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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-cpp'>#ifndef MIN_VERSION_base</span>
<a name="line-4"></a><span class='hs-cpp'>#define MIN_VERSION_base(x,y,z) 1</span>
<a name="line-5"></a><span class='hs-cpp'>#endif</span>
<a name="line-6"></a>
<a name="line-7"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-8"></a><span class='hs-comment'>-- |</span>
<a name="line-9"></a><span class='hs-comment'>-- Module : System.FilePath.Lens</span>
<a name="line-10"></a><span class='hs-comment'>-- Copyright : (C) 2012-16 Edward Kmett</span>
<a name="line-11"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-12"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-13"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-14"></a><span class='hs-comment'>-- Portability : Rank2Types</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-17"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>FilePath</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-18"></a> <span class='hs-layout'>(</span>
<a name="line-19"></a> <span class='hs-comment'>-- * Operators</span>
<a name="line-20"></a> <span class='hs-layout'>(</span><span class='hs-varop'></>~</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-layout'>(</span><span class='hs-varop'><<</>~</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-layout'>(</span><span class='hs-varop'><<.>~</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>
<a name="line-21"></a> <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-layout'>(</span><span class='hs-varop'><</>=</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-layout'>(</span><span class='hs-varop'><.>=</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-layout'>(</span><span class='hs-varop'><<<.>=</span><span class='hs-layout'>)</span>
<a name="line-22"></a> <span class='hs-comment'>-- * Lenses</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>basename</span><span class='hs-layout'>,</span> <span class='hs-varid'>directory</span><span class='hs-layout'>,</span> <span class='hs-varid'>extension</span><span class='hs-layout'>,</span> <span class='hs-varid'>filename</span>
<a name="line-24"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-25"></a>
<a name="line-26"></a><span class='hs-cpp'>#if !MIN_VERSION_base(4,8,0)</span>
<a name="line-27"></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-28"></a><span class='hs-cpp'>#endif</span>
<a name="line-29"></a>
<a name="line-30"></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-varop'>.</span><span class='hs-conid'>State</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>State</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>FilePath</span>
<a name="line-32"></a> <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-layout'>(</span><span class='hs-varop'><.></span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>splitExtension</span>
<a name="line-33"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>takeBaseName</span><span class='hs-layout'>,</span> <span class='hs-varid'>takeDirectory</span>
<a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>takeExtension</span><span class='hs-layout'>,</span> <span class='hs-varid'>takeFileName</span>
<a name="line-35"></a> <span class='hs-layout'>)</span>
<a name="line-36"></a>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span> <span class='hs-varid'>hiding</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-38"></a>
<a name="line-39"></a><span class='hs-comment'>-- $setup</span>
<a name="line-40"></a><span class='hs-comment'>-- >>> :set -XNoOverloadedStrings</span>
<a name="line-41"></a>
<a name="line-42"></a><span class='hs-comment'>{- NB: Be very careful if you are planning to modify the doctest output in
<a name="line-43"></a>this module! Path separators are OS-dependent (\\ with Windows, / with Posix),
<a name="line-44"></a>so we take great care to avoid using separators in doctest output so that they
<a name="line-45"></a>will be valid on all operating systems.
<a name="line-46"></a>
<a name="line-47"></a>If you find yourself wanting to test a function that uses path separators in
<a name="line-48"></a>the output, it would be wise to:
<a name="line-49"></a>
<a name="line-50"></a>1. Compare the tested expression and the expected results explicitly using (==).
<a name="line-51"></a>2. Always use the </> function (and derived combinators) to construct path
<a name="line-52"></a> separators instead of typing them manually. That is, don't type out
<a name="line-53"></a> "foo/bar", but rather "foo" </> "bar".
<a name="line-54"></a>
<a name="line-55"></a>This way we can avoid leaking path separators into the output. See the doctest
<a name="line-56"></a>example for (</>~) for an example of how to do this.
<a name="line-57"></a>-}</span>
<a name="line-58"></a>
<a name="line-59"></a><span class='hs-keyword'>infixr</span> <span class='hs-num'>4</span> <span class='hs-varop'></>~</span><span class='hs-layout'>,</span> <span class='hs-varop'><</>~</span><span class='hs-layout'>,</span> <span class='hs-varop'><<</>~</span><span class='hs-layout'>,</span> <span class='hs-varop'><.>~</span><span class='hs-layout'>,</span> <span class='hs-varop'><<.>~</span><span class='hs-layout'>,</span> <span class='hs-varop'><<<.>~</span>
<a name="line-60"></a><span class='hs-keyword'>infix</span> <span class='hs-num'>4</span> <span class='hs-varop'></>=</span><span class='hs-layout'>,</span> <span class='hs-varop'><</>=</span><span class='hs-layout'>,</span> <span class='hs-varop'><<</>=</span><span class='hs-layout'>,</span> <span class='hs-varop'><.>=</span><span class='hs-layout'>,</span> <span class='hs-varop'><<.>=</span><span class='hs-layout'>,</span> <span class='hs-varop'><<<.>=</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="%3c/%3e~"></a><span class='hs-comment'>-- | Modify the path by adding another path.</span>
<a name="line-63"></a><span class='hs-comment'>--</span>
<a name="line-64"></a><span class='hs-comment'>-- >>> (both </>~ "bin" $ ("hello","world")) == ("hello" </> "bin", "world" </> "bin")</span>
<a name="line-65"></a><span class='hs-comment'>-- True</span>
<a name="line-66"></a><span class='hs-comment'>--</span>
<a name="line-67"></a><span class='hs-comment'>-- @</span>
<a name="line-68"></a><span class='hs-comment'>-- ('</>~') :: 'Setter' s a 'FilePath' 'FilePath' -> 'FilePath' -> s -> a</span>
<a name="line-69"></a><span class='hs-comment'>-- ('</>~') :: 'Iso' s a 'FilePath' 'FilePath' -> 'FilePath' -> s -> a</span>
<a name="line-70"></a><span class='hs-comment'>-- ('</>~') :: 'Lens' s a 'FilePath' 'FilePath' -> 'FilePath' -> s -> a</span>
<a name="line-71"></a><span class='hs-comment'>-- ('</>~') :: 'Traversal' s a 'FilePath' 'FilePath' -> 'FilePath' -> s -> a</span>
<a name="line-72"></a><span class='hs-comment'>-- @</span>
<a name="line-73"></a><span class='hs-layout'>(</span><span class='hs-varop'></>~</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ASetter</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-conid'>FilePath</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span>
<a name="line-74"></a><a name="l"></a><span class='hs-definition'>l</span> <span class='hs-varop'></>~</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>over</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-varop'></></span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-75"></a><span class='hs-comment'>{-# INLINE (</>~) #-}</span>
<a name="line-76"></a>
<a name="line-77"></a>
<a name="line-78"></a><a name="%3c/%3e="></a><span class='hs-comment'>-- | Modify the target(s) of a 'Lens'', 'Iso'', 'Setter'' or 'Traversal'' by adding a path.</span>
<a name="line-79"></a><span class='hs-comment'>--</span>
<a name="line-80"></a><span class='hs-comment'>-- >>> execState (both </>= "bin") ("hello","world") == ("hello" </> "bin", "world" </> "bin")</span>
<a name="line-81"></a><span class='hs-comment'>-- True</span>
<a name="line-82"></a><span class='hs-comment'>--</span>
<a name="line-83"></a><span class='hs-comment'>-- @</span>
<a name="line-84"></a><span class='hs-comment'>-- ('</>=') :: 'MonadState' s m => 'Setter'' s 'FilePath' -> 'FilePath' -> m ()</span>
<a name="line-85"></a><span class='hs-comment'>-- ('</>=') :: 'MonadState' s m => 'Iso'' s 'FilePath' -> 'FilePath' -> m ()</span>
<a name="line-86"></a><span class='hs-comment'>-- ('</>=') :: 'MonadState' s m => 'Lens'' s 'FilePath' -> 'FilePath' -> m ()</span>
<a name="line-87"></a><span class='hs-comment'>-- ('</>=') :: 'MonadState' s m => 'Traversal'' s 'FilePath' -> 'FilePath' -> m ()</span>
<a name="line-88"></a><span class='hs-comment'>-- @</span>
<a name="line-89"></a><span class='hs-layout'>(</span><span class='hs-varop'></>=</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ASetter'</span> <span class='hs-varid'>s</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-90"></a><span class='hs-definition'>l</span> <span class='hs-varop'></>=</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>State</span><span class='hs-varop'>.</span><span class='hs-varid'>modify</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varop'></>~</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-91"></a><span class='hs-comment'>{-# INLINE (</>=) #-}</span>
<a name="line-92"></a>
<a name="line-93"></a>
<a name="line-94"></a><a name="%3c%3c/%3e~"></a><span class='hs-comment'>-- | Add a path onto the end of the target of a 'Lens' and return the result</span>
<a name="line-95"></a><span class='hs-comment'>--</span>
<a name="line-96"></a><span class='hs-comment'>-- When you do not need the result of the operation, ('</>~') is more flexible.</span>
<a name="line-97"></a><span class='hs-layout'>(</span><span class='hs-varop'><</>~</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensLike</span> <span class='hs-layout'>(</span><span class='hs-conid'>(,)</span><span class='hs-conid'>FilePath</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-conid'>FilePath</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>FilePath</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-98"></a><span class='hs-definition'>l</span> <span class='hs-varop'><</>~</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varop'><%~</span> <span class='hs-layout'>(</span><span class='hs-varop'></></span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-99"></a><span class='hs-comment'>{-# INLINE (<</>~) #-}</span>
<a name="line-100"></a>
<a name="line-101"></a>
<a name="line-102"></a><a name="%3c%3c/%3e="></a><span class='hs-comment'>-- | Add a path onto the end of the target of a 'Lens' into</span>
<a name="line-103"></a><span class='hs-comment'>-- your monad's state and return the result.</span>
<a name="line-104"></a><span class='hs-comment'>--</span>
<a name="line-105"></a><span class='hs-comment'>-- When you do not need the result of the operation, ('</>=') is more flexible.</span>
<a name="line-106"></a><span class='hs-layout'>(</span><span class='hs-varop'><</>=</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>LensLike'</span> <span class='hs-layout'>(</span><span class='hs-conid'>(,)</span><span class='hs-conid'>FilePath</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>FilePath</span>
<a name="line-107"></a><span class='hs-definition'>l</span> <span class='hs-varop'><</>=</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varop'><%=</span> <span class='hs-layout'>(</span><span class='hs-varop'></></span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-108"></a><span class='hs-comment'>{-# INLINE (<</>=) #-}</span>
<a name="line-109"></a>
<a name="line-110"></a>
<a name="line-111"></a><a name="%3c%3c%3c/%3e~"></a><span class='hs-layout'>(</span><span class='hs-varop'><<</>~</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Optical'</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>-></span><span class='hs-layout'>)</span> <span class='hs-varid'>q</span> <span class='hs-layout'>(</span><span class='hs-conid'>(,)</span><span class='hs-conid'>FilePath</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>q</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>FilePath</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-112"></a><span class='hs-definition'>l</span> <span class='hs-varop'><<</>~</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span> <span class='hs-varop'></></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-113"></a><span class='hs-comment'>{-# INLINE (<<</>~) #-}</span>
<a name="line-114"></a>
<a name="line-115"></a><a name="%3c%3c%3c/%3e="></a><span class='hs-layout'>(</span><span class='hs-varop'><<</>=</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>LensLike'</span> <span class='hs-layout'>(</span><span class='hs-conid'>(,)</span><span class='hs-conid'>FilePath</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>FilePath</span>
<a name="line-116"></a><span class='hs-definition'>l</span> <span class='hs-varop'><<</>=</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varop'>%%=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span> <span class='hs-varop'></></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-117"></a><span class='hs-comment'>{-# INLINE (<<</>=) #-}</span>
<a name="line-118"></a>
<a name="line-119"></a><a name="%3c.%3e~"></a><span class='hs-comment'>-- | Modify the path by adding an extension.</span>
<a name="line-120"></a><span class='hs-comment'>--</span>
<a name="line-121"></a><span class='hs-comment'>-- >>> both <.>~ "txt" $ ("hello","world")</span>
<a name="line-122"></a><span class='hs-comment'>-- ("hello.txt","world.txt")</span>
<a name="line-123"></a><span class='hs-comment'>--</span>
<a name="line-124"></a><span class='hs-comment'>-- @</span>
<a name="line-125"></a><span class='hs-comment'>-- ('<.>~') :: 'Setter' s a 'FilePath' 'FilePath' -> 'String' -> s -> a</span>
<a name="line-126"></a><span class='hs-comment'>-- ('<.>~') :: 'Iso' s a 'FilePath' 'FilePath' -> 'String' -> s -> a</span>
<a name="line-127"></a><span class='hs-comment'>-- ('<.>~') :: 'Lens' s a 'FilePath' 'FilePath' -> 'String' -> s -> a</span>
<a name="line-128"></a><span class='hs-comment'>-- ('<.>~') :: 'Traversal' s a 'FilePath' 'FilePath' -> 'String' -> s -> a</span>
<a name="line-129"></a><span class='hs-comment'>-- @</span>
<a name="line-130"></a><span class='hs-layout'>(</span><span class='hs-varop'><.>~</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ASetter</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-conid'>FilePath</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-131"></a><span class='hs-definition'>l</span> <span class='hs-varop'><.>~</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>over</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-varop'><.></span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-132"></a><span class='hs-comment'>{-# INLINE (<.>~) #-}</span>
<a name="line-133"></a>
<a name="line-134"></a><a name="%3c.%3e="></a><span class='hs-comment'>-- | Modify the target(s) of a 'Lens'', 'Iso'', 'Setter'' or 'Traversal'' by adding an extension.</span>
<a name="line-135"></a><span class='hs-comment'>--</span>
<a name="line-136"></a><span class='hs-comment'>-- >>> execState (both <.>= "txt") ("hello","world")</span>
<a name="line-137"></a><span class='hs-comment'>-- ("hello.txt","world.txt")</span>
<a name="line-138"></a><span class='hs-comment'>--</span>
<a name="line-139"></a><span class='hs-comment'>-- @</span>
<a name="line-140"></a><span class='hs-comment'>-- ('<.>=') :: 'MonadState' s m => 'Setter'' s 'FilePath' -> 'String' -> m ()</span>
<a name="line-141"></a><span class='hs-comment'>-- ('<.>=') :: 'MonadState' s m => 'Iso'' s 'FilePath' -> 'String' -> m ()</span>
<a name="line-142"></a><span class='hs-comment'>-- ('<.>=') :: 'MonadState' s m => 'Lens'' s 'FilePath' -> 'String' -> m ()</span>
<a name="line-143"></a><span class='hs-comment'>-- ('<.>=') :: 'MonadState' s m => 'Traversal'' s 'FilePath' -> 'String' -> m ()</span>
<a name="line-144"></a><span class='hs-comment'>-- @</span>
<a name="line-145"></a><span class='hs-layout'>(</span><span class='hs-varop'><.>=</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ASetter'</span> <span class='hs-varid'>s</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-146"></a><span class='hs-definition'>l</span> <span class='hs-varop'><.>=</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>State</span><span class='hs-varop'>.</span><span class='hs-varid'>modify</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varop'><.>~</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-147"></a><span class='hs-comment'>{-# INLINE (<.>=) #-}</span>
<a name="line-148"></a>
<a name="line-149"></a><a name="%3c%3c.%3e~"></a><span class='hs-comment'>-- | Add an extension onto the end of the target of a 'Lens' and return the result</span>
<a name="line-150"></a><span class='hs-comment'>--</span>
<a name="line-151"></a><span class='hs-comment'>-- >>> _1 <<.>~ "txt" $ ("hello","world")</span>
<a name="line-152"></a><span class='hs-comment'>-- ("hello.txt",("hello.txt","world"))</span>
<a name="line-153"></a><span class='hs-comment'>--</span>
<a name="line-154"></a><span class='hs-comment'>-- When you do not need the result of the operation, ('<.>~') is more flexible.</span>
<a name="line-155"></a><span class='hs-layout'>(</span><span class='hs-varop'><<.>~</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensLike</span> <span class='hs-layout'>(</span><span class='hs-conid'>(,)</span><span class='hs-conid'>FilePath</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-conid'>FilePath</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>FilePath</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-156"></a><span class='hs-definition'>l</span> <span class='hs-varop'><<.>~</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varop'><%~</span> <span class='hs-layout'>(</span><span class='hs-varop'><.></span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-157"></a><span class='hs-comment'>{-# INLINE (<<.>~) #-}</span>
<a name="line-158"></a>
<a name="line-159"></a>
<a name="line-160"></a><a name="%3c%3c.%3e="></a><span class='hs-comment'>-- | Add an extension onto the end of the target of a 'Lens' into</span>
<a name="line-161"></a><span class='hs-comment'>-- your monad's state and return the result.</span>
<a name="line-162"></a><span class='hs-comment'>--</span>
<a name="line-163"></a><span class='hs-comment'>-- >>> evalState (_1 <<.>= "txt") ("hello","world")</span>
<a name="line-164"></a><span class='hs-comment'>-- "hello.txt"</span>
<a name="line-165"></a><span class='hs-comment'>--</span>
<a name="line-166"></a><span class='hs-comment'>-- When you do not need the result of the operation, ('<.>=') is more flexible.</span>
<a name="line-167"></a><span class='hs-layout'>(</span><span class='hs-varop'><<.>=</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>LensLike'</span> <span class='hs-layout'>(</span><span class='hs-conid'>(,)</span><span class='hs-conid'>FilePath</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>FilePath</span>
<a name="line-168"></a><span class='hs-definition'>l</span> <span class='hs-varop'><<.>=</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varop'><%=</span> <span class='hs-layout'>(</span><span class='hs-varop'><.></span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-169"></a><span class='hs-comment'>{-# INLINE (<<.>=) #-}</span>
<a name="line-170"></a>
<a name="line-171"></a><a name="%3c%3c%3c.%3e~"></a><span class='hs-comment'>-- | Add an extension onto the end of the target of a 'Lens' but</span>
<a name="line-172"></a><span class='hs-comment'>-- return the old value</span>
<a name="line-173"></a><span class='hs-comment'>--</span>
<a name="line-174"></a><span class='hs-comment'>-- >>> _1 <<<.>~ "txt" $ ("hello","world")</span>
<a name="line-175"></a><span class='hs-comment'>-- ("hello",("hello.txt","world"))</span>
<a name="line-176"></a><span class='hs-comment'>--</span>
<a name="line-177"></a><span class='hs-comment'>-- When you do not need the old value, ('<.>~') is more flexible.</span>
<a name="line-178"></a><span class='hs-layout'>(</span><span class='hs-varop'><<<.>~</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Optical'</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>-></span><span class='hs-layout'>)</span> <span class='hs-varid'>q</span> <span class='hs-layout'>(</span><span class='hs-conid'>(,)</span><span class='hs-conid'>FilePath</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>q</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>FilePath</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-179"></a><span class='hs-definition'>l</span> <span class='hs-varop'><<<.>~</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span> <span class='hs-varop'><.></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-180"></a><span class='hs-comment'>{-# INLINE (<<<.>~) #-}</span>
<a name="line-181"></a>
<a name="line-182"></a><a name="%3c%3c%3c.%3e="></a><span class='hs-layout'>(</span><span class='hs-varop'><<<.>=</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>LensLike'</span> <span class='hs-layout'>(</span><span class='hs-conid'>(,)</span><span class='hs-conid'>FilePath</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>FilePath</span>
<a name="line-183"></a><span class='hs-definition'>l</span> <span class='hs-varop'><<<.>=</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varop'>%%=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span> <span class='hs-varop'><.></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-184"></a><span class='hs-comment'>{-# INLINE (<<<.>=) #-}</span>
<a name="line-185"></a>
<a name="line-186"></a><a name="basename"></a><span class='hs-comment'>-- | A 'Lens' for reading and writing to the basename</span>
<a name="line-187"></a><span class='hs-comment'>--</span>
<a name="line-188"></a><span class='hs-comment'>-- Note: This is 'not' a legal 'Lens' unless the outer 'FilePath' has both a directory</span>
<a name="line-189"></a><span class='hs-comment'>-- and filename component and the generated basenames are not null and contain no directory</span>
<a name="line-190"></a><span class='hs-comment'>-- separators.</span>
<a name="line-191"></a><span class='hs-comment'>--</span>
<a name="line-192"></a><span class='hs-comment'>-- >>> (basename .~ "filename" $ "path" </> "name.png") == "path" </> "filename.png"</span>
<a name="line-193"></a><span class='hs-comment'>-- True</span>
<a name="line-194"></a><span class='hs-definition'>basename</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lens'</span> <span class='hs-conid'>FilePath</span> <span class='hs-conid'>FilePath</span>
<a name="line-195"></a><span class='hs-definition'>basename</span> <span class='hs-varid'>f</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'><.></span> <span class='hs-varid'>takeExtension</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varid'>takeDirectory</span> <span class='hs-varid'>p</span> <span class='hs-varop'></></span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>takeBaseName</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-196"></a><span class='hs-comment'>{-# INLINE basename #-}</span>
<a name="line-197"></a>
<a name="line-198"></a>
<a name="line-199"></a><a name="directory"></a><span class='hs-comment'>-- | A 'Lens' for reading and writing to the directory</span>
<a name="line-200"></a><span class='hs-comment'>--</span>
<a name="line-201"></a><span class='hs-comment'>-- Note: this is /not/ a legal 'Lens' unless the outer 'FilePath' already has a directory component,</span>
<a name="line-202"></a><span class='hs-comment'>-- and generated directories are not null.</span>
<a name="line-203"></a><span class='hs-comment'>--</span>
<a name="line-204"></a><span class='hs-comment'>-- >>> (("long" </> "path" </> "name.txt") ^. directory) == "long" </> "path"</span>
<a name="line-205"></a><span class='hs-comment'>-- True</span>
<a name="line-206"></a><span class='hs-definition'>directory</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lens'</span> <span class='hs-conid'>FilePath</span> <span class='hs-conid'>FilePath</span>
<a name="line-207"></a><span class='hs-definition'>directory</span> <span class='hs-varid'>f</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'></></span> <span class='hs-varid'>takeFileName</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>takeDirectory</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-208"></a><span class='hs-comment'>{-# INLINE directory #-}</span>
<a name="line-209"></a>
<a name="line-210"></a>
<a name="line-211"></a><a name="extension"></a><span class='hs-comment'>-- | A 'Lens' for reading and writing to the extension</span>
<a name="line-212"></a><span class='hs-comment'>--</span>
<a name="line-213"></a><span class='hs-comment'>-- Note: This is /not/ a legal 'Lens', unless you are careful to ensure that generated</span>
<a name="line-214"></a><span class='hs-comment'>-- extension 'FilePath' components are either null or start with 'System.FilePath.extSeparator'</span>
<a name="line-215"></a><span class='hs-comment'>-- and do not contain any internal 'System.FilePath.extSeparator's.</span>
<a name="line-216"></a><span class='hs-comment'>--</span>
<a name="line-217"></a><span class='hs-comment'>-- >>> (extension .~ ".png" $ "path" </> "name.txt") == "path" </> "name.png"</span>
<a name="line-218"></a><span class='hs-comment'>-- True</span>
<a name="line-219"></a><span class='hs-definition'>extension</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lens'</span> <span class='hs-conid'>FilePath</span> <span class='hs-conid'>FilePath</span>
<a name="line-220"></a><span class='hs-definition'>extension</span> <span class='hs-varid'>f</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-varop'><.></span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>f</span> <span class='hs-varid'>e</span>
<a name="line-221"></a> <span class='hs-keyword'>where</span>
<a name="line-222"></a> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>splitExtension</span> <span class='hs-varid'>p</span>
<a name="line-223"></a><span class='hs-comment'>{-# INLINE extension #-}</span>
<a name="line-224"></a>
<a name="line-225"></a>
<a name="line-226"></a><a name="filename"></a><span class='hs-comment'>-- | A 'Lens' for reading and writing to the full filename</span>
<a name="line-227"></a><span class='hs-comment'>--</span>
<a name="line-228"></a><span class='hs-comment'>-- Note: This is /not/ a legal 'Lens', unless you are careful to ensure that generated</span>
<a name="line-229"></a><span class='hs-comment'>-- filename 'FilePath' components are not null and do not contain any</span>
<a name="line-230"></a><span class='hs-comment'>-- elements of 'System.FilePath.pathSeparators's.</span>
<a name="line-231"></a><span class='hs-comment'>--</span>
<a name="line-232"></a><span class='hs-comment'>-- >>> (filename .~ "name.txt" $ "path" </> "name.png") == "path" </> "name.txt"</span>
<a name="line-233"></a><span class='hs-comment'>-- True</span>
<a name="line-234"></a><span class='hs-definition'>filename</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lens'</span> <span class='hs-conid'>FilePath</span> <span class='hs-conid'>FilePath</span>
<a name="line-235"></a><span class='hs-definition'>filename</span> <span class='hs-varid'>f</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>takeDirectory</span> <span class='hs-varid'>p</span> <span class='hs-varop'></></span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>takeFileName</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-236"></a><span class='hs-comment'>{-# INLINE filename #-}</span>
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