help: allow launching the game with a one-off gk executable (#570)

Fixes #267 

This is something I've had to manually get users to do multiple times to
see if a fix has worked in the C++ code. This should make that much
easier.

Still requires some cleanup / OS specific handling.

src-tauri/src/commands/binaries.rs

@@ -1,8 +1,11 @@
+#[cfg(target_os = "windows")]
+use std::os::windows::process::CommandExt;
 use std::{
   collections::HashMap,
   io::ErrorKind,
   path::{Path, PathBuf},
   process::Stdio,
+  str::FromStr,
   time::Instant,
 };
 use tokio::{io::AsyncWriteExt, process::Command};
@@ -591,7 +594,7 @@ pub async fn open_repl(
   let mut command;
   #[cfg(windows)]
   {
-    command = Command::new("cmd");
+    command = std::process::Command::new("cmd");
     command
       .args([
         "/K",
@@ -605,14 +608,14 @@ pub async fn open_repl(
   }
   #[cfg(target_os = "linux")]
   {
-    command = Command::new("xdg-terminal-exec");
+    command = std::process::Command::new("xdg-terminal-exec");
     command
       .args(["./goalc", "--proj-path", &data_folder.to_string_lossy()])
       .current_dir(exec_info.executable_dir);
   }
   #[cfg(target_os = "macos")]
   {
-    command = Command::new("osascript");
+    command = std::process::Command::new("osascript");
     command
       .args([
         "-e",
@@ -794,18 +797,44 @@ pub async fn launch_game(
   app_handle: tauri::AppHandle,
   game_name: String,
   in_debug: bool,
+  executable_location: Option<String>,
 ) -> Result<(), CommandError> {
   let config_lock = config.lock().await;
   let config_info = common_prelude(&config_lock)?;
 
-  let exec_info = get_exec_location(&config_info, "gk")?;
+  let mut exec_info = get_exec_location(&config_info, "gk")?;
+  if let Some(custom_exec_location) = executable_location {
+    match PathBuf::from_str(custom_exec_location.as_str()) {
+      Ok(exec_path) => {
+        let path_copy = exec_path.clone();
+        if path_copy.parent().is_none() {
+          return Err(CommandError::BinaryExecution(format!(
+            "Failed to resolve custom binary parent directory"
+          )));
+        }
+        exec_info = ExecutableLocation {
+          executable_dir: exec_path.clone().parent().unwrap().to_path_buf(),
+          executable_path: exec_path.clone(),
+        };
+      }
+      Err(err) => {
+        return Err(CommandError::BinaryExecution(format!(
+          "Failed to resolve custom binary location {}",
+          err
+        )));
+      }
+    }
+  }
+
   let args = generate_launch_game_string(&config_info, game_name.clone(), in_debug, false)?;
 
   log::info!(
-    "Launching game version {:?} -> {:?} with args: {:?}",
+    "Launching game version {:?} -> {:?} with args: {:?}. Working Directory: {:?}, Path: {:?}",
     &config_info.active_version,
     &config_info.tooling_version,
-    args
+    args,
+    exec_info.executable_dir,
+    exec_info.executable_path,
   );
 
   let log_file = create_std_log_file(&app_handle, format!("game-{game_name}.log"), false)?;

src/components/games/GameControls.svelte

@@ -16,7 +16,12 @@
   } from "flowbite-svelte";
   import { resetGameSettings, uninstallGame } from "$lib/rpc/game";
   import { platform } from "@tauri-apps/api/os";
-  import { getLaunchGameString, launchGame, openREPL } from "$lib/rpc/binaries";
+  import {
+    getLaunchGameString,
+    launchGame,
+    launchGameWithCustomExecutable,
+    openREPL,
+  } from "$lib/rpc/binaries";
   import {
     doesActiveToolingVersionMeetMinimum,
     getInstallationDirectory,
@@ -165,6 +170,11 @@
           launchGame(getInternalName(activeGame), true);
         }}>{$_("gameControls_button_playInDebug")}</DropdownItem
       >
+      <DropdownItem
+        on:click={async () => {
+          launchGameWithCustomExecutable(getInternalName(activeGame));
+        }}>Launch with Custom Executable</DropdownItem
+      >
       <DropdownItem
         on:click={async () => {
           openREPL(getInternalName(activeGame));

src/lib/rpc/binaries.ts

@@ -1,3 +1,4 @@
+import { filePrompt, filePromptNoFilters } from "$lib/utils/file-dialogs";
 import { invoke_rpc } from "./rpc";
 
 interface InstallationOutput {
@@ -66,12 +67,27 @@ export async function launchGame(
 ): Promise<void> {
   return await invoke_rpc(
     "launch_game",
-    { gameName, inDebug },
+    { gameName, inDebug, executableLocation: null },
     () => {},
     "_mirror_",
   );
 }
 
+export async function launchGameWithCustomExecutable(
+  gameName: string,
+): Promise<void> {
+  // Get custom executable location
+  const customExecutable = await filePromptNoFilters("Select custom 'gk'");
+  if (customExecutable !== null) {
+    return await invoke_rpc(
+      "launch_game",
+      { gameName, inDebug: false, executableLocation: customExecutable },
+      () => {},
+      "_mirror_",
+    );
+  }
+}
+
 export async function openREPL(gameName: string): Promise<void> {
   return await invoke_rpc(
     "open_repl",

src/lib/utils/file-dialogs.ts

@@ -1,5 +1,22 @@
 import { open, save } from "@tauri-apps/api/dialog";
 
+export async function filePromptNoFilters(
+  title: string,
+): Promise<string | null> {
+  const path = await open({
+    title: title,
+    multiple: false,
+    directory: false,
+    filters: undefined,
+  });
+
+  if (Array.isArray(path) || path === null) {
+    return null;
+  }
+
+  return path;
+}
+
 export async function filePrompt(
   extensions: string[],
   name: string,