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190 lines
6.5 KiB
190 lines
6.5 KiB
;;; -*- lexical-binding: t -*-
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;;; w3m-haddock.el --- Make browsing haddocks with w3m-mode better.
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;; Copyright (C) 2014 Chris Done
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;; Author: Chris Done <chrisdone@gmail.com>
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;; This file is not part of GNU Emacs.
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;; This file is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3, or (at your option)
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;; any later version.
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;; This file is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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(require 'cl-lib)
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(require 'haskell-mode)
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(require 'haskell-font-lock)
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(declare-function w3m-buffer-title "ext:w3m")
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(declare-function w3m-browse-url "ext:w3m")
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(defvar w3m-current-url)
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(add-hook 'w3m-display-hook 'w3m-haddock-display)
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;;;###autoload
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(defface w3m-haddock-heading-face
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'((((class color)) :inherit highlight))
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"Face for quarantines."
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:group 'haskell)
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(defcustom haskell-w3m-haddock-dirs
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'("~/.cabal/share/doc/")
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"The path to your cabal documentation dir. It should contain
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directories of package-name-x.x.
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You can rebind this if you're using hsenv by adding it to your
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.dir-locals.el in your project root. E.g.
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((haskell-mode . ((haskell-w3m-haddock-dirs . (\"/home/chris/Projects/foobar/.hsenv/cabal/share/doc\")))))
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"
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:group 'haskell
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:type 'list)
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(defvar w3m-haddock-entry-regex "^\\(\\(data\\|type\\) \\|[a-z].* :: \\)"
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"Regex to match entry headings.")
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(defun haskell-w3m-open-haddock ()
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"Open a haddock page in w3m."
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(interactive)
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(let* ((entries (cl-remove-if (lambda (s) (string= s ""))
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(apply 'append (mapcar (lambda (dir)
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(split-string (shell-command-to-string (concat "ls -1 " dir))
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"\n"))
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haskell-w3m-haddock-dirs))))
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(package-dir (ido-completing-read
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"Package: "
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entries)))
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(cond
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((member package-dir entries)
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(unless (cl-loop for dir in haskell-w3m-haddock-dirs
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when (w3m-haddock-find-index dir package-dir)
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do (progn (w3m-browse-url (w3m-haddock-find-index dir package-dir)
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t)
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(cl-return t)))
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(w3m-browse-url (concat "http://hackage.haskell.org/package/"
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package-dir)
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t)))
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(t
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(w3m-browse-url (concat "http://hackage.haskell.org/package/"
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package-dir)
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t)))))
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(defun w3m-haddock-find-index (dir package)
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(let ((html-index (concat dir "/" package "/html/index.html"))
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(index (concat dir "/" package "/index.html")))
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(cond
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((file-exists-p html-index)
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html-index)
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((file-exists-p index)
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index))))
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(defun w3m-haddock-page-p ()
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"Haddock general page?"
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(save-excursion
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(goto-char (point-max))
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(forward-line -2)
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(looking-at "[ ]*Produced by Haddock")))
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(defun w3m-haddock-source-p ()
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"Haddock source page?"
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(save-excursion
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(goto-char (point-min))
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(or (looking-at "Location: https?://hackage.haskell.org/package/.*/docs/src/")
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(looking-at "Location: file://.*cabal/share/doc/.*/html/src/")
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(looking-at "Location: .*src/.*.html$"))))
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(defun w3m-haddock-p ()
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"Any haddock page?"
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(or (w3m-haddock-page-p)
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(w3m-haddock-source-p)))
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(defun w3m-haddock-find-tag ()
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"Find a tag by jumping to the \"All\" index and doing a
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search-forward."
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(interactive)
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(when (w3m-haddock-p)
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(let ((ident (haskell-ident-at-point)))
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(when ident
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(w3m-browse-url
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(replace-regexp-in-string "docs/.*" "docs/doc-index-All.html" w3m-current-url))
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(search-forward ident)))))
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(defun w3m-haddock-display (_url)
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"To be run by w3m's display hook. This takes a normal w3m
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buffer containing hadddock documentation and reformats it to be
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more usable and look like a dedicated documentation page."
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(when (w3m-haddock-page-p)
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(save-excursion
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(goto-char (point-min))
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(let ((inhibit-read-only t))
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(delete-region (point)
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(line-end-position))
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(w3m-haddock-next-heading)
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;; Start formatting entries
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(while (looking-at w3m-haddock-entry-regex)
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(when (w3m-haddock-valid-heading)
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(w3m-haddock-format-heading))
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(w3m-haddock-next-heading))))
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(rename-buffer (concat "*haddock: " (w3m-buffer-title (current-buffer)) "*")))
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(when (w3m-haddock-source-p)
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(font-lock-mode -1)
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(let ((n (line-number-at-pos)))
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(save-excursion
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(goto-char (point-min))
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(forward-line 1)
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(let ((text (buffer-substring (point)
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(point-max)))
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(inhibit-read-only t))
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(delete-region (point)
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(point-max))
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(insert
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(haskell-fontify-as-mode text
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'haskell-mode))))
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(goto-char (point-min))
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(forward-line (1- n)))))
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(defun w3m-haddock-format-heading ()
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"Format a haddock entry."
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(let ((o (make-overlay (line-beginning-position)
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(1- (save-excursion (w3m-haddock-header-end))))))
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(overlay-put o 'face 'w3m-haddock-heading-face))
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(let ((end (save-excursion
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(w3m-haddock-next-heading)
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(when (w3m-haddock-valid-heading)
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(point)))))
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(when end
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(save-excursion
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(w3m-haddock-header-end)
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(indent-rigidly (point)
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end
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4)))))
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(defun w3m-haddock-next-heading ()
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"Go to the next heading, or end of the buffer."
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(forward-line 1)
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(or (search-forward-regexp w3m-haddock-entry-regex nil t 1)
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(goto-char (point-max)))
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(goto-char (line-beginning-position)))
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(defun w3m-haddock-valid-heading ()
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"Is this a valid heading?"
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(not (get-text-property (point) 'face)))
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(defun w3m-haddock-header-end ()
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"Go to the end of the header."
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(search-forward-regexp "\n[ \n]"))
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(provide 'w3m-haddock)
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