[nongnu] elpa/haskell-tng-mode bf24329 001/385: going nova

[ELPA Syncer]

branch: elpa/haskell-tng-mode
commit bf24329f03f8c90b4118cb768c417a3485372dab
Author: Tseen She <ts33n.sh3@gmail.com>
Commit: Tseen She <ts33n.sh3@gmail.com>

    going nova
---
 .gitignore               |   3 +
 COPYING                  | 674 +++++++++++++++++++++++++++++++++++++++++++++++
 Cask                     |  30 +++
 README.md                |  87 ++++++
 haskell-tng-font-lock.el |  85 ++++++
 haskell-tng-mode.el      |  63 +++++
 haskell-tng-syntax.el    |  96 +++++++
 7 files changed, 1038 insertions(+)

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ed55a4c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.elc
+.cask
+*-pkg.el
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
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+  If the Program specifies that a proxy can decide which future
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+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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 <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/Cask b/Cask
new file mode 100644
index 0000000..26fb0f0
--- /dev/null
+++ b/Cask
@@ -0,0 +1,30 @@
+;;-*- Mode: Lisp -*-
+
+;; Copyright (C) 2018 Tseen She
+;; License: GPL 3 or any later version
+
+;;; Commentary:
+;;
+;;  See http://cask.readthedocs.org for information about Cask.
+;;
+;;    cask pkg-file
+;;
+;;    cask update
+;;    cask install
+;;
+;;  are particularly useful commands.
+;;
+;; To run the tests:
+;;    cask exec ert-runner
+;;
+;;; Code:
+
+(source melpa-stable)
+
+(package-file "haskell-tng-mode.el")
+
+(development
+ (depends-on "ert-runner")
+ (depends-on "undercover"))
+
+;;; Cask ends here
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ad3fc08
--- /dev/null
+++ b/README.md
@@ -0,0 +1,87 @@
+# Haskell Mode: The Next Generation
+
+This is an exploratory alternative to 
[`haskell-mode`](https://github.com/haskell/haskell-mode/) that answers the 
question
+
+> How would we support Haskell in GNU Emacs if we started today?
+
+## Why?
+
+`haskell-mode` is almost 30 years old and has accumulated more than 25,000 
lines of code. Nobody wants to maintain that.
+
+The GNU Emacs ecosystem has evolved to provide many features that 
`haskell-mode` independently implemented, such as 
[`projectile`](https://github.com/bbatsov/projectile), 
[`comint-mode`](https://masteringemacs.org/article/comint-writing-command-interpreter),
 [`highlight-symbol`](https://melpa.org/##/highlight-symbol), 
[`company-mode`](http://company-mode.github.io), 
[`yasnippet`](http://joaotavora.github.io/yasnippet/), 
[`polymode`](https://github.com/polymode/polymode), [`smartparens`]( [...]
+
+## Approach
+
+The goal of this friendly fork is to produce software that any Haskell 
developer can use, understand and build upon ([Emacs 
Lisp](https://www.gnu.org/software/emacs/manual/elisp.html) is fun to learn).
+
+This can be achieved by preferring a simple and small codebase targeting 
[Haskell2010](https://www.haskell.org/onlinereport/haskell2010/), with 
automated tests for every feature.
+
+Old versions of `ghc` and extensions to the Haskell language may not be 
supported, to reduce the complexity of the codebase. For example, [literate 
Haskell](https://wiki.haskell.org/Literate_programming) will not be supported, 
and `ghc` language extensions must be justified on a per-case basis.
+
+If it is possible to implement a feature using another minor mode, or command 
line tool, then we would prefer not to accept the feature.
+
+## Issue Tracker
+
+Bug reports and feature requests are a source of anxiety for maintainers, and 
encourage an unhealthy customer / supplier relationship between users and 
contributors.
+
+Instead, and following the [anarchical spirit of 
Haskell](https://www.microsoft.com/en-us/research/wp-content/uploads/2016/07/history.pdf),
 we encourage discussions and debate around code contributions. Merge requests 
can be raised by anybody and discussed by anybody. If the maintainers are 
convinced by the technical merit and quality of a proposal, they may accept it.
+
+## Install
+
+Check out the source code repository, type `cask build`, and add to your load 
path:
+
+```lisp
+(add-to-list 'load-path (expand-file-name "~/Projects/haskell-mode"))
+(require 'haskell-mode-autoloads)
+```
+
+There are no plans to distribute any other way: this encourages contributor 
engagement.
+
+## Plan
+
+This is the status of core features:
+
+- Navigation:
+  - [x] performance-minded `syntax-table`
+  - [ ] `font-lock` to visually distinguish types and values
+  - [ ] `sexp` navigation (SMIE)
+  - [ ] `projectile` / [`fast-tags`](https://github.com/elaforge/fast-tags) 
integration for `TAGS`
+  - [ ] hoogle CLI jump-to-source
+  - [ ] `imenu` population
+- Editing:
+  - [ ] indentation (SMIE)
+  - [ ] `abbrev` table
+  - [ ] `yasnippet` templates
+  - [ ] `smartparens` compatibility (or something from stdlib)
+  - [ ] `LANGUAGE` management
+  - [ ] `import` management
+- Compiling:
+  - [ ] `haskell-compile` for build tool agnostic interaction with `ghc`
+  - [ ] `comint-mode` based `ghc` repl
+
+Compatibility with `lsp-mode` / 
[`haskell-ide-engine`](https://github.com/haskell/haskell-ide-engine) is 
important for more advanced IDE features.
+
+## Future Plans
+
+Some blue sky features are being considered but may be best as independent 
projects:
+
+- `.cabal` editing / navigation
+- [`.hie`](https://ghc.haskell.org/trac/ghc/wiki/HIEFiles) files as a parser 
backend and many type based queries.
+- lightweight interactive commands ([`dante`](https://github.com/jyp/dante) / 
[`intero`](https://github.com/commercialhaskell/intero)) (or perhaps redundant 
with `.hie`).
+  - `:type` at point
+  - `:browse` `company-backend`
+  - `:doc` at point
+- [`flycheck`](http://www.flycheck.org/en/latest/) integration with 
`haskell-compile`
+  - and [`hlint`](https://github.com/ndmitchell/hlint)
+  - and for faster feedback, [`ghcid`](https://github.com/ndmitchell/ghcid)
+- [visualise values as 
types](https://twitter.com/jyothsnasrin/status/1039530556080283648)
+- [`djinn`](https://hackage.haskell.org/package/djinn) / 
[`justdoit`](https://hackage.haskell.org/package/ghc-justdoit) integration
+- is there a solution to thinking "right to left" vs writing "left to right"?
+- identify trivial / helper functions and forward their `edit-definition` to 
another location.
+- Code gen
+  - two spaces after an `import` converts to the missing `qualified` (or is 
this indentation?)
+  - `instance` boilerplate
+- Refactoring
+  - be compatible with 
[`apply-refact`](https://github.com/mpickering/apply-refact) / 
[`hlint-refactor-mode`](https://github.com/mpickering/hlint-refactor-mode)
+  - convert wildcard import to explicit list
+  - insert explicit list of exports
diff --git a/haskell-tng-font-lock.el b/haskell-tng-font-lock.el
new file mode 100644
index 0000000..308da8c
--- /dev/null
+++ b/haskell-tng-font-lock.el
@@ -0,0 +1,85 @@
+;;; haskell-tng-font-lock.el --- Fontification for Haskell -*- 
lexical-binding: t -*-
+
+;; Copyright (C) 2018 Tseen She
+;; License: GPL 3 or any later version
+
+;;; Commentary:
+;;
+;;  A fontification scheme for Haskell with a goal to visually differentiate
+;;  between values and types, requiring multi-line analysis.
+;;
+;;  The detection of complex language constructs is not considered, for
+;;  simplicity and speed. Maybe one day we could use
+;;  https://github.com/tree-sitter/tree-sitter-haskell for 100% accurate
+;;  parsing, but until that day, we do it the idiomatic Emacs way (with hacks
+;;  and more hacks).
+;;
+;;  
https://www.gnu.org/software/emacs/manual/html_mono/elisp.html#Font-Lock-Mode
+;;
+;;; Code:
+
+(defgroup haskell-tng-font-lock:faces nil
+  "Haskell font faces."
+  :group 'haskell-tng)
+
+(defface haskell-tng-font-lock:keyword
+  '((t :inherit font-lock-keyword-face))
+  "Haskell reserved names and operators."
+  :group 'haskell-tng-font-lock:faces)
+
+(defface haskell-tng-font-lock:package
+  '((t :inherit font-lock-variable-name-face :weight bold))
+  "Haskell packages."
+  :group 'haskell-tng-font-lock:faces)
+
+(defface haskell-tng-font-lock:type
+  '((t :inherit font-lock-type-face))
+  "Haskell types."
+  :group 'haskell-tng-font-lock:faces)
+
+(defface haskell-tng-font-lock:constructor
+  '((t :inherit font-lock-constant-face))
+  "Haskell constructors."
+  :group 'haskell-tng-font-lock:faces)
+
+;; TODO: types (signatures, classes and imports)
+;;
+;; TODO: pragmas
+;;
+;; TODO: numeric / char primitives?
+
+;; FIXME: consider using rx instead of regexes... there are a lot of escapes
+;; that obfuscate the meaning, plus we could use DRY.
+
+(setq
+ haskell-tng-font-lock:keywords
+ `((,(regexp-opt '("case" "class" "data" "default" "deriving" "do" "else"
+                   "foreign" "if" "import" "in" "infix" "infixl"
+                   "infixr" "instance" "let" "module" "newtype" "of"
+                   "then" "type" "where" "_")
+                 'words)
+    . 'haskell-tng-font-lock:keyword) ;; reservedid
+   (,(regexp-opt '(".." ":" "::" "=" "|" "<-" ">" "->" "@" "~" "=>")
+                 'symbols)
+    . 'haskell-tng-font-lock:keyword) ;; reservedop
+   ;; lambda syntax may be followed by a trailing symbol
+   ("\\_<\\(\\\\\\)" . 'haskell-tng-font-lock:keyword)
+
+   ;; TODO: contextual / multiline support for the import region.
+   ;; qualified/hiding/as are keywords when used in imports
+   ("\\_<import\\_>[[:space:]]+\\_<\\(qualified\\)\\_>" 1 
'haskell-tng-font-lock:keyword)
+   ("\\_<import\\_>[^(]+?\\_<\\(hiding\\|as\\)\\_>" 1 
'haskell-tng-font-lock:keyword)
+   
("\\_<import\\_>\\(?:[[:space:]]\\|qualified\\)+\\_<\\([[:upper:]]\\(?:\\.\\|\\w\\)*\\)\\_>"
+    1 'haskell-tng-font-lock:package)
+   ("\\_<import\\_>[^(]+?\\_<as[[:space:]]+\\([[:upper:]]\\w+\\)"
+    1 'haskell-tng-font-lock:package)
+
+   ("\\_<\\(\\(?:[[:upper:]]\\w*\\.\\)+\\)"
+    . 'haskell-tng-font-lock:package) ;; uses of F.Q.N.s
+
+   ("\\_<\\([[:upper:]]\\w*\\)\\_>" 0 'haskell-tng-font-lock:constructor) ;; 
conid
+   ("\\_<\\(:\\s_+\\)\\_>" 0 'haskell-tng-font-lock:constructor) ;; consym
+   ))
+
+(provide 'haskell-tng-font-lock)
+;;; haskell-tng-font-lock.el ends here
diff --git a/haskell-tng-mode.el b/haskell-tng-mode.el
new file mode 100644
index 0000000..cf9bdee
--- /dev/null
+++ b/haskell-tng-mode.el
@@ -0,0 +1,63 @@
+;;; haskell-tng-mode.el --- Major mode for editing Haskell -*- 
lexical-binding: t -*-
+
+;; Copyright (C) 2018 Tseen She
+;; License: GPL 3 or any later version
+
+;; Homepage: https://gitlab.com/tseenshe/haskell-tng-mode
+;; Keywords: languages
+;; Package-Version: 0.0.1
+;; Package-Requires: ((dash "2.14.1"))
+
+;;; Commentary:
+;;
+;;  A modern rewrite of `haskell-mode'.
+;;
+;;; Code:
+
+(require 'dabbrev)
+(require 'haskell-tng-syntax)
+(require 'haskell-tng-font-lock)
+
+;;;###autoload
+(define-derived-mode haskell-tng-mode prog-mode "Hask"
+  "Major mode for editing Haskell programs."
+  :group 'haskell-tng
+  :syntax-table haskell-tng-syntax:table
+
+  ;; TODO paragraph-start, paragraph-separate, fill-paragraph-function
+  ;;
+  ;; TODO comment-start, comment-padding, comment-start-skip, comment-end,
+  ;;      comment-end-skip, comment-auto-fill-only-comments, 
parse-sexp-ignore-comments
+  ;;
+  ;; (it is annoying that we specify comments here AND in the syntax table)
+
+  (setq
+   ;; TAB is evil
+   indent-tabs-mode nil
+
+   ;; case-sensitive language
+   dabbrev-case-fold-search nil
+   dabbrev-case-distinction nil
+   dabbrev-case-replace nil
+
+   words-include-escapes t
+   syntax-propertize-function #'haskell-tng-syntax:propertize
+   parse-sexp-lookup-properties t
+
+   font-lock-defaults '(haskell-tng-font-lock:keywords
+                        nil nil nil)
+
+   ;; whitespace is meaningful, no electric indentation
+   electric-indent-inhibit t))
+
+(defcustom haskell-tng-mode-hook nil
+  "List of functions to run after `haskell-tng-mode' is enabled."
+  :group 'haskell-tng
+  :type 'hook)
+
+;; (progn
+;;   (add-to-list 'auto-mode-alist '("\\.hs\\'" . haskell-tng-mode))
+;;   (modify-coding-system-alist 'file "\\.hs\\'" 'utf-8))
+
+(provide 'haskell-tng-mode)
+;;; haskell-tng-mode.el ends here
diff --git a/haskell-tng-syntax.el b/haskell-tng-syntax.el
new file mode 100644
index 0000000..fbb9d17
--- /dev/null
+++ b/haskell-tng-syntax.el
@@ -0,0 +1,96 @@
+;;; haskell-tng-syntax.el --- Syntax Table for Haskell -*- lexical-binding: t 
-*-
+
+;; Copyright (C) 2018 Tseen She
+;; License: GPL 3 or any later version
+
+;;; Commentary:
+;;
+;;  A grossly simplified description of the Haskell language providing fast
+;;  editor commands and visual feedback. Defer advanced analysis to later 
stages
+;;  such as font-lock and SMIE lexing / parsing, where it is needed.
+;;
+;;  
https://www.gnu.org/software/emacs/manual/html_mono/elisp.html#Syntax-Tables
+;;
+;;; Code:
+
+(require 'dash)
+
+(defvar haskell-tng-syntax:table
+  (let ((table (make-syntax-table)))
+    (map-char-table
+     #'(lambda (k v)
+         ;; reset the (surprisingly numerous) defaults
+         (let ((class (syntax-class v)))
+           (when (-contains? '(1 4 5 6 9) class)
+             (modify-syntax-entry k "_" table))))
+     (char-table-parent table))
+
+    ;; many of the following chars are already defined by the defaults, but we
+    ;; repeat them (at least ASCII) to explicitly match Haskell2010 section 
2.2.
+    ;; Chars that appear in multiple classes are only assigned to the final
+    ;; class they are given.
+
+    ;; whitechar
+    (--each (string-to-list "\r\n\f\v \t")
+      (modify-syntax-entry it " " table))
+
+    ;; ascSymbol
+    (--each (string-to-list "!#$%&*+./<=>?@\\^|-~:")
+      (modify-syntax-entry it "_" table))
+
+    ;; small (underscore is a lowercase letter)
+    (modify-syntax-entry ?_ "w" table)
+
+    ;; some special (treated like punctuation)
+    (--each (string-to-list ",;")
+      (modify-syntax-entry it "." table))
+
+    ;; apostrophe as a symbol, not delimiter
+    (modify-syntax-entry ?\' "_" table)
+
+    ;; string delimiter
+    (modify-syntax-entry ?\" "\"" table)
+
+    ;; parens and pairs (infix functions)
+    (modify-syntax-entry ?\( "()" table)
+    (modify-syntax-entry ?\) ")(" table)
+    (modify-syntax-entry ?\[ "(]" table)
+    (modify-syntax-entry ?\] ")[" table)
+    (modify-syntax-entry ?\` "$`" table)
+
+    ;; comments (subsuming pragmas)
+    (modify-syntax-entry ?\{  "(}1nb" table)
+    (modify-syntax-entry ?\}  "){4nb" table)
+    (modify-syntax-entry ?-  "_ 123" table)
+    (--each (string-to-list "\r\n\f\v")
+      (modify-syntax-entry it ">" table))
+
+    table)
+  "Haskell syntax table.")
+
+(defun haskell-tng-syntax:propertize (start end)
+  "For some context-sensitive syntax entries."
+  (haskell-tng-syntax:propertize-char-delims start end)
+  (haskell-tng-syntax:propertize-escapes start end))
+
+(defun haskell-tng-syntax:propertize-char-delims (start end)
+  "Matching apostrophes are string delimiters (literal chars)."
+  (save-excursion
+    (goto-char start)
+    (while (re-search-forward "'\\\\?.'" end t)
+      (let ((open (match-beginning 0))
+            (close (- (point) 1)))
+        (put-text-property open (1+ open) 'syntax-table '(7 . ?\'))
+        (put-text-property close (1+ close) 'syntax-table '(7 . ?\'))))))
+
+(defun haskell-tng-syntax:propertize-escapes (start end)
+  "Backslash inside String is an escape character."
+  (save-excursion
+    (goto-char start)
+    (while (re-search-forward "\\\\" end t)
+      (when (nth 3 (syntax-ppss))
+        (put-text-property (- (point) 1) (point)
+                           'syntax-table '(9 . ?\\))))))
+
+(provide 'haskell-tng-syntax)
+;;; haskell-tng-syntax.el ends here