fix(config): escape project index json

Author: Sunrisepeak

CHANGELOG.md

@@ -3,6 +3,13 @@
 > 本文件追踪 `mcpp-community/mcpp` 公开仓的版本演进。
 > 格式参考 [Keep a Changelog](https://keepachangelog.com/zh-CN/1.1.0/)。
 
+## [0.0.32] — 2026-05-30
+
+### 修复
+
+- 修复 project-local `.xlings.json` 生成时未转义 JSON 字符串的问题,
+  避免 Windows 本地 index 路径中的反斜杠导致 xlings 跳过项目索引。
+
 ## [0.0.31] — 2026-05-30
 
 ### 修复

mcpp.toml

@@ -1,6 +1,6 @@
 [package]
 name        = "mcpp"
-version     = "0.0.31"
+version     = "0.0.32"
 description = "Modern C++ build & package management tool"
 license     = "Apache-2.0"
 authors     = ["mcpp-community"]

src/config.cppm

@@ -666,7 +666,7 @@ bool ensure_project_index_dir(
         if (spec.is_builtin()) continue;
         if (spec.is_local()) {
             auto source = resolve_project_index_path(projectDir, spec);
-            customRepos.emplace_back(name, source.string());
+            customRepos.emplace_back(name, source.generic_string());
             continue;
         }
         customRepos.emplace_back(name, spec.url);

src/xlings.cppm

@@ -276,6 +276,29 @@ void write_file(const std::filesystem::path& p, std::string_view content) {
     os << content;
 }
 
+std::string json_escape(std::string_view value) {
+    std::string out;
+    out.reserve(value.size());
+    for (unsigned char ch : value) {
+        switch (ch) {
+            case '"':  out += "\\\""; break;
+            case '\\': out += "\\\\"; break;
+            case '\b': out += "\\b";  break;
+            case '\f': out += "\\f";  break;
+            case '\n': out += "\\n";  break;
+            case '\r': out += "\\r";  break;
+            case '\t': out += "\\t";  break;
+            default:
+                if (ch < 0x20) {
+                    out += std::format("\\u{:04x}", static_cast<unsigned>(ch));
+                } else {
+                    out.push_back(static_cast<char>(ch));
+                }
+        }
+    }
+    return out;
+}
+
 // LineScan: cheap field extraction for bootstrap install progress lines.
 // Handles flat JSON; no nested array/object — the keys we extract are
 // all leaves.
@@ -794,12 +817,13 @@ void seed_xlings_json(const Env& env,
     json += "  \"index_repos\": [\n";
     for (std::size_t i = 0; i < repos.size(); ++i) {
         json += std::format("    {{ \"name\": \"{}\", \"url\": \"{}\" }}{}\n",
-                            repos[i].first, repos[i].second,
+                            json_escape(repos[i].first),
+                            json_escape(repos[i].second),
                             i + 1 == repos.size() ? "" : ",");
     }
     json += "  ],\n";
     json += "  \"lang\": \"en\",\n";
-    json += std::format("  \"mirror\": \"{}\"\n", mirror);
+    json += std::format("  \"mirror\": \"{}\"\n", json_escape(mirror));
     json += "}\n";
     write_file(path, json);
 }

tests/unit/test_config.cpp

@@ -47,3 +47,39 @@ TEST(Config, ResolveProjectIndexPathUsesProjectRootForRelativeLocalIndex) {
     EXPECT_EQ(mcpp::config::resolve_project_index_path(project, spec),
               (project / "mcpp").lexically_normal());
 }
+
+TEST(Config, ProjectIndexJsonEscapesLocalIndexPath) {
+    auto project = make_tempdir("mcpp-config-json-escape");
+    auto index = project / "local" / "index";
+    std::filesystem::create_directories(index / "pkgs");
+
+    mcpp::pm::IndexSpec local;
+    local.name = "local\"dev";
+    local.path = index;
+
+    mcpp::pm::IndexSpec remote;
+    remote.name = "remote";
+    remote.url = R"(https://example.com/a\b"c)";
+
+    std::map<std::string, mcpp::pm::IndexSpec> indices;
+    indices.emplace(local.name, local);
+    indices.emplace(remote.name, remote);
+
+    mcpp::config::GlobalConfig cfg;
+    ASSERT_TRUE(mcpp::config::ensure_project_index_dir(cfg, project, indices));
+
+    std::ifstream is(project / ".mcpp" / ".xlings.json");
+    ASSERT_TRUE(is);
+    std::stringstream ss;
+    ss << is.rdbuf();
+    auto content = ss.str();
+
+    EXPECT_NE(content.find(R"("name": "local\"dev")"), std::string::npos)
+        << content;
+    EXPECT_NE(content.find(index.generic_string()), std::string::npos)
+        << content;
+    EXPECT_NE(content.find(R"(https://example.com/a\\b\"c)"), std::string::npos)
+        << content;
+
+    std::filesystem::remove_all(project);
+}