GNU bug report logs - #71407
30.0.50; Support arrays in json-ts-mode's imenu support

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From: Tassilo Horn <tsdh@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 30.0.50; Support arrays in json-ts-mode's imenu support
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json-ts-mode adds imenu support for JSON files which is quite handy.
However, it doesn't support arrays (e.g., [...]) which reduces its
utility quite a bit.

Here is an example JSON file with an array:

--8<---------------cut here---------------start------------->8---
{
  "root": [
    {
      "foo": 1,
      "bar": "test1"
    },
    {
      "foo": 2,
      "bar": "test2"
    }
  ]
}
--8<---------------cut here---------------end--------------->8---

The Imenu *Completions* buffer with imenu-flatten set to t is:

--8<---------------cut here---------------start------------->8---
Click or type M-RET on a completion to select it.
Type M-<down> or M-<up> to move point between completions.

6 possible completions:
*Rescan* 	root:. 	root:bar
root:foo
--8<---------------cut here---------------end--------------->8---

Aha aha, 6 completions but only 4 are displayed because root:foo and
root:bar are basically there twice:

--8<---------------cut here---------------start------------->8---
imenu--index-alist is a variable defined in =E2=80=98imenu.el=E2=80=99.

Its value is
(("root" (" " . #<marker at 5 in test.json>)
  ("foo" . #<marker at 27 in test.json>)
  ("bar" . #<marker at 43 in test.json>)
  ("foo" . #<marker at 77 in test.json>)
  ("bar" . #<marker at 93 in test.json>)))
Local in buffer test.json; global value is nil
--8<---------------cut here---------------end--------------->8---

Well, but even if they were displayed twice, I wouldn't be able to know
which leads to the first and which to the second object's foo or bar.

In an ideal world, arrays would produce numerically indexed intermediate
nodes, e.g., I would have

  root:[0]:foo
  root:[0]:bar
  root:[1]:foo
  root:[1]:bar

Is that feasible?  AFAICS, the only Imenu thing json-ts-mode does is
defining

    ;; Imenu.
    (setq-local treesit-simple-imenu-settings
                '((nil "\\`pair\\'" nil nil)))


In GNU Emacs 30.0.50 (build 17, x86_64-pc-linux-gnu, GTK+ Version
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Repository revision: 6906ed28f1b4ac0cf0a2a725e7402290f33c26e2
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