>j</span> <span class='hs-varop'>$</span> <span class='hs-varid'>catMaybes</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>indir</span> <span class='hs-varid'>fs</span><span class='hs-layout'>)</span>
<a name="line-59"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>indir</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>d'</span><span class='hs-layout'>,</span><span class='hs-varid'>f'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>break_on_dir</span> <span class='hs-varid'>f</span>
<a name="line-60"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>d</span> <span class='hs-varop'>==</span> <span class='hs-varid'>d'</span> <span class='hs-keyword'>then</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>f'</span>
<a name="line-61"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Nothing</span>
<a name="line-62"></a> <span class='hs-varid'>mGetDirectoryContents</span> <span class='hs-keyglyph'>=</span>
<a name="line-63"></a> <span class='hs-conid'>FPM</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>fs</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>fs</span><span class='hs-layout'>,</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>f</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fp2fn</span> <span class='hs-str'>"."</span> <span class='hs-varop'>==</span> <span class='hs-varid'>superName</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>fs</span><span class='hs-layout'>)</span>
<a name="line-64"></a> <span class='hs-varid'>mReadFilePS</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bug</span> <span class='hs-str'>"can't mReadFilePS in FilePathMonad!"</span>
<a name="line-65"></a>
<a name="line-66"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>WriteableDirectory</span> <span class='hs-conid'>FilePathMonad</span> <span class='hs-keyword'>where</span>
<a name="line-67"></a> <span class='hs-varid'>mWithCurrentDirectory</span> <span class='hs-varid'>d</span> <span class='hs-layout'>(</span><span class='hs-conid'>FPM</span> <span class='hs-varid'>j</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-68"></a> <span class='hs-conid'>FPM</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>fs</span> <span class='hs-keyglyph'>-></span>
<a name="line-69"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>splitfs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>splitf</span> <span class='hs-varid'>fs</span>
<a name="line-70"></a> <span class='hs-varid'>others</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>catMaybes</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>snd</span> <span class='hs-varid'>splitfs</span>
<a name="line-71"></a> <span class='hs-layout'>(</span><span class='hs-varid'>myfs</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>j</span> <span class='hs-varop'>$</span> <span class='hs-varid'>catMaybes</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>splitfs</span>
<a name="line-72"></a> <span class='hs-varid'>splitf</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>break_on_dir</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>of</span>
<a name="line-73"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>d'</span><span class='hs-layout'>,</span> <span class='hs-varid'>f'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>d'</span> <span class='hs-varop'>==</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>f'</span><span class='hs-layout'>,</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-74"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-75"></a> <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-varid'>others</span> <span class='hs-varop'>++</span> <span class='hs-varid'>myfs</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-76"></a> <span class='hs-varid'>mSetFileExecutable</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-77"></a> <span class='hs-varid'>mWriteFilePS</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-78"></a> <span class='hs-varid'>mCreateDirectory</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-79"></a> <span class='hs-varid'>mRemoveFile</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FPM</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>fs</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>fs</span><span class='hs-layout'>,</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-80"></a> <span class='hs-varid'>mRemoveDirectory</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FPM</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>fs</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>fs</span><span class='hs-layout'>,</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-81"></a> <span class='hs-varid'>mRename</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FPM</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>fs</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>movedirfilename</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-varid'>fs</span><span class='hs-layout'>,</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-82"></a> <span class='hs-varid'>mModifyFilePS</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-83"></a> <span class='hs-varid'>mModifyFilePSs</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
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