Programming-Idioms

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Idiom #177 Find files with a given list of filename extensions

Construct a list L that contains all filenames that have the extension ".jpg" , ".jpeg" or ".png" in directory D and all it's subdirectories.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
string D = @"C:\The\Search\Path";

// Assumes that the file system is case insensitive
HashSet<string> exts = new HashSet<string>(StringComparer.CurrentCultureIgnoreCase) { "jpg", "jpeg", "png" };
IEnumerable<string> L =
Directory
    .EnumerateFiles(D, "*", SearchOption.AllDirectories)
    .Where(currentFile => exts.Contains(Path.GetExtension(currentFile)));
import std.algorithm;
import std.conv;
import std.file;
immutable exts = ["jpg", "jpeg", "png"];
auto L = D.dirEntries(SpanMode.depth)
          .map!(to!string)
          .filter!(f => exts.canFind(f.split(".")[$-1]));
import "path/filepath"
import "strings"
L := []string{}
err := filepath.Walk(D, func(path string, info os.FileInfo, err error) error {
	if err != nil {
		fmt.Printf("failure accessing a path %q: %v\n", path, err)
		return err
	}
	for _, ext := range []string{".jpg", ".jpeg", ".png"} {
		if strings.HasSuffix(path, ext) {
			L = append(L, path)
			break
		}
	}
	return nil
})
FileUtil
L := FindAllFiles(D, '*.jpg;*.jpeg;*.png', True);
use File::Find;
my @L;
find(sub {
  push @L, $File::Find::name
     if /(.jpg|.jpeg|.png)$/;
}, $D);


import glob
import itertools
list(itertools.chain(*(glob.glob("*/**.%s" % ext) for ext in ["jpg", "jpeg", "png"])))
import os
extensions = [".jpg", ".jpeg", ".png"]
L = [f for f in os.listdir(D) if os.path.splitext(f)[1] in extensions]
import re
import os
filtered_files = ["{}/{}".format(dirpath, filename) for dirpath, _, filenames in os.walk(D) for filename in filenames if re.match(r'^.*\.(?:jpg|jpeg|png)$', filename)]
L = Dir.glob(File.join("**", "*.{jpg,jpeg,png}"), base: D)

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Idiom created by

Bart