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;;; helm-man.el --- Man and woman UI -*- lexical-binding: t -*-
;; Copyright (C) 2012 ~ 2017 Thierry Volpiatto <thierry.volpiatto@gmail.com>
;; 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/>.
;;; Code:
(require 'cl-lib)
(require 'helm)
(require 'helm-help)
(defvar woman-topic-all-completions)
(defvar woman-manpath)
(defvar woman-path)
(defvar woman-expanded-directory-path)
(declare-function woman-file-name "woman.el" (topic &optional re-cache))
(declare-function woman-file-name-all-completions "woman.el" (topic))
(declare-function Man-getpage-in-background "man.el" (topic))
(declare-function woman-expand-directory-path "woman.el" (path-dirs path-regexps))
(declare-function woman-topic-all-completions "woman.el" (path))
(declare-function helm-generic-sort-fn "helm-utils.el" (S1 S2))
(defgroup helm-man nil
"Man and Woman applications for helm."
:group 'helm)
(defcustom helm-man-or-woman-function 'Man-getpage-in-background
"Default command to display a man page."
:group 'helm-man
:type '(radio :tag "Preferred command to display a man page"
(const :tag "Man" Man-getpage-in-background)
(const :tag "Woman" woman)))
(defcustom helm-man-format-switches "-l %s"
"Arguments to pass to the `manual-entry' function.
Arguments are passed to `manual-entry' with `format.'
Default use \"-l\" which may not be supported on old man versions,
in this case use \"%s\" as value to pass only the filename as argument.
See Issue #1035"
:group 'helm-man
:type 'string)
;; Internal
(defvar helm-man--pages nil
"All man pages on system.
Will be calculated the first time you invoke helm with this
source.")
(defun helm-man-default-action (candidate)
"Default action for jumping to a woman or man page from helm."
(let ((wfiles (mapcar
'car (woman-file-name-all-completions candidate))))
(condition-case nil
(if (> (length wfiles) 1)
(let ((file (helm-comp-read
"ManFile: " wfiles :must-match t)))
(if (eq helm-man-or-woman-function 'Man-getpage-in-background)
(manual-entry (format helm-man-format-switches file))
(woman-find-file file)))
(funcall helm-man-or-woman-function candidate))
;; If woman is unable to format correctly
;; use man instead.
(error (kill-buffer) ; Kill woman buffer.
(Man-getpage-in-background candidate)))))
(defun helm-man--init ()
(require 'woman)
(require 'helm-utils)
(unless helm-man--pages
(setq woman-expanded-directory-path
(woman-expand-directory-path woman-manpath woman-path))
(setq woman-topic-all-completions
(woman-topic-all-completions woman-expanded-directory-path))
(setq helm-man--pages (mapcar 'car woman-topic-all-completions)))
(helm-init-candidates-in-buffer 'global helm-man--pages))
(defvar helm-source-man-pages
(helm-build-in-buffer-source "Manual Pages"
:init #'helm-man--init
:persistent-action #'ignore
:filtered-candidate-transformer
(lambda (candidates _source)
(sort candidates #'helm-generic-sort-fn))
:action '(("Display Man page" . helm-man-default-action))))
;;;###autoload
(defun helm-man-woman (arg)
"Preconfigured `helm' for Man and Woman pages.
With a prefix arg reinitialize the cache."
(interactive "P")
(when arg (setq helm-man--pages nil))
(helm :sources 'helm-source-man-pages
:buffer "*helm man woman*"))
(provide 'helm-man)
;; Local Variables:
;; byte-compile-warnings: (not obsolete)
;; coding: utf-8
;; indent-tabs-mode: nil
;; End:
;;; helm-man.el ends here
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