From 6d400502297d3adfb505a60f391a9b44fccc05b2 Mon Sep 17 00:00:00 2001
From: Martin Ashby <martin@ashbysoft.com>
Date: Mon, 11 Sep 2023 18:46:57 +0100
Subject: Add run

---
 src/main.zig | 75 +++++++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 52 insertions(+), 23 deletions(-)

(limited to 'src/main.zig')

diff --git a/src/main.zig b/src/main.zig
index 773dad8..fd2aa5c 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -114,33 +114,56 @@ pub fn main() !void {
 
 
     // Download all the required files
-    var root_dir = try get_minecraft_root_dir(allocator);
-    defer root_dir.close();
-    try download_version(allocator, &client, &root_dir, release_version);
-    // std.mem.replace(comptime T: type, input: []const T, needle: []const T, replacement: []const T, output: []T)
-
-    // check the latest.release
-    // find that in the versions[] by key id
-    // get the download URL for that https://piston-meta.mojang.com/v1/packages/1f376e6cb981265af345076889f9ef325bb6b9e8/1.20.1.json
-
-    // get arguments.game and arguments.jvm ready to supply ...
-    // probably just use the system java version for now
-    //
+    var root_dir_path = try get_minecraft_root_dir(allocator);
+    defer allocator.free(root_dir_path);
+    // try download_version(allocator, &client, root_dir_path, release_version);
+    try play_version(allocator, root_dir_path, release_version);
 }
 
-fn download_version(allocator: std.mem.Allocator, client: *HttpClient, root_dir: *const std.fs.Dir, version: Version) !void {
-    const dir_path = try std.fs.path.join(allocator, &[_][]const u8{"versions", version.id});
+fn play_version(allocator: std.mem.Allocator, root_dir_path: []const u8, version: Version) !void {
+    // version dir
+    const dir_path = try version.dir_path(allocator, root_dir_path);
     defer allocator.free(dir_path);
+    var dir = try std.fs.openDirAbsolute(dir_path, .{});
+    defer dir.close();
+    var cmd_buf = std.ArrayList([]const u8).init(allocator);
+    try cmd_buf.append("java");
+    try cmd_buf.append("-cp");
+    try cmd_buf.append("*");
+    // try cmd_buf.append(version.mainClass);
+    try cmd_buf.append("net.minecraft.client.main.Main");
+    try cmd_buf.append("-accessToken=foo");
+    try cmd_buf.append("-version=1.20.1");
+    const cmd = try cmd_buf.toOwnedSlice(); 
+    defer allocator.free(cmd);
+    const cmd_log = try std.mem.join(allocator, " ", cmd);
+    defer allocator.free(cmd_log);
+    log.info("running minecraft cmd [{s}] in cwd {s}", .{cmd_log, dir_path});
+    var proc = std.ChildProcess.init(cmd, allocator);
+    proc.stdin_behavior = .Ignore;
+    proc.cwd = dir_path;
+    proc.cwd_dir = null;
+    proc.env_map = null;
+    proc.expand_arg0 = .no_expand;
+    _ = try proc.spawnAndWait();
+}
+
+fn download_version(allocator: std.mem.Allocator, client: *HttpClient, root_dir_path: []const u8, version: Version) !void {
+    const dir_path = try version.dir_path(allocator, root_dir_path);
+    defer allocator.free(dir_path);
+    std.fs.makeDirAbsolute(dir_path) catch |e| switch (e) {
+        error.PathAlreadyExists => {}, // fine, swallow the error
+        else => return e,
+    };
     log.info("downloading version {s} to {s}", .{version.id, dir_path});
-    try root_dir.makePath(dir_path);
-    const dir = try root_dir.openDir(dir_path, .{});
+    const dir = try std.fs.openDirAbsolute(dir_path, .{});
     var client_jar = try dir.createFile("client.jar", .{});
     defer client_jar.close();
     try download_file(client, &client_jar, version.downloads.client.url);
 
     var client_map = try dir.createFile("client.map", .{});
     defer client_map.close();
-    try download_file(client, &client_jar, version.downloads.client_mappings.url);
+    try download_file(client, &client_map, version.downloads.client_mappings.url);
     // TODO server
 
     // Dependencies... 
@@ -334,6 +357,11 @@ const Version = struct {
     releaseTime: []const u8,
     time: []const u8,
     type: []const u8,
+
+    /// Caller must free the result
+    fn dir_path(self: Version, allocator: std.mem.Allocator, root_dir_path: []const u8) ![]const u8 {
+        return try std.fs.path.join(allocator, &[_][]const u8{root_dir_path, "versions", self.id});
+    }
 };
 
 
@@ -360,20 +388,21 @@ fn download_json(client: *HttpClient, comptime T: type, url: []const u8) !std.js
     return res;
 }
 
-fn get_minecraft_root_dir(allocator: std.mem.Allocator) !std.fs.Dir {
+/// Root of minecraft data directory. 
+/// Calling ensures the directory exists.
+/// Caller owns the result and must free it
+fn get_minecraft_root_dir(allocator: std.mem.Allocator) ![]const u8 {
     const home_dir = std.os.getenv("HOME") orelse {
         return error.AppDataDirUnavailable;
     };
     const root_dir_path = try std.fs.path.join(allocator, &[_][]const u8{home_dir, ".minecraft"});
-    defer allocator.free(root_dir_path);
-    const root_dir = std.fs.openDirAbsolute(root_dir_path, .{}) catch |e| switch (e) {
-        error.FileNotFound => blk: {
+    _ = std.fs.openDirAbsolute(root_dir_path, .{}) catch |e| switch (e) {
+        error.FileNotFound => {
             try std.fs.makeDirAbsolute(root_dir_path);
-            break :blk try std.fs.openDirAbsolute(root_dir_path, .{});
         },
         else => return e,
     };
-    return root_dir;
+    return root_dir_path;
 }
 
 test "heterogenous array" {
-- 
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