GNU bug report logs - #79893
Unify hideshow.el and hide-ifdef-mode

Message received at submit <at> debbugs.gnu.org:

Received: (at submit) by debbugs.gnu.org; 25 Nov 2025 20:31:49 +0000
From debbugs-submit-bounces <at> debbugs.gnu.org Tue Nov 25 15:31:49 2025
Received: from localhost ([127.0.0.1]:42309 helo=debbugs.gnu.org)
	by debbugs.gnu.org with esmtp (Exim 4.84_2)
	(envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>)
	id 1vNzhU-0004n7-NU
	for submit <at> debbugs.gnu.org; Tue, 25 Nov 2025 15:31:49 -0500
Received: from lists.gnu.org ([2001:470:142::17]:38502)
 by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.84_2) (envelope-from <eg642616@HIDDEN>)
 id 1vMyeo-0004sl-P6
 for submit <at> debbugs.gnu.org; Sat, 22 Nov 2025 20:12:51 -0500
Received: from eggs.gnu.org ([2001:470:142:3::10])
 by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <eg642616@HIDDEN>)
 id 1vMyee-00024A-Io
 for bug-gnu-emacs@HIDDEN; Sat, 22 Nov 2025 20:12:41 -0500
Received: from mail-ot1-x343.google.com ([2607:f8b0:4864:20::343])
 by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)
 (Exim 4.90_1) (envelope-from <eg642616@HIDDEN>)
 id 1vMyeX-00044e-87
 for bug-gnu-emacs@HIDDEN; Sat, 22 Nov 2025 20:12:38 -0500
Received: by mail-ot1-x343.google.com with SMTP id
 46e09a7af769-7c78d30649aso2279414a34.2
 for <bug-gnu-emacs@HIDDEN>; Sat, 22 Nov 2025 17:12:18 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=gmail.com; s=20230601; t=1763860333; x=1764465133; darn=gnu.org;
 h=mime-version:message-id:date:subject:to:from:from:to:cc:subject
 :date:message-id:reply-to;
 bh=EiB2Zgq/GqhWrxtoGdbZAvc0IRGGqbTOjio31w5XvnM=;
 b=UA5g4SUNs0oZYDrCQVat/s5qw90Mf18FDT/yKkxohACMOqUtVjkpAn4lScfRD/oBDo
 0SQCrjxSYF37+7YbID+uz71WcEeoTTBRA9kqP9odMLI/RAyt3QU1cUAnrWvHY+JMO8RP
 IRL0SKVubUgvW3A1VynoUEQxrhz4gARBG9312QAZhlYt9pARo8tNPGwLywZSx7DsldK8
 t6nJIZAxDyBoq4YVXE73ao28xnS0dyXIXoX6DzNuFQap6NpY0sjxwQYiFLoLhRdW3OhF
 pl2Nl5mKg/80PMv+4J3JOLwk4rRep3V8C5Cd0/GJ5RUiq1B0FTpwtosIt5/V3rtb2W1K
 c1TA==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20230601; t=1763860333; x=1764465133;
 h=mime-version:message-id:date:subject:to:from:x-gm-gg
 :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to;
 bh=EiB2Zgq/GqhWrxtoGdbZAvc0IRGGqbTOjio31w5XvnM=;
 b=sGyVi7fk7WBCz0vwZ83lAzjVc1J9kx6oMh3Zh8lXH+UOJyKM2R71FDQOVB8eO+iYMv
 jWZfQ729AMIRBvV1+Ll0+xKXDX/ElRyvZVyMLsku2CdeYdOq3OtZS14RNHgmdcndziAs
 DvapNGTDnAsmsRaIntTkp8LnKYJwXSVvQPtLWZypDnWD1XETSrFbETkit4CTQng7vAF6
 7m1mLh83bz8kEgUwhYQ6KWRVcTWRGXXkfqNmwRHY83Sbxj4htIVMtBbJJ1PuLbBrbAW5
 XzsUYpM7vGSTpH0AQ54lWaWPyjE/hXJQvWzQnwWbBAKmYogYQ43jpFN0gb9feK0y5OH1
 Y4PQ==
X-Gm-Message-State: AOJu0YwXbd2jDLK0kUl0SOPtviPRHr+a92WRGk17TMmBYo2lfsEOytCE
 7cMD6us8hBNbwrTCWf+I+dBVI13u37fFvVX864Fgy9YWrsrVDZ8UUrM5t89Bzo0N
X-Gm-Gg: ASbGnctzyKCAx6viBQynR8L0uv2vye/4ZaUhUkKns2ugQ9pA4nLcUowUGQa/CBIXaYx
 qfxG7xQL9Z49a5Em/E31+iQ7hOgkYuPbP6WbojsKQtuBoq9tFnS8UZE9G2G3Kuf+FLRutQqarRF
 85JT9ax9ZWvRg3kdo/Zn+wD0rcgHrMSq90/AgQRn4fNPkYbqM1B2D84eSCKBJi8faafgSfcYKNq
 pIS7cB4aFEONjCCJ6+zXzpZp1SXgj3jNwbD682U3DyWDZtepuFp8/I033ACHOwf0BFbuCMm0e39
 +e0cKChiSqJSnd81Ke84QlaDxMMUI8PkWwOtFpmAQ3Y0BQALO4BS0Yc3s+1pj2se706dyl5fF+V
 MZ9oz9DihKPQDsSVcVcX3tQj2f/7YfjKrSC6xIrxEyugrjsTNUuKzI2JtW1bMrHuqpflz2h3Hyf
 tFXmuc
X-Google-Smtp-Source: AGHT+IHTwupGz8bGR5m/22rTfovLFwrmKQWcWpK291A+ByZ2Byx5Glvj83DCIhdmU/Jkna36eUv6gg==
X-Received: by 2002:a05:6808:148f:b0:450:5e3a:6f1a with SMTP id
 5614622812f47-45115a2e7a0mr3069817b6e.20.1763860333403; 
 Sat, 22 Nov 2025 17:12:13 -0800 (PST)
Received: from fedora ([189.215.160.233]) by smtp.gmail.com with ESMTPSA id
 5614622812f47-450fffed253sm2746713b6e.20.2025.11.22.17.12.12
 for <bug-gnu-emacs@HIDDEN>
 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);
 Sat, 22 Nov 2025 17:12:12 -0800 (PST)
From: =?utf-8?Q?Elijah_Gabe_P=C3=A9rez?= <eg642616@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: Unify hideshow.el and hide-ifdef-mode
Date: Sat, 22 Nov 2025 19:12:10 -0600
Message-ID: <877bvhmu1h.fsf@HIDDEN>
MIME-Version: 1.0
Content-Type: text/plain
Received-SPF: pass client-ip=2607:f8b0:4864:20::343;
 envelope-from=eg642616@HIDDEN; helo=mail-ot1-x343.google.com
X-Spam_score_int: -17
X-Spam_score: -1.8
X-Spam_bar: -
X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,
 DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,
 FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001,
 RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,
 SPF_PASS=-0.001 autolearn=ham autolearn_force=no
X-Spam_action: no action
X-Spam-Score: 1.2 (+)
X-Spam-Report: Spam detection software, running on the system "debbugs.gnu.org",
 has NOT identified this incoming email as spam.  The original
 message has been attached to this so you can view it or label
 similar future email.  If you have any questions, see
 the administrator of that system for details.
 Content preview:  hideshow via tree-sitter supports hiding/showing #if\|def
 macros,
 however for non-treesit modes (c-mode and c++-mode) this is not available.
 I have been experimenting a bit with hide-ifdef-mode code and I have been
 able to implement this functionality for hideshow: 
 Content analysis details:   (1.2 points, 10.0 required)
 pts rule name              description
 ---- ---------------------- --------------------------------------------------
 -0.0 RCVD_IN_DNSWL_NONE     RBL: Sender listed at https://www.dnswl.org/,
 no trust [2001:470:142:0:0:0:0:17 listed in] [list.dnswl.org]
 1.0 SPF_SOFTFAIL           SPF: sender does not match SPF record (softfail)
 0.0 FREEMAIL_FROM          Sender email is commonly abused enduser mail
 provider (eg642616[at]gmail.com)
 0.2 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends
 in digit (eg642616[at]gmail.com)
 -0.0 SPF_HELO_PASS          SPF: HELO matches SPF record
X-Debbugs-Envelope-To: submit
X-BeenThere: debbugs-submit <at> debbugs.gnu.org
X-Mailman-Version: 2.1.18
Precedence: list
List-Id: <debbugs-submit.debbugs.gnu.org>
List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, 
 <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe>
List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/>
List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org>
List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help>
List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, 
 <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe>
Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org
Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
X-Spam-Score: 0.2 (/)

hideshow via tree-sitter supports hiding/showing #if\|def macros,
however for non-treesit modes (c-mode and c++-mode) this is not
available.

I have been experimenting a bit with hide-ifdef-mode code and I have
been able to implement this functionality for hideshow:

#+begin_src elisp
(defvar cc-hs-ifdef-regexp (concat hif-ifx-regexp "\\|" hif-elif-regexp "\\|" hif-else-regexp))

(setq-local hs-block-start-regexp (concat "\\s(\\|{\\|\"" "\\|" cc-hs-ifdef-regexp)
            hs-block-end-regexp (concat "\\s)\\|}\\|\"" "\\|" hif-endif-regexp)
            hs-forward-sexp-function (lambda (arg)
                                       (if (looking-at cc-hs-ifdef-regexp)
                                           (progn (hif-ifdef-to-endif)
                                                  (end-of-line))
                                         (forward-sexp arg))))
#+end_src

This may require simplify or move some hideif code to cc-mode.

What do you all think about this idea?

Thanks.

-- 
- E.G via Gnus and Org.