feat(cli): json option for "deno info" (#6372)

7 files changed, 212 insertions, 92 deletions

diff --git a/cli/flags.rs b/cli/flags.rs
index eb98c6032..313d8ff1a 100644
--- a/cli/flags.rs
+++ b/cli/flags.rs
@@ -41,6 +41,7 @@ pub enum DenoSubcommand {
   },
   Help,
   Info {
+    json: bool,
     file: Option<String>,
   },
   Install {
@@ -454,10 +455,11 @@ fn eval_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
 fn info_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
   ca_file_arg_parse(flags, matches);
   unstable_arg_parse(flags, matches);
+  let json = matches.is_present("json");
   no_check_arg_parse(flags, matches);
-
   flags.subcommand = DenoSubcommand::Info {
     file: matches.value_of("file").map(|f| f.to_string()),
+    json,
   };
 }
 
@@ -824,6 +826,12 @@ TypeScript compiler cache: Subdirectory containing TS compiler output.",
     .arg(ca_file_arg())
     .arg(no_check_arg())
     .arg(unstable_arg())
+    .arg(
+      Arg::with_name("json")
+        .long("json")
+        .help("Outputs the information in JSON format")
+        .takes_value(false),
+    )
 }
 
 fn cache_subcommand<'a, 'b>() -> App<'a, 'b> {
@@ -1784,6 +1792,19 @@ mod tests {
       r.unwrap(),
       Flags {
         subcommand: DenoSubcommand::Info {
+          json: false,
+          file: Some("script.ts".to_string()),
+        },
+        ..Flags::default()
+      }
+    );
+
+    let r = flags_from_vec_safe(svec!["deno", "info", "--json", "script.ts"]);
+    assert_eq!(
+      r.unwrap(),
+      Flags {
+        subcommand: DenoSubcommand::Info {
+          json: true,
           file: Some("script.ts".to_string()),
         },
         ..Flags::default()
@@ -1794,7 +1815,22 @@ mod tests {
     assert_eq!(
       r.unwrap(),
       Flags {
-        subcommand: DenoSubcommand::Info { file: None },
+        subcommand: DenoSubcommand::Info {
+          json: false,
+          file: None
+        },
+        ..Flags::default()
+      }
+    );
+
+    let r = flags_from_vec_safe(svec!["deno", "info", "--json"]);
+    assert_eq!(
+      r.unwrap(),
+      Flags {
+        subcommand: DenoSubcommand::Info {
+          json: true,
+          file: None
+        },
         ..Flags::default()
       }
     );
@@ -2790,6 +2826,7 @@ mod tests {
       r.unwrap(),
       Flags {
         subcommand: DenoSubcommand::Info {
+          json: false,
           file: Some("https://example.com".to_string()),
         },
         ca_file: Some("example.crt".to_owned()),
diff --git a/cli/main.rs b/cli/main.rs
index 5c54a87ca..5a40a0da2 100644
--- a/cli/main.rs
+++ b/cli/main.rs
@@ -81,6 +81,7 @@ use crate::permissions::Permissions;
 use crate::tsc::TargetLib;
 use crate::worker::MainWorker;
 use deno_core::v8_set_flags;
+use deno_core::Deps;
 use deno_core::ErrBox;
 use deno_core::EsIsolate;
 use deno_core::ModuleSpecifier;
@@ -91,6 +92,7 @@ use futures::Future;
 use log::Level;
 use log::Metadata;
 use log::Record;
+use state::exit_unstable;
 use std::env;
 use std::io::Read;
 use std::io::Write;
@@ -140,22 +142,47 @@ fn write_to_stdout_ignore_sigpipe(bytes: &[u8]) -> Result<(), std::io::Error> {
   }
 }
 
-fn print_cache_info(state: &GlobalState) {
-  println!(
-    "{} {:?}",
-    colors::bold("DENO_DIR location:"),
-    state.dir.root
-  );
-  println!(
-    "{} {:?}",
-    colors::bold("Remote modules cache:"),
-    state.file_fetcher.http_cache.location
-  );
-  println!(
-    "{} {:?}",
-    colors::bold("TypeScript compiler cache:"),
-    state.dir.gen_cache.location
-  );
+fn write_json_to_stdout<T>(value: &T) -> Result<(), ErrBox>
+where
+  T: ?Sized + serde::ser::Serialize,
+{
+  let writer = std::io::BufWriter::new(std::io::stdout());
+  serde_json::to_writer_pretty(writer, value).map_err(ErrBox::from)
+}
+
+fn print_cache_info(state: &GlobalState, json: bool) -> Result<(), ErrBox> {
+  let deno_dir = &state.dir.root;
+  let modules_cache = &state.file_fetcher.http_cache.location;
+  let typescript_cache = &state.dir.gen_cache.location;
+  if json {
+    let output = json!({
+        "denoDir": deno_dir,
+        "modulesCache": modules_cache,
+        "typescriptCache": typescript_cache,
+    });
+    write_json_to_stdout(&output)
+  } else {
+    println!("{} {:?}", colors::bold("DENO_DIR location:"), deno_dir);
+    println!(
+      "{} {:?}",
+      colors::bold("Remote modules cache:"),
+      modules_cache
+    );
+    println!(
+      "{} {:?}",
+      colors::bold("TypeScript compiler cache:"),
+      typescript_cache
+    );
+    Ok(())
+  }
+}
+
+struct FileInfoOutput<'a> {
+  local: &'a str,
+  file_type: &'a str,
+  compiled: Option<String>,
+  map: Option<String>,
+  deps: Option<Deps>,
 }
 
 // TODO(bartlomieju): this function de facto repeats
@@ -163,6 +190,7 @@ fn print_cache_info(state: &GlobalState) {
 async fn print_file_info(
   worker: &MainWorker,
   module_specifier: ModuleSpecifier,
+  json: bool,
 ) -> Result<(), ErrBox> {
   let global_state = worker.state.borrow().global_state.clone();
 
@@ -171,17 +199,13 @@ async fn print_file_info(
     .fetch_source_file(&module_specifier, None, Permissions::allow_all())
     .await?;
 
-  println!(
-    "{} {}",
-    colors::bold("local:"),
-    out.filename.to_str().unwrap()
-  );
-
-  println!(
-    "{} {}",
-    colors::bold("type:"),
-    msg::enum_name_media_type(out.media_type)
-  );
+  let mut output = FileInfoOutput {
+    local: out.filename.to_str().unwrap(),
+    file_type: msg::enum_name_media_type(out.media_type),
+    compiled: None,
+    map: None,
+    deps: None,
+  };
 
   let module_specifier_ = module_specifier.clone();
 
@@ -208,12 +232,8 @@ async fn print_file_info(
       .ts_compiler
       .get_compiled_source_file(&out.url)
       .unwrap();
-
-    println!(
-      "{} {}",
-      colors::bold("compiled:"),
-      compiled_source_file.filename.to_str().unwrap(),
-    );
+    output.compiled =
+      compiled_source_file.filename.to_str().map(|s| s.to_owned());
   }
 
   if let Ok(source_map) = global_state
@@ -221,31 +241,48 @@ async fn print_file_info(
     .ts_compiler
     .get_source_map_file(&module_specifier)
   {
-    println!(
-      "{} {}",
-      colors::bold("map:"),
-      source_map.filename.to_str().unwrap()
-    );
+    output.map = source_map.filename.to_str().map(|s| s.to_owned());
   }
-
   let es_state_rc = EsIsolate::state(&worker.isolate);
   let es_state = es_state_rc.borrow();
 
   if let Some(deps) = es_state.modules.deps(&module_specifier) {
-    println!("{}{}", colors::bold("deps:\n"), deps.name);
-    if let Some(ref depsdeps) = deps.deps {
-      for d in depsdeps {
-        println!("{}", d);
+    output.deps = Some(deps);
+  }
+
+  if json {
+    let output = json!({
+      "local": output.local,
+      "fileType": output.file_type,
+      "compiled": output.compiled,
+      "map": output.map,
+      "deps": output.deps.map(|x| x.to_json())
+    });
+    write_json_to_stdout(&output)
+  } else {
+    println!("{} {}", colors::bold("local:"), output.local);
+    println!("{} {}", colors::bold("type:"), output.file_type);
+    if let Some(compiled) = output.compiled {
+      println!("{} {}", colors::bold("compiled:"), compiled);
+    }
+    if let Some(map) = output.map {
+      println!("{} {}", colors::bold("map:"), map);
+    }
+    if let Some(deps) = output.deps {
+      println!("{}{}", colors::bold("deps:\n"), deps.name);
+      if let Some(ref depsdeps) = deps.deps {
+        for d in depsdeps {
+          println!("{}", d);
+        }
       }
+    } else {
+      println!(
+        "{} cannot retrieve full dependency graph",
+        colors::bold("deps:"),
+      );
     }
-  } else {
-    println!(
-      "{} cannot retrieve full dependency graph",
-      colors::bold("deps:"),
-    );
+    Ok(())
   }
-
-  Ok(())
 }
 
 fn get_types(unstable: bool) -> String {
@@ -270,18 +307,21 @@ fn get_types(unstable: bool) -> String {
 async fn info_command(
   flags: Flags,
   file: Option<String>,
+  json: bool,
 ) -> Result<(), ErrBox> {
+  if json && !flags.unstable {
+    exit_unstable("--json");
+  }
   let global_state = GlobalState::new(flags)?;
   // If it was just "deno info" print location of caches and exit
   if file.is_none() {
-    print_cache_info(&global_state);
-    return Ok(());
+    print_cache_info(&global_state, json)
+  } else {
+    let main_module = ModuleSpecifier::resolve_url_or_path(&file.unwrap())?;
+    let mut worker = MainWorker::create(global_state, main_module.clone())?;
+    worker.preload_module(&main_module).await?;
+    print_file_info(&worker, main_module.clone(), json).await
   }
-
-  let main_module = ModuleSpecifier::resolve_url_or_path(&file.unwrap())?;
-  let mut worker = MainWorker::create(global_state, main_module.clone())?;
-  worker.preload_module(&main_module).await?;
-  print_file_info(&worker, main_module.clone()).await
 }
 
 async fn install_command(
@@ -525,8 +565,7 @@ async fn doc_command(
   };
 
   if json {
-    let writer = std::io::BufWriter::new(std::io::stdout());
-    serde_json::to_writer_pretty(writer, &doc_nodes).map_err(ErrBox::from)
+    write_json_to_stdout(&doc_nodes)
   } else {
     let details = if let Some(filter) = maybe_filter {
       let nodes =
@@ -691,7 +730,9 @@ pub fn main() {
     DenoSubcommand::Fmt { check, files } => {
       fmt::format(files, check).boxed_local()
     }
-    DenoSubcommand::Info { file } => info_command(flags, file).boxed_local(),
+    DenoSubcommand::Info { file, json } => {
+      info_command(flags, file, json).boxed_local()
+    }
     DenoSubcommand::Install {
       module_url,
       args,
diff --git a/cli/tests/055_info_file_json.out b/cli/tests/055_info_file_json.out
new file mode 100644
index 000000000..20bf94f3f
--- /dev/null
+++ b/cli/tests/055_info_file_json.out
@@ -0,0 +1,25 @@
+{
+  "local": "[WILDCARD]005_more_imports.ts",
+  "fileType": "TypeScript",
+  "compiled": "[WILDCARD]005_more_imports.ts.js",
+  "map": null,
+  "deps": [
+    "file://[WILDCARD]/005_more_imports.ts",
+    [
+      [
+        "file://[WILDCARD]/subdir/mod1.ts",
+        [
+          [
+            "file://[WILDCARD]/subdir/subdir2/mod2.ts",
+            [
+              [
+                "file://[WILDCARD]/subdir/print_hello.ts",
+                []
+              ]
+            ]
+          ]
+        ]
+      ]
+    ]
+  ]
+}
\ No newline at end of file
diff --git a/cli/tests/info_json.out b/cli/tests/info_json.out
new file mode 100644
index 000000000..361728a7b
--- /dev/null
+++ b/cli/tests/info_json.out
@@ -0,0 +1,5 @@
+{
+  "denoDir": "[WILDCARD]",
+  "modulesCache": "[WILDCARD]deps",
+  "typescriptCache": "[WILDCARD]gen"
+}
\ No newline at end of file
diff --git a/cli/tests/integration_tests.rs b/cli/tests/integration_tests.rs
index 9acb4ed3f..87a6f9d63 100644
--- a/cli/tests/integration_tests.rs
+++ b/cli/tests/integration_tests.rs
@@ -1499,6 +1499,11 @@ itest!(_041_info_flag {
   output: "041_info_flag.out",
 });
 
+itest!(info_json {
+  args: "info --json --unstable",
+  output: "info_json.out",
+});
+
 itest!(_042_dyn_import_evalcontext {
   args: "run --quiet --allow-read --reload 042_dyn_import_evalcontext.ts",
   output: "042_dyn_import_evalcontext.ts.out",
@@ -1552,6 +1557,12 @@ itest!(_054_info_local_imports {
   exit_code: 0,
 });
 
+itest!(_055_info_file_json {
+  args: "info --quiet --json --unstable 005_more_imports.ts",
+  output: "055_info_file_json.out",
+  exit_code: 0,
+});
+
 itest!(_056_make_temp_file_write_perm {
   args:
     "run --quiet --allow-read --allow-write=./subdir/ 056_make_temp_file_write_perm.ts",
diff --git a/core/lib.rs b/core/lib.rs
index 47ded645e..7358af1c4 100644
--- a/core/lib.rs
+++ b/core/lib.rs
@@ -36,6 +36,7 @@ pub use crate::es_isolate::EsIsolateState;
 pub use crate::flags::v8_set_flags;
 pub use crate::module_specifier::ModuleResolutionError;
 pub use crate::module_specifier::ModuleSpecifier;
+pub use crate::modules::Deps;
 pub use crate::modules::ModuleId;
 pub use crate::modules::ModuleLoadId;
 pub use crate::modules::ModuleLoader;
diff --git a/core/modules.rs b/core/modules.rs
index ca850d0bb..58ad767b9 100644
--- a/core/modules.rs
+++ b/core/modules.rs
@@ -484,20 +484,14 @@ impl Deps {
     }
   }
 
-  pub fn to_json(&self) -> String {
-    let mut children = "[".to_string();
-
-    if let Some(ref deps) = self.deps {
-      for d in deps {
-        children.push_str(&d.to_json());
-        if !d.is_last {
-          children.push_str(",");
-        }
-      }
+  pub fn to_json(&self) -> serde_json::Value {
+    let children;
+    if let Some(deps) = &self.deps {
+      children = deps.iter().map(|c| c.to_json()).collect();
+    } else {
+      children = Vec::new()
     }
-    children.push_str("]");
-
-    format!("[\"{}\",{}]", self.name, children)
+    serde_json::json!([&self.name, children])
   }
 }
 
@@ -1056,6 +1050,29 @@ mod tests {
     assert!(modules.deps(&specifier).is_none());
   }
 
+  #[test]
+  fn deps_to_json() {
+    fn dep(name: &str, deps: Option<Vec<Deps>>) -> Deps {
+      Deps {
+        name: name.to_string(),
+        deps,
+        prefix: "".to_string(),
+        is_last: false,
+      }
+    }
+    let deps = dep(
+      "a",
+      Some(vec![
+        dep("b", Some(vec![dep("b2", None)])),
+        dep("c", Some(vec![])),
+      ]),
+    );
+    assert_eq!(
+      serde_json::json!(["a", [["b", [["b2", []]]], ["c", []]]]),
+      deps.to_json()
+    );
+  }
+
   /* TODO(bartlomieju): reenable
   #[test]
   fn deps() {
@@ -1076,22 +1093,5 @@ mod tests {
     assert_eq!(bar_deps.deps, Some(vec![]));
   }
 
-  #[test]
-  fn test_deps_to_json() {
-    let mut modules = Modules::new();
-    modules.register(1, "foo");
-    modules.register(2, "bar");
-    modules.register(3, "baz");
-    modules.register(4, "zuh");
-    modules.add_child(1, "bar");
-    modules.add_child(1, "baz");
-    modules.add_child(3, "zuh");
-    let maybe_deps = modules.deps("foo");
-    assert!(maybe_deps.is_some());
-    assert_eq!(
-      "[\"foo\",[[\"bar\",[]],[\"baz\",[[\"zuh\",[]]]]]]",
-      maybe_deps.unwrap().to_json()
-    );
-  }
   */
 }