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</script></head><body><div id="package-header"><ul class="links" id="page-menu"><li><a href="index.html">Contents</a></li><li><a href="doc-index.html">Index</a></li></ul><p class="caption">Cabal-1.14.0: A framework for packaging Haskell software</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Portability</th><td>portable</td></tr><tr><th>Maintainer</th><td>cabal-devel@haskell.org</td></tr><tr><th>Safe Haskell</th><td>None</td></tr></table><p class="caption">Distribution.Simple.PackageIndex</p></div><div id="table-of-contents"><p class="caption">Contents</p><ul><li><a href="#g:1">Package index data type
</a></li><li><a href="#g:2">Creating an index
</a></li><li><a href="#g:3">Updates
</a></li><li><a href="#g:4">Queries
</a><ul><li><a href="#g:5">Precise lookups
</a></li><li><a href="#g:6">Case-insensitive searches
</a></li><li><a href="#g:7">Bulk queries
</a></li><li><a href="#g:8">Special queries
</a></li></ul></li></ul></div><div id="description"><p class="caption">Description</p><div class="doc"><p>An index of packages.
</p></div></div><div id="synopsis"><p id="control.syn" class="caption expander" onclick="toggleSection('syn')">Synopsis</p><ul id="section.syn" class="hide" onclick="toggleSection('syn')"><li class="src short"><span class="keyword">data</span> <a href="#t:PackageIndex">PackageIndex</a> </li><li class="src short"><a href="#v:fromList">fromList</a> :: [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>] -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></li><li class="src short"><a href="#v:merge">merge</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></li><li class="src short"><a href="#v:insert">insert</a> :: <a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></li><li class="src short"><a href="#v:deleteInstalledPackageId">deleteInstalledPackageId</a> :: <a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></li><li class="src short"><a href="#v:deleteSourcePackageId">deleteSourcePackageId</a> :: <a href="Distribution-Package.html#t:PackageId">PackageId</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></li><li class="src short"><a href="#v:deletePackageName">deletePackageName</a> :: <a href="Distribution-Package.html#t:PackageName">PackageName</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></li><li class="src short"><a href="#v:lookupInstalledPackageId">lookupInstalledPackageId</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a> -> <a href="../base-4.5.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a></li><li class="src short"><a href="#v:lookupSourcePackageId">lookupSourcePackageId</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Package.html#t:PackageId">PackageId</a> -> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</li><li class="src short"><a href="#v:lookupPackageName">lookupPackageName</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Package.html#t:PackageName">PackageName</a> -> [(<a href="Distribution-Version.html#t:Version">Version</a>, [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>])]</li><li class="src short"><a href="#v:lookupDependency">lookupDependency</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Package.html#t:Dependency">Dependency</a> -> [(<a href="Distribution-Version.html#t:Version">Version</a>, [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>])]</li><li class="src short"><a href="#v:searchByName">searchByName</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -> <a href="Distribution-Simple-PackageIndex.html#t:SearchResult">SearchResult</a> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</li><li class="src short"><span class="keyword">data</span> <a href="#t:SearchResult">SearchResult</a> a<ul class="subs"><li>= <a href="#v:None">None</a> </li><li>| <a href="#v:Unambiguous">Unambiguous</a> a </li><li>| <a href="#v:Ambiguous">Ambiguous</a> [a] </li></ul></li><li class="src short"><a href="#v:searchByNameSubstring">searchByNameSubstring</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</li><li class="src short"><a href="#v:allPackages">allPackages</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</li><li class="src short"><a href="#v:allPackagesByName">allPackagesByName</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [[<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]]</li><li class="src short"><a href="#v:brokenPackages">brokenPackages</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [(<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>, [<a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a>])]</li><li class="src short"><a href="#v:dependencyClosure">dependencyClosure</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [<a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a>] -> <a href="../base-4.5.1.0/Data-Either.html#t:Either">Either</a> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> [(<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>, [<a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a>])]</li><li class="src short"><a href="#v:reverseDependencyClosure">reverseDependencyClosure</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [<a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a>] -> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</li><li class="src short"><a href="#v:topologicalOrder">topologicalOrder</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</li><li class="src short"><a href="#v:reverseTopologicalOrder">reverseTopologicalOrder</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</li><li class="src short"><a href="#v:dependencyInconsistencies">dependencyInconsistencies</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [(<a href="Distribution-Package.html#t:PackageName">PackageName</a>, [(<a href="Distribution-Package.html#t:PackageId">PackageId</a>, <a href="Distribution-Version.html#t:Version">Version</a>)])]</li><li class="src short"><a href="#v:dependencyCycles">dependencyCycles</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [[<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]]</li><li class="src short"><a href="#v:dependencyGraph">dependencyGraph</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> (<a href="../containers-0.4.2.1/Data-Graph.html#t:Graph">Graph</a>, <a href="../containers-0.4.2.1/Data-Graph.html#t:Vertex">Vertex</a> -> <a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>, <a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a> -> <a href="../base-4.5.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="../containers-0.4.2.1/Data-Graph.html#t:Vertex">Vertex</a>)</li><li class="src short"><a href="#v:moduleNameIndex">moduleNameIndex</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="../containers-0.4.2.1/Data-Map.html#t:Map">Map</a> <a href="Distribution-ModuleName.html#t:ModuleName">ModuleName</a> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</li></ul></div><div id="interface"><h1 id="g:1">Package index data type
</h1><div class="top"><p class="src"><span class="keyword">data</span> <a name="t:PackageIndex" class="def">PackageIndex</a> </p><div class="doc"><p>The collection of information about packages from one or more <code>PackageDB</code>s.
</p><p>Packages are uniquely identified in by their <code><a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a></code>, they can
also be effeciently looked up by package name or by name and version.
</p></div><div class="subs instances"><p id="control.i:PackageIndex" class="caption collapser" onclick="toggleSection('i:PackageIndex')">Instances</p><div id="section.i:PackageIndex" class="show"><table><tr><td class="src"><a href="../base-4.5.1.0/Text-Read.html#t:Read">Read</a> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="../base-4.5.1.0/Text-Show.html#t:Show">Show</a> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="../base-4.5.1.0/Data-Monoid.html#t:Monoid">Monoid</a> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></td><td class="doc empty"> </td></tr></table></div></div></div><h1 id="g:2">Creating an index
</h1><div class="top"><p class="src"><a name="v:fromList" class="def">fromList</a> :: [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>] -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></p><div class="doc"><p>Build an index out of a bunch of packages.
</p><p>If there are duplicates by <code><a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a></code> then later ones mask earlier
ones.
</p></div></div><h1 id="g:3">Updates
</h1><div class="top"><p class="src"><a name="v:merge" class="def">merge</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></p><div class="doc"><p>Merge two indexes.
</p><p>Packages from the second mask packages from the first if they have the exact
same <code><a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a></code>.
</p><p>For packages with the same source <code><a href="Distribution-Package.html#t:PackageId">PackageId</a></code>, packages from the second are
"preferred" over those from the first. Being preferred means they are top
result when we do a lookup by source <code><a href="Distribution-Package.html#t:PackageId">PackageId</a></code>. This is the mechanism we
use to prefer user packages over global packages.
</p></div></div><div class="top"><p class="src"><a name="v:insert" class="def">insert</a> :: <a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></p><div class="doc"><p>Inserts a single package into the index.
</p><p>This is equivalent to (but slightly quicker than) using <code><a href="../base-4.5.1.0/Data-Monoid.html#v:mappend">mappend</a></code> or
<code><a href="Distribution-Simple-PackageIndex.html#v:merge">merge</a></code> with a singleton index.
</p></div></div><div class="top"><p class="src"><a name="v:deleteInstalledPackageId" class="def">deleteInstalledPackageId</a> :: <a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></p><div class="doc"><p>Removes a single installed package from the index.
</p></div></div><div class="top"><p class="src"><a name="v:deleteSourcePackageId" class="def">deleteSourcePackageId</a> :: <a href="Distribution-Package.html#t:PackageId">PackageId</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></p><div class="doc"><p>Removes all packages with this source <code><a href="Distribution-Package.html#t:PackageId">PackageId</a></code> from the index.
</p></div></div><div class="top"><p class="src"><a name="v:deletePackageName" class="def">deletePackageName</a> :: <a href="Distribution-Package.html#t:PackageName">PackageName</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a></p><div class="doc"><p>Removes all packages with this (case-sensitive) name from the index.
</p></div></div><h1 id="g:4">Queries
</h1><h2 id="g:5">Precise lookups
</h2><div class="top"><p class="src"><a name="v:lookupInstalledPackageId" class="def">lookupInstalledPackageId</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a> -> <a href="../base-4.5.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a></p><div class="doc"><p>Does a lookup by source package id (name & version).
</p><p>Since multiple package DBs mask each other by <code><a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a></code>,
then we get back at most one package.
</p></div></div><div class="top"><p class="src"><a name="v:lookupSourcePackageId" class="def">lookupSourcePackageId</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Package.html#t:PackageId">PackageId</a> -> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</p><div class="doc"><p>Does a lookup by source package id (name & version).
</p><p>There can be multiple installed packages with the same source <code><a href="Distribution-Package.html#t:PackageId">PackageId</a></code>
but different <code><a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a></code>. They are returned in order of
preference, with the most preferred first.
</p></div></div><div class="top"><p class="src"><a name="v:lookupPackageName" class="def">lookupPackageName</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Package.html#t:PackageName">PackageName</a> -> [(<a href="Distribution-Version.html#t:Version">Version</a>, [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>])]</p><div class="doc"><p>Does a lookup by source package name.
</p></div></div><div class="top"><p class="src"><a name="v:lookupDependency" class="def">lookupDependency</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="Distribution-Package.html#t:Dependency">Dependency</a> -> [(<a href="Distribution-Version.html#t:Version">Version</a>, [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>])]</p><div class="doc"><p>Does a lookup by source package name and a range of versions.
</p><p>We get back any number of versions of the specified package name, all
satisfying the version range constraint.
</p></div></div><h2 id="g:6">Case-insensitive searches
</h2><div class="top"><p class="src"><a name="v:searchByName" class="def">searchByName</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -> <a href="Distribution-Simple-PackageIndex.html#t:SearchResult">SearchResult</a> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</p><div class="doc"><p>Does a case-insensitive search by package name.
</p><p>If there is only one package that compares case-insentiviely to this name
then the search is unambiguous and we get back all versions of that package.
If several match case-insentiviely but one matches exactly then it is also
unambiguous.
</p><p>If however several match case-insentiviely and none match exactly then we
have an ambiguous result, and we get back all the versions of all the
packages. The list of ambiguous results is split by exact package name. So
it is a non-empty list of non-empty lists.
</p></div></div><div class="top"><p class="src"><span class="keyword">data</span> <a name="t:SearchResult" class="def">SearchResult</a> a </p><div class="subs constructors"><p class="caption">Constructors</p><table><tr><td class="src"><a name="v:None" class="def">None</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a name="v:Unambiguous" class="def">Unambiguous</a> a</td><td class="doc empty"> </td></tr><tr><td class="src"><a name="v:Ambiguous" class="def">Ambiguous</a> [a]</td><td class="doc empty"> </td></tr></table></div></div><div class="top"><p class="src"><a name="v:searchByNameSubstring" class="def">searchByNameSubstring</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</p><div class="doc"><p>Does a case-insensitive substring search by package name.
</p><p>That is, all packages that contain the given string in their name.
</p></div></div><h2 id="g:7">Bulk queries
</h2><div class="top"><p class="src"><a name="v:allPackages" class="def">allPackages</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</p><div class="doc"><p>Get all the packages from the index.
</p></div></div><div class="top"><p class="src"><a name="v:allPackagesByName" class="def">allPackagesByName</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [[<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]]</p><div class="doc"><p>Get all the packages from the index.
</p><p>They are grouped by package name, case-sensitively.
</p></div></div><h2 id="g:8">Special queries
</h2><div class="top"><p class="src"><a name="v:brokenPackages" class="def">brokenPackages</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [(<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>, [<a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a>])]</p><div class="doc"><p>All packages that have immediate dependencies that are not in the index.
</p><p>Returns such packages along with the dependencies that they're missing.
</p></div></div><div class="top"><p class="src"><a name="v:dependencyClosure" class="def">dependencyClosure</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [<a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a>] -> <a href="../base-4.5.1.0/Data-Either.html#t:Either">Either</a> <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> [(<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>, [<a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a>])]</p><div class="doc"><p>Tries to take the transitive closure of the package dependencies.
</p><p>If the transitive closure is complete then it returns that subset of the
index. Otherwise it returns the broken packages as in <code><a href="Distribution-Simple-PackageIndex.html#v:brokenPackages">brokenPackages</a></code>.
</p><ul><li> Note that if the result is <code>Right []</code> it is because at least one of
the original given <code><a href="Distribution-Package.html#t:PackageId">PackageId</a></code>s do not occur in the index.
</li></ul></div></div><div class="top"><p class="src"><a name="v:reverseDependencyClosure" class="def">reverseDependencyClosure</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [<a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a>] -> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</p><div class="doc"><p>Takes the transitive closure of the packages reverse dependencies.
</p><ul><li> The given <code><a href="Distribution-Package.html#t:PackageId">PackageId</a></code>s must be in the index.
</li></ul></div></div><div class="top"><p class="src"><a name="v:topologicalOrder" class="def">topologicalOrder</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</p></div><div class="top"><p class="src"><a name="v:reverseTopologicalOrder" class="def">reverseTopologicalOrder</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</p></div><div class="top"><p class="src"><a name="v:dependencyInconsistencies" class="def">dependencyInconsistencies</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [(<a href="Distribution-Package.html#t:PackageName">PackageName</a>, [(<a href="Distribution-Package.html#t:PackageId">PackageId</a>, <a href="Distribution-Version.html#t:Version">Version</a>)])]</p><div class="doc"><p>Given a package index where we assume we want to use all the packages
(use <code><a href="Distribution-Simple-PackageIndex.html#v:dependencyClosure">dependencyClosure</a></code> if you need to get such a index subset) find out
if the dependencies within it use consistent versions of each package.
Return all cases where multiple packages depend on different versions of
some other package.
</p><p>Each element in the result is a package name along with the packages that
depend on it and the versions they require. These are guaranteed to be
distinct.
</p></div></div><div class="top"><p class="src"><a name="v:dependencyCycles" class="def">dependencyCycles</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> [[<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]]</p><div class="doc"><p>Find if there are any cycles in the dependency graph. If there are no
cycles the result is <code>[]</code>.
</p><p>This actually computes the strongly connected components. So it gives us a
list of groups of packages where within each group they all depend on each
other, directly or indirectly.
</p></div></div><div class="top"><p class="src"><a name="v:dependencyGraph" class="def">dependencyGraph</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> (<a href="../containers-0.4.2.1/Data-Graph.html#t:Graph">Graph</a>, <a href="../containers-0.4.2.1/Data-Graph.html#t:Vertex">Vertex</a> -> <a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>, <a href="Distribution-Package.html#t:InstalledPackageId">InstalledPackageId</a> -> <a href="../base-4.5.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="../containers-0.4.2.1/Data-Graph.html#t:Vertex">Vertex</a>)</p><div class="doc"><p>Builds a graph of the package dependencies.
</p><p>Dependencies on other packages that are not in the index are discarded.
You can check if there are any such dependencies with <code><a href="Distribution-Simple-PackageIndex.html#v:brokenPackages">brokenPackages</a></code>.
</p></div></div><div class="top"><p class="src"><a name="v:moduleNameIndex" class="def">moduleNameIndex</a> :: <a href="Distribution-Simple-PackageIndex.html#t:PackageIndex">PackageIndex</a> -> <a href="../containers-0.4.2.1/Data-Map.html#t:Map">Map</a> <a href="Distribution-ModuleName.html#t:ModuleName">ModuleName</a> [<a href="Distribution-InstalledPackageInfo.html#t:InstalledPackageInfo">InstalledPackageInfo</a>]</p></div></div></div><div id="footer"><p>Produced by <a href="http://www.haskell.org/haddock/">Haddock</a> version 2.11.0</p></div></body></html>
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