Command update [year/day] fails if no year folder exists in root

[xKirtle]

I was trying to make use of this AOC framework to solve AOC challenges myself, but it seems to break if no year folder exists

execute, for example, dotnet run update 2021/1

Updating https://adventofcode.com/2021/day/1
Unhandled exception. System.AggregateException: One or more errors occurred. (Sequence contains no elements)
 ---> System.InvalidOperationException: Sequence contains no elements
   at System.Linq.ThrowHelper.ThrowNoElementsException()
   at System.Linq.Enumerable.MinInteger[T](IEnumerable`1 source)
   at AdventOfCode.Updater.Update(Int32 year, Int32 day) in ...RepoPath...\Lib\Updater.cs:line 52
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at Program.<>c__DisplayClass0_1.<<Main>$>b__16() in ...RepoPath...\App.cs:line 17
   at Program.<Main>$(String[] args) in ...RepoPath...\App.cs:line 111

In Updater.Update():

...
var years = Assembly.GetEntryAssembly().GetTypes()
    .Where(t => t.GetTypeInfo().IsClass && typeof(Solver).IsAssignableFrom(t))
    .Select(tsolver => SolverExtensions.Year(tsolver));

UpdateProjectReadme(years.Min(), years.Max());
...

the Enumerable years variable seems to be empty and it breaks when attempting to get the Min() and Max() of the collection.

I think something like this would solve the issue:

...
var years = Assembly.GetEntryAssembly().GetTypes()
    .Where(t => t.GetTypeInfo().IsClass && typeof(Solver).IsAssignableFrom(t))
    .Select(tsolver => SolverExtensions.Year(tsolver));

if (years.Count() == 0) {
    years = new int[] { year };
}

UpdateProjectReadme(years.Min(), years.Max());
...

[encse]

@xKirtle sorry I’m waiting for a less demanding day but will check your PR. I hope you are not blocked

[encse]

Merged, thanks.