How do I iteratively replace lines in a file?

[Andrej Mitrovic]

Yeah, I've already done exactly as you guys proposed. Note however
that `inputfile` and `outputfile` should be declared inside the
foreach loop. Either that or you have to call `close()` explicitly. If
you don't do that, file handles don't get released, and you'll
eventually get back a stdio error such as "too many file handles
opened". You could loose files this way. I know this because it just
happened yesterday while testing. :p

Anywho, I needed a quick script to append a semicolon to import lines
because I managed to screw up some files when using sed to replace
some lines. It's a quick hack but worked for me:

import std.stdio;
import std.file;
import std.stdio;
import std.path;
import std.string;

void main()
{
    File inputfile;
    File outputfile;
    string newname;

    foreach (string name; dirEntries(r".", SpanMode.breadth))
    {
        if (!(isFile(name) && getExt(name) == "d"))
        {
            continue;
        }

        newname = name.idup ~ "backup";
        if (exists(newname))
        {
            remove(newname);
        }

        rename(name, newname);

        inputfile = File(newname, "r");
        outputfile = File(name, "w");

        foreach (line; inputfile.byLine)
        {
            if ((line.startsWith("private import") ||
line.startsWith("import")) &&
                !line.endsWith(",") &&
                !line.endsWith(";"))
            {
                outputfile.writeln(line ~ ";");
            }
            else
            {
                outputfile.writeln(line);
            }
        }

        inputfile.close();
        outputfile.close();
    }

    foreach (string name; dirEntries(r".", SpanMode.breadth))
    {
        if (getExt(name) == "dbackup")
        {
            remove(name);
        }
    }
}