Merge haskell-ts-mode in upstream

Merge haskell-ts-mode in upstream

[Pranshu Sharma via Emacs development discussions.]

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Hello emacskin,

Around Augest, I asked for this first, but I still had do deal with the
FSF bureaucracy, but now that is done (and I have made a lot of changes
to the mode), I think it's ready.

I've attached a file.

The repo is here: https://hg.bauherren.ovh/haskell-ts-mode/ , but I've
attached the main file.


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-- 
Pranshu Sharma <https://p.bauherren.ovh>

Re: Merge haskell-ts-mode in upstream

[Philip Kaludercic]

Pranshu Sharma via "Emacs development discussions."
Pranshu Sharma via "Emacs development discussions."
<emacs-devel@gnu.org> writes:

> Hello emacskin,
>
> Around Augest, I asked for this first, but I still had do deal with the
> FSF bureaucracy, but now that is done (and I have made a lot of changes
> to the mode), I think it's ready.

Hi, I have added Yuan Fu as I assume he is the most knowledgeable about
the Tree-Sitter aspects of the code.

> I've attached a file.
>
> The repo is here: https://hg.bauherren.ovh/haskell-ts-mode/ , but I've
> attached the main file.

I see that you have started a new repository.  Do you want us to mirror
your changes with all the commit history, or are you OK with us just
copying over the coded periodically whenever you want to update the code?

It might also make sense to move your package from NonGNU ELPA to GNU
ELPA, but that is not strictly related to this.

I'll take the opportunity to re-comment the code:

> ;;; haskell-ts-mode.el --- A treesit based major mode for haskell -*- lexical-binding:t -*-
>
> ;; Copyright (C) 2024  Pranshu Sharma
>
>
> ;; Author: Pranshu Sharma <pranshusharma366 at gmail>
> ;; URL: https://codeberg.org/pranshu/haskell-ts-mode

Is this URL still accurate?

> ;; Package-Requires: ((emacs "29.3"))
> ;; Version: 1
> ;; Keywords: languages, haskell
>
> ;; This program is free software; you can redistribute it and/or modify
> ;; it under the terms of the GNU General Public License as published by
> ;; the Free Software Foundation, either version 3 of the License, or
> ;; (at your option) any later version.
>
> ;; This program is distributed in the hope that it will be useful,
> ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
> ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> ;; GNU General Public License for more details.
>
> ;; You should have received a copy of the GNU General Public License
> ;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
>
> ;;; Commentary:
>
> ;; This is a major mode that uses treesitter to provide all the basic
> ;; major mode stuff, like indentation, font lock, etc...

I am not clear about this aspect of -ts-modes, but wouldn't it make
sense to link to the grammar that you tested the major mode against?

> ;;; Code:
>
> (require 'comint)
> (require 'treesit)
>
> (declare-function treesit-parser-create "treesit.c")
> (declare-function treesit-node-start "treesit.c")
> (declare-function treesit-node-parent "treesit.c")
> (declare-function treesit-node-prev-sibling "treesit.c")
> (declare-function treesit-node-next-sibling "treesit.c")
> (declare-function treesit-node-end "treesit.c")
> (declare-function treesit-node-child "treesit.c")
> (declare-function treesit-node-type "treesit.c")
>
> (defgroup haskell-ts-mode nil
>   "Group that contains haskell-ts-mode variables"
>   :group 'langs)

There is no such group, you probably meant `languages'?

>
> (defvar haskell-ts-font-lock-feature-list
>   `((comment str pragma parens)
>     (type definition function args)
>     (match keyword)
>     (otherwise signature type-sig)))
>
> (defcustom haskell-ts-use-indent t
>   "Set to non-nil to use the indentation provided by haskell-ts-mode"
>   :group 'haskell-ts-mode

You can drop the :group declarations, they automatically fall back to
the last `defgroup'.

>   :type 'boolean)
>
> (defcustom haskell-ts-font-lock-level 4
>   "Level of font lock, 1 for minimum highlghting and 4 for maximum."
>   :group 'haskell-ts-mode
>   :type 'integer)

It might even make sense to use a choice here, as not all integer values
are valid.

> (defvar haskell-ts-prettify-symbols-alist

Would it make sense for this to be a defconst?

>   '(("\\" . "λ")
>     ("/=" . "≠")
>     ("->" . "→")
>     ("=>" . "⇒")
>     ("<-" . "←")
>     ("<=" . "≥")
>     (">=" . "≤")))
>
> (defvar haskell-ts-font-lock
>   (treesit-font-lock-rules
>    :language 'haskell
>    :feature 'keyword
>    `(["module" "import" "data" "let" "where" "case" "type"
>       "if" "then" "else" "of" "do" "in" "instance" "class"]
>      @font-lock-keyword-face)
>    :language 'haskell
>    :feature 'otherwise
>    :override t
>    `(((match (guards guard: (boolean (variable) @font-lock-keyword-face)))
>       (:match "otherwise" @font-lock-keyword-face)))
>    :language 'haskell
>    :feature 'type-sig
>    "(signature (binding_list (variable) @font-lock-doc-markup-face))
>     (signature (variable) @font-lock-doc-markup-face)"
>    :language 'haskell
>    :feature 'args
>    :override 'keep
>    (concat
>     "(function (infix left_operand: (_) @haskell-ts--fontify-arg))"
>     "(function (infix right_operand: (_) @haskell-ts--fontify-arg))"
>     "(generator . (_) @haskell-ts--fontify-arg)"
>     "(bind (as (variable) . (_) @haskell-ts--fontify-arg))"
>     "(patterns) @haskell-ts--fontify-arg")
>    :language 'haskell
>    :feature 'type
>    `((type) @font-lock-type-face
>      (constructor) @font-lock-type-face)
>    :language 'haskell
>    :override t
>    :feature 'signature
>    `((signature (function) @haskell-ts--fontify-type)
>      (context (function) @haskell-ts--fontify-type))
>    :language 'haskell
>    :feature 'match
>    `((match ("|" @font-lock-doc-face) ("=" @font-lock-doc-face))
>      (list_comprehension ("|" @font-lock-doc-face
> 			  (qualifiers (generator "<-" @font-lock-doc-face))))
>      (match ("->" @font-lock-doc-face)))
>    :language 'haskell
>    :feature 'comment
>    `(((comment) @font-lock-comment-face)
>      ((haddock) @font-lock-doc-face))
>    :language 'haskell
>    :feature 'pragma
>    `((pragma) @font-lock-preprocessor-face
>      (cpp) @font-lock-preprocessor-face)
>    :language 'haskell
>    :feature 'str
>    :override t
>    `((char) @font-lock-string-face
>      (string) @font-lock-string-face
>      (quasiquote (quoter) @font-lock-type-face)
>      (quasiquote (quasiquote_body) @font-lock-preprocessor-face))
>    :language 'haskell
>    :feature 'parens
>    :override t
>    `(["(" ")" "[" "]"] @font-lock-operator-face
>      (infix operator: (_) @font-lock-operator-face))
>    :language 'haskell
>    :feature 'function
>    :override t
>    `((function name: (variable) @font-lock-function-name-face)
>      (function (infix (operator)  @font-lock-function-name-face))
>      (declarations (type_synomym (name) @font-lock-function-name-face))
>      (bind (variable) @font-lock-function-name-face)
>      (function (infix (infix_id (variable) @font-lock-function-name-face)))
>      (bind (as (variable) @font-lock-function-name-face))))
>   "The treesitter font lock settings for haskell.")
>
> (defun haskell-ts--stand-alone-parent (_ parent bol)
>   (save-excursion
>     (goto-char (treesit-node-start parent))
>     (let ((type (treesit-node-type parent)))
>       (if (and (not bol)
> 	       (or (looking-back "^[ \t]*" (line-beginning-position))
> 		   (seq-some
> 		    (lambda (kw) 
> 		      (string= type kw))
> 		    '("when" "where" "do" "let" "local_binds" "function"))))

Why are you using `seq-some' and not a faster primitive like `member'?
In this context, the behaviour should be the same, unless you are
expecting that `type' can be something else than a string?

> 	  (treesit-node-start parent)
> 	(haskell-ts--stand-alone-parent 1 (funcall
> 					   (if bol 'treesit-node-parent 'identity)
> 					   (treesit-node-parent parent))
> 					nil)))))
>
> (defvar haskell-ts--ignore-types
>   (regexp-opt '("comment" "cpp" "haddock"))
>   "Node types that will be ignored by indentation.")
>
> (defvar haskell-ts-indent-rules
>   (let* ((p-sib
> 	  (lambda (node arg)
> 	    (let* ((func (if arg
> 			     'treesit-node-prev-sibling
> 			   'treesit-node-next-sibling))

You probably want to sharp-quote these.

> 		   (n (funcall func	 node)))
                                   ^
                                   is the tab here intentional?

> 	      (while (and n (string-match haskell-ts--ignore-types
> 					  (treesit-node-type n)))
> 		(setq n (funcall func n)))
> 	      n)))
> 	 (p-prev-sib
> 	  (lambda (node _ _) (treesit-node-start (funcall p-sib node t))))
> 	 (p-n-prev (lambda (node) (funcall p-sib node t)))
> 	 (parent-first-child (lambda (_ parent _)
> 			       (treesit-node-start (treesit-node-child parent 0)))))
>     `((haskell
>        ((node-is "^cpp$") column-0 0)
>        ((parent-is "^comment$") column-0 0)
>        ((parent-is "^haddock$") column-0 0)
>        ((parent-is "^imports$") column-0 0)
>        ;; Infix
>        ((n-p-gp nil "infix" "infix")
> 	(lambda (_ node _)
> 	  (let ((first-inf nil))
> 	    (while (string= "infix"
> 			    (treesit-node-type
> 			     (setq node (treesit-node-parent node))))
> 	      (setq first-inf node))
> 	    (funcall ,parent-first-child nil first-inf nil)))
> 	0)
>        ((node-is "^infix$") ,parent-first-child 0)
>        
>        ;; Lambda
>        ((parent-is "^lambda\\(_case\\)?$") standalone-parent 2)
>
>        ((parent-is "^class_declarations$") prev-sibling 0)
>
>        ((node-is "^where$") parent 2)
>        
>        ;; in
>        ((node-is "^in$") parent 0)
>        
>        ((parent-is "qualifiers") parent 0)
>        
>        ;; list
>        ((node-is "^]$") parent 0)
>        ((parent-is "^list$") standalone-parent 2)
>        
>        ;; If then else
>        ((node-is "^then$") parent 2)
>        ((node-is "^else$") parent 2)
>
>        ((parent-is "^apply$") haskell-ts--stand-alone-parent 1)
>        ((node-is "^quasiquote$") grand-parent 2)
>        ((parent-is "^quasiquote_body$") (lambda (_ _ c) c) 0)
>        ((lambda (node parent bol)
> 	  (when-let ((n (treesit-node-prev-sibling node)))
> 	    (while (string= "comment" (treesit-node-type n))
> 	      (setq n (treesit-node-prev-sibling n)))
> 	    (string= "do" (treesit-node-type n))))
> 	haskell-ts--stand-alone-parent
> 	3)
>        ((parent-is "^do$") ,p-prev-sib 0)
>
>        ((parent-is "^alternatives$") ,p-prev-sib 0)
>
>        ;; prev-adaptive-prefix is broken sometimes
>        (no-node
> 	(lambda (_ _ _)
> 	  (save-excursion
> 	    (goto-char (line-beginning-position 0))
> 	    (back-to-indentation)
> 	    (point)))
> 	0)
>        
>        ((parent-is "^data_constructors$") parent 0)
>
>        ;; where
>        ((lambda (node _ _)
> 	  (let ((n (treesit-node-prev-sibling node)))
> 	    (while (string= "comment" (treesit-node-type n))
> 	      (setq n (treesit-node-prev-sibling n)))
> 	    (string= "where" (treesit-node-type n))))
> 	
> 	(lambda (_ b _)
> 	  (+ 1 (treesit-node-start (treesit-node-prev-sibling b))))
> 	3)
>        ((parent-is "local_binds\\|instance_declarations") ,p-prev-sib 0)
>        
>        ;; Match
>        ((lambda (node _ _)
> 	  (and (string= "match" (treesit-node-type node))
> 	       (string-match (regexp-opt '("patterns" "variable"))
> 			     (treesit-node-type (funcall ,p-n-prev node)))))
> 	standalone-parent 2)
>        
>        ((node-is "match") ,p-prev-sib 0)
>        ((parent-is "match") standalone-parent 2)
>        
>        ((parent-is "^haskell$") column-0 0)
>        ((parent-is "^declarations$") column-0 0)
>        
>        ((parent-is "^record$") standalone-parent 2)
>
>        ((parent-is "^exports$")
> 	(lambda (_ b _) (treesit-node-start (treesit-node-prev-sibling b)))
> 	0)
>        ((n-p-gp nil "signature" "foreign_import") grand-parent 3)
>        ((parent-is "^case$") standalone-parent 4)
>        ((node-is "^alternatives$")
> 	(lambda (_ b _)
> 	  (treesit-node-start (treesit-node-child b 0)))
> 	2)
>        ((node-is "^comment$")
> 	;; Indenting comments by priorites:
> 	;; 1. next relevent sibling if exists
> 	;; 2. previous relevent sibling if exists
> 	;; 3. parent
> 	;; (relevent means type not it haskell-ts--ignore-types)
> 	(lambda (node parent _)
> 	  (if-let ((next-sib (funcall ,p-sib node nil)))
> 	      (treesit-node-start next-sib)
> 	    (if-let ((prev-sib (funcall ,p-prev-sib node nil nil)))
> 		prev-sib
> 	      (treesit-node-start parent))))

It might be fun to rewrite this using pcase...

> 	0)
>        ;; Backup
>        (catch-all parent 2)))))
>
> ;; Copied from haskell-tng-mode, changed a bit
>
> (defvar haskell-ts-mode-syntax-table
>       (let ((table (make-syntax-table)))
> 	;; The defaults are mostly fine
> 	(mapc
> 	 (lambda (ls)
> 	   (mapc
> 	    (lambda (char)
> 	      (modify-syntax-entry char (car ls) table))
> 	    (cdr ls)))
> 	 '(("_" ?! ?_)
> 	   ("w" ?')
> 	   ;; Haskell has some goofy comment enders like C-q C-l
> 	   (">" 13 10 12 11)
> 	   ("_ 123" ?-)
> 	   ("(}1nb" ?\{)
> 	   ("){4nb" ?\})
> 	   ("<" ?#)
> 	   (">" ?\n)
> 	   ;; Special operaters
> 	   ("." ?\, ?\; ?@)
> 	   ("\"" ?\")
> 	   ("$`"  ?\`)))
> 	table))

Consider wrapping this in a `eval-when-compile' and perhaps re-writing
it with `dolist'.

> (defmacro haskell-ts-imenu-name-function (check-func)
>   `(lambda (node)
>      (let ((nn (treesit-node-child node 0 node)))
> 	 (if (funcall ,check-func node)
> 	 (if (string= (treesit-node-type nn) "infix")
> 	     (treesit-node-text (treesit-node-child nn 1))
> 	     (haskell-ts-defun-name node))
>        nil))))

You should clean up the indentation, you seem to have tabs in the code
made the code intended in a harder to read way on my machine.
>
> (defun haskell-ts-indent-defun (pos)
>   "Indent the current function."
>   (interactive "d")
>   (let ((node (treesit-node-at pos)))
>     (while (not (string-match
> 		 "^declarations$\\|haskell"
> 		 (treesit-node-type (treesit-node-parent node))))
>       (setq node (treesit-node-parent node)))
>     (indent-region (treesit-node-start node) (treesit-node-end node))))

Why is this function necessary, if we already have the general commands
for indenting a defun?  If it is, it should probably be explained in the
docstring.

> (defvar haskell-ts-mode-map
>   (define-keymap
>     "C-c C-c" 'haskell-ts-compile-region-and-go
>     "C-c C-r" 'haskell-ts-run-haskell
>     "C-M-q" 'haskell-ts-indent-defun)
>   "Map for haskell-ts-mode.")

I am guessing this should be a `defvar-keymap'.

>
> ;;;###autoload
> (define-derived-mode haskell-ts-mode prog-mode "haskell ts mode"
>   "Major mode for Haskell files using tree-sitter."
>   (unless (treesit-ready-p 'haskell)
>     (error "Tree-sitter for Haskell is not available"))
>   (treesit-parser-create 'haskell)
>   (setq-local treesit-defun-type-regexp "\\(?:\\(?:function\\|struct\\)_definition\\)")
>   ;; Indent
>   (when haskell-ts-use-indent
>     (setq-local treesit-simple-indent-rules haskell-ts-indent-rules)
>     (setq-local indent-tabs-mode nil))
>   ;; Comment
>   (setq-local comment-start "-- ")
>   (setq-local comment-use-syntax t)
>   (setq-local comment-start-skip "\\(?: \\|^\\)-+")
>   ;; Electric
>   (setq-local electric-pair-pairs
> 	      '((?` . ?`) (?\( . ?\)) (?{ . ?}) (?\" . ?\") (?\[ . ?\])))
>   ;; Navigation
>   (setq-local treesit-defun-name-function 'haskell-ts-defun-name)
>   (setq-local treesit-defun-type-regexp
> 	      ;; Since haskell is strict functional, any 2nd level
> 	      ;; entity is defintion
> 	      (cons ".+"
> 		    (lambda (node)
> 		      (and (not (string-match haskell-ts--ignore-types (treesit-node-type node)))
> 			   (string= "declarations" (treesit-node-type (treesit-node-parent node)))))))
>   (setq-local prettify-symbols-alist haskell-ts-prettify-symbols-alist)
>   ;; Imenu
>   (setq-local treesit-simple-imenu-settings
> 	      `((nil haskell-ts-imenu-func-node-p nil
> 		     ,(haskell-ts-imenu-name-function #'haskell-ts-imenu-func-node-p))
> 		("Signatures.." haskell-ts-imenu-sig-node-p nil
> 		 ,(haskell-ts-imenu-name-function #'haskell-ts-imenu-sig-node-p))
> 		("Data..." haskell-ts-imenu-data-type-p nil
> 		 (lambda (node)
> 		   (treesit-node-text (treesit-node-child node 1))))))
>   ;; font-lock
>   (setq-local treesit-font-lock-level haskell-ts-font-lock-level)
>   (setq-local treesit-font-lock-settings haskell-ts-font-lock)
>   (setq-local treesit-font-lock-feature-list
> 	      haskell-ts-font-lock-feature-list)
>   (treesit-major-mode-setup))
>
> (defun haskell-ts--fontify-arg (node &optional _ _ _)
>   (if (string= "variable" (treesit-node-type node))
>       (put-text-property
>        (treesit-node-start node)
>        (treesit-node-end node)
>        'face font-lock-variable-name-face)
>     (mapc 'haskell-ts--fontify-arg (treesit-node-children node))))
>
> (defun haskell-ts--fontify-type (node &optional _ _ _)
>   (let ((last-child (treesit-node-child node -1)))
>     (if (string= (treesit-node-type last-child) "function")
> 	(haskell-ts--fontify-type last-child)
>       (put-text-property
>        (treesit-node-start last-child)
>        (treesit-node-end last-child)
>        'face font-lock-variable-name-face))))
>
> (defun haskell-ts-imenu-node-p (regex node)
>   (and (string-match-p regex (treesit-node-type node))
>        (string= (treesit-node-type (treesit-node-parent node)) "declarations")))
>
> (defun haskell-ts-imenu-func-node-p (node)
>   (haskell-ts-imenu-node-p "function\\|bind" node))
>
> (defun haskell-ts-imenu-sig-node-p (node)
>   (haskell-ts-imenu-node-p "signature" node))
>
> (defun haskell-ts-imenu-data-type-p (node)
>   (haskell-ts-imenu-node-p "data_type" node))
>
> (defun haskell-ts-defun-name (node)
>   (treesit-node-text (treesit-node-child node 0)))
>
> (defun haskell-ts-compile-region-and-go (start end)
>   "Compile the text from START to END in the haskell proc."
>   (interactive "r")
>   (let ((hs (haskell-ts-haskell-session)))
>     (comint-send-string hs ":{\n")
>     (comint-send-region hs start end)

You should probably do something to ensure that the interval doesn't
contain ":}"?  I assume that this is something ghci specific, right?

>     (comint-send-string hs "\n:}\n")))
>
> (defun haskell-ts-run-haskell()
>   (interactive)
>   (pop-to-buffer-same-window
>    (if (comint-check-proc "*haskell*")
>        "*haskell*"
>      (make-comint "haskell" "ghci" nil buffer-file-name))))

1. Would it make sense to have a user option that allows customising
   this, in case someone uses Cabal, Stack or whatever else?

2. The regular haskell-mode has a `run-haskell' command that creates the
   same buffer name.  Assuming that it is not that unusual for people to
   have both installed, when trying out the one or the other, shouldn't
   you take some precaution to detect that scenario?

> (defun haskell-ts-haskell-session ()
>   (get-buffer-process "*haskell*"))
>
> (when (treesit-ready-p 'haskell)
>   (add-to-list 'auto-mode-alist '("\\.hs\\'" . haskell-ts-mode)))
>
> (provide 'haskell-ts-mode)
>
> ;;; haskell-ts-mode.el ends here

Re: Merge haskell-ts-mode in upstream

[Pranshu Sharma via Emacs development discussions.]

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Philip Kaludercic <philipk@posteo.net> writes:

> I see that you have started a new repository.  Do you want us to mirror
> your changes with all the commit history, or are you OK with us just
> copying over the coded periodically whenever you want to update the code?

Ok, it seems like I'll be sticking to git one anyway, since
git-hg-bridge or something doesn't work.  I am fine with using the old
repo.


>> ;; This is a major mode that uses treesitter to provide all the basic
>> ;; major mode stuff, like indentation, font lock, etc...
>
> I am not clear about this aspect of -ts-modes, but wouldn't it make
> sense to link to the grammar that you tested the major mode against?

Thanks, I added it.  For now I'll intentionally not state the version,
as it works with the latest, and I don't know how back it goes until it doesn't.

>
> You can drop the :group declarations, they automatically fall back to
> the last `defgroup'.

Wow, that's handy.

>>   :type 'boolean)
>>
>> (defcustom haskell-ts-font-lock-level 4
>>   "Level of font lock, 1 for minimum highlghting and 4 for maximum."
>>   :group 'haskell-ts-mode
>>   :type 'integer)
>
> It might even make sense to use a choice here, as not all integer values
> are valid.

From the customize manual, using the :options is only avialiable with
few :types, like hook and plist.  I don't think it works for numbers.

>> (defvar haskell-ts-prettify-symbols-alist ...)
>
> Would it make sense for this to be a defconst?
>

I don't think that's neccsary, the user might want to add/remove some
stuff

>> (defun haskell-ts--stand-alone-parent (_ parent bol)
>>   (save-excursion
>>     (goto-char (treesit-node-start parent))
>>     (let ((type (treesit-node-type parent)))
>>       (if (and (not bol)
>> 	       (or (looking-back "^[ \t]*" (line-beginning-position))
>> 		   (seq-some
>> 		    (lambda (kw) 
>> 		      (string= type kw))
>> 		    '("when" "where" "do" "let" "local_binds" "function"))))
>
> Why are you using `seq-some' and not a faster primitive like `member'?
> In this context, the behaviour should be the same, unless you are
> expecting that `type' can be something else than a string?

Thanks, change applied. 

> You probably want to sharp-quote these.
Yep
>
>> 		   (n (funcall func	 node)))
>                                    ^
>                                    is the tab here intentional?
thanks, dealt with.
>>        ((node-is "^comment$")
>> 	;; Indenting comments by priorites:
>> 	;; 1. next relevent sibling if exists
>> 	;; 2. previous relevent sibling if exists
>> 	;; 3. parent
>> 	;; (relevent means type not it haskell-ts--ignore-types)
>> 	(lambda (node parent _)
>> 	  (if-let ((next-sib (funcall ,p-sib node nil)))
>> 	      (treesit-node-start next-sib)
>> 	    (if-let ((prev-sib (funcall ,p-prev-sib node nil nil)))
>> 		prev-sib
>> 	      (treesit-node-start parent))))
>
> It might be fun to rewrite this using pcase...

It indeed was, wow

>> 	0)
>>        ;; Backup
>>        (catch-all parent 2)))))
>>
>> ;; Copied from haskell-tng-mode, changed a bit
>>
>
> Consider wrapping this in a `eval-when-compile' and perhaps re-writing
> it with `dolist'.

Good idea, that made the code way cleaner

> You should clean up the indentation, you seem to have tabs in the code
> made the code intended in a harder to read way on my machine.

Ok, I changed the tab width and indented whole page.  tell me if still a
problem.

>>
>> (defun haskell-ts-indent-defun (pos)
>>   "Indent the current function."
>>   (interactive "d")
>>   (let ((node (treesit-node-at pos)))
>>     (while (not (string-match
>> 		 "^declarations$\\|haskell"
>> 		 (treesit-node-type (treesit-node-parent node))))
>>       (setq node (treesit-node-parent node)))
>>     (indent-region (treesit-node-start node) (treesit-node-end node))))
>
> Why is this function necessary, if we already have the general commands
> for indenting a defun?  If it is, it should probably be explained in the
> docstring.

Haskell functions are not paren wrapped(opptionally they are), so when I
tested those functions don't work. C-M-h works, but the indentation is a
little different in treesitter based mode, it works differently in
incomplete sentences.  Meaning newline-indent would rarley be the final
indentation of any expression.  I think the reason is too techical to
include in docstring.

>> (defvar haskell-ts-mode-map
>>   (define-keymap
>>     "C-c C-c" 'haskell-ts-compile-region-and-go
>>     "C-c C-r" 'haskell-ts-run-haskell
>>     "C-M-q" 'haskell-ts-indent-defun)
>>   "Map for haskell-ts-mode.")
>
> I am guessing this should be a `defvar-keymap'.
>

Thanks, TIL

>>
>> (defun haskell-ts-compile-region-and-go (start end)
>>   "Compile the text from START to END in the haskell proc."
>>   (interactive "r")
>>   (let ((hs (haskell-ts-haskell-session)))
>>     (comint-send-string hs ":{\n")
>>     (comint-send-region hs start end)
>
> You should probably do something to ensure that the interval doesn't
> contain ":}"?

I don't get what you mean.

> I assume that this is something ghci specific, right?

Yeah, ghci requires special wrapping for multiline stuff.  This makes
sense, as both the functions are valid:
f x = x + 1
f x = n + 1
  where n = x + 2
ghci not smart enough to tell that a 'where' might come at end.

>>     (comint-send-string hs "\n:}\n")))
>>
>> (defun haskell-ts-run-haskell()
>>   (interactive)
>>   (pop-to-buffer-same-window
>>    (if (comint-check-proc "*haskell*")
>>        "*haskell*"
>>      (make-comint "haskell" "ghci" nil buffer-file-name))))
>
> 1. Would it make sense to have a user option that allows customising
>    this, in case someone uses Cabal, Stack or whatever else?

I have a lot to say about this: Haskell's eco system is something that
will have you scratching your head when sleeping.  Trying to support
these utilities is soft suacide.  This package provides a simple ghci
wrapper, and I don't want it to become too complex, and inturn hard to
maintain(these tools are diddy when it comes to backward compatibity)
and understand.  If someone wants to make a complex ghci wrapper which
can do all this, they could(but shouldn't, for the sake of mental
health).  This mode attempts ot provide syntax+indentation+imenu+
someminorstuff *fullstop*, not provide the whole hassle-less haskell
development experiance(even if it existed).  The current model is that
people just do `import`in ghc. iirc, no fancy cabal/stakc program exists
to start ghci with all the app loaded.  To haskell-ts-mode, haskell goes
as far as ghc, cabal and stack don't exist.

Wait, now that I read it, you meant an option to specify ghci
path(added).  I went on a rant as soon as I saw cabal, oh well...

> 2. The regular haskell-mode has a `run-haskell' command that creates the
>    same buffer name.  Assuming that it is not that unusual for people to
>    have both installed, when trying out the one or the other, shouldn't
>    you take some precaution to detect that scenario?

yes, that makes sense, I changed buffer name to *Inferior Haskell*.
Initially I wanted to name the functino run-haskell for consistancy(eg
run-php (in php-ts), run-scheme, etc...), but this is fine.

I attach new file, I have also pushed changes to codebrg repo.


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-- 
Pranshu Sharma <https://p.bauherren.ovh>

Re: Merge haskell-ts-mode in upstream

[Philip Kaludercic]

Pranshu Sharma <pranshu@bauherren.ovh> writes:

> Philip Kaludercic <philipk@posteo.net> writes:
>
>> I see that you have started a new repository.  Do you want us to mirror
>> your changes with all the commit history, or are you OK with us just
>> copying over the coded periodically whenever you want to update the code?
>
> Ok, it seems like I'll be sticking to git one anyway, since
> git-hg-bridge or something doesn't work.  I am fine with using the old
> repo.

Wait, I am confused.  The initial proposal was to add the package to
emacs.git, right?

>>>   :type 'boolean)
>>>
>>> (defcustom haskell-ts-font-lock-level 4
>>>   "Level of font lock, 1 for minimum highlghting and 4 for maximum."
>>>   :group 'haskell-ts-mode
>>>   :type 'integer)
>>
>> It might even make sense to use a choice here, as not all integer values
>> are valid.
>
> From the customize manual, using the :options is only avialiable with
> few :types, like hook and plist.  I don't think it works for numbers.

You could just use something of the form

 (choice (const :tag "Minimal Highlighting" 1) ...)

>> You should clean up the indentation, you seem to have tabs in the code
>> made the code intended in a harder to read way on my machine.
>
> Ok, I changed the tab width and indented whole page.  tell me if still a
> problem.

There still seem to be a few instances.  You can use whitespace-mode to
highlight them ICYDK.

>>>
>>> (defun haskell-ts-indent-defun (pos)
>>>   "Indent the current function."
>>>   (interactive "d")
>>>   (let ((node (treesit-node-at pos)))
>>>     (while (not (string-match
>>> 		 "^declarations$\\|haskell"
>>> 		 (treesit-node-type (treesit-node-parent node))))
>>>       (setq node (treesit-node-parent node)))
>>>     (indent-region (treesit-node-start node) (treesit-node-end node))))
>>
>> Why is this function necessary, if we already have the general commands
>> for indenting a defun?  If it is, it should probably be explained in the
>> docstring.
>
> Haskell functions are not paren wrapped(opptionally they are), so when I
> tested those functions don't work. C-M-h works, but the indentation is a
> little different in treesitter based mode, it works differently in
> incomplete sentences.  Meaning newline-indent would rarley be the final
> indentation of any expression.  I think the reason is too techical to
> include in docstring.

So regular C-M-h would just re-indent a single equation, while this
matches all equations that constitute a total definition?

>>> (defun haskell-ts-compile-region-and-go (start end)
>>>   "Compile the text from START to END in the haskell proc."
>>>   (interactive "r")
>>>   (let ((hs (haskell-ts-haskell-session)))
>>>     (comint-send-string hs ":{\n")
>>>     (comint-send-region hs start end)
>>
>> You should probably do something to ensure that the interval doesn't
>> contain ":}"?
>
> I don't get what you mean.

If you select a region in the buffer that would happen to include a

--8<---------------cut here---------------start------------->8---
:}
--8<---------------cut here---------------end--------------->8---

on one line, could this mess up the state of GHCi?

>>>     (comint-send-string hs "\n:}\n")))
>>>
>>> (defun haskell-ts-run-haskell()
>>>   (interactive)
>>>   (pop-to-buffer-same-window
>>>    (if (comint-check-proc "*haskell*")
>>>        "*haskell*"
>>>      (make-comint "haskell" "ghci" nil buffer-file-name))))
>>
>> 1. Would it make sense to have a user option that allows customising
>>    this, in case someone uses Cabal, Stack or whatever else?
>
> I have a lot to say about this: Haskell's eco system is something that
> will have you scratching your head when sleeping.  Trying to support
> these utilities is soft suacide.  This package provides a simple ghci
> wrapper, and I don't want it to become too complex, and inturn hard to
> maintain(these tools are diddy when it comes to backward compatibity)
> and understand.  If someone wants to make a complex ghci wrapper which
> can do all this, they could(but shouldn't, for the sake of mental
> health).  This mode attempts ot provide syntax+indentation+imenu+
> someminorstuff *fullstop*, not provide the whole hassle-less haskell
> development experiance(even if it existed).  The current model is that
> people just do `import`in ghc. iirc, no fancy cabal/stakc program exists
> to start ghci with all the app loaded.  To haskell-ts-mode, haskell goes
> as far as ghc, cabal and stack don't exist.

I don't have much experience with these tools, all I know is that there
are commands like "stack ghci" that might be something some people could
be interested in setting.

> Wait, now that I read it, you meant an option to specify ghci
> path(added).  I went on a rant as soon as I saw cabal, oh well...

I guess that should be fine as well.

>> 2. The regular haskell-mode has a `run-haskell' command that creates the
>>    same buffer name.  Assuming that it is not that unusual for people to
>>    have both installed, when trying out the one or the other, shouldn't
>>    you take some precaution to detect that scenario?
>
> yes, that makes sense, I changed buffer name to *Inferior Haskell*.
> Initially I wanted to name the functino run-haskell for consistancy(eg
> run-php (in php-ts), run-scheme, etc...), but this is fine.

If we move the code into the core, then I think it would be fair to add
such a function.  We shouldn't have to inconvenience users because of
third-party packages on NonGNU ELPA.

Also, you seem to have named the buffer "*Inferior haskell*" (lower
case) instead of "*Inferior Haskell*" in `haskell-ts-haskell-session'.
Perhaps you can pull out the string into a constant.

> I attach new file, I have also pushed changes to codebrg repo.

I think it would be someone with more Tree Sitter experience could take
a look at the code as well.  Perhaps we should make this more formal by
moving over to the bug tracker?

Re: Merge haskell-ts-mode in upstream

[Pranshu Sharma via Emacs development discussions.]

[-- Attachment #1: Type: text/plain, Size: 4592 bytes --]

Philip Kaludercic <philipk@posteo.net> writes:

> Pranshu Sharma <pranshu@bauherren.ovh> writes:
>
>> Philip Kaludercic <philipk@posteo.net> writes:
>>
>>> I see that you have started a new repository.  Do you want us to mirror
>>> your changes with all the commit history, or are you OK with us just
>>> copying over the coded periodically whenever you want to update the code?
>>
>> Ok, it seems like I'll be sticking to git one anyway, since
>> git-hg-bridge or something doesn't work.  I am fine with using the old
>> repo.
>
> Wait, I am confused.  The initial proposal was to add the package to
> emacs.git, right?

Yes, but iiuc it will still have own repo and emacs will just mirror it
or smth.

>>>>   :type 'boolean)
>>>>
>>>> (defcustom haskell-ts-font-lock-level 4
>>>>   "Level of font lock, 1 for minimum highlghting and 4 for maximum."
>>>>   :group 'haskell-ts-mode
>>>>   :type 'integer)
>>>
>>> It might even make sense to use a choice here, as not all integer values
>>> are valid.
>>
>> From the customize manual, using the :options is only avialiable with
>> few :types, like hook and plist.  I don't think it works for numbers.
>
> You could just use something of the form
>
>  (choice (const :tag "Minimal Highlighting" 1) ...)
>

Oh, that was simple...

>>> You should clean up the indentation, you seem to have tabs in the code
>>> made the code intended in a harder to read way on my machine.
>>
>> Ok, I changed the tab width and indented whole page.  tell me if still a
>> problem.
>
> There still seem to be a few instances.  You can use whitespace-mode to
> highlight them ICYDK.

('ICYDK' means "In case you didn't know", ICYDK)

>>>> (defun haskell-ts-indent-defun (pos)
>>>>   "Indent the current function."
>>>>   (interactive "d")
>>>>   (let ((node (treesit-node-at pos)))
>>>>     (while (not (string-match
>>>> 		 "^declarations$\\|haskell"
>>>> 		 (treesit-node-type (treesit-node-parent node))))
>>>>       (setq node (treesit-node-parent node)))
>>>>     (indent-region (treesit-node-start node) (treesit-node-end node))))
>>>
>>> Why is this function necessary, if we already have the general commands
>>> for indenting a defun?  If it is, it should probably be explained in the
>>> docstring.
>>
>> Haskell functions are not paren wrapped(opptionally they are), so when I
>> tested those functions don't work. C-M-h works, but the indentation is a
>> little different in treesitter based mode, it works differently in
>> incomplete sentences.  Meaning newline-indent would rarley be the final
>> indentation of any expression.  I think the reason is too techical to
>> include in docstring.
>
> So regular C-M-h would just re-indent a single equation, while this
> matches all equations that constitute a total definition?

Not really, it is mostly convince for C-M-h TAB, but since it is meant ot be
used a lot, it get it's own special binding.  The rules are tiny bit
different.

>>>> (defun haskell-ts-compile-region-and-go (start end)
>>>>   "Compile the text from START to END in the haskell proc."
>>>>   (interactive "r")
>>>>   (let ((hs (haskell-ts-haskell-session)))
>>>>     (comint-send-string hs ":{\n")
>>>>     (comint-send-region hs start end)
>>>
>>> You should probably do something to ensure that the interval doesn't
>>> contain ":}"?
>>
>> I don't get what you mean.
>
> If you select a region in the buffer that would happen to include a
>
> :}
>
> on one line, could this mess up the state of GHCi?

Turns out it does, the only time this is valid suntax is in quasiquote
and multiline comment.  I kinda expected ghci to be smart enough to
handle it, but I did it now

>>>>     (comint-send-string hs "\n:}\n")))
>>>>

[37 lines omitted]
>>
>> yes, that makes sense, I changed buffer name to *Inferior Haskell*.
>> Initially I wanted to name the functino run-haskell for consistancy(eg
>> run-php (in php-ts), run-scheme, etc...), but this is fine.
>
> If we move the code into the core, then I think it would be fair to add
> such a function.  We shouldn't have to inconvenience users because of
> third-party packages on NonGNU ELPA.

I agree with this.

> Also, you seem to have named the buffer "*Inferior haskell*" (lower
> case) instead of "*Inferior Haskell*" in `haskell-ts-haskell-session'.
> Perhaps you can pull out the string into a constant.

Done

>> I attach new file, I have also pushed changes to codebrg repo.
>
> I think it would be someone with more Tree Sitter experience could take
> a look at the code as well.  Perhaps we should make this more formal by
> moving over to the bug tracker?

Sounds good.


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-- 
Pranshu Sharma <https://p.bauherren.ovh>