Walk a directory/Recursively: Difference between revisions
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'''Note:''' Please be careful when running any code examples found here. |
'''Note:''' Please be careful when running any code examples found here. |
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=={{header|D}}== |
=={{header|D}}== |
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module std.file |
module std.file provides different walk directory functions (listdir).<br> |
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This one recursively |
This one recursively walks the directory, which can either match by regular expression or unix shell style pattern. |
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<pre>import std.stdio; |
<pre>import std.stdio; |
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import std.file; |
import std.file; |
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writefln(d); |
writefln(d); |
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}</pre> |
}</pre> |
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This one does not itself walk into sub directory, but can be recursive by a callback delegate function. |
This one does not itself walk into a sub directory, but can be recursive by a callback delegate function. |
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<pre>import std.stdio; |
<pre>import std.stdio; |
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import std.file; |
import std.file; |
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Done using no pattern. But with end string comparison which gave better results. |
Done using no pattern. But with end string comparison which gave better results. |
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<java>import java.io.File; |
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public class MainEntry { |
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public static void main(String[] args) { |
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walkin(new File("/home/user")); //Replace this with a suitable directory |
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} |
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/** |
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* Recursive function to descend into the directory tree and find all the files |
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* that end with ".mp3" |
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* @param dir A file object defining the top directory |
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**/ |
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public static void walkin(File dir) { |
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String pattern = ".mp3"; |
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File listFile[] = dir.listFiles(); |
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if(listFile != null) { |
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for(int i=0; i<listFile.length; i++) { |
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if(listFile[i].isDirectory()) { |
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walkin(listFile[i]); |
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} else { |
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if(listFile[i].getName().endsWith(pattern)) { |
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System.out.println(listFile[i].getPath()); |
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} |
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} |
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} |
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} |
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} |
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}</java> |
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} |
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=={{header|MAXScript}}== |
=={{header|MAXScript}}== |
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=={{header|Pop11}}== |
=={{header|Pop11}}== |
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Built-in procedure sys_file_match searches directories or directory |
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trees using shell-like patterns (three dots indicate search for |
trees using shell-like patterns (three dots indicate search for |
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subdirectory tree). |
subdirectory tree). |
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} |
} |
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Class ''RichFile'' gets a ''java.io.File'' in constructor. Its two methods |
Class ''RichFile'' gets a ''java.io.File'' in constructor. Its two methods return ''Iterable''s on items of type File. ''children'' allow iterations on the direct children (empty if file is not a directory). ''andTree'' contains a file and all files below, as a concatenation (''++'') of a sequence which contains only a file (''Seq.single'') and actual descendants. The method ''flatMap'' in Iterable takes a function argument which associates each item (''child'') to another Iterable (''andTree'' called recursively on that child) and returns the concatenation of those iterables. |
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The purpose of object ''RichFile'' is to publish implicit method ''toRichFile''. When this method is available in scope (after ''import RichFile.toRichFile'' or ''import RichFile._''), it is called behind the scene when a method of class ''RichFile'' is called on an instance of type File : with f of type File, code ''f.children'' (resp. ''f.andTree'') becomes ''toRichFile(f).children'' (resp. ''toRichFile(f).andTree''). It is as if class File had been added the methods of class RichFile. |
The purpose of the object ''RichFile'' is to publish the implicit method ''toRichFile''. When this method is available in scope (after ''import RichFile.toRichFile'' or ''import RichFile._''), it is called behind the scene when a method of class ''RichFile'' is called on an instance of type File : with f of type File, code ''f.children'' (resp. ''f.andTree'') becomes ''toRichFile(f).children'' (resp. ''toRichFile(f).andTree''). It is as if class File had been added the methods of class RichFile. |
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Using it : |
Using it : |
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=={{header|Visual Basic .NET}}== |
=={{header|Visual Basic .NET}}== |
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'''Platform:''' [[.NET]] |
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This uses the OS pattern matching |
This uses the OS pattern matching |
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Next |
Next |
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End Sub |
End Sub |
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{{works with|Bourne Again SHell}} |
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=={{header|UnixPipes}}== |
=={{header|UnixPipes}}== |
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