base impl

Author: Sunrisepeak

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup xmake
+        uses: xmake-io/github-action-setup-xmake@v1
+        with:
+          xmake-version: latest
+          package-cache: true
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y build-essential
+
+      - name: Install Xlings
+        run: curl -fsSL https://d2learn.org/xlings-install.sh | bash
+
+      - name: Install GCC 15.1 with Xlings
+        run: |
+          export PATH=/home/xlings/.xlings_data/bin:$PATH
+          xlings install gcc@15.1 -y
+
+      - name: Build
+        run: |
+          export PATH=/home/xlings/.xlings_data/bin:$PATH
+          xmake -y
+
+      - name: Test
+        run: |
+          export PATH=/home/xlings/.xlings_data/bin:$PATH
+          xmake run cmdline_test
+
+      - name: Run examples (smoke)
+        run: |
+          export PATH=/home/xlings/.xlings_data/bin:$PATH
+          xmake run with_dispatch -- add python 3.12
+          xmake run with_dispatch -- remove foo

.gitignore

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+.xmake
+build

LICENSE

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README.md

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+# cmdline
+
+> 一个简单易用的命令行解析库/框架 - `import mcpplibs.cmdline;`
+
+使用 C++23 模块的类型安全命令行解析库。流式链式接口，零样板代码。支持位置参数、短/长选项、子命令、全局标志，以及基于 `std::expected` 的错误处理。
+
+## ✨ 特性
+
+- **C++23 模块** — `import mcpplibs.cmdline`
+
+- **流式接口** — 链式构建方法，所见即所得的 API
+
+- **子命令** — 支持 `action` 回调或手动分发的嵌套命令
+
+- **全局选项** — 标志透明地传播到所有子命令
+
+- **类型安全结果** — `std::expected<ParsedArgs, std::string>`
+
+- **多种解析模式** — 支持 `argc/argv`、`cmdline::Argv`（即 `vector<string>`）或原始 `string_view`
+
+## 快速开始
+
+```cpp
+import std;
+import mcpplibs.cmdline;
+
+using namespace mcpplibs;
+
+int main(int argc, char* argv[]) {
+    auto app = cmdline::App("myapp")
+        .version("1.0.0")
+        .description("A demo CLI")
+        .arg("input").required().help("输入文件")
+        .option("verbose").short_name('v').help("详细输出")
+        .option("config").short_name('c').takes_value().value_name("FILE").help("配置文件")
+        .action([](const cmdline::ParsedArgs& p) {
+            if (p.is_flag_set("verbose")) std::println("详细模式已开启");
+            if (auto c = p.value("config"))  std::println("配置文件: {}", *c);
+            std::println("输入文件: {}", p.positional(0));
+        });
+
+    return app.run(argc, argv);
+}
+```
+
+### 子命令 + action / run
+
+```cpp
+auto app = cmdline::App("demo")
+    .version("0.1.0")
+    .description("Demo: subcommands with action dispatch")
+    .option("yes").short_name('y').global().help("自动确认")
+    .subcommand("add")
+        .description("添加目标")
+        .arg("target").required()
+        .arg("version").required()
+        .action([](const cmdline::ParsedArgs& a) {
+            std::println("add: {}@{}", a.value("target").value_or(""),
+                                       a.value("version").value_or(""));
+        })
+    .subcommand("remove")
+        .description("移除目标")
+        .arg("target").required()
+        .action([](const cmdline::ParsedArgs& a) { std::println("remove: {}", a.positional(0)); });
+
+app.run(argc, argv);
+```
+
+### 多种解析模式
+
+```cpp
+auto r1 = app.parse(argc, argv);
+auto r2 = app.parse_from(cmdline::Argv{"myapp", "add", "x", "1.0"});
+auto r3 = app.parse_from("myapp remove x --yes");
+```
+
+## 构建
+
+```shell
+xmake                       # 构建库
+xmake run basic             # 运行基础示例
+xmake -y run cmdline_test   # 运行测试（自动安装 gtest）
+```
+
+## 集成到构建工具
+
+### xmake
+
+```lua
+-- 添加 mcpplibs 包仓库
+add_repositories("mcpplibs-index https://github.com/mcpplibs/mcpplibs-index.git")
+
+-- 添加依赖
+add_requires("cmdline")
+
+target("mytool")
+    set_kind("binary")
+    set_languages("c++23")
+    add_files("main.cpp")
+    add_packages("cmdline")
+    set_policy("build.c++.modules", true)
+```
+
+### cmake
+
+```
+todo...
+```
+
+## 📄 许可证
+
+Apache-2.0