<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<!-- Generated by HsColour, http://code.haskell.org/~malcolm/hscolour/ -->
<title>src/Darcs/Commands/Replace.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<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-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-19"></a>
<a name="line-20"></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'>Replace</span> <span class='hs-layout'>(</span> <span class='hs-varid'>replace</span><span class='hs-layout'>,</span> <span class='hs-varid'>defaultToks</span> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-21"></a>
<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'>Maybe</span> <span class='hs-layout'>(</span> <span class='hs-varid'>isJust</span> <span class='hs-layout'>)</span>
<a name="line-23"></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'>unless</span><span class='hs-layout'>,</span> <span class='hs-varid'>filterM</span> <span class='hs-layout'>)</span>
<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'>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-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>
<a name="line-27"></a> <span class='hs-varid'>nodefaults</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'>ForceReplace</span><span class='hs-layout'>,</span> <span class='hs-conid'>Toks</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>listRegisteredFiles</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'>umaskOption</span><span class='hs-layout'>,</span> <span class='hs-varid'>tokens</span><span class='hs-layout'>,</span> <span class='hs-varid'>forceReplace</span><span class='hs-layout'>,</span>
<a name="line-30"></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-31"></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>
<a name="line-32"></a> <span class='hs-varid'>addToPending</span><span class='hs-layout'>,</span>
<a name="line-33"></a> <span class='hs-varid'>amInHashedRepository</span><span class='hs-layout'>,</span>
<a name="line-34"></a> <span class='hs-varid'>applyToWorking</span><span class='hs-layout'>,</span>
<a name="line-35"></a> <span class='hs-varid'>readUnrecorded</span><span class='hs-layout'>,</span> <span class='hs-varid'>readRecordedAndPending</span>
<a name="line-36"></a> <span class='hs-layout'>)</span>
<a name="line-37"></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'>Patchy</span><span class='hs-layout'>,</span> <span class='hs-conid'>PrimPatch</span><span class='hs-layout'>,</span> <span class='hs-varid'>tokreplace</span><span class='hs-layout'>,</span> <span class='hs-varid'>forceTokReplace</span><span class='hs-layout'>,</span> <span class='hs-varid'>applyToTree</span> <span class='hs-layout'>)</span>
<a name="line-38"></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'>Apply</span><span class='hs-layout'>(</span> <span class='hs-conid'>ApplyState</span> <span class='hs-layout'>)</span>
<a name="line-39"></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>
<a name="line-40"></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'>Patchy</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Apply</span> <span class='hs-layout'>)</span>
<a name="line-41"></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-varop'>+>+</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>concatFL</span><span class='hs-layout'>,</span> <span class='hs-varid'>toFL</span> <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'>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> <span class='hs-varid'>mapSeal</span><span class='hs-layout'>,</span> <span class='hs-conid'>FreeLeft</span><span class='hs-layout'>,</span> <span class='hs-conid'>Gap</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</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'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>RegChars</span> <span class='hs-layout'>(</span> <span class='hs-varid'>regChars</span> <span class='hs-layout'>)</span>
<a name="line-44"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span> <span class='hs-layout'>(</span> <span class='hs-varid'>isSpace</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'>RepoPath</span> <span class='hs-layout'>(</span> <span class='hs-conid'>SubPath</span><span class='hs-layout'>,</span> <span class='hs-varid'>toFilePath</span><span class='hs-layout'>,</span> <span class='hs-varid'>sp2fn</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'>Repository</span><span class='hs-varop'>.</span><span class='hs-conid'>Prefs</span> <span class='hs-layout'>(</span> <span class='hs-conid'>FileType</span><span class='hs-layout'>(</span><span class='hs-conid'>TextFile</span><span class='hs-layout'>)</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'>Diff</span><span class='hs-layout'>(</span> <span class='hs-varid'>treeDiff</span> <span class='hs-layout'>)</span>
<a name="line-48"></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-varid'>readBlob</span><span class='hs-layout'>,</span> <span class='hs-varid'>modifyTree</span> <span class='hs-layout'>,</span> <span class='hs-varid'>findFile</span><span class='hs-layout'>,</span> <span class='hs-conid'>TreeItem</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'>Tree</span><span class='hs-layout'>,</span> <span class='hs-varid'>makeBlobBS</span> <span class='hs-layout'>)</span>
<a name="line-49"></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-conid'>AnchoredPath</span><span class='hs-layout'>,</span> <span class='hs-varid'>floatPath</span> <span class='hs-layout'>)</span>
<a name="line-50"></a>
<a name="line-51"></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-52"></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'>BS</span>
<a name="line-53"></a><span class='hs-cpp'>#include "impossible.h"</span>
<a name="line-54"></a><span class='hs-cpp'>#include "gadts.h"</span>
<a name="line-55"></a>
<a name="line-56"></a><a name="replaceDescription"></a><span class='hs-definition'>replaceDescription</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-57"></a><span class='hs-definition'>replaceDescription</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Substitute one word for another."</span>
<a name="line-58"></a>
<a name="line-59"></a><a name="replaceHelp"></a><span class='hs-definition'>replaceHelp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-60"></a><span class='hs-definition'>replaceHelp</span> <span class='hs-keyglyph'>=</span>
<a name="line-61"></a> <span class='hs-str'>"In addition to line-based patches, Darcs supports a limited form of\n"</span> <span class='hs-varop'>++</span>
<a name="line-62"></a> <span class='hs-str'>"lexical substitution. Files are treated as sequences of words, and\n"</span> <span class='hs-varop'>++</span>
<a name="line-63"></a> <span class='hs-str'>"each occurrence of the old word is replaced by the new word.\n"</span> <span class='hs-varop'>++</span>
<a name="line-64"></a> <span class='hs-str'>"This is intended to provide a clean way to rename a function or\n"</span> <span class='hs-varop'>++</span>
<a name="line-65"></a> <span class='hs-str'>"variable. Such renamings typically affect lines all through the\n"</span> <span class='hs-varop'>++</span>
<a name="line-66"></a> <span class='hs-str'>"source code, so a traditional line-based patch would be very likely to\n"</span> <span class='hs-varop'>++</span>
<a name="line-67"></a> <span class='hs-str'>"conflict with other branches, requiring manual merging.\n"</span> <span class='hs-varop'>++</span>
<a name="line-68"></a> <span class='hs-str'>"\n"</span> <span class='hs-varop'>++</span>
<a name="line-69"></a> <span class='hs-str'>"Files are tokenized according to one simple rule: words are strings of\n"</span> <span class='hs-varop'>++</span>
<a name="line-70"></a> <span class='hs-str'>"valid token characters, and everything between them (punctuation and\n"</span> <span class='hs-varop'>++</span>
<a name="line-71"></a> <span class='hs-comment'>-- FIXME: this heuristic is ham-fisted and silly. Can we drop it?</span>
<a name="line-72"></a> <span class='hs-str'>"whitespace) is discarded. By default, valid token characters are\n"</span> <span class='hs-varop'>++</span>
<a name="line-73"></a> <span class='hs-str'>"letters, numbers and the underscore (i.e. [A-Za-z0-9_]). However if\n"</span> <span class='hs-varop'>++</span>
<a name="line-74"></a> <span class='hs-str'>"the old and/or new token contains either a hyphen or period, BOTH\n"</span> <span class='hs-varop'>++</span>
<a name="line-75"></a> <span class='hs-str'>"hyphen and period are treated as valid (i.e. [A-Za-z0-9_.-]).\n"</span> <span class='hs-varop'>++</span>
<a name="line-76"></a> <span class='hs-str'>"\n"</span> <span class='hs-varop'>++</span>
<a name="line-77"></a> <span class='hs-str'>"The set of valid characters can be customized using the --token-chars\n"</span> <span class='hs-varop'>++</span>
<a name="line-78"></a> <span class='hs-str'>"option. The argument must be surrounded by square brackets. If a\n"</span> <span class='hs-varop'>++</span>
<a name="line-79"></a> <span class='hs-str'>"hyphen occurs between two characters in the set, it is treated as a\n"</span> <span class='hs-varop'>++</span>
<a name="line-80"></a> <span class='hs-str'>"set range. For example, in most locales [A-Z] denotes all uppercase\n"</span> <span class='hs-varop'>++</span>
<a name="line-81"></a> <span class='hs-str'>"letters. If the first character is a caret, valid tokens are taken to\n"</span> <span class='hs-varop'>++</span>
<a name="line-82"></a> <span class='hs-str'>"be the complement of the remaining characters. For example, [^:\\n]\n"</span> <span class='hs-varop'>++</span>
<a name="line-83"></a> <span class='hs-str'>"could be used to match fields in the passwd(5), where records and\n"</span> <span class='hs-varop'>++</span>
<a name="line-84"></a> <span class='hs-str'>"fields are separated by newlines and colons respectively.\n"</span> <span class='hs-varop'>++</span>
<a name="line-85"></a> <span class='hs-str'>"\n"</span> <span class='hs-varop'>++</span>
<a name="line-86"></a> <span class='hs-str'>"If you choose to use --token-chars, you are STRONGLY encouraged to do\n"</span> <span class='hs-varop'>++</span>
<a name="line-87"></a> <span class='hs-str'>"so consistently. The consequences of using multiple replace patches\n"</span> <span class='hs-varop'>++</span>
<a name="line-88"></a> <span class='hs-str'>"with different --token-chars arguments on the same file are not well\n"</span> <span class='hs-varop'>++</span>
<a name="line-89"></a> <span class='hs-str'>"tested nor well understood.\n"</span> <span class='hs-varop'>++</span>
<a name="line-90"></a> <span class='hs-str'>"\n"</span> <span class='hs-varop'>++</span>
<a name="line-91"></a> <span class='hs-str'>"By default Darcs will refuse to perform a replacement if the new token\n"</span> <span class='hs-varop'>++</span>
<a name="line-92"></a> <span class='hs-str'>"is already in use, because the replacements would be not be\n"</span> <span class='hs-varop'>++</span>
<a name="line-93"></a> <span class='hs-str'>"distinguishable from the existing tokens. This behaviour can be\n"</span> <span class='hs-varop'>++</span>
<a name="line-94"></a> <span class='hs-str'>"overridden by supplying the --force option, but an attempt to `darcs\n"</span> <span class='hs-varop'>++</span>
<a name="line-95"></a> <span class='hs-str'>"rollback' the resulting patch will affect these existing tokens.\n"</span> <span class='hs-varop'>++</span>
<a name="line-96"></a> <span class='hs-str'>"\n"</span> <span class='hs-varop'>++</span>
<a name="line-97"></a> <span class='hs-str'>"Limitations:\n"</span> <span class='hs-varop'>++</span>
<a name="line-98"></a> <span class='hs-str'>"\n"</span> <span class='hs-varop'>++</span>
<a name="line-99"></a> <span class='hs-str'>"The tokenizer treats files as byte strings, so it is not possible for\n"</span> <span class='hs-varop'>++</span>
<a name="line-100"></a> <span class='hs-str'>"--token-chars to include multi-byte characters, such as the non-ASCII\n"</span> <span class='hs-varop'>++</span>
<a name="line-101"></a> <span class='hs-str'>"parts of UTF-8. Similarly, trying to replace a `high-bit' character\n"</span> <span class='hs-varop'>++</span>
<a name="line-102"></a> <span class='hs-str'>"from a unibyte encoding will also result in replacement of the same\n"</span> <span class='hs-varop'>++</span>
<a name="line-103"></a> <span class='hs-str'>"byte in files with different encodings. For example, an acute a from\n"</span> <span class='hs-varop'>++</span>
<a name="line-104"></a> <span class='hs-str'>"ISO 8859-1 will also match an alpha from ISO 8859-7.\n"</span> <span class='hs-varop'>++</span>
<a name="line-105"></a> <span class='hs-str'>"\n"</span> <span class='hs-varop'>++</span>
<a name="line-106"></a> <span class='hs-str'>"Due to limitations in the patch file format, --token-chars arguments\n"</span> <span class='hs-varop'>++</span>
<a name="line-107"></a> <span class='hs-str'>"cannot contain literal whitespace. For example, [^ \\n\\t] cannot be\n"</span> <span class='hs-varop'>++</span>
<a name="line-108"></a> <span class='hs-str'>"used to declare all characters except the space, tab and newline as\n"</span> <span class='hs-varop'>++</span>
<a name="line-109"></a> <span class='hs-str'>"valid within a word, because it contains a literal space.\n"</span> <span class='hs-varop'>++</span>
<a name="line-110"></a> <span class='hs-str'>"\n"</span> <span class='hs-varop'>++</span>
<a name="line-111"></a> <span class='hs-str'>"Unlike POSIX regex(7) bracket expressions, character classes (such as\n"</span> <span class='hs-varop'>++</span>
<a name="line-112"></a> <span class='hs-str'>"[[:alnum:]]) are NOT supported by --token-chars, and will be silently\n"</span> <span class='hs-varop'>++</span>
<a name="line-113"></a> <span class='hs-str'>"treated as a simple set of characters.\n"</span>
<a name="line-114"></a>
<a name="line-115"></a><a name="replace"></a><span class='hs-definition'>replace</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DarcsCommand</span>
<a name="line-116"></a><span class='hs-definition'>replace</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-117"></a> <span class='hs-varid'>commandName</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"replace"</span><span class='hs-layout'>,</span>
<a name="line-118"></a> <span class='hs-varid'>commandHelp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>replaceHelp</span><span class='hs-layout'>,</span>
<a name="line-119"></a> <span class='hs-varid'>commandDescription</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>replaceDescription</span><span class='hs-layout'>,</span>
<a name="line-120"></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-121"></a> <span class='hs-varid'>commandExtraArgHelp</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-str'>"<OLD>"</span><span class='hs-layout'>,</span><span class='hs-str'>"<NEW>"</span><span class='hs-layout'>,</span>
<a name="line-122"></a> <span class='hs-str'>"<FILE> ..."</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span>
<a name="line-123"></a> <span class='hs-varid'>commandCommand</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>replaceCmd</span><span class='hs-layout'>,</span>
<a name="line-124"></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-125"></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-126"></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-127"></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-128"></a> <span class='hs-varid'>commandBasicOptions</span> <span class='hs-keyglyph'>=</span>
<a name="line-129"></a> <span class='hs-keyglyph'>[</span><span class='hs-varid'>tokens</span><span class='hs-layout'>,</span> <span class='hs-varid'>forceReplace</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-130"></a>
<a name="line-131"></a><a name="replaceCmd"></a><span class='hs-definition'>replaceCmd</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-132"></a><span class='hs-definition'>replaceCmd</span> <span class='hs-varid'>opts</span> <span class='hs-layout'>(</span><span class='hs-varid'>old</span><span class='hs-conop'>:</span><span class='hs-varid'>new</span><span class='hs-conop'>:</span><span class='hs-varid'>relfs</span><span class='hs-layout'>)</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'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>repository</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-133"></a> <span class='hs-varid'>fs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fixSubPaths</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>relfs</span>
<a name="line-134"></a> <span class='hs-varid'>toks</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>chooseToks</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>old</span> <span class='hs-varid'>new</span>
<a name="line-135"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>checkToken</span> <span class='hs-varid'>tok</span> <span class='hs-keyglyph'>=</span>
<a name="line-136"></a> <span class='hs-varid'>unless</span> <span class='hs-layout'>(</span><span class='hs-varid'>isTok</span> <span class='hs-varid'>toks</span> <span class='hs-varid'>tok</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fail</span> <span class='hs-varop'>$</span> <span class='hs-str'>"'"</span><span class='hs-varop'>++</span><span class='hs-varid'>tok</span><span class='hs-varop'>++</span><span class='hs-str'>"' is not a valid token!"</span>
<a name="line-137"></a> <span class='hs-varid'>checkToken</span> <span class='hs-varid'>old</span>
<a name="line-138"></a> <span class='hs-varid'>checkToken</span> <span class='hs-varid'>new</span>
<a name="line-139"></a> <span class='hs-varid'>work</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readUnrecorded</span> <span class='hs-varid'>repository</span> <span class='hs-conid'>Nothing</span>
<a name="line-140"></a> <span class='hs-varid'>cur</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readRecordedAndPending</span> <span class='hs-varid'>repository</span>
<a name="line-141"></a> <span class='hs-varid'>files</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>filterM</span> <span class='hs-layout'>(</span><span class='hs-varid'>exists</span> <span class='hs-varid'>work</span><span class='hs-layout'>)</span> <span class='hs-varid'>fs</span>
<a name="line-142"></a> <span class='hs-conid'>Sealed</span> <span class='hs-varid'>pswork</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapSeal</span> <span class='hs-varid'>concatFL</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toFL</span> <span class='hs-varop'><$></span> <span class='hs-varid'>mapM</span> <span class='hs-layout'>(</span><span class='hs-varid'>repl</span> <span class='hs-varid'>toks</span> <span class='hs-varid'>cur</span> <span class='hs-varid'>work</span><span class='hs-layout'>)</span> <span class='hs-varid'>files</span>
<a name="line-143"></a> <span class='hs-varid'>addToPending</span> <span class='hs-varid'>repository</span> <span class='hs-varid'>pswork</span>
<a name="line-144"></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-varid'>pswork</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-145"></a> <span class='hs-varid'>fail</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Can't do replace on working!\n"</span>
<a name="line-146"></a> <span class='hs-varop'>++</span> <span class='hs-str'>"Perhaps one of the files already contains '"</span><span class='hs-varop'>++</span> <span class='hs-varid'>new</span><span class='hs-varop'>++</span><span class='hs-str'>"'?\n"</span>
<a name="line-147"></a> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>e</span>
<a name="line-148"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-149"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>ftf</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TextFile</span>
<a name="line-150"></a> <span class='hs-varid'>skipmsg</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Skipping file '"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>toFilePath</span> <span class='hs-varid'>f</span> <span class='hs-varop'>++</span> <span class='hs-str'>"' which isn't in the repository."</span>
<a name="line-151"></a> <span class='hs-varid'>exists</span> <span class='hs-varid'>tree</span> <span class='hs-varid'>file</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>isJust</span> <span class='hs-varop'>$</span> <span class='hs-varid'>findFile</span> <span class='hs-varid'>tree</span> <span class='hs-layout'>(</span><span class='hs-varid'>floatSubPath</span> <span class='hs-varid'>file</span><span class='hs-layout'>)</span>
<a name="line-152"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
<a name="line-153"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>putStrLn</span> <span class='hs-varop'>$</span> <span class='hs-varid'>skipmsg</span> <span class='hs-varid'>file</span>
<a name="line-154"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span>
<a name="line-155"></a> <span class='hs-varid'>repl</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>prim</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conid'>Patchy</span> <span class='hs-varid'>prim</span><span class='hs-layout'>,</span> <span class='hs-conid'>PrimPatch</span> <span class='hs-varid'>prim</span><span class='hs-layout'>,</span> <span class='hs-conid'>ApplyState</span> <span class='hs-varid'>prim</span> <span class='hs-keyglyph'>~</span> <span class='hs-conid'>Tree</span><span class='hs-layout'>)</span>
<a name="line-156"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>String</span> <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'>Tree</span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SubPath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>FreeLeft</span> <span class='hs-layout'>(</span><span class='hs-conid'>FL</span> <span class='hs-varid'>prim</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-157"></a> <span class='hs-varid'>repl</span> <span class='hs-varid'>toks</span> <span class='hs-varid'>cur</span> <span class='hs-varid'>work</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span>
<a name="line-158"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>work_replaced</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>maybeApplyToTree</span> <span class='hs-varid'>replace_patch</span> <span class='hs-varid'>work</span>
<a name="line-159"></a> <span class='hs-varid'>cur_replaced</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>maybeApplyToTree</span> <span class='hs-varid'>replace_patch</span> <span class='hs-varid'>cur</span>
<a name="line-160"></a> <span class='hs-keyword'>if</span> <span class='hs-conid'>ForceReplace</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>opts</span> <span class='hs-varop'>||</span> <span class='hs-varid'>isJust</span> <span class='hs-varid'>work_replaced</span> <span class='hs-varop'>||</span> <span class='hs-varid'>isJust</span> <span class='hs-varid'>cur_replaced</span>
<a name="line-161"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>get_force_replace</span> <span class='hs-varid'>f</span> <span class='hs-varid'>toks</span> <span class='hs-varid'>work</span>
<a name="line-162"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>putStrLn</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Skipping file '"</span><span class='hs-varop'>++</span><span class='hs-varid'>f_fp</span><span class='hs-varop'>++</span><span class='hs-str'>"'"</span>
<a name="line-163"></a> <span class='hs-varid'>putStrLn</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Perhaps the recorded version of this "</span> <span class='hs-varop'>++</span>
<a name="line-164"></a> <span class='hs-str'>"file already contains '"</span> <span class='hs-varop'>++</span><span class='hs-varid'>new</span><span class='hs-varop'>++</span><span class='hs-str'>"'?"</span>
<a name="line-165"></a> <span class='hs-varid'>putStrLn</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Use the --force option to override."</span>
<a name="line-166"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>emptyGap</span> <span class='hs-conid'>NilFL</span><span class='hs-layout'>)</span>
<a name="line-167"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>f_fp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toFilePath</span> <span class='hs-varid'>f</span>
<a name="line-168"></a> <span class='hs-varid'>replace_patch</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>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-169"></a> <span class='hs-varid'>replace_patch</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tokreplace</span> <span class='hs-varid'>f_fp</span> <span class='hs-varid'>toks</span> <span class='hs-varid'>old</span> <span class='hs-varid'>new</span>
<a name="line-170"></a>
<a name="line-171"></a> <span class='hs-varid'>get_force_replace</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PrimPatch</span> <span class='hs-varid'>prim</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>SubPath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <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'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>FreeLeft</span> <span class='hs-layout'>(</span><span class='hs-conid'>FL</span> <span class='hs-varid'>prim</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-172"></a> <span class='hs-varid'>get_force_replace</span> <span class='hs-varid'>f</span> <span class='hs-varid'>toks</span> <span class='hs-varid'>tree</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-173"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>path</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>floatSubPath</span> <span class='hs-varid'>f</span>
<a name="line-174"></a> <span class='hs-varid'>content</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readBlob</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromJust</span> <span class='hs-varop'>$</span> <span class='hs-varid'>findFile</span> <span class='hs-varid'>tree</span> <span class='hs-varid'>path</span>
<a name="line-175"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>newcontent</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>forceTokReplace</span> <span class='hs-varid'>toks</span> <span class='hs-varid'>new</span> <span class='hs-varid'>old</span> <span class='hs-layout'>(</span><span class='hs-conid'>BS</span><span class='hs-varop'>.</span><span class='hs-varid'>concat</span> <span class='hs-varop'>$</span> <span class='hs-conid'>BL</span><span class='hs-varop'>.</span><span class='hs-varid'>toChunks</span> <span class='hs-varid'>content</span><span class='hs-layout'>)</span>
<a name="line-176"></a> <span class='hs-varid'>tree'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>modifyTree</span> <span class='hs-varid'>tree</span> <span class='hs-varid'>path</span> <span class='hs-layout'>(</span><span class='hs-conid'>File</span> <span class='hs-varop'>.</span> <span class='hs-varid'>makeBlobBS</span> <span class='hs-varop'><$></span> <span class='hs-varid'>newcontent</span><span class='hs-layout'>)</span>
<a name="line-177"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>newcontent</span> <span class='hs-keyword'>of</span>
<a name="line-178"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>bug</span> <span class='hs-str'>"weird forcing bug in replace."</span>
<a name="line-179"></a> <span class='hs-conid'>Just</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>pfix</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>treeDiff</span> <span class='hs-varid'>ftf</span> <span class='hs-varid'>tree</span> <span class='hs-varid'>tree'</span>
<a name="line-180"></a> <span class='hs-varid'>putStrLn</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Don't be surprised!"</span>
<a name="line-181"></a> <span class='hs-varid'>putStrLn</span> <span class='hs-varop'>$</span> <span class='hs-str'>"I've changed all instances of '"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>new</span> <span class='hs-varop'>++</span> <span class='hs-str'>"' to '"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>old</span> <span class='hs-varop'>++</span> <span class='hs-str'>"' first"</span>
<a name="line-182"></a> <span class='hs-varid'>putStrLn</span> <span class='hs-varop'>$</span> <span class='hs-str'>"so that darcs replace can token-replace them back into '"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>new</span> <span class='hs-varop'>++</span> <span class='hs-str'>"' again."</span>
<a name="line-183"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>joinGap</span> <span class='hs-layout'>(</span><span class='hs-varop'>+>+</span><span class='hs-layout'>)</span> <span class='hs-varid'>pfix</span> <span class='hs-layout'>(</span><span class='hs-varid'>freeGap</span> <span class='hs-layout'>(</span><span class='hs-varid'>tokreplace</span> <span class='hs-varid'>f_fp</span> <span class='hs-varid'>toks</span> <span class='hs-varid'>old</span> <span class='hs-varid'>new</span> <span class='hs-conop'>:>:</span> <span class='hs-conid'>NilFL</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-184"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>f_fp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toFilePath</span> <span class='hs-varid'>f</span>
<a name="line-185"></a>
<a name="line-186"></a><span class='hs-definition'>replaceCmd</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Usage: darcs replace OLD NEW [FILES]"</span>
<a name="line-187"></a>
<a name="line-188"></a><a name="floatSubPath"></a><span class='hs-definition'>floatSubPath</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SubPath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>AnchoredPath</span>
<a name="line-189"></a><span class='hs-definition'>floatSubPath</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>floatPath</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fn2fp</span> <span class='hs-varop'>.</span> <span class='hs-varid'>sp2fn</span>
<a name="line-190"></a>
<a name="line-191"></a><a name="maybeApplyToTree"></a><span class='hs-definition'>maybeApplyToTree</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> <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-conid'>Tree</span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Tree</span> <span class='hs-conid'>IO</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-192"></a><span class='hs-definition'>maybeApplyToTree</span> <span class='hs-varid'>patch</span> <span class='hs-varid'>tree</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>applyToTree</span> <span class='hs-varid'>patch</span> <span class='hs-varid'>tree</span><span class='hs-layout'>)</span>
<a name="line-193"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-194"></a>
<a name="line-195"></a><a name="defaultToks"></a><span class='hs-definition'>defaultToks</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-196"></a><span class='hs-definition'>defaultToks</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"A-Za-z_0-9"</span>
<a name="line-197"></a><a name="filenameToks"></a><span class='hs-definition'>filenameToks</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-198"></a><span class='hs-definition'>filenameToks</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"A-Za-z_0-9\\-\\."</span>
<a name="line-199"></a>
<a name="line-200"></a><a name="isTok"></a><span class='hs-comment'>-- | Given a set of characters and a string, returns true iff the</span>
<a name="line-201"></a><span class='hs-comment'>-- string contains only characters from the set. A set beginning with</span>
<a name="line-202"></a><span class='hs-comment'>-- a caret (@^@) is treated as a complementary set.</span>
<a name="line-203"></a><span class='hs-definition'>isTok</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-204"></a><span class='hs-definition'>isTok</span> <span class='hs-keyword'>_</span> <span class='hs-str'>""</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-205"></a><span class='hs-definition'>isTok</span> <span class='hs-varid'>toks</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>all</span> <span class='hs-layout'>(</span><span class='hs-varid'>regChars</span> <span class='hs-varid'>toks</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span>
<a name="line-206"></a>
<a name="line-207"></a><a name="chooseToks"></a><span class='hs-comment'>-- | This function checks for @--token-chars@ on the command-line. If</span>
<a name="line-208"></a><span class='hs-comment'>-- found, it validates the argument and returns it, without the</span>
<a name="line-209"></a><span class='hs-comment'>-- surrounding square brackets. Otherwise, it returns either</span>
<a name="line-210"></a><span class='hs-comment'>-- 'defaultToks' or 'filenameToks' as explained in 'replaceHelp'.</span>
<a name="line-211"></a><span class='hs-comment'>--</span>
<a name="line-212"></a><span class='hs-comment'>-- Note: Limitations in the current replace patch file format prevents</span>
<a name="line-213"></a><span class='hs-comment'>-- tokens and token-char specifiers from containing any whitespace.</span>
<a name="line-214"></a><span class='hs-definition'>chooseToks</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-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span>
<a name="line-215"></a><span class='hs-definition'>chooseToks</span> <span class='hs-layout'>(</span><span class='hs-conid'>Toks</span> <span class='hs-varid'>t</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span>
<a name="line-216"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>length</span> <span class='hs-varid'>t</span> <span class='hs-varop'><=</span> <span class='hs-num'>2</span> <span class='hs-keyglyph'>=</span>
<a name="line-217"></a> <span class='hs-varid'>bad_token_spec</span> <span class='hs-varop'>$</span> <span class='hs-str'>"It must contain more than 2 characters, because "</span> <span class='hs-varop'>++</span>
<a name="line-218"></a> <span class='hs-str'>"it should be enclosed in square brackets"</span>
<a name="line-219"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>head</span> <span class='hs-varid'>t</span> <span class='hs-varop'>/=</span> <span class='hs-chr'>'['</span> <span class='hs-varop'>||</span> <span class='hs-varid'>last</span> <span class='hs-varid'>t</span> <span class='hs-varop'>/=</span> <span class='hs-chr'>']'</span> <span class='hs-keyglyph'>=</span>
<a name="line-220"></a> <span class='hs-varid'>bad_token_spec</span> <span class='hs-str'>"It should be enclosed in square brackets"</span>
<a name="line-221"></a> <span class='hs-keyglyph'>|</span> <span class='hs-chr'>'^'</span> <span class='hs-varop'>==</span> <span class='hs-varid'>head</span> <span class='hs-varid'>tok</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>length</span> <span class='hs-varid'>tok</span> <span class='hs-varop'>==</span> <span class='hs-num'>1</span> <span class='hs-keyglyph'>=</span>
<a name="line-222"></a> <span class='hs-varid'>bad_token_spec</span> <span class='hs-str'>"Must be at least one character in the complementary set"</span>
<a name="line-223"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>any</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span>
<a name="line-224"></a> <span class='hs-varid'>bad_token_spec</span> <span class='hs-str'>"Space is not allowed in the spec"</span>
<a name="line-225"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>any</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bad_token_spec</span> <span class='hs-varop'>$</span> <span class='hs-varid'>spacey_token</span> <span class='hs-varid'>a</span>
<a name="line-226"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>any</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bad_token_spec</span> <span class='hs-varop'>$</span> <span class='hs-varid'>spacey_token</span> <span class='hs-varid'>b</span>
<a name="line-227"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-varid'>isTok</span> <span class='hs-varid'>tok</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bad_token_spec</span> <span class='hs-varop'>$</span> <span class='hs-varid'>not_a_token</span> <span class='hs-varid'>a</span>
<a name="line-228"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-varid'>isTok</span> <span class='hs-varid'>tok</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bad_token_spec</span> <span class='hs-varop'>$</span> <span class='hs-varid'>not_a_token</span> <span class='hs-varid'>b</span>
<a name="line-229"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>tok</span>
<a name="line-230"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>tok</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>init</span> <span class='hs-varop'>$</span> <span class='hs-varid'>tail</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-231"></a> <span class='hs-varid'>bad_token_spec</span> <span class='hs-varid'>msg</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Bad token spec: '"</span><span class='hs-varop'>++</span> <span class='hs-varid'>t</span> <span class='hs-varop'>++</span><span class='hs-str'>"' ("</span><span class='hs-varop'>++</span> <span class='hs-varid'>msg</span> <span class='hs-varop'>++</span><span class='hs-str'>")"</span>
<a name="line-232"></a> <span class='hs-varid'>spacey_token</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>++</span> <span class='hs-str'>" must not contain any space"</span>
<a name="line-233"></a> <span class='hs-varid'>not_a_token</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>++</span> <span class='hs-str'>" is not a token, according to your spec"</span>
<a name="line-234"></a><span class='hs-definition'>chooseToks</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>fs</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>chooseToks</span> <span class='hs-varid'>fs</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span>
<a name="line-235"></a><span class='hs-definition'>chooseToks</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>isTok</span> <span class='hs-varid'>defaultToks</span> <span class='hs-varid'>a</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>isTok</span> <span class='hs-varid'>defaultToks</span> <span class='hs-varid'>b</span>
<a name="line-236"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-varid'>defaultToks</span>
<a name="line-237"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-varid'>filenameToks</span>
<a name="line-238"></a>
</pre></body>
</html>
