;;; helm-adaptive.el --- Adaptive Sorting of Candidates. -*- lexical-binding: t -*-
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;; Original Author: Tamas Patrovics
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;; Copyright (C) 2007 Tamas Patrovics
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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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(defgroup helm-adapt nil
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"Adaptative sorting of candidates for Helm."
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:group 'helm)
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(defcustom helm-adaptive-history-file
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"~/.emacs.d/helm-adaptive-history"
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"Path of file where history information is stored.
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When nil history is not saved nor restored after emacs restart unless
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you save/restore `helm-adaptive-history' with something else like
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psession or desktop."
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:type 'string
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:group 'helm-adapt)
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(defcustom helm-adaptive-history-length 50
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"Maximum number of candidates stored for a source."
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:type 'number
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:group 'helm-adapt)
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(defcustom helm-adaptive-sort-by-frequent-recent-usage t
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"Try to sort on an average of frequent and recent usage when non-nil.
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When nil sort on frequency usage only.
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Only frequency:
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When candidate have low frequency, you have to hit on it many times to
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make it going up on top.
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Frequency+recent:
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Even with a low frequency, candidate go up on top. If a candidate
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have a high frequency but it is not used since some time, it goes
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down slowly, but as soon you reuse it it go up on top quickly."
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:group 'helm-adapt
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:type 'boolean)
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;; Internal
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(defvar helm-adaptive-done nil
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"nil if history information is not yet stored for the current
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selection.")
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(defvar helm-adaptive-history nil
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"Contains the stored history information.
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Format: ((SOURCE-NAME (SELECTED-CANDIDATE (PATTERN . NUMBER-OF-USE) ...) ...) ...)")
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(defconst helm-adaptive-freq-coefficient 5)
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(defconst helm-adaptive-recent-coefficient 2)
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(defun helm-adaptive-done-reset ()
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(setq helm-adaptive-done nil))
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;;;###autoload
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(define-minor-mode helm-adaptive-mode
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"Toggle adaptive sorting in all sources."
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:group 'helm-adapt
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:require 'helm-adaptive
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:global t
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(if helm-adaptive-mode
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(progn
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(unless helm-adaptive-history
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(helm-adaptive-maybe-load-history))
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(add-hook 'kill-emacs-hook 'helm-adaptive-save-history)
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;; Should run at beginning of `helm-initial-setup'.
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(add-hook 'helm-before-initialize-hook 'helm-adaptive-done-reset)
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;; Should run at beginning of `helm-exit-minibuffer'.
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(add-hook 'helm-before-action-hook 'helm-adaptive-store-selection)
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;; Should run at beginning of `helm-select-action'.
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(add-hook 'helm-select-action-hook 'helm-adaptive-store-selection))
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(helm-adaptive-save-history)
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(setq helm-adaptive-history nil)
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(remove-hook 'kill-emacs-hook 'helm-adaptive-save-history)
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(remove-hook 'helm-before-initialize-hook 'helm-adaptive-done-reset)
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(remove-hook 'helm-before-action-hook 'helm-adaptive-store-selection)
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(remove-hook 'helm-select-action-hook 'helm-adaptive-store-selection)))
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(defun helm-adapt-use-adaptive-p (&optional source-name)
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"Return current source only if it use adaptive history, nil otherwise."
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(when helm-adaptive-mode
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(let* ((source (or source-name (helm-get-current-source)))
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(adapt-source (or (assoc-default 'filtered-candidate-transformer source)
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(assoc-default 'candidate-transformer source))))
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(if (listp adapt-source)
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(and (memq 'helm-adaptive-sort adapt-source) source)
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(and (eq adapt-source 'helm-adaptive-sort) source)))))
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(defun helm-adaptive-store-selection ()
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"Store history information for the selected candidate."
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(unless helm-adaptive-done
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(setq helm-adaptive-done t)
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(let ((source (helm-adapt-use-adaptive-p)))
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(when source
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(let* ((source-name (assoc-default 'name source))
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(source-info (or (assoc source-name helm-adaptive-history)
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(progn
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(push (list source-name) helm-adaptive-history)
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(car helm-adaptive-history))))
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(selection (helm-get-selection nil t))
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(selection-info (progn
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(setcdr source-info
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(cons
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(let ((found (assoc selection (cdr source-info))))
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(if (not found)
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;; new entry
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(list selection)
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;; move entry to the beginning of the
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;; list, so that it doesn't get
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;; trimmed when the history is
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;; truncated
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(setcdr source-info
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(delete found (cdr source-info)))
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found))
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(cdr source-info)))
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(cadr source-info)))
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(pattern-info (progn
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(setcdr selection-info
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(cons
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(let ((found (assoc helm-pattern (cdr selection-info))))
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(if (not found)
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;; new entry
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(cons helm-pattern 0)
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;; move entry to the beginning of the
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;; list, so if two patterns used the
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;; same number of times then the one
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;; used last appears first in the list
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(setcdr selection-info
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(delete found (cdr selection-info)))
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found))
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(cdr selection-info)))
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(cadr selection-info)))
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(timestamp-info (helm-aif (assq 'timestamp (cdr selection-info))
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it
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(setcdr selection-info (cons (cons 'timestamp 0) (cdr selection-info)))
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(cadr selection-info))))
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;; Increase usage count.
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(setcdr pattern-info (1+ (cdr pattern-info)))
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;; Update timestamp.
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(setcdr timestamp-info (float-time))
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;; Truncate history if needed.
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(if (> (length (cdr selection-info)) helm-adaptive-history-length)
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(setcdr selection-info
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(cl-subseq (cdr selection-info) 0 helm-adaptive-history-length))))))))
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(defun helm-adaptive-maybe-load-history ()
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"Load `helm-adaptive-history-file' which contain `helm-adaptive-history'.
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Returns nil if `helm-adaptive-history-file' doesn't exist."
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(when (and helm-adaptive-history-file
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(file-readable-p helm-adaptive-history-file))
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(load-file helm-adaptive-history-file)))
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(defun helm-adaptive-save-history (&optional arg)
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"Save history information to file given by `helm-adaptive-history-file'."
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(interactive "p")
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(when helm-adaptive-history-file
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(with-temp-buffer
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(insert
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";; -*- mode: emacs-lisp -*-\n"
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";; History entries used for helm adaptive display.\n")
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(let (print-length print-level)
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(prin1 `(setq helm-adaptive-history ',helm-adaptive-history)
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(current-buffer)))
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(insert ?\n)
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(write-region (point-min) (point-max) helm-adaptive-history-file nil
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(unless arg 'quiet)))))
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(defun helm-adaptive-sort (candidates source)
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"Sort the CANDIDATES for SOURCE by usage frequency.
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This is a filtered candidate transformer you can use with the
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`filtered-candidate-transformer' attribute."
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(let* ((source-name (assoc-default 'name source))
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(source-info (assoc source-name helm-adaptive-history)))
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(if source-info
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(let ((usage
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;; Loop in the SOURCE entry of `helm-adaptive-history'
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;; and assemble a list containing the (CANDIDATE
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;; . USAGE-COUNT) pairs.
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(cl-loop with cf = (if helm-adaptive-sort-by-frequent-recent-usage
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helm-adaptive-freq-coefficient 1)
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with cr = helm-adaptive-recent-coefficient
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for (src-cand . infos) in (cdr source-info)
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for count-freq = 0
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for count-rec =
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(helm-aif (and helm-adaptive-sort-by-frequent-recent-usage
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(assq 'timestamp infos))
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(* cr (+ (float-time) (cdr it)))
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0)
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do (cl-loop for (pattern . score) in
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(remove (assq 'timestamp infos) infos)
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;; If current pattern is equal to
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;; the previously used one then
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;; this candidate has priority
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;; (that's why its count-freq is
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;; boosted by 10000) and it only
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;; has to compete with other
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;; candidates which were also
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;; selected with the same pattern.
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if (equal pattern helm-pattern)
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return (setq count-freq (+ 10000 score))
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else do (cl-incf count-freq score))
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and collect (cons src-cand (+ (* count-freq cf) count-rec))
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into results
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;; Sort the list in descending order, so
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;; candidates with highest priority come
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;; first.
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finally return
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(sort results (lambda (first second)
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(> (cdr first) (cdr second)))))))
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(if (consp usage)
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;; Put those candidates first which have the highest usage count.
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(cl-loop for (cand . _freq) in usage
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for info = (or (and (assq 'multiline source)
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(replace-regexp-in-string
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"\n\\'" "" cand))
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cand)
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when (cl-member info candidates
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:test 'helm-adaptive-compare)
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collect (car it) into sorted
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and do (setq candidates
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(cl-remove info candidates
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:test 'helm-adaptive-compare))
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finally return (append sorted candidates))
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(message "Your `%s' is maybe corrupted or too old, \
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you should reinitialize it with `helm-reset-adaptive-history'"
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helm-adaptive-history-file)
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(sit-for 1)
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candidates))
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;; if there is no information stored for this source then do nothing
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candidates)))
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;;;###autoload
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(defun helm-reset-adaptive-history ()
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"Delete all `helm-adaptive-history' and his file.
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Useful when you have a old or corrupted `helm-adaptive-history-file'."
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(interactive)
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(when (y-or-n-p "Really delete all your `helm-adaptive-history'? ")
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(setq helm-adaptive-history nil)
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(delete-file helm-adaptive-history-file)))
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(defun helm-adaptive-compare (x y)
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"Compare display parts if some of candidates X and Y.
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Arguments X and Y are cons cell in (DISPLAY . REAL) format or atoms."
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(equal (if (listp x) (car x) x)
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(if (listp y) (car y) y)))
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(provide 'helm-adaptive)
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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-adaptive.el ends here
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