;;; helm-man.el --- Man and woman UI -*- lexical-binding: t -*-
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;; Copyright (C) 2012 ~ 2018 Thierry Volpiatto <thierry.volpiatto@gmail.com>
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;; This program 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 of the License, or
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;; (at your option) any later version.
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;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Code:
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(require 'cl-lib)
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(require 'helm)
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(require 'helm-help)
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(defvar woman-topic-all-completions)
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(defvar woman-manpath)
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(defvar woman-path)
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(defvar woman-expanded-directory-path)
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(declare-function woman-file-name "woman.el" (topic &optional re-cache))
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(declare-function woman-file-name-all-completions "woman.el" (topic))
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(declare-function Man-getpage-in-background "man.el" (topic))
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(declare-function woman-expand-directory-path "woman.el" (path-dirs path-regexps))
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(declare-function woman-topic-all-completions "woman.el" (path))
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(declare-function helm-generic-sort-fn "helm-utils.el" (S1 S2))
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(defgroup helm-man nil
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"Man and Woman applications for helm."
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:group 'helm)
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(defcustom helm-man-or-woman-function 'Man-getpage-in-background
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"Default command to display a man page."
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:group 'helm-man
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:type '(radio :tag "Preferred command to display a man page"
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(const :tag "Man" Man-getpage-in-background)
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(const :tag "Woman" woman)))
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(defcustom helm-man-format-switches (cl-case system-type
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((darwin macos) "%s")
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(t "-l %s"))
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"Arguments to pass to the `manual-entry' function.
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Arguments are passed to `manual-entry' with `format.'"
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:group 'helm-man
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:type 'string)
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;; Internal
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(defvar helm-man--pages nil
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"All man pages on system.
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Will be calculated the first time you invoke helm with this
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source.")
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(defun helm-man-default-action (candidate)
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"Default action for jumping to a woman or man page from helm."
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(let ((wfiles (mapcar #'car (woman-file-name-all-completions candidate))))
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(condition-case nil
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(let ((file (if (cdr wfiles)
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(helm-comp-read "ManFile: " wfiles :must-match t)
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(car wfiles))))
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(if (eq helm-man-or-woman-function 'Man-getpage-in-background)
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(manual-entry (format helm-man-format-switches file))
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(condition-case nil
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(woman-find-file file)
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;; If woman is unable to format correctly
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;; try Man instead.
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(error (kill-buffer)
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(manual-entry (format helm-man-format-switches file))))))
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;; If even Man failed with file as argument, try again with Man
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;; but using Topic candidate instead of the file calculated by
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;; woman.
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(error (kill-buffer)
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(Man-getpage-in-background candidate)))))
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(defun helm-man--init ()
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(require 'woman)
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(require 'helm-utils)
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(unless helm-man--pages
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(setq woman-expanded-directory-path
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(woman-expand-directory-path woman-manpath woman-path))
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(setq woman-topic-all-completions
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(woman-topic-all-completions woman-expanded-directory-path))
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(setq helm-man--pages (mapcar 'car woman-topic-all-completions)))
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(helm-init-candidates-in-buffer 'global helm-man--pages))
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(defvar helm-source-man-pages
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(helm-build-in-buffer-source "Manual Pages"
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:init #'helm-man--init
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:persistent-action #'ignore
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:filtered-candidate-transformer
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(lambda (candidates _source)
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(sort candidates #'helm-generic-sort-fn))
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:action '(("Display Man page" . helm-man-default-action))
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:group 'helm-man))
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;;;###autoload
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(defun helm-man-woman (arg)
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"Preconfigured `helm' for Man and Woman pages.
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With a prefix arg reinitialize the cache."
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(interactive "P")
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(when arg (setq helm-man--pages nil))
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(helm :sources 'helm-source-man-pages
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:buffer "*helm man woman*"))
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(provide 'helm-man)
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;; Local Variables:
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;; byte-compile-warnings: (not obsolete)
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;; coding: utf-8
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;; indent-tabs-mode: nil
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;; End:
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;;; helm-man.el ends here
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