Add a repl script handling framework

This commit is contained in:
Tim Van Baak 2024-08-16 14:39:13 -07:00
parent 6bb6c0695f
commit 7ad6f3a3d3
3 changed files with 110 additions and 1 deletions

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@ -1,12 +1,84 @@
using CommandLine; using CommandLine;
using MultiversalDiplomacy.Script;
namespace MultiversalDiplomacy.CommandLine; namespace MultiversalDiplomacy.CommandLine;
[Verb("repl", HelpText = "Begin an interactive 5dplomacy session.")] [Verb("repl", HelpText = "Begin an interactive 5dplomacy session.")]
public class ReplOptions public class ReplOptions
{ {
[Option('i', "input", HelpText = "Begin the repl session by executing the commands in this file.")]
public string? InputFile { get; set; }
[Option('o', "output", HelpText = "Echo the repl session to this file. Specify a directory to autogenerate a filename.")]
public string? OutputFile { get; set; }
public static void Execute(ReplOptions args) public static void Execute(ReplOptions args)
{ {
throw new NotImplementedException(); IEnumerable<string>? inputFileLines = null;
if (args.InputFile is not null) {
var fullPath = Path.GetFullPath(args.InputFile);
inputFileLines = File.ReadAllLines(fullPath);
Console.WriteLine($"Reading from {fullPath}");
}
// Create a writer to the output file, if specified.
StreamWriter? outputWriter = null;
if (args.OutputFile is not null)
{
string fullPath = Path.GetFullPath(args.OutputFile);
string outputPath = Directory.Exists(fullPath)
? Path.Combine(fullPath, $"{DateTime.UtcNow:yyyyMMddHHmmss}.log")
: fullPath;
Console.WriteLine($"Echoing to {outputPath}");
outputWriter = File.CreateText(outputPath);
}
IEnumerable<string?> GetInputs()
{
foreach (string line in inputFileLines ?? [])
{
var trimmed = line.Trim();
// File inputs weren't echoed to the terminal so they need to be echoed here
Console.WriteLine($"{trimmed}");
yield return trimmed;
}
string? input;
do
{
input = Console.ReadLine();
yield return input;
}
while (input is not null);
// The last null is returned because an EOF means we should quit the repl.
}
IScriptHandler? handler = new ReplScriptHandler();
Console.Write(handler.Prompt);
foreach (string? nextInput in GetInputs())
{
// Handle quitting directly.
if (nextInput is null || nextInput == "quit" || nextInput == "exit")
{
break;
}
string input = nextInput.Trim();
outputWriter?.WriteLine(input);
outputWriter?.Flush();
// Delegate all other command parsing to the handler.
handler = handler.HandleInput(input);
// Quit if the handler ends processing, otherwise prompt for the next command.
if (handler is null)
{
break;
}
Console.Write(handler.Prompt);
}
Console.WriteLine("exiting");
} }
} }

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@ -0,0 +1,21 @@
namespace MultiversalDiplomacy.Script;
/// <summary>
/// A handler that interprets and executes 5dp script commands. Script handlers may create additional script handlers
/// and delegate handling to them, allowing a sort of recursive parsing of script commands.
/// </summary>
public interface IScriptHandler
{
/// <summary>
/// When used interactively, the prompt that should be displayed.
/// </summary>
public string Prompt { get; }
/// <summary>
/// Process a line of input.
/// </summary>
/// <returns>
/// The handler that should handle the next line of input, or null if script handling should end.
/// </returns>
public IScriptHandler? HandleInput(string input);
}

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namespace MultiversalDiplomacy.Script;
/// <summary>
/// A script handler for the interactive repl.
/// </summary>
public class ReplScriptHandler : IScriptHandler
{
public string Prompt => "5dp> ";
public IScriptHandler? HandleInput(string input)
{
Console.WriteLine($"[{input}]");
return this;
}
}