Re: Coping files and folders

[Joel]

Brilliant! Thanks.

I think the silent one has errors. But I've used the first 
function in my program now. With mine, strait after doing the 
copying is was supposed then update a file, but didn't. Your one 
seems to work though.

On Thursday, 24 January 2013 at 08:58:06 UTC, monarch_dodra wrote:
On Thursday, 24 January 2013 at 07:41:23 UTC, Jacob Carlborg 
wrote:
On 2013-01-24 07:28, Joel wrote:
How does one copy folders (with files in them) including sub 
folders,
and creating any needed folders?

Like:
land\house\cat.d
land\house\rat.exe
land\house\bedroom\ants.txt

to
root\island\house\cat.d
root\island\house\rat.exe
root\island\house\bedroom\ants.txt

One work around is to use 'system' (under std.process).

I don't think Phobos currently has any functions for this. 
Someone posted code in these newsgroups of a parallel 
implementation of copy and remove.

Mustn't be very hard to manually write "copyDir".

The problem with "copyDir" is its transactional behavior: What 
should it do in case of a failure mid copy? Bail? Cleanup? 
Continue?

Anyways, I just threw this together. The first version bails on 
first error.
The second version keeps going as much as it can, and returns 
true on success.

The caller is then free to (or not to) call rmdirRecurse in 
case of failure.

//Throws exception on first error.
void copyDir(string inDir, string outDir)
{
    if (!exists(outDir))
        mkdir(outDir);
    else
        if (!isDir(outDir))
            throw new FileException(format("Destination path %s 
is not a folder.", outDir));

    foreach (entry; dirEntries(inDir.idup, SpanMode.shallow))
    {
        auto fileName = baseName(entry.name);
        auto destName = buildPath(outDir, fileName);
        if (entry.isDir())
            copyDir(entry.name, destName);
        else
            copy(entry.name, destName);
    }
}

//Silently keeps going as much as it can, then returns true on 
success,
//or false if an error occured.
bool copyDirSilent(string inDir, string outDir)
{
    if (!exists(outDir))
    {
        auto e = collectException(mkdir(outDir));
        if (e !is null)
            return false;
    }
    else
        if (!isDir(outDir))
            return false;

    foreach (entry; dirEntries(inDir, SpanMode.shallow))
    {
        auto fileName = baseName(entry.name);
        auto destName = buildPath(outDir, fileName);
        if (entry.isDir())
        {
            bool b = copyDirSilent(entry.name, destName);
            if (b == false)
                return false;
        }
        else
        {
            auto e = collectException(mkdir(outDir));
            if (e !is null)
                return false;
        }
    }
    return true;
}