bug#67488: [PATCH] Fix typescript-ts-mode indentation for switch statements

[Noah Peart <noah.v.peart@gmail.com>]

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Tags: patch

* lisp/progmodes/typescript-ts-mode.el(typescript-ts-mode): Add indentation
rule for switch case and default keywords.

Bug: `typescript-ts-mode` is missing indentation rules for 'case' and
'default' keywords in switch statements.

Recipe to reproduce:
Copy the following code into a buffer:

    const foo = (x: string) => {
      switch (x) {
                  case "a":
                  console.log(x);
                  return 1;
    case "b":
      return 2;
                  case "c":
                  default:
                    return 0;
      }
    };

And call the following function to configure typescript-ts-mode and
indent the buffer

    (defun my-ts-indentation ()
      (interactive)
      (setq indent-tabs-mode nil)
      (setq typescript-ts-mode-indent-offset 2)
      (typescript-ts-mode)
      (indent-region (point-min) (point-max)))

The indentation for the 'case' and 'default' branches within the switch
statement should still be unchanged due to missing indent rules.
Bug applies to emacs 29 as well.


In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.33, cairo version 1.16.0) of 2023-11-27 built on noah-X580VD
Repository revision: 76cf700ecb78cb465bcd05ae2b2fb0d28e4d0aed
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Ubuntu 22.04.3 LTS

Configured using:
 'configure --prefix=/usr/local --with-modules --with-tree-sitter
--with-threads --with-x-toolkit=gtk3 --with-xwidgets --with-gnutls
--with-json --with-mailutils --with-jpeg --with-png --with-rsvg
--with-tiff --with-xml2 --with-xpm --with-imagemagick CC=gcc-12
CXX=gcc-12'

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From 97cbae39562233a6eb9f2393ad6556b8409a7eaa Mon Sep 17 00:00:00 2001
From: nverno <noah.v.peart@gmail.com>
Date: Mon, 27 Nov 2023 08:55:23 -0800
Subject: [PATCH] Fix typescript-ts-mode indentation for switch statements

* lisp/progmodes/typescript-ts-mode.el(typescript-ts-mode): Add indentation
rule for switch case and default keywords.
---
 lisp/progmodes/typescript-ts-mode.el            |  3 +++
 .../typescript-ts-mode-resources/indent.erts    | 17 +++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/lisp/progmodes/typescript-ts-mode.el b/lisp/progmodes/typescript-ts-mode.el
index 0503c724d36..7998b3740b6 100644
--- a/lisp/progmodes/typescript-ts-mode.el
+++ b/lisp/progmodes/typescript-ts-mode.el
@@ -107,6 +107,9 @@ typescript-ts-mode--indent-rules
      ((parent-is "member_expression") parent-bol typescript-ts-mode-indent-offset)
      ((parent-is "named_imports") parent-bol typescript-ts-mode-indent-offset)
      ((parent-is "statement_block") parent-bol typescript-ts-mode-indent-offset)
+     ((or (node-is "case")
+          (node-is "default"))
+      parent-bol typescript-ts-mode-indent-offset)
      ((parent-is "switch_case") parent-bol typescript-ts-mode-indent-offset)
      ((parent-is "switch_default") parent-bol typescript-ts-mode-indent-offset)
      ((parent-is "type_arguments") parent-bol typescript-ts-mode-indent-offset)
diff --git a/test/lisp/progmodes/typescript-ts-mode-resources/indent.erts b/test/lisp/progmodes/typescript-ts-mode-resources/indent.erts
index 20f423259b4..7b6185e0386 100644
--- a/test/lisp/progmodes/typescript-ts-mode-resources/indent.erts
+++ b/test/lisp/progmodes/typescript-ts-mode-resources/indent.erts
@@ -45,6 +45,23 @@ const foo = () => {
 };
 =-=-=
 
+Name: Switch statement
+
+=-=
+const foo = (x: string) => {
+  switch (x) {
+    case "a":
+      console.log(x);
+      return 1;
+    case "b":
+      return 2;
+    case "c":
+    default:
+      return 0;
+  }
+};
+=-=-=
+
 Code:
   (lambda ()
     (setq indent-tabs-mode nil)
-- 
2.34.1