Highlight doc tests in rust

Feels a big laggy when system overloaded

rc/filetype/rust.kak

@@ -34,9 +34,34 @@ add-highlighter shared/rust regions
 add-highlighter shared/rust/code default-region group
 add-highlighter shared/rust/string           region %{(?<!')"} (?<!\\)(\\\\)*"              fill string
 add-highlighter shared/rust/raw_string       region -match-capture %{(?<!')r(#*)"} %{"(#*)} fill string
-add-highlighter shared/rust/comment          region -recurse "/\*" "/\*" "\*/"              fill comment
+
-add-highlighter shared/rust/documentation    region "//[!/]" "$"                            fill documentation
+add-highlighter shared/rust/line_doctest region ^\h*//[!/]\h*```($|should_panic|no_run|ignore|allow_fail|rust|test_harness|compile_fail|E\d{4}|edition201[58]) ^\h*//[!/]\h*```$ regions
-add-highlighter shared/rust/line_comment     region "//" "$"                                fill comment
+add-highlighter shared/rust/line_doctest/marker region ```.* $ group
+add-highlighter shared/rust/line_doctest/marker/fence regex ``` 0:meta
+add-highlighter shared/rust/line_doctest/marker/keywords regex [\d\w] 0:meta # already matched above, just ignore comma
+add-highlighter shared/rust/line_doctest/inner region '^\h*//[!/]\h+#' ' ' group
+add-highlighter shared/rust/line_doctest/inner/comment regex //[!/] 0:documentation
+add-highlighter shared/rust/line_doctest/inner/hidden regex '#' 0:meta
+add-highlighter shared/rust/line_doctest/comment region ^\h*//[!/] ' '                      fill documentation
+add-highlighter shared/rust/line_doctest/code default-region ref rust
+add-highlighter shared/rust/line_code_rest   region ^\h*//[!/]\h*``` ^\h*//[!/]\h*```$      fill documentation # reset invalid doctest
+add-highlighter shared/rust/line_comment2    region //[!/]{2} $                             fill comment
+add-highlighter shared/rust/line_doc         region //[!/] $                                fill documentation
+add-highlighter shared/rust/line_comment1    region // $                                    fill comment
+
+add-highlighter shared/rust/block_comment2   region -recurse /\*\*\* /\*\*\* \*/            fill comment
+add-highlighter shared/rust/block_doc        region -recurse /\*\* /\*\* \*/ regions
+add-highlighter shared/rust/block_doc/doctest region ```($|should_panic|no_run|ignore|allow_fail|rust|test_harness|compile_fail|E\d{4}|edition201[58]) ```$ regions
+add-highlighter shared/rust/block_doc/doctest/marker region ```.* $ group
+add-highlighter shared/rust/block_doc/doctest/marker/fence regex ``` 0:meta
+add-highlighter shared/rust/block_doc/doctest/marker/keywords regex [\d\w] 0:meta # already matched above, just ignore comma
+add-highlighter shared/rust/block_doc/doctest/inner default-region group
+add-highlighter shared/rust/block_doc/doctest/inner/hidden regex '^\h*\**\h*#' 0:meta
+add-highlighter shared/rust/block_doc/doctest/inner/comment regex ^\h*\* 0:documentation
+add-highlighter shared/rust/block_doc/doctest/inner/code ref rust
+add-highlighter shared/rust/block_doc/code_rest region ``` ``` fill documentation
+add-highlighter shared/rust/block_doc/doc    default-region fill documentation
+add-highlighter shared/rust/block_comment1   region -recurse /\* /\* \*/                    fill comment
 
 add-highlighter shared/rust/macro_attributes region -recurse "\[" "#!?\[" "\]" regions
 add-highlighter shared/rust/macro_attributes/ default-region fill meta

test/highlight/rust/comment/cmd

@@ -0,0 +1 @@
+

test/highlight/rust/comment/in

@@ -0,0 +1,88 @@
+//! # Hello World
+//!
+//! ```shell
+//! $ cargo install
+//! ```
+//!
+//! ```
+//! # use foo;
+//! foo::bar("Hello world");
+//! ```
+
+//!! ```
+//!! foo::bar("Hello world");
+//!! ```
+
+//// ```
+//// foo::bar("Hello world");
+//// ```
+
+// ```
+// foo::bar("Hello world");
+// ```
+
+// make sure the color does not break
+/// ```
+/// # use foo;
+/// foo::bar("Hello world");
+/// ```
+fn bar(s: &str) {
+    println!("{}", s);
+}
+
+    /// ```shell
+    /// $ cargo install
+    /// ```
+    ///
+    /// ```edition2018,no_run
+    /// # use foo;
+    /// foo::bar("Hello world");
+    /// ```
+    ///
+    /// ```
+    /// # use foo;
+    /// foo::bar("Hello world");
+    /// ```
+
+    //!! ```
+    //!! foo::bar("Hello world");
+    //!! ```
+
+    //// ```
+    //// foo::bar("Hello world");
+    //// ```
+
+    // ```
+    // foo::bar("Hello world");
+    // ```
+
+    /**
+     * ```shell
+     * $ cargo install
+     * ```
+     *
+     * ```edition2018,no_run
+     * # use foo;
+     * foo::bar("Hello world");
+     * ```
+     */
+
+    /**
+     ```
+     # use foo;
+     foo::bar("Hello world");
+     ```
+     */
+
+    /***
+     * ```
+     * foo::bar("Hello world");
+     * ```
+     */
+
+    /*
+     * ```
+     * foo::bar("Hello world");
+     * ```
+     */
+

test/highlight/rust/comment/rc

@@ -0,0 +1,3 @@
+source "%val{runtime}/colors/default.kak"
+source "%val{runtime}/rc/filetype/rust.kak"
+set buffer filetype rust