Fixed some minor errors (#137)

This PR fixed following issues in current grammar:
1. hide-env with flags

<img width="555" alt="image"
src="https://github.com/user-attachments/assets/f781c461-e753-4f32-9465-fe0c81a1817a">

2. do + closure + more than one arguments / parenthesized multiline do
statement

<img width="599" alt="image"
src="https://github.com/user-attachments/assets/4b9be6c1-8bf2-42b7-b512-89dff78099d1">

3. wrong result for multiline `expr_interpolated` (here `bar` should be
argument instead of the command head of another pipeline)

<img width="599" alt="image"
src="https://github.com/user-attachments/assets/f16ddabe-ff87-4410-b728-c5081daf00bf">

4. hide those `"\n"` terminal tokens, which makes it easier for query,
also more windows friendly.

grammar.js

@@ -38,7 +38,7 @@ module.exports = grammar({
 
     nu_script: ($) => seq(optional($.shebang), optional($._block_body)),
 
-    shebang: (_$) => seq("#!", /.*\n/),
+    shebang: (_$) => seq("#!", /.*\r?\n/),
 
     ...block_body_rules("", (/** @type {any} */ $) => $._terminator),
     ...block_body_rules("_last", (/** @type {any} */ $) =>
@@ -88,7 +88,7 @@ module.exports = grammar({
         field("dollar_name", $.val_variable),
       ),
 
-    _terminator: (_$) => choice(PUNC().semicolon, "\n"),
+    _terminator: (_$) => choice(PUNC().semicolon, /\r?\n/),
 
     /// Top Level Items
 
@@ -293,7 +293,7 @@ module.exports = grammar({
       choice(
         field("ctrl_break", KEYWORD().break),
         field("ctrl_continue", KEYWORD().continue),
-        $.ctrl_do,
+        alias($.ctrl_do_parenthesized, $.ctrl_do),
         alias($.ctrl_if_parenthesized, $.ctrl_if),
         alias($.ctrl_try_parenthesized, $.ctrl_try),
         $.ctrl_match,
@@ -334,27 +334,39 @@ module.exports = grammar({
       ),
 
     // Nestable Controls
+    _do_expression: ($) =>
+      choice(
+        $._list_item_expression,
+        $._flag,
+        alias($.unquoted, $.val_string),
+        alias($._unquoted_with_expr, $.val_string),
+      ),
 
     ctrl_do: ($) =>
       prec.left(
         -1,
         seq(
-          // `do` has 4 flags, is there a better way to do this?
           KEYWORD().do,
-          optional($._flag),
-          optional($._flag),
-          optional($._flag),
-          optional($._flag),
+          repeat($._flag),
           choice($._blosure, $.val_variable),
-          optional($._flag),
-          optional($._flag),
-          optional($._flag),
-          optional($._flag),
-          optional($._expression),
-          optional($._flag),
-          optional($._flag),
-          optional($._flag),
-          optional($._flag),
+          // optional to allow comment at the end
+          repeat(seq(token.immediate(/[ \t]+/), optional($._do_expression))),
+        ),
+      ),
+
+    ctrl_do_parenthesized: ($) =>
+      prec.left(
+        -1,
+        seq(
+          KEYWORD().do,
+          repeat($._flag),
+          choice($._blosure, $.val_variable),
+          repeat(
+            seq(
+              choice(/\r?\n/, token.immediate(/[ \t]+/)),
+              optional($._do_expression),
+            ),
+          ),
         ),
       ),
 
@@ -382,7 +394,7 @@ module.exports = grammar({
           field("then_branch", $.block),
           optional(
             seq(
-              optional("\n"),
+              optional(/\r?\n/),
               KEYWORD().else,
               choice(
                 field("else_block", choice($.block, $._expression, $.command)),
@@ -518,7 +530,7 @@ module.exports = grammar({
           field("try_branch", $.block),
           optional(
             seq(
-              optional("\n"),
+              optional(/\r?\n/),
               KEYWORD().catch,
               field("catch_branch", $._blosure),
             ),
@@ -555,8 +567,8 @@ module.exports = grammar({
           $.command,
         ),
         // Allow for empty pipeline elements like `ls | | print`
-        repeat1(seq(optional("\n"), PUNC().pipe)),
-        optional("\n"),
+        repeat1(seq(optional(/\r?\n/), PUNC().pipe)),
+        optional(/\r?\n/),
       ),
 
     pipe_element_parenthesized: ($) =>
@@ -568,8 +580,8 @@ module.exports = grammar({
           alias($._command_parenthesized_body, $.command),
         ),
         // Allow for empty pipeline elements like `ls | | print`
-        repeat1(seq(optional("\n"), PUNC().pipe)),
-        optional("\n"),
+        repeat1(seq(optional(/\r?\n/), PUNC().pipe)),
+        optional(/\r?\n/),
       ),
 
     pipe_element_last: ($) =>
@@ -626,7 +638,11 @@ module.exports = grammar({
       ),
 
     hide_env: ($) =>
-      seq(KEYWORD().hide_env, field("variable", $._variable_name)),
+      seq(
+        KEYWORD().hide_env,
+        repeat($._flag),
+        field("variable", $._variable_name),
+      ),
 
     _stmt_overlay: ($) =>
       choice($.overlay_hide, $.overlay_list, $.overlay_new, $.overlay_use),
@@ -1015,7 +1031,7 @@ module.exports = grammar({
       ),
 
     expr_interpolated: ($) =>
-      seq(BRACK().open_paren, $._block_body, BRACK().close_paren),
+      seq(BRACK().open_paren, $._parenthesized_body, BRACK().close_paren),
 
     /// Collections
 
@@ -1059,8 +1075,7 @@ module.exports = grammar({
       "_entry_separator",
     ),
 
-    _entry_separator: (_$) =>
-      token(prec(20, choice(PUNC().comma, /\s/, /[\r\n]/))),
+    _entry_separator: (_$) => token(prec(20, choice(PUNC().comma, /\s/))),
 
     record_entry: ($) =>
       seq(
@@ -1171,12 +1186,11 @@ module.exports = grammar({
             10,
             repeat(
               seq(
-                choice(token.immediate("\n"), token.immediate(/[ \t]+/)),
+                choice(/\r?\n/, token.immediate(/[ \t]+/)),
                 optional($._cmd_arg),
               ),
             ),
           ),
-          optional("\n"),
         ),
       ),