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<title>src/Darcs/Commands/ShowContents.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-- Copyright (C) 2007 Eric Kow</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'>ShowContents</span> <span class='hs-layout'>(</span> <span class='hs-varid'>showContents</span> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-19"></a>
<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'>Monad</span> <span class='hs-layout'>(</span> <span class='hs-varid'>filterM</span><span class='hs-layout'>,</span> <span class='hs-varid'>forM_</span><span class='hs-layout'>,</span> <span class='hs-varid'>forM</span><span class='hs-layout'>,</span> <span class='hs-varid'>unless</span> <span class='hs-layout'>)</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span> <span class='hs-layout'>(</span> <span class='hs-varid'>stdout</span> <span class='hs-layout'>)</span>
<a name="line-22"></a>
<a name="line-23"></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-24"></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-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>BL</span>
<a name="line-25"></a>
<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'>Arguments</span> <span class='hs-layout'>(</span> <span class='hs-conid'>DarcsFlag</span><span class='hs-layout'>,</span> <span class='hs-varid'>matchOne</span><span class='hs-layout'>,</span>
<a name="line-28"></a> <span class='hs-varid'>workingRepoDir</span><span class='hs-layout'>,</span> <span class='hs-varid'>fixSubPaths</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'>RepoPath</span> <span class='hs-layout'>(</span> <span class='hs-varid'>sp2fn</span><span class='hs-layout'>,</span> <span class='hs-varid'>toFilePath</span> <span class='hs-layout'>)</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>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>
<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'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>ApplyMonad</span> <span class='hs-layout'>(</span> <span class='hs-varid'>withFiles</span> <span class='hs-layout'>)</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Match</span> <span class='hs-layout'>(</span> <span class='hs-varid'>haveNonrangeMatch</span><span class='hs-layout'>,</span> <span class='hs-varid'>applyInvToMatcher</span><span class='hs-layout'>,</span> <span class='hs-varid'>nonrangeMatcher</span>
<a name="line-33"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>InclusiveOrExclusive</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'>matchExists</span><span class='hs-layout'>,</span> <span class='hs-varid'>applyNInv</span>
<a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>hasIndexRange</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'>Repository</span> <span class='hs-layout'>(</span> <span class='hs-varid'>withRepository</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'>findRepository</span><span class='hs-layout'>,</span> <span class='hs-varid'>readRepo</span><span class='hs-layout'>,</span> <span class='hs-varid'>readRecorded</span> <span class='hs-layout'>)</span>
<a name="line-36"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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-keyword'>as</span> <span class='hs-conid'>HSM</span>
<a name="line-37"></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'>AnchoredPath</span><span class='hs-layout'>(</span> <span class='hs-varid'>floatPath</span><span class='hs-layout'>,</span> <span class='hs-varid'>anchorPath</span> <span class='hs-layout'>)</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="showContentsDescription"></a><span class='hs-definition'>showContentsDescription</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-40"></a><span class='hs-definition'>showContentsDescription</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Outputs a specific version of a file."</span>
<a name="line-41"></a>
<a name="line-42"></a><a name="showContentsHelp"></a><span class='hs-definition'>showContentsHelp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-43"></a><span class='hs-definition'>showContentsHelp</span> <span class='hs-keyglyph'>=</span>
<a name="line-44"></a> <span class='hs-str'>"Show contents can be used to display an earlier version of some file(s).\n"</span><span class='hs-varop'>++</span>
<a name="line-45"></a> <span class='hs-str'>"If you give show contents no version arguments, it displays the recorded\n"</span><span class='hs-varop'>++</span>
<a name="line-46"></a> <span class='hs-str'>"version of the file(s).\n"</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="showContents"></a><span class='hs-definition'>showContents</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DarcsCommand</span>
<a name="line-49"></a><span class='hs-definition'>showContents</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-50"></a> <span class='hs-varid'>commandName</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"contents"</span><span class='hs-layout'>,</span>
<a name="line-51"></a> <span class='hs-varid'>commandHelp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showContentsHelp</span><span class='hs-layout'>,</span>
<a name="line-52"></a> <span class='hs-varid'>commandDescription</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showContentsDescription</span><span class='hs-layout'>,</span>
<a name="line-53"></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-54"></a> <span class='hs-varid'>commandExtraArgHelp</span>
<a name="line-55"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-str'>"[FILE]..."</span><span class='hs-keyglyph'>]</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'>showContentsCmd</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'>findRepository</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-conid'>[]</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'>matchOne</span><span class='hs-layout'>,</span> <span class='hs-varid'>workingRepoDir</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>}</span>
<a name="line-62"></a>
<a name="line-63"></a><a name="showContentsCmd"></a><span class='hs-definition'>showContentsCmd</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-64"></a><span class='hs-definition'>showContentsCmd</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"show contents needs at least one argument."</span>
<a name="line-65"></a><span class='hs-definition'>showContentsCmd</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>args</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withRepository</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-66"></a> <span class='hs-varid'>path_list</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>map</span> <span class='hs-varid'>sp2fn</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>fixSubPaths</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>args</span>
<a name="line-67"></a> <span class='hs-varid'>pristine</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readRecorded</span> <span class='hs-varid'>repository</span>
<a name="line-68"></a> <span class='hs-varid'>unapply</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>haveNonrangeMatch</span> <span class='hs-varid'>opts</span>
<a name="line-69"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span>
<a name="line-70"></a> <span class='hs-varid'>patchset</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readRepo</span> <span class='hs-varid'>repository</span>
<a name="line-71"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>nonrangeMatcher</span> <span class='hs-varid'>opts</span> <span class='hs-keyword'>of</span>
<a name="line-72"></a> <span class='hs-comment'>-- Index cannot be a Matcher, so handle it manually.</span>
<a name="line-73"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>hasIndexRange</span> <span class='hs-varid'>opts</span> <span class='hs-keyword'>of</span>
<a name="line-74"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-layout'>,</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>==</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>applyNInv</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>patchset</span>
<a name="line-75"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Couldn't obtain a valid matcher."</span>
<a name="line-76"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-77"></a> <span class='hs-varid'>unless</span> <span class='hs-layout'>(</span><span class='hs-varid'>matchExists</span> <span class='hs-varid'>m</span> <span class='hs-varid'>patchset</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-78"></a> <span class='hs-varid'>fail</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Couldn't match pattern "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>m</span>
<a name="line-79"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>applyInvToMatcher</span> <span class='hs-conid'>Exclusive</span> <span class='hs-varid'>m</span> <span class='hs-varid'>patchset</span>
<a name="line-80"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-81"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>dump</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HSM</span><span class='hs-varop'>.</span><span class='hs-conid'>TreeIO</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>FileName</span><span class='hs-layout'>,</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-82"></a> <span class='hs-varid'>dump</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-83"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>floatedPaths</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>floatPath</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toFilePath</span><span class='hs-layout'>)</span> <span class='hs-varid'>path_list</span>
<a name="line-84"></a> <span class='hs-varid'>okpaths</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>filterM</span> <span class='hs-conid'>HSM</span><span class='hs-varop'>.</span><span class='hs-varid'>fileExists</span> <span class='hs-varid'>floatedPaths</span>
<a name="line-85"></a> <span class='hs-varid'>forM</span> <span class='hs-varid'>okpaths</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>f</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-86"></a> <span class='hs-varid'>content</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>concat</span> <span class='hs-varop'>.</span> <span class='hs-conid'>BL</span><span class='hs-varop'>.</span><span class='hs-varid'>toChunks</span><span class='hs-layout'>)</span> <span class='hs-varop'>`fmap`</span> <span class='hs-conid'>HSM</span><span class='hs-varop'>.</span><span class='hs-varid'>readFile</span> <span class='hs-varid'>f</span>
<a name="line-87"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>fp2fn</span> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-str'>"./"</span> <span class='hs-varop'>++</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>anchorPath</span> <span class='hs-str'>""</span> <span class='hs-varid'>f</span><span class='hs-layout'>,</span> <span class='hs-varid'>content</span><span class='hs-layout'>)</span>
<a name="line-88"></a> <span class='hs-varid'>files</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>flip</span> <span class='hs-varid'>withFiles</span> <span class='hs-varid'>unapply</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>fst</span>
<a name="line-89"></a> <span class='hs-varop'>`fmap`</span> <span class='hs-conid'>HSM</span><span class='hs-varop'>.</span><span class='hs-varid'>virtualTreeIO</span> <span class='hs-varid'>dump</span> <span class='hs-varid'>pristine</span>
<a name="line-90"></a> <span class='hs-varid'>forM_</span> <span class='hs-varid'>files</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-keyword'>_</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-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>hPut</span> <span class='hs-varid'>stdout</span> <span class='hs-varid'>f</span>
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