On Tuesday, 18 March 2014 at 23:10:05 UTC, Chris Williams wrote:
Annoying that formatting the string is required. I think you're
right that it's ignoring my alias parameter because I'm not
using it. Formatting doesn't accomplish anything except to use
the parameter. But in exchange, you have to relate your format
arguments to the %s entries, instead of the q{} contents just
being code.
import fs = std.file;
import std.stdio;
import std.string: format;
template gotoPath(alias path) {
enum gotoPath = format(q{
string currPath = fs.getcwd();
scope (exit) fs.chdir(currPath);
fs.chdir(%s);
}, __traits(identifier, path));
}
void doStuff(string targetDirectory) {
mixin(gotoPath!(targetDirectory));
writefln("b %s", fs.getcwd());
}
void main() {
writefln("a %s", fs.getcwd());
doStuff("/etc");
writefln("c %s", fs.getcwd());
}
I feel like there might be a misunderstanding. It's not that the
parameter was ignored because it wasn't used. You're not giving
the compiler a little extra help.
You're building a string from the parameter. __traits(identifier,
path) isn't "path", it's "targetDirectory" (in this specific
instantiation).
