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open System | |
open System.IO | |
open System.Collections.Generic | |
open System.Security.Cryptography | |
type CommandLineOptions = { | |
startkatalog : DirectoryInfo | |
minFilStorrelseIBytes : int64 | |
} | |
let filesInDirectory (dir:DirectoryInfo) = | |
try | |
// Kaster exception dersom ingen tilgang | |
dir.EnumerateFiles() | |
with | |
| _ -> | |
printfn "Ingen tilgang til %s" dir.FullName | |
// Ignorerer kataloger uten tilgang | |
Seq.empty | |
let directoriesInDirectory (dir:DirectoryInfo) = | |
try | |
dir.EnumerateDirectories() | |
with | |
| _ -> Seq.empty // Ignorerer kataloger uten tilgang. dette er logget ifm enumerering av filer | |
let rec filer dir = | |
seq { yield! filesInDirectory dir | |
yield! directoriesInDirectory dir |> Seq.collect filer } | |
let lagHash (fil:FileInfo) = | |
use sha256 = SHA256.Create() | |
try | |
// Kaster exception dersom vi ikke har lesetilgang til filen | |
use stream = fil.OpenRead() | |
let hash = sha256.ComputeHash stream | |
Some (Convert.ToBase64String(hash)) | |
with | |
| _ -> None | |
// Her lagrer vi informasjon om filene vi har lest. Nøkkel er en hash av filen, verdien er fullt filnavn | |
let filLager = Dictionary<string, string>() | |
let finnDuplikat fil = | |
let hashOption = lagHash fil | |
match hashOption with | |
| Some hash -> | |
if (filLager.ContainsKey(hash)) then | |
printfn "Original fil: %s" filLager.[hash] | |
printfn "Duplikat fil: %s" fil.FullName | |
printfn "" | |
else | |
filLager.Add(hash, fil.FullName) | |
| None -> printfn "Ingen tilgang til %s" fil.FullName | |
let PrintDuplikater options = | |
filer options.startkatalog | |
|> Seq.filter (fun fil -> fil.Length >= options.minFilStorrelseIBytes) | |
|> Seq.iter (fun fil -> finnDuplikat fil) | |
let parseCommandLineOptions (args: string[]) = | |
match args with | |
| [|bytes; katalog|] -> | |
let isLong, minFilStorrelseIBytes = Int64.TryParse(bytes) | |
let katalogEksisterer = Directory.Exists katalog | |
if isLong && katalogEksisterer then | |
Some { | |
startkatalog = DirectoryInfo(katalog) | |
minFilStorrelseIBytes = minFilStorrelseIBytes | |
} | |
else | |
None | |
| _ -> None | |
[<EntryPoint>] | |
let Main(args) = | |
let commandLineOptions = parseCommandLineOptions args | |
match commandLineOptions with | |
| Some options -> | |
PrintDuplikater options | |
0 | |
| None -> | |
// Enkel feilmelding ved feil bruk | |
printfn "Kalles fx. slik: %s 100000 C:\\Temp\\" (Environment.GetCommandLineArgs()).[0] | |
-1 |
Andre implementasjoner:
- Erlend Wiig: https://gist.github.com/Erlord/1687483171981f6a120f
- Kristian Hellang: https://gist.github.com/khellang/3a1a49744f6825b6f401
- Tomas Jansson: https://gist.github.com/mastoj/83b0e0188fcec69cd3fb
- Bjørn Einar Bjartnes: https://gist.github.com/bjartwolf/d4d83eda3c2f18bf3ce7
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Problemet som skulle løses var å liste ut duplikate filer i en katalog, inkludert underkataloger. Bare filer over en gitt størrelse skal sjekkes. Programmet skal kunne kompileres uten noe tillegg, og ved kjøring skal skikkelige feilmeldinger ved feil bruk av programmet.
Spesielle utfordringer:
Designvalg: