fix(build): correct misleading CMake error detection and improve project root handling

Author: GaspardKirira

src/commands/BuildCommand.cpp

@@ -792,18 +792,30 @@ namespace vix::commands::BuildCommand
     {
       fs::path base = cwd;
       if (!opt.dir.empty())
-        base = fs::path(opt.dir);
+        base = fs::absolute(fs::path(opt.dir));
 
+      fs::path projectDir;
       const auto root = util::find_project_root(base);
-      if (!root)
+
+      if (root)
+      {
+        projectDir = *root;
+      }
+      else if (util::file_exists(base / "CMakeLists.txt"))
+      {
+        projectDir = base;
+      }
+      else
+      {
         return std::nullopt;
+      }
 
       const auto presetOpt = resolve_preset(opt.preset);
       if (!presetOpt)
         return std::nullopt;
 
       process::Plan plan;
-      plan.projectDir = *root;
+      plan.projectDir = fs::absolute(projectDir);
       plan.preset = *presetOpt;
 
       plan.launcher = detect_launcher(opt);
@@ -824,8 +836,10 @@ namespace vix::commands::BuildCommand
 
       std::string toolchainContent;
       if (!opt.targetTriple.empty())
+      {
         toolchainContent =
             build::toolchain_contents_for_triple(opt.targetTriple, opt.sysroot);
+      }
 
       plan.cmakeVars = build_cmake_vars(
           plan.preset,

src/errors/build/CMakeBuildErrors.cpp

@@ -201,22 +201,37 @@ namespace vix::cli::errors::build
 
     bool handleMissingCMakeLists(std::string_view log)
     {
-      if (!contains(log, "CMakeLists.txt") ||
-          (!contains(log, "does not exist") &&
-           !contains(log, "not found") &&
-           !contains(log, "Cannot find")))
+      const bool missingSourceDirCMakeLists =
+          contains(log, "The source directory") &&
+          contains(log, "does not appear to contain CMakeLists.txt");
+
+      const bool missingExplicitCMakeLists =
+          contains(log, "CMake Error: The source directory") &&
+          contains(log, "CMakeLists.txt");
+
+      const bool missingPathCMakeLists =
+          contains(log, "Source directory") &&
+          contains(log, "does not exist") &&
+          contains(log, "CMakeLists.txt");
+
+      if (!missingSourceDirCMakeLists &&
+          !missingExplicitCMakeLists &&
+          !missingPathCMakeLists)
       {
         return false;
       }
 
       const std::string path = extract(
           log,
-          std::regex(R"re(source directory\s+"([^"]+)")re"));
+          std::regex(R"re((?:The source directory|Source directory)\s+"([^"]+)")re"));
 
       error("CMake configure failed: CMakeLists.txt not found.");
-      printField("directory: ", path);
-      hint("Make sure you are running cmake from the correct directory.");
-      hint("Expected a CMakeLists.txt at the root of the project.");
+
+      if (!path.empty())
+        printField("directory: ", path);
+
+      hint("Check the source directory passed to CMake.");
+      hint("Run with --verbose to inspect the full configure command.");
       return true;
     }