fromFile

import std.exception : assertThrown;
import std.file : exists, remove;
import std.stdio : File;
struct TestStruct {
	string a;
}
//Write some example files...
File("int.yml", "w").write("---\n9");
File("string.json", "w").write(`"test"`);
File("struct.yml", "w").write("---\na: b");
scope(exit) { //Clean up when done
	if ("int.yml".exists) {
		remove("int.yml");
	}
	if ("string.json".exists) {
		remove("string.json");
	}
	if ("struct.yml".exists) {
		remove("struct.yml");
	}
}
//Read examples from respective files
assert(fromFile!(uint, YAML)("int.yml") == 9);
assert(fromFile!(string, JSON)("string.json") == "test");
assert(fromFile!(TestStruct, YAML)("struct.yml") == TestStruct("b"));
//Read examples from respective files using automatic format detection
assert(fromFile!uint("int.yml") == 9);
assert(fromFile!string("string.json") == "test");
assert(fromFile!TestStruct("struct.yml") == TestStruct("b"));

assertThrown("file.obviouslybadextension".fromFile!uint);