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;;; eshell-fringe-status.el --- Show last status in fringe -*- lexical-binding: t; -*-
;; Copyright (C) 2014 Tom Willemse
;; Author: Tom Willemse <tom@ryuslash.org>
;; Keywords:
;; Version: 0.1.0
;; URL: http://projects.ryuslash.org/eshell-fringe-status/
;; 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/>.
;;; Commentary:
;; Show an indicator of the status of the last command run in eshell.
;; To use, enable `eshell-fringe-status-mode' in `eshell-mode'. The
;; easiest way to do this is by adding a hook:
;; : (add-hook 'eshell-mode-hook #'eshell-fringe-status-mode)
;; This mode uses a rather hackish way to try and keep everything
;; working in regard to `eshell-prompt-regexp', so if anything breaks
;; please let me know.
;; Some extra fringe bitmaps are provided. In case you prefer either
;; or both of them over the default arrow bitmap. These are
;; `efs-plus-bitmap' and `efs-minus-bitmap'. These show a `+' and `-'
;; in the fringe respectively, instead of an arrow. These can be used
;; by setting the `eshell-fringe-status-success-bitmap' and the
;; `eshell-fringe-status-failure-map' options.
;;; Code:
(require 'em-prompt)
(defgroup eshell-fringe-status
nil
"Settings for command exit status shown in Emacs' fringe."
:group 'eshell
:prefix "eshell-fringe")
(defcustom eshell-fringe-status-success-bitmap 'efs-arrow-bitmap
"The fringe bitmap to use when indicating a succesfull operation.
In combination with the `eshell-fringe-status-success' face this
determines the look of the fringe indicator."
:group 'eshell-fringe-status
:type 'symbol)
(defcustom eshell-fringe-status-failure-bitmap 'efs-arrow-bitmap
"The fringe bitmap to use when indicating a failed operation.
In combination with the `eshell-fringe-status-failure' face this
determines the look of the fringe indicator."
:group 'eshell-fringe-status
:type 'symbol)
(defface eshell-fringe-status-success
'((t (:foreground "#00ff00")))
"Face used to indicate success status.
In combination with the `eshell-fringe-status-success-bitmap'
this determines the look of the fringe indicator."
:group 'eshell-fringe-status)
(defface eshell-fringe-status-failure
'((t (:foreground "#ff0000")))
"Face used to indicate failed status.
In combination withh the `eshell-fringe-status-failure-bitmap'
this determines the look of the fringe indicator."
:group 'eshell-fringe-status)
(define-fringe-bitmap 'efs-arrow-bitmap
[#b10000
#b11000
#b11100
#b11110
#b11111
#b11110
#b11100
#b11000
#b10000] 9 5 'center)
(define-fringe-bitmap 'efs-plus-bitmap
[#b001100
#b001100
#b111111
#b111111
#b001100
#b001100] 6 6 'center)
(define-fringe-bitmap 'efs-minus-bitmap
[#b111111
#b111111] 2 6 'center)
;; efs--depending on command (status)
(defsubst efs--doc (a b)
"Depending on the `eshell-last-command-status' use either A or B."
(if (zerop eshell-last-command-status) a b))
(defun efs--extend-prompt-regexp ()
"Add a space at the beginning of `eshell-prompt-regexp'.
Since the fringe bitmap is added as a space with a special
display value, any existing regexp in `eshell-prompt-regexp'
which doesn't accept at least one space will break."
(let ((first (aref eshell-prompt-regexp 0)))
(when (eql first ?^)
(setq eshell-prompt-regexp
(format "%c ?%s" first (substring eshell-prompt-regexp 1))))))
(defun efs--propertized-text ()
"Return the propertized text to insert into the eshell bufffer."
(let ((face (efs--doc 'eshell-fringe-status-success
'eshell-fringe-status-failure))
(bitmap (efs--doc eshell-fringe-status-success-bitmap
eshell-fringe-status-failure-bitmap)))
(propertize " " 'display `((left-fringe ,bitmap ,face)))))
(defun efs--revert-prompt-regexp ()
"The counterpart for `efs--extend-prompt-regexp', remove a space.
Since when the mode is started a space is added to the beginning
of `eshell-prompt-regexp' it should also be removed when
disabling the mode."
(let ((first (aref eshell-prompt-regexp 0)))
(when (and (eql first ?^)
(eql (aref eshell-prompt-regexp 1) ?\s))
(setq eshell-prompt-regexp
(format "%c%s" first (substring eshell-prompt-regexp 3))))))
(defun eshell-fringe-status ()
"Display an indication of the last command's exit status.
This indication is shown as a bitmap in the left fringe of the
window."
(when eshell-last-command-name
(save-excursion
(beginning-of-line)
(let ((inhibit-read-only t))
(insert (efs--propertized-text))))))
;;;###autoload
(define-minor-mode eshell-fringe-status-mode
"Show exit status of last command in fringe."
nil nil nil
(if eshell-fringe-status-mode
(progn
(efs--extend-prompt-regexp)
(add-hook 'eshell-after-prompt-hook
#'eshell-fringe-status nil :local))
(efs--revert-prompt-regexp)
(remove-hook 'eshell-after-prompt-hook
#'eshell-fringe-status :local)))
(provide 'eshell-fringe-status)
;;; eshell-fringe-status.el ends here
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