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;;; -*- lexical-binding: t -*-
;;; w3m-haddock.el --- Make browsing haddocks with w3m-mode better.
;; Copyright (C) 2014 Chris Done
;; Author: Chris Done <chrisdone@gmail.com>
;; This file is not part of GNU Emacs.
;; This file 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, or (at your option)
;; any later version.
;; This file 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 GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
(require 'cl-lib)
(require 'haskell-mode)
(require 'haskell-font-lock)
(declare-function w3m-buffer-title "ext:w3m")
(declare-function w3m-browse-url "ext:w3m")
(defvar w3m-current-url)
(add-hook 'w3m-display-hook 'w3m-haddock-display)
;;;###autoload
(defface w3m-haddock-heading-face
'((((class color)) :inherit highlight))
"Face for quarantines."
:group 'haskell)
(defcustom haskell-w3m-haddock-dirs
'("~/.cabal/share/doc/")
"The path to your cabal documentation dir. It should contain
directories of package-name-x.x.
You can rebind this if you're using hsenv by adding it to your
.dir-locals.el in your project root. E.g.
((haskell-mode . ((haskell-w3m-haddock-dirs . (\"/home/chris/Projects/foobar/.hsenv/cabal/share/doc\")))))
"
:group 'haskell
:type 'list)
(defvar w3m-haddock-entry-regex "^\\(\\(data\\|type\\) \\|[a-z].* :: \\)"
"Regex to match entry headings.")
(defun haskell-w3m-open-haddock ()
"Open a haddock page in w3m."
(interactive)
(let* ((entries (cl-remove-if (lambda (s) (string= s ""))
(apply 'append (mapcar (lambda (dir)
(split-string (shell-command-to-string (concat "ls -1 " dir))
"\n"))
haskell-w3m-haddock-dirs))))
(package-dir (ido-completing-read
"Package: "
entries)))
(cond
((member package-dir entries)
(unless (cl-loop for dir in haskell-w3m-haddock-dirs
when (w3m-haddock-find-index dir package-dir)
do (progn (w3m-browse-url (w3m-haddock-find-index dir package-dir)
t)
(cl-return t)))
(w3m-browse-url (concat "http://hackage.haskell.org/package/"
package-dir)
t)))
(t
(w3m-browse-url (concat "http://hackage.haskell.org/package/"
package-dir)
t)))))
(defun w3m-haddock-find-index (dir package)
(let ((html-index (concat dir "/" package "/html/index.html"))
(index (concat dir "/" package "/index.html")))
(cond
((file-exists-p html-index)
html-index)
((file-exists-p index)
index))))
(defun w3m-haddock-page-p ()
"Haddock general page?"
(save-excursion
(goto-char (point-max))
(forward-line -2)
(looking-at "[ ]*Produced by Haddock")))
(defun w3m-haddock-source-p ()
"Haddock source page?"
(save-excursion
(goto-char (point-min))
(or (looking-at "Location: https?://hackage.haskell.org/package/.*/docs/src/")
(looking-at "Location: file://.*cabal/share/doc/.*/html/src/")
(looking-at "Location: .*src/.*.html$"))))
(defun w3m-haddock-p ()
"Any haddock page?"
(or (w3m-haddock-page-p)
(w3m-haddock-source-p)))
(defun w3m-haddock-find-tag ()
"Find a tag by jumping to the \"All\" index and doing a
search-forward."
(interactive)
(when (w3m-haddock-p)
(let ((ident (haskell-ident-at-point)))
(when ident
(w3m-browse-url
(replace-regexp-in-string "docs/.*" "docs/doc-index-All.html" w3m-current-url))
(search-forward ident)))))
(defun w3m-haddock-display (_url)
"To be run by w3m's display hook. This takes a normal w3m
buffer containing hadddock documentation and reformats it to be
more usable and look like a dedicated documentation page."
(when (w3m-haddock-page-p)
(save-excursion
(goto-char (point-min))
(let ((inhibit-read-only t))
(delete-region (point)
(line-end-position))
(w3m-haddock-next-heading)
;; Start formatting entries
(while (looking-at w3m-haddock-entry-regex)
(when (w3m-haddock-valid-heading)
(w3m-haddock-format-heading))
(w3m-haddock-next-heading))))
(rename-buffer (concat "*haddock: " (w3m-buffer-title (current-buffer)) "*")))
(when (w3m-haddock-source-p)
(font-lock-mode -1)
(let ((n (line-number-at-pos)))
(save-excursion
(goto-char (point-min))
(forward-line 1)
(let ((text (buffer-substring (point)
(point-max)))
(inhibit-read-only t))
(delete-region (point)
(point-max))
(insert
(haskell-fontify-as-mode text
'haskell-mode))))
(goto-char (point-min))
(forward-line (1- n)))))
(defun w3m-haddock-format-heading ()
"Format a haddock entry."
(let ((o (make-overlay (line-beginning-position)
(1- (save-excursion (w3m-haddock-header-end))))))
(overlay-put o 'face 'w3m-haddock-heading-face))
(let ((end (save-excursion
(w3m-haddock-next-heading)
(when (w3m-haddock-valid-heading)
(point)))))
(when end
(save-excursion
(w3m-haddock-header-end)
(indent-rigidly (point)
end
4)))))
(defun w3m-haddock-next-heading ()
"Go to the next heading, or end of the buffer."
(forward-line 1)
(or (search-forward-regexp w3m-haddock-entry-regex nil t 1)
(goto-char (point-max)))
(goto-char (line-beginning-position)))
(defun w3m-haddock-valid-heading ()
"Is this a valid heading?"
(not (get-text-property (point) 'face)))
(defun w3m-haddock-header-end ()
"Go to the end of the header."
(search-forward-regexp "\n[ \n]"))
(provide 'w3m-haddock)
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