first

2026-09-13 13:30:21 +08:00
commit a6bbd520cf
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@@ -0,0 +1,2 @@
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+# Run the real Doxyfile (same config as the published docs: impl/ headers,
+# book chapters, doxygen-awesome styling). All paths in the Doxyfile are
+# relative to the repo root, and OUTPUT_DIRECTORY is empty, so the output
+# lands in html/ at the repo root (gitignored).
+add_custom_target(
+  docs
+  COMMAND ${CMAKE_COMMAND} -E env CLI11_VERSION=${CLI11_VERSION} $<TARGET_FILE:Doxygen::doxygen>
+          "${PROJECT_SOURCE_DIR}/docs/Doxyfile"
+  WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
+  COMMENT "Generating API documentation with Doxygen (output: ${PROJECT_SOURCE_DIR}/html)"
+  VERBATIM)
@@ -0,0 +1,267 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doxygenlayout version="2.0">
+  <!-- Generated by doxygen 1.17.0 -->
+  <!-- Navigation index tabs for HTML output -->
+  <navindex>
+    <tab type="mainpage" visible="yes" title="Introduction"/>
+    <tab type="pages" visible="no" title="" intro=""/>
+    <tab type="usergroup" title="Guide" url="[none]">
+      <tab type="user" url="book-installation.html" title="Installation"/>
+      <tab type="user" url="book-basics.html" title="The Basics"/>
+      <tab type="user" url="book-flags.html" title="Adding Flags"/>
+      <tab type="user" url="book-options.html" title="Options"/>
+      <tab type="user" url="book-validators.html" title="Validators"/>
+      <tab type="user" url="book-subcommands.html" title="Subcommands and the App"/>
+      <tab type="user" url="book-option-groups.html" title="Option groups"/>
+      <tab type="user" url="book-config.html" title="Accepting configure files"/>
+      <tab type="user" url="book-formatting.html" title="Formatting help output"/>
+      <tab type="user" url="book-unicode.html" title="Unicode support"/>
+      <tab type="user" url="book-toolkits.html" title="Using CLI11 in a Toolkit"/>
+      <tab type="user" url="book-advanced-topics.html" title="Advanced topics"/>
+      <tab type="user" url="book-internals.html" title="CLI11 Internals"/>
+    </tab>
+    <tab type="usergroup" title="Examples" url="[none]">
+      <tab type="user" url="book-an-advanced-example.html" title="Making a git clone"/>
+      <tab type="user" url="book-modules-example.html" title="Using CLI11 as a C++20 module"/>
+      <tab type="user" url="example-programs.html" title="Example programs"/>
+    </tab>
+    <tab type="usergroup" title="API Reference" url="[none]">
+      <tab type="topics" visible="yes" title="Errors &amp; Validators" intro=""/>
+      <tab type="namespaces" visible="yes" title="">
+        <tab type="namespacelist" visible="yes" title="" intro=""/>
+        <tab type="namespacemembers" visible="yes" title="" intro=""/>
+      </tab>
+      <tab type="classes" visible="yes" title="">
+        <tab type="classlist" visible="yes" title="" intro=""/>
+        <tab type="classindex" visible="$ALPHABETICAL_INDEX" title=""/>
+        <tab type="hierarchy" visible="yes" title="" intro=""/>
+        <tab type="classmembers" visible="yes" title="" intro=""/>
+      </tab>
+    </tab>
+    <tab type="user" url="changelog.html" title="Changelog"/>
+  </navindex>
+
+  <!-- Layout definition for a class page -->
+  <class>
+    <briefdescription visible="yes"/>
+    <includes visible="$SHOW_HEADERFILE"/>
+    <inheritancegraph visible="yes"/>
+    <collaborationgraph visible="yes"/>
+    <memberdecl>
+      <nestedclasses visible="yes" title=""/>
+      <publictypes visible="yes" title=""/>
+      <services visible="yes" title=""/>
+      <interfaces visible="yes" title=""/>
+      <publicslots visible="yes" title=""/>
+      <signals visible="yes" title=""/>
+      <publicmethods visible="yes" title=""/>
+      <publicstaticmethods visible="yes" title=""/>
+      <publicattributes visible="yes" title=""/>
+      <publicstaticattributes visible="yes" title=""/>
+      <protectedtypes visible="yes" title=""/>
+      <protectedslots visible="yes" title=""/>
+      <protectedmethods visible="yes" title=""/>
+      <protectedstaticmethods visible="yes" title=""/>
+      <protectedattributes visible="yes" title=""/>
+      <protectedstaticattributes visible="yes" title=""/>
+      <packagetypes visible="yes" title=""/>
+      <packagemethods visible="yes" title=""/>
+      <packagestaticmethods visible="yes" title=""/>
+      <packageattributes visible="yes" title=""/>
+      <packagestaticattributes visible="yes" title=""/>
+      <properties visible="yes" title=""/>
+      <events visible="yes" title=""/>
+      <privatetypes visible="yes" title=""/>
+      <privateslots visible="yes" title=""/>
+      <privatemethods visible="yes" title=""/>
+      <privatestaticmethods visible="yes" title=""/>
+      <privateattributes visible="yes" title=""/>
+      <privatestaticattributes visible="yes" title=""/>
+      <friends visible="yes" title=""/>
+      <related visible="yes" title="" subtitle=""/>
+      <membergroups visible="yes"/>
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+    <detaileddescription visible="yes" title=""/>
+    <memberdef>
+      <inlineclasses visible="yes" title=""/>
+      <typedefs visible="yes" title=""/>
+      <enums visible="yes" title=""/>
+      <services visible="yes" title=""/>
+      <interfaces visible="yes" title=""/>
+      <constructors visible="yes" title=""/>
+      <functions visible="yes" title=""/>
+      <related visible="yes" title=""/>
+      <variables visible="yes" title=""/>
+      <properties visible="yes" title=""/>
+      <events visible="yes" title=""/>
+    </memberdef>
+    <allmemberslink visible="yes"/>
+    <usedfiles visible="$SHOW_USED_FILES"/>
+    <authorsection visible="yes"/>
+  </class>
+
+  <!-- Layout definition for a namespace page -->
+  <namespace>
+    <briefdescription visible="yes"/>
+    <memberdecl>
+      <nestednamespaces visible="yes" title=""/>
+      <constantgroups visible="yes" title=""/>
+      <interfaces visible="yes" title=""/>
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+      <structs visible="yes" title=""/>
+      <exceptions visible="yes" title=""/>
+      <typedefs visible="yes" title=""/>
+      <sequences visible="yes" title=""/>
+      <dictionaries visible="yes" title=""/>
+      <enums visible="yes" title=""/>
+      <functions visible="yes" title=""/>
+      <variables visible="yes" title=""/>
+      <properties visible="yes" title=""/>
+      <membergroups visible="yes"/>
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+    <detaileddescription visible="yes" title=""/>
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+      <inlineclasses visible="yes" title=""/>
+      <typedefs visible="yes" title=""/>
+      <sequences visible="yes" title=""/>
+      <dictionaries visible="yes" title=""/>
+      <enums visible="yes" title=""/>
+      <functions visible="yes" title=""/>
+      <variables visible="yes" title=""/>
+      <properties visible="yes" title=""/>
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+    <authorsection visible="yes"/>
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+
+  <!-- Layout definition for a concept page -->
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+    <briefdescription visible="yes"/>
+    <includes visible="$SHOW_HEADERFILE"/>
+    <definition visible="yes" title=""/>
+    <detaileddescription visible="yes" title=""/>
+    <authorsection visible="yes"/>
+  </concept>
+
+  <!-- Layout definition for a file page -->
+  <file>
+    <briefdescription visible="yes"/>
+    <includes visible="$SHOW_INCLUDE_FILES"/>
+    <includegraph visible="yes"/>
+    <includedbygraph visible="yes"/>
+    <sourcelink visible="yes"/>
+    <memberdecl>
+      <interfaces visible="yes" title=""/>
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+      <namespaces visible="yes" title=""/>
+      <concepts visible="yes" title=""/>
+      <constantgroups visible="yes" title=""/>
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+      <typedefs visible="yes" title=""/>
+      <sequences visible="yes" title=""/>
+      <dictionaries visible="yes" title=""/>
+      <enums visible="yes" title=""/>
+      <functions visible="yes" title=""/>
+      <variables visible="yes" title=""/>
+      <properties visible="yes" title=""/>
+      <membergroups visible="yes"/>
+    </memberdecl>
+    <detaileddescription visible="yes" title=""/>
+    <memberdef>
+      <inlineclasses visible="yes" title=""/>
+      <defines visible="yes" title=""/>
+      <typedefs visible="yes" title=""/>
+      <sequences visible="yes" title=""/>
+      <dictionaries visible="yes" title=""/>
+      <enums visible="yes" title=""/>
+      <functions visible="yes" title=""/>
+      <variables visible="yes" title=""/>
+      <properties visible="yes" title=""/>
+    </memberdef>
+    <authorsection/>
+  </file>
+
+  <!-- Layout definition for a group page -->
+  <group>
+    <briefdescription visible="yes"/>
+    <groupgraph visible="yes"/>
+    <memberdecl>
+      <nestedgroups visible="yes" title=""/>
+      <modules visible="yes" title=""/>
+      <dirs visible="yes" title=""/>
+      <files visible="yes" title=""/>
+      <namespaces visible="yes" title=""/>
+      <concepts visible="yes" title=""/>
+      <classes visible="yes" title=""/>
+      <defines visible="yes" title=""/>
+      <typedefs visible="yes" title=""/>
+      <sequences visible="yes" title=""/>
+      <dictionaries visible="yes" title=""/>
+      <enums visible="yes" title=""/>
+      <enumvalues visible="yes" title=""/>
+      <functions visible="yes" title=""/>
+      <variables visible="yes" title=""/>
+      <signals visible="yes" title=""/>
+      <publicslots visible="yes" title=""/>
+      <protectedslots visible="yes" title=""/>
+      <privateslots visible="yes" title=""/>
+      <events visible="yes" title=""/>
+      <properties visible="yes" title=""/>
+      <friends visible="yes" title=""/>
+      <membergroups visible="yes"/>
+    </memberdecl>
+    <detaileddescription visible="yes" title=""/>
+    <memberdef>
+      <pagedocs/>
+      <inlineclasses visible="yes" title=""/>
+      <defines visible="yes" title=""/>
+      <typedefs visible="yes" title=""/>
+      <sequences visible="yes" title=""/>
+      <dictionaries visible="yes" title=""/>
+      <enums visible="yes" title=""/>
+      <enumvalues visible="yes" title=""/>
+      <functions visible="yes" title=""/>
+      <variables visible="yes" title=""/>
+      <signals visible="yes" title=""/>
+      <publicslots visible="yes" title=""/>
+      <protectedslots visible="yes" title=""/>
+      <privateslots visible="yes" title=""/>
+      <events visible="yes" title=""/>
+      <properties visible="yes" title=""/>
+      <friends visible="yes" title=""/>
+    </memberdef>
+    <authorsection visible="yes"/>
+  </group>
+
+  <!-- Layout definition for a C++20 module page -->
+  <module>
+    <briefdescription visible="yes"/>
+    <exportedmodules visible="yes"/>
+    <memberdecl>
+      <concepts visible="yes" title=""/>
+      <classes visible="yes" title=""/>
+      <enums visible="yes" title=""/>
+      <typedefs visible="yes" title=""/>
+      <functions visible="yes" title=""/>
+      <variables visible="yes" title=""/>
+      <membergroups visible="yes" title=""/>
+    </memberdecl>
+    <detaileddescription visible="yes" title=""/>
+    <memberdecl>
+      <files visible="yes"/>
+    </memberdecl>
+  </module>
+
+  <!-- Layout definition for a directory page -->
+  <directory>
+    <briefdescription visible="yes"/>
+    <directorygraph visible="yes"/>
+    <memberdecl>
+      <dirs visible="yes"/>
+      <files visible="yes"/>
+    </memberdecl>
+    <detaileddescription visible="yes" title=""/>
+  </directory>
+</doxygenlayout>
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: MIT
+/**
+
+Doxygen Awesome
+https://github.com/jothepro/doxygen-awesome-css
+
+Copyright (c) 2021 - 2025 jothepro
+
+*/
+
+class DoxygenAwesomeDarkModeToggle extends HTMLElement {
+    // SVG icons from https://fonts.google.com/icons
+    // Licensed under the Apache 2.0 license:
+    // https://www.apache.org/licenses/LICENSE-2.0.html
+    static lightModeIcon = `<svg xmlns="http://www.w3.org/2000/svg" enable-background="new 0 0 24 24" height="24px" viewBox="0 0 24 24" width="24px" fill="#FCBF00"><rect fill="none" height="24" width="24"/><circle cx="12" cy="12" opacity=".3" r="3"/><path d="M12,9c1.65,0,3,1.35,3,3s-1.35,3-3,3s-3-1.35-3-3S10.35,9,12,9 M12,7c-2.76,0-5,2.24-5,5s2.24,5,5,5s5-2.24,5-5 S14.76,7,12,7L12,7z M2,13l2,0c0.55,0,1-0.45,1-1s-0.45-1-1-1l-2,0c-0.55,0-1,0.45-1,1S1.45,13,2,13z M20,13l2,0c0.55,0,1-0.45,1-1 s-0.45-1-1-1l-2,0c-0.55,0-1,0.45-1,1S19.45,13,20,13z M11,2v2c0,0.55,0.45,1,1,1s1-0.45,1-1V2c0-0.55-0.45-1-1-1S11,1.45,11,2z M11,20v2c0,0.55,0.45,1,1,1s1-0.45,1-1v-2c0-0.55-0.45-1-1-1C11.45,19,11,19.45,11,20z M5.99,4.58c-0.39-0.39-1.03-0.39-1.41,0 c-0.39,0.39-0.39,1.03,0,1.41l1.06,1.06c0.39,0.39,1.03,0.39,1.41,0s0.39-1.03,0-1.41L5.99,4.58z M18.36,16.95 c-0.39-0.39-1.03-0.39-1.41,0c-0.39,0.39-0.39,1.03,0,1.41l1.06,1.06c0.39,0.39,1.03,0.39,1.41,0c0.39-0.39,0.39-1.03,0-1.41 L18.36,16.95z M19.42,5.99c0.39-0.39,0.39-1.03,0-1.41c-0.39-0.39-1.03-0.39-1.41,0l-1.06,1.06c-0.39,0.39-0.39,1.03,0,1.41 s1.03,0.39,1.41,0L19.42,5.99z M7.05,18.36c0.39-0.39,0.39-1.03,0-1.41c-0.39-0.39-1.03-0.39-1.41,0l-1.06,1.06 c-0.39,0.39-0.39,1.03,0,1.41s1.03,0.39,1.41,0L7.05,18.36z"/></svg>`
+    static darkModeIcon = `<svg xmlns="http://www.w3.org/2000/svg" enable-background="new 0 0 24 24" height="24px" viewBox="0 0 24 24" width="24px" fill="#FE9700"><rect fill="none" height="24" width="24"/><path d="M9.37,5.51C9.19,6.15,9.1,6.82,9.1,7.5c0,4.08,3.32,7.4,7.4,7.4c0.68,0,1.35-0.09,1.99-0.27 C17.45,17.19,14.93,19,12,19c-3.86,0-7-3.14-7-7C5,9.07,6.81,6.55,9.37,5.51z" opacity=".3"/><path d="M9.37,5.51C9.19,6.15,9.1,6.82,9.1,7.5c0,4.08,3.32,7.4,7.4,7.4c0.68,0,1.35-0.09,1.99-0.27C17.45,17.19,14.93,19,12,19 c-3.86,0-7-3.14-7-7C5,9.07,6.81,6.55,9.37,5.51z M12,3c-4.97,0-9,4.03-9,9s4.03,9,9,9s9-4.03,9-9c0-0.46-0.04-0.92-0.1-1.36 c-0.98,1.37-2.58,2.26-4.4,2.26c-2.98,0-5.4-2.42-5.4-5.4c0-1.81,0.89-3.42,2.26-4.4C12.92,3.04,12.46,3,12,3L12,3z"/></svg>`
+    static title = "Toggle Light/Dark Mode"
+
+    static prefersLightModeInDarkModeKey = "prefers-light-mode-in-dark-mode"
+    static prefersDarkModeInLightModeKey = "prefers-dark-mode-in-light-mode"
+
+    static _staticConstructor = function() {
+        DoxygenAwesomeDarkModeToggle.enableDarkMode(DoxygenAwesomeDarkModeToggle.userPreference)
+        // Update the color scheme when the browsers preference changes
+        // without user interaction on the website.
+        window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', event => {
+            DoxygenAwesomeDarkModeToggle.onSystemPreferenceChanged()
+        })
+        // Update the color scheme when the tab is made visible again.
+        // It is possible that the appearance was changed in another tab 
+        // while this tab was in the background.
+        document.addEventListener("visibilitychange", visibilityState => {
+            if (document.visibilityState === 'visible') {
+                DoxygenAwesomeDarkModeToggle.onSystemPreferenceChanged()
+            }
+        });
+    }()
+
+    static init() {
+        $(function() {
+            $(document).ready(function() {
+                const toggleButton = document.createElement('doxygen-awesome-dark-mode-toggle')
+                toggleButton.title = DoxygenAwesomeDarkModeToggle.title
+                toggleButton.updateIcon()
+
+                window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', event => {
+                    toggleButton.updateIcon()
+                })
+                document.addEventListener("visibilitychange", visibilityState => {
+                    if (document.visibilityState === 'visible') {
+                        toggleButton.updateIcon()
+                    }
+                });
+
+                $(document).ready(function(){
+                    document.getElementById("MSearchBox").parentNode.appendChild(toggleButton)
+                })
+                $(window).resize(function(){
+                    document.getElementById("MSearchBox").parentNode.appendChild(toggleButton)
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+
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+    static onUserPreferenceChanged() {
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+/* SPDX-License-Identifier: MIT */
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+
+Copyright (c) 2021 - 2025 jothepro
+
+ */
+
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+  --menu-display: none;
+
+  --top-height: 120px;
+  --toc-sticky-top: -25px;
+  --toc-max-height: calc(100vh - 2 * var(--spacing-medium) - 25px);
+}
+
+#projectname {
+  white-space: nowrap;
+}
+
+@media screen and (min-width: 768px) {
+  html {
+    --searchbar-background: var(--page-background-color);
+  }
+
+  #side-nav {
+    min-width: var(--side-nav-fixed-width);
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+    top: var(--top-height);
+    overflow: visible;
+  }
+
+  #nav-tree,
+  #side-nav {
+    height: calc(100vh - var(--top-height)) !important;
+  }
+
+  #top {
+    display: block;
+    border-bottom: none;
+    height: var(--top-height);
+    margin-bottom: calc(0px - var(--top-height));
+    max-width: var(--side-nav-fixed-width);
+    overflow: hidden;
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+  #nav-path {
+    position: fixed;
+    right: 0;
+    left: calc(var(--side-nav-fixed-width) + 1px);
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+  #doc-content {
+    height: calc(100vh - 31px) !important;
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+    margin-left: var(--side-nav-fixed-width) !important;
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+  #MSearchBox {
+    width: calc(var(--side-nav-fixed-width) - calc(2 * var(--spacing-medium)));
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+      var(--side-nav-fixed-width) - calc(2 * var(--spacing-medium)) - 65px
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+  #nav-sync {
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+    width: 35px;
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+    position: fixed;
+  }
+}
@@ -0,0 +1,37 @@
+/* CLI11 tweaks on top of doxygen-awesome (sidebar-only layout). */
+
+/* doxygen-awesome hides the sidebar expander arrows until hover, which makes
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+html {
+  --side-nav-arrow-opacity: 0.4;
+  --side-nav-arrow-hover-opacity: 0.9;
+
+  /* The theme reserves --top-height for the sidebar header (title + search).
+     Its 120px default is a few pixels too short for our logo + two-line brief,
+     which clips the bottom of the search bar. */
+  --top-height: 140px;
+}
+
+/* The sidebar header already shows the project name, so the always-expanded
+   "CLI11" root node in the navtree is redundant. Hide its row and shift the
+   remaining rows left one indent level (the tree indents 16px per level with
+   inline padding, so a fixed negative margin promotes every row equally). */
+#nav-tree-contents > ul > li > div.item {
+  display: none;
+}
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+#nav-tree-contents ul.children_ul .arrow {
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+}
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@@ -0,0 +1,138 @@
+# Example programs {#example-programs}
+
+The [`examples/`][examples] directory holds small, complete programs. Each one
+builds and runs on its own, so you can copy a file into your project and change
+it. Build them with the `CLI11_BUILD_EXAMPLES` CMake option, which is on by
+default when CLI11 is the top level project.
+
+Read @ref book-an-advanced-example for a step by step walkthrough of a larger
+program.
+
+## Start here
+
+`minimal.cpp` is the smallest program that parses and exits correctly. Use it as
+a starting point for a new application:
+
+\include minimal.cpp
+
+`simple.cpp` adds options, a flag, and a version flag, and shows how to read the
+values and the counts back after the parse:
+
+\include simple.cpp
+
+## Options and flags
+
+| Example                      | Shows                                                        |
+| ---------------------------- | ------------------------------------------------------------ |
+| [array_option.cpp][]         | An option that fills a `std::array`                          |
+| [digit_args.cpp][]           | Numbered flags (`-1` to `-9`) with values attached           |
+| [enum.cpp][]                 | An option that takes an `enum class` value                   |
+| [enum_ostream.cpp][]         | A custom `operator<<` for an `enum class` in help and errors |
+| [ranges.cpp][]               | Options that accept a range of values                        |
+| [retired.cpp][]              | Retired and deprecated options                               |
+| [inter_argument_order.cpp][] | Recovery of the original order of unlimited arguments        |
+| [custom_parse.cpp][]         | A custom lexical cast for a user type                        |
+
+## Validators
+
+| Example                       | Shows                                              |
+| ----------------------------- | -------------------------------------------------- |
+| [validators.cpp][]            | The built in `ExistingFile` and `Range` validators |
+| [custom_validator.cpp][]      | A `CLI::Validator` subclass                        |
+| [date_validator.cpp][]        | A `CLI::CustomValidator` built from a lambda       |
+| [positional_validation.cpp][] | Validators that select between positionals         |
+
+## Subcommands and groups
+
+| Example                    | Shows                                                  |
+| -------------------------- | ------------------------------------------------------ |
+| [subcommands.cpp][]        | Basic subcommands and `--help-all`                     |
+| [subcom_help.cpp][]        | A required argument on a subcommand                    |
+| [subcom_partitioned.cpp][] | Subcommands built as separate `CLI::App_p` objects     |
+| [subcom_in_files][]        | A subcommand defined in its own source and header file |
+| [shapes.cpp][]             | Repeated subcommands with immediate callbacks          |
+| [nested.cpp][]             | Nested subcommands                                     |
+| [groups.cpp][]             | Help groups                                            |
+| [option_groups.cpp][]      | Option groups and the requirements between them        |
+| [positional_arity.cpp][]   | Option groups that select on the number of positionals |
+
+## Help output
+
+| Example             | Shows                                            |
+| ------------------- | ------------------------------------------------ |
+| [formatter.cpp][]   | A `CLI::Formatter` subclass                      |
+| [help_usage.cpp][]  | A custom usage line and wide character support   |
+| [modhelp.cpp][]     | Help printed after the parse, with option values |
+| [close_match.cpp][] | A "did you mean" message for an unknown option   |
+
+## Configuration files
+
+| Example            | Shows                                                           |
+| ------------------ | --------------------------------------------------------------- |
+| [config_app.cpp][] | Reading a configuration file and printing the result            |
+| [json.cpp][]       | A JSON configuration file, with [nlohmann/json][] as the parser |
+
+## Passing arguments on
+
+| Example                      | Shows                                           |
+| ---------------------------- | ----------------------------------------------- |
+| [prefix_command.cpp][]       | `prefix_command` on the main application        |
+| [arg_capture.cpp][]          | `prefix_command` on a subcommand, with an alias |
+| [callback_passthrough.cpp][] | A callback that parses the remaining arguments  |
+| [testEXE.cpp][]              | Arguments collected for another program         |
+
+[examples]: https://github.com/CLIUtils/CLI11/tree/main/examples
+[nlohmann/json]: https://github.com/nlohmann/json
+[arg_capture.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/arg_capture.cpp
+[array_option.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/array_option.cpp
+[callback_passthrough.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/callback_passthrough.cpp
+[close_match.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/close_match.cpp
+[config_app.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/config_app.cpp
+[custom_parse.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/custom_parse.cpp
+[custom_validator.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/custom_validator.cpp
+[date_validator.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/date_validator.cpp
+[digit_args.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/digit_args.cpp
+[enum.cpp]: https://github.com/CLIUtils/CLI11/blob/main/examples/enum.cpp
+[enum_ostream.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/enum_ostream.cpp
+[formatter.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/formatter.cpp
+[groups.cpp]: https://github.com/CLIUtils/CLI11/blob/main/examples/groups.cpp
+[help_usage.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/help_usage.cpp
+[inter_argument_order.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/inter_argument_order.cpp
+[json.cpp]: https://github.com/CLIUtils/CLI11/blob/main/examples/json.cpp
+[modhelp.cpp]: https://github.com/CLIUtils/CLI11/blob/main/examples/modhelp.cpp
+[nested.cpp]: https://github.com/CLIUtils/CLI11/blob/main/examples/nested.cpp
+[option_groups.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/option_groups.cpp
+[positional_arity.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/positional_arity.cpp
+[positional_validation.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/positional_validation.cpp
+[prefix_command.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/prefix_command.cpp
+[ranges.cpp]: https://github.com/CLIUtils/CLI11/blob/main/examples/ranges.cpp
+[retired.cpp]: https://github.com/CLIUtils/CLI11/blob/main/examples/retired.cpp
+[shapes.cpp]: https://github.com/CLIUtils/CLI11/blob/main/examples/shapes.cpp
+[subcom_help.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/subcom_help.cpp
+[subcom_in_files]:
+  https://github.com/CLIUtils/CLI11/tree/main/examples/subcom_in_files
+[subcom_partitioned.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/subcom_partitioned.cpp
+[subcommands.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/subcommands.cpp
+[testEXE.cpp]: https://github.com/CLIUtils/CLI11/blob/main/examples/testEXE.cpp
+[validators.cpp]:
+  https://github.com/CLIUtils/CLI11/blob/main/examples/validators.cpp
@@ -0,0 +1,123 @@
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+        document.getElementById("titlearea").appendChild(toggleButton)
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+    // The navtree renders with every group collapsed except the current
+    // page's path. Start the top-level groups (Guide, Examples, API
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+  <!--BEGIN PROJECT_NAME-->
+  <td id="projectalign">
+   <div id="projectname">$projectname<!--BEGIN PROJECT_NUMBER--><span id="projectnumber">&#160;$projectnumber</span><!--END PROJECT_NUMBER-->
+   </div>
+   <!--BEGIN PROJECT_BRIEF--><div id="projectbrief">$projectbrief</div><!--END PROJECT_BRIEF-->
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+  <!--END PROJECT_NAME-->
+  <!--BEGIN !PROJECT_NAME-->
+   <!--BEGIN PROJECT_BRIEF-->
+    <td>
+    <div id="projectbrief">$projectbrief</div>
+    </td>
+   <!--END PROJECT_BRIEF-->
+  <!--END !PROJECT_NAME-->
+  <!--BEGIN DISABLE_INDEX-->
+   <!--BEGIN SEARCHENGINE-->
+     <!--BEGIN !FULL_SIDEBAR-->
+    <td>$searchbox</td>
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+  <!--BEGIN SEARCHENGINE-->
+   <!--BEGIN FULL_SIDEBAR-->
+   <tr><td colspan="2">$searchbox</td></tr>
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+<!-- end header part -->
@@ -0,0 +1,123 @@
+# Introduction {#mainpage}
+
+CLI11 lets you write your own command line programs in C++. The library is
+designed to be clean, intuitive, but powerful. There are no requirements beyond
+C++11 support (and even `<regex>` support not required). It works on Mac, Linux,
+and Windows, and has 100% test coverage on all three systems. You can simply
+drop in a single header file (`CLI11.hpp` available in [releases][]) to use
+CLI11 in your own application. Other ways to integrate it into a build system
+are listed in the [README][].
+
+The library was inspired by the Python libraries [Plumbum][] and [Click][], and
+incorporates many of their user friendly features.
+
+The syntax is simple and scales from a basic application to a massive physics
+analysis with multiple models and many parameters and switches. For example,
+this is a simple program that has an optional parameter that defaults to 0:
+
+```text
+$ ./a.out
+Parameter value: 0
+
+$ ./a.out -p 4
+Parameter value: 4
+
+$ ./a.out --help
+App description
+Usage: ./a.out [OPTIONS]
+
+Options:
+  -h,--help                   Print this help message and exit
+  -p INT                      Parameter
+```
+
+Like any good command line application, help is provided. This program can be
+implemented in only a few lines:
+
+\include intro.cpp
+
+[Source code](https://github.com/CLIUtils/CLI11/blob/main/book/code/intro.cpp)
+
+Unlike some other libraries, this is enough to exit correctly and cleanly if
+help is requested or if incorrect arguments are passed. You can try this example
+out for yourself. To compile with GCC:
+
+```text
+c++ -std=c++11 intro.cpp
+```
+
+Much more complicated options are handled elegantly:
+
+```cpp
+std::string file;
+app.add_option("-f,--file", file, "Require an existing file")
+  ->required()
+  ->check(CLI::ExistingFile);
+```
+
+You can use any valid type; the above example could have used a
+`boost::file_system` file instead of a `std::string`. The value is a real value
+and does not require any special lookups to access. You do not have to risk
+typos by repeating the values after parsing like some libraries require. The
+library also handles positional arguments, flags, fixed or unlimited repeating
+options, interdependent options, flags, custom validators, help groups, and
+more.
+
+You can use subcommands, as well. Subcommands support callback lambda functions
+when parsed, or they can be checked later. You can infinitely nest subcommands,
+and each is a full `App` instance, supporting everything listed above.
+
+Reading/producing `.ini` files for configuration is also supported, as is using
+environment variables as input. The base `App` can be subclassed and customized
+for use in a toolkit (like [GooFit][]). All the standard shell idioms, like
+`--`, work as well.
+
+The guide chapters in the sidebar walk through the library step by step,
+starting with [installation](@ref book-installation) and a first program. The
+examples section shows complete programs: the @ref book-an-advanced-example
+walkthrough, and @ref example-programs, an index of the programs that ship with
+CLI11. Feel free to contribute to [the guide here][cli11guide] if something can
+be improved!
+
+## API reference
+
+The main classes are:
+
+| Name           | Where used                                                |
+| -------------- | --------------------------------------------------------- |
+| CLI::Option    | Options, stored in the app                                |
+| CLI::App       | The main application or subcommands                       |
+| CLI::Validator | A check that can affect the type name                     |
+| CLI::Formatter | A subclassable formatter for help printing                |
+| CLI::ExitCode  | A scoped enum with exit codes                             |
+| CLI::Timer     | A timer class, only in CLI/Timer.hpp (not in `CLI11.hpp`) |
+| CLI::AutoTimer | A timer that prints on deletion                           |
+
+Groups of related topics:
+
+| Name                 | Description                                    |
+| -------------------- | ---------------------------------------------- |
+| @ref error_group     | Errors that can be thrown                      |
+| @ref validator_group | Common validators used in CLI::Option::check() |
+
+Full indexes:
+
+- [Errors & Validators](topics.html)
+- [Namespace List](namespaces.html)
+- [Class List](annotated.html)
+
+## About
+
+CLI11 was developed at the [University of Cincinnati][] in support of the
+[GooFit][] library under [NSF Award 1414736][nsf 1414736]. It was featured in a
+[DIANA/HEP][] meeting at CERN. Please give it a try! Feedback is always welcome.
+
+[goofit]: https://github.com/GooFit/GooFit
+[diana/hep]: https://diana-hep.org
+[releases]: https://github.com/CLIUtils/CLI11/releases
+[readme]: https://github.com/CLIUtils/CLI11/blob/main/README.md
+[nsf 1414736]: https://nsf.gov/awardsearch/showAward?AWD_ID=1414736
+[university of cincinnati]: https://www.uc.edu
+[cli11guide]: https://github.com/CLIUtils/CLI11/tree/main/book
+[plumbum]: https://plumbum.readthedocs.io/en/latest/
+[click]: https://click.palletsprojects.com