fix: resolve relative input paths given on the command line (#14803)

Opening a model with a relative path, for example `orca-slicer ./some.3mf`,
failed with "Loading of a model file failed." and "The file does not contain
any geometry data.", while the same file opened by an absolute path or by
drag and drop worked.

GUI_App::init_app_config() changes the working directory to <data_dir>/log,
and it runs from the GUI_App constructor because the app config is needed
early for instance checking. The input files are opened much later, in
post_init(), so a path still relative at that point resolved against the log
directory instead of the directory OrcaSlicer was started from, and the 3MF
reader failed to open it.

Resolve the input paths in CLI::setup(), which runs before GUI_App is
constructed and therefore before the working directory moves. Absolute paths
are returned unchanged, so the forms that open today are unaffected, and
custom open protocol URLs are passed through since post_init() hands those to
the downloader rather than the file loader.

The working directory change is left alone. It was added in #3248 so the TUTK
logs land in the data directory instead of the working directory (#3209).

tests/libslic3r/test_utils.cpp

@@ -4,6 +4,8 @@
 
 #include "test_utils.hpp"
 
+#include <boost/filesystem.hpp>
+
 #include <algorithm>
 #include <cctype>
 #include <fstream>
@@ -88,3 +90,65 @@ TEST_CASE("copy_file reports the OS error when the destination cannot be written
     REQUIRE(std::all_of(code.begin(), code.end(), [](unsigned char c) { return std::isdigit(c) != 0; }));
 #endif // _WIN32
 }
+
+TEST_CASE("A resolved input path still names the same file after the working directory changes", "[utils]") {
+    ScopedTemporaryFile model(".3mf");
+    { std::ofstream out(model.string()); out << "3mf"; }
+    const std::string name = model.path().filename().string();
+
+    // Resolve the bare name from the directory holding the file, then move away from it. The guard
+    // restores the directory the test started in, wherever this leaves it.
+    ScopedWorkingDirectory cwd(model.path().parent_path());
+    const std::string resolved = resolve_cli_input_path(name);
+    boost::filesystem::current_path(boost::filesystem::path(TEST_DATA_DIR));
+
+    REQUIRE(boost::filesystem::exists(resolved));
+    REQUIRE(boost::filesystem::equivalent(resolved, model.path()));
+    // Control: the bare name finds nothing from here, so resolving it this late would have failed.
+    REQUIRE_FALSE(boost::filesystem::exists(name));
+}
+
+TEST_CASE("resolve_cli_input_path completes a relative path against the working directory", "[utils]") {
+    ScopedWorkingDirectory cwd(boost::filesystem::temp_directory_path());
+    // Read back rather than reusing temp_directory_path(): changing to it resolves any symlink.
+    const boost::filesystem::path here = boost::filesystem::current_path();
+
+    SECTION("a bare name") {
+        REQUIRE(resolve_cli_input_path("model.3mf") == (here / "model.3mf").make_preferred().string());
+    }
+    SECTION("a ./ prefix is dropped") {
+        REQUIRE(resolve_cli_input_path("./model.3mf") == (here / "model.3mf").make_preferred().string());
+    }
+    SECTION("a ../ traversal is collapsed") {
+        REQUIRE(resolve_cli_input_path("../model.3mf") == (here.parent_path() / "model.3mf").make_preferred().string());
+    }
+}
+
+TEST_CASE("resolve_cli_input_path leaves inputs that must not be completed unchanged", "[utils]") {
+    SECTION("an absolute path") {
+        const boost::filesystem::path absolute = (boost::filesystem::temp_directory_path() / "model.3mf").make_preferred();
+        REQUIRE(resolve_cli_input_path(absolute.string()) == absolute.string());
+    }
+#ifdef _WIN32
+    // Every absolute form Windows accepts opens today, so each must come back byte for byte:
+    // normalizing them would rewrite the forward slashes and rebuild the \\?\ and UNC prefixes.
+    SECTION("an absolute Windows path of any form") {
+        for (const std::string absolute : {R"(C:\models\model.3mf)",
+                                           R"(C:/models/model.3mf)",
+                                           R"(\\server\share\model.3mf)",
+                                           R"(\\?\C:\models\model.3mf)"})
+            REQUIRE(resolve_cli_input_path(absolute) == absolute);
+    }
+#endif
+    // These are downloaded rather than opened, and completing one would produce a path, not a URL.
+    SECTION("a custom open protocol URL") {
+        for (const std::string url : {"orcaslicer://open/?file=https://example.com/model.3mf",
+                                      "prusaslicer://open/?file=https://example.com/model.3mf",
+                                      "bambustudio://open/?file=https://example.com/model.3mf",
+                                      "cura://open/?file=https://example.com/model.3mf"})
+            REQUIRE(resolve_cli_input_path(url) == url);
+    }
+    SECTION("an empty argument") {
+        REQUIRE(resolve_cli_input_path("").empty());
+    }
+}

tests/test_utils.hpp

@@ -176,4 +176,22 @@ inline void write_debug_stream([[maybe_unused]] const std::string &name, [[maybe
 #endif
 }
 
+// Changes the working directory and restores the previous one on scope exit, including when an
+// assertion throws. It is process wide state shared with every other test.
+class ScopedWorkingDirectory
+{
+public:
+    explicit ScopedWorkingDirectory(const boost::filesystem::path &dir)
+        : m_previous(boost::filesystem::current_path())
+    {
+        boost::filesystem::current_path(dir);
+    }
+    ~ScopedWorkingDirectory() { boost::system::error_code ec; boost::filesystem::current_path(m_previous, ec); }
+    ScopedWorkingDirectory(const ScopedWorkingDirectory &) = delete;
+    ScopedWorkingDirectory &operator=(const ScopedWorkingDirectory &) = delete;
+
+private:
+    boost::filesystem::path m_previous;
+};
+
 #endif // SLIC3R_TEST_UTILS