feat(doc): support multiple file entry (#21018)

This commit adds support for multiple entry points to `deno doc`.

Unfortunately to achieve that, I had to change the semantics of the
command to explicitly require `--filter` parameter for filtering
symbols, instead of treating second free argument as the filter argument.

`deno doc --builtin` is still supported, but cannot be mixed with
actual entrypoints.

4 files changed, 123 insertions, 33 deletions

diff --git a/cli/args/flags.rs b/cli/args/flags.rs
index 6e8b00cab..5b411e36b 100644
--- a/cli/args/flags.rs
+++ b/cli/args/flags.rs
@@ -96,7 +96,7 @@ pub struct CoverageFlags {
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub enum DocSourceFileFlag {
   Builtin,
-  Path(String),
+  Paths(Vec<String>),
 }
 
 impl Default for DocSourceFileFlag {
@@ -109,7 +109,7 @@ impl Default for DocSourceFileFlag {
 pub struct DocFlags {
   pub private: bool,
   pub json: bool,
-  pub source_file: DocSourceFileFlag,
+  pub source_files: DocSourceFileFlag,
   pub filter: Option<String>,
 }
 
@@ -1356,17 +1356,23 @@ Show documentation for runtime built-ins:
             .help("Output private documentation")
             .action(ArgAction::SetTrue),
         )
+        .arg(
+          Arg::new("filter")
+            .long("filter")
+            .help("Dot separated path to symbol")
+            .required(false)
+            .conflicts_with("json"),
+        )
         // TODO(nayeemrmn): Make `--builtin` a proper option. Blocked by
         // https://github.com/clap-rs/clap/issues/1794. Currently `--builtin` is
         // just a possible value of `source_file` so leading hyphens must be
         // enabled.
         .allow_hyphen_values(true)
-        .arg(Arg::new("source_file").value_hint(ValueHint::FilePath))
         .arg(
-          Arg::new("filter")
-            .help("Dot separated path to symbol")
-            .required(false)
-            .conflicts_with("json"),
+          Arg::new("source_file")
+            .num_args(1..)
+            .action(ArgAction::Append)
+            .value_hint(ValueHint::FilePath),
         )
     })
 }
@@ -3090,21 +3096,29 @@ fn doc_parse(flags: &mut Flags, matches: &mut ArgMatches) {
   no_npm_arg_parse(flags, matches);
   no_remote_arg_parse(flags, matches);
 
-  let source_file = matches
-    .remove_one::<String>("source_file")
-    .map(|value| {
-      if value == "--builtin" {
+  let source_files_val = matches.remove_many::<String>("source_file");
+  let source_files = if let Some(val) = source_files_val {
+    let vals: Vec<String> = val.collect();
+
+    if vals.len() == 1 {
+      if vals[0] == "--builtin" {
         DocSourceFileFlag::Builtin
       } else {
-        DocSourceFileFlag::Path(value)
+        DocSourceFileFlag::Paths(vec![vals[0].to_string()])
       }
-    })
-    .unwrap_or_default();
+    } else {
+      DocSourceFileFlag::Paths(
+        vals.into_iter().filter(|v| v != "--builtin").collect(),
+      )
+    }
+  } else {
+    DocSourceFileFlag::Builtin
+  };
   let private = matches.get_flag("private");
   let json = matches.get_flag("json");
   let filter = matches.remove_one::<String>("filter");
   flags.subcommand = DenoSubcommand::Doc(DocFlags {
-    source_file,
+    source_files,
     json,
     filter,
     private,
@@ -5918,7 +5932,7 @@ mod tests {
       r.unwrap(),
       Flags {
         subcommand: DenoSubcommand::Doc(DocFlags {
-          source_file: DocSourceFileFlag::Path("script.ts".to_owned()),
+          source_files: DocSourceFileFlag::Paths(vec!["script.ts".to_owned()]),
           private: false,
           json: false,
           filter: None,
@@ -7178,7 +7192,9 @@ mod tests {
         subcommand: DenoSubcommand::Doc(DocFlags {
           private: false,
           json: true,
-          source_file: DocSourceFileFlag::Path("path/to/module.ts".to_string()),
+          source_files: DocSourceFileFlag::Paths(vec![
+            "path/to/module.ts".to_string()
+          ]),
           filter: None,
         }),
         ..Flags::default()
@@ -7188,8 +7204,9 @@ mod tests {
     let r = flags_from_vec(svec![
       "deno",
       "doc",
+      "--filter",
+      "SomeClass.someField",
       "path/to/module.ts",
-      "SomeClass.someField"
     ]);
     assert_eq!(
       r.unwrap(),
@@ -7197,7 +7214,9 @@ mod tests {
         subcommand: DenoSubcommand::Doc(DocFlags {
           private: false,
           json: false,
-          source_file: DocSourceFileFlag::Path("path/to/module.ts".to_string()),
+          source_files: DocSourceFileFlag::Paths(vec![
+            "path/to/module.ts".to_string()
+          ]),
           filter: Some("SomeClass.someField".to_string()),
         }),
         ..Flags::default()
@@ -7211,21 +7230,27 @@ mod tests {
         subcommand: DenoSubcommand::Doc(DocFlags {
           private: false,
           json: false,
-          source_file: Default::default(),
+          source_files: Default::default(),
           filter: None,
         }),
         ..Flags::default()
       }
     );
 
-    let r = flags_from_vec(svec!["deno", "doc", "--builtin", "Deno.Listener"]);
+    let r = flags_from_vec(svec![
+      "deno",
+      "doc",
+      "--filter",
+      "Deno.Listener",
+      "--builtin"
+    ]);
     assert_eq!(
       r.unwrap(),
       Flags {
         subcommand: DenoSubcommand::Doc(DocFlags {
           private: false,
           json: false,
-          source_file: DocSourceFileFlag::Builtin,
+          source_files: DocSourceFileFlag::Builtin,
           filter: Some("Deno.Listener".to_string()),
         }),
         ..Flags::default()
@@ -7246,7 +7271,9 @@ mod tests {
         subcommand: DenoSubcommand::Doc(DocFlags {
           private: true,
           json: false,
-          source_file: DocSourceFileFlag::Path("path/to/module.js".to_string()),
+          source_files: DocSourceFileFlag::Paths(vec![
+            "path/to/module.js".to_string()
+          ]),
           filter: None,
         }),
         no_npm: true,
@@ -7254,6 +7281,51 @@ mod tests {
         ..Flags::default()
       }
     );
+
+    let r = flags_from_vec(svec![
+      "deno",
+      "doc",
+      "path/to/module.js",
+      "path/to/module2.js"
+    ]);
+    assert_eq!(
+      r.unwrap(),
+      Flags {
+        subcommand: DenoSubcommand::Doc(DocFlags {
+          private: false,
+          json: false,
+          source_files: DocSourceFileFlag::Paths(vec![
+            "path/to/module.js".to_string(),
+            "path/to/module2.js".to_string()
+          ]),
+          filter: None,
+        }),
+        ..Flags::default()
+      }
+    );
+
+    let r = flags_from_vec(svec![
+      "deno",
+      "doc",
+      "path/to/module.js",
+      "--builtin",
+      "path/to/module2.js"
+    ]);
+    assert_eq!(
+      r.unwrap(),
+      Flags {
+        subcommand: DenoSubcommand::Doc(DocFlags {
+          private: false,
+          json: false,
+          source_files: DocSourceFileFlag::Paths(vec![
+            "path/to/module.js".to_string(),
+            "path/to/module2.js".to_string()
+          ]),
+          filter: None,
+        }),
+        ..Flags::default()
+      }
+    );
   }
 
   #[test]
diff --git a/cli/tests/integration/doc_tests.rs b/cli/tests/integration/doc_tests.rs
index cdbee845b..2afa8ca92 100644
--- a/cli/tests/integration/doc_tests.rs
+++ b/cli/tests/integration/doc_tests.rs
@@ -17,12 +17,13 @@ fn deno_doc() {
     let output = context
       .new_command()
       .env("NO_COLOR", "1")
-      .args("doc doc/deno_doc.ts")
+      .args("doc doc/deno_doc.ts doc/deno_doc2.ts")
       .split_output()
       .run();
 
     output.assert_exit_code(0);
     assert_contains!(output.stdout(), "function foo");
+    assert_contains!(output.stdout(), "function bar");
   }
 }
 
@@ -54,7 +55,7 @@ itest!(deno_doc_referenced_private_types {
 
 itest!(_060_deno_doc_displays_all_overloads_in_details_view {
   args:
-    "doc doc/060_deno_doc_displays_all_overloads_in_details_view.ts NS.test",
+    "doc --filter NS.test doc/060_deno_doc_displays_all_overloads_in_details_view.ts",
   output: "doc/060_deno_doc_displays_all_overloads_in_details_view.ts.out",
 });
 
diff --git a/cli/tests/testdata/doc/deno_doc2.ts b/cli/tests/testdata/doc/deno_doc2.ts
new file mode 100644
index 000000000..ee6fc22dc
--- /dev/null
+++ b/cli/tests/testdata/doc/deno_doc2.ts
@@ -0,0 +1,3 @@
+/** Some JSDoc */
+export function bar() {
+}
diff --git a/cli/tools/doc.rs b/cli/tools/doc.rs
index 1a770b2d3..5e87e7917 100644
--- a/cli/tools/doc.rs
+++ b/cli/tools/doc.rs
@@ -33,7 +33,7 @@ pub async fn print_docs(
   let capturing_parser =
     CapturingModuleParser::new(Some(&source_parser), &store);
 
-  let mut doc_nodes = match doc_flags.source_file {
+  let mut doc_nodes = match doc_flags.source_files {
     DocSourceFileFlag::Builtin => {
       let source_file_specifier =
         ModuleSpecifier::parse("internal://lib.deno.d.ts").unwrap();
@@ -64,18 +64,23 @@ pub async fn print_docs(
         doc::DocParser::new(&graph, doc_flags.private, capturing_parser)?;
       doc_parser.parse_module(&source_file_specifier)?.definitions
     }
-    DocSourceFileFlag::Path(source_file) => {
+    DocSourceFileFlag::Paths(source_files) => {
       let module_graph_builder = factory.module_graph_builder().await?;
       let maybe_lockfile = factory.maybe_lockfile();
 
-      let module_specifier =
-        resolve_url_or_path(&source_file, cli_options.initial_cwd())?;
-
+      let module_specifiers: Result<Vec<ModuleSpecifier>, AnyError> =
+        source_files
+          .iter()
+          .map(|source_file| {
+            Ok(resolve_url_or_path(source_file, cli_options.initial_cwd())?)
+          })
+          .collect();
+      let module_specifiers = module_specifiers?;
       let mut loader = module_graph_builder.create_graph_loader();
       let graph = module_graph_builder
         .create_graph_with_options(CreateGraphOptions {
           graph_kind: GraphKind::TypesOnly,
-          roots: vec![module_specifier.clone()],
+          roots: module_specifiers.clone(),
           loader: &mut loader,
           analyzer: &analyzer,
         })
@@ -85,8 +90,17 @@ pub async fn print_docs(
         graph_lock_or_exit(&graph, &mut lockfile.lock());
       }
 
-      doc::DocParser::new(&graph, doc_flags.private, capturing_parser)?
-        .parse_with_reexports(&module_specifier)?
+      let doc_parser =
+        doc::DocParser::new(&graph, doc_flags.private, capturing_parser)?;
+
+      let mut doc_nodes = vec![];
+
+      for module_specifier in module_specifiers {
+        let nodes = doc_parser.parse_with_reexports(&module_specifier)?;
+        doc_nodes.extend_from_slice(&nodes);
+      }
+
+      doc_nodes
     }
   };