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;;; fcomp.el --- fcomp front-end -*- lexical-binding: t; -*-
;; Copyright (C) 2019 Anastasis Grammenos
;; Author: Anastasis Grammenos <anastasis.gramm2@gmail.com>
;; Keywords: lisp
;; Version: 0.0.1
;; 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:
;; Emacs front-end for fcomp. Get it from https://ubuntos.dynu.net/git/fcomp
;;; Install:
;; git clone https://ubuntos.dynu.net/git/fcomp && cd fcomp
;; make && make install # install copies the binary under /usr/local/bin
;; In the emacs init file:
;; (add-to-list 'load-path "/your/custom/path")
;; (require 'fcomp)
;; (setq fcomp-path "/your/custom/path/fcomp")
;; (global-set-key (kbd "C-<tab>") 'fcomp-autocomplete)
;; or with use-package
;; (use-package fcomp
;; :load-path "/your/custom/path"
;; :bind (("C-<tab>" . fcomp-autocomplete))
;; :config
;; (setq fcomp-path "/your/custom/path/fcomp"))
;;; Code:
(require 'ido)
(require 'subr-x)
;; User variables
(defvar fcomp-path "/usr/local/bin/fcomp"
"Path to fcomp executable.")
(defvar fcomp-min-word-length 3
"Minimum word length to be counted as token.")
(defvar fcomp-extra-valid-chars ""
"Extra valid chars for the tokenization.")
(defvar fcomp-extra-invalid-chars ""
"Extra invalid chars for the tokenization.")
(defvar fcomp-completing-read-func 'completing-read
"Function to call when showing results to user.")
(defun empty-string-p (string)
"Return true if the string is empty or nil. Expects string."
(or (null string)
(zerop (length (string-trim string)))))
(defun fcomp--start (query)
"Initiaize fcomp variables"
(setq fcomp--query query)
(setq fcomp--output ""))
(defun fcomp--filter (proc str)
"Fill the output buffer"
(let* ((fcomp-pre
(if (empty-string-p (process-get proc 'input-word))
nil
(format "%s" (process-get proc 'input-word)))))
(setq fcomp--output (concat fcomp--output str))))
(defun fcomp--handle-output ()
"Handle output buffer"
(let ((initial-input fcomp--query)
(out-string fcomp--output)
(result nil))
(if (empty-string-p fcomp--output)
nil
(setq result
(funcall fcomp-completing-read-func
"Complete:"
(remove "" (split-string fcomp--output "\n"))
nil nil
initial-input)))
(if (empty-string-p result)
(message "%s" "No completion candidates")
(insert (string-remove-prefix
(if (empty-string-p initial-input)
(format "%s" "")
(format "%s" initial-input))
result)))
(setq fcomp--query "")
(setq fcomp--output "")))
(defun fcomp--autocomplete (word point &optional x)
"Start fcomp process and orchistrate it's output."
(let ((term (if (empty-string-p word)
(format "%s" "-au")
(format "%s" word)))
(input-len (buffer-size)))
(fcomp--start word)
(setq proc
(start-process
"fcomp"
nil
(format "%s" fcomp-path)
"-w" (format "%s" fcomp-min-word-length)
"-v" (format "\"%s\"" fcomp-extra-valid-chars)
"-i" (format "\"%s\"" fcomp-extra-invalid-chars)
term))
(set-process-filter proc #'fcomp--filter)
(set-process-coding-system proc 'raw-text-unix 'raw-text-unix)
(process-put proc 'input-word word)
(if (< input-len 50000)
(process-send-region proc (point-min) (point-max))
(process-send-region proc
(if (< (- point 25000) 0) (point-min) (- point 25000))
(if (> (+ point 25000) input-len) (point-max) (+ point 25000))))
(process-send-string proc "\n")
(process-send-eof proc)
(if (accept-process-output proc nil nil t)
(unless x
(fcomp--handle-output))
(progn
(unless x
(message "No completion for %s" word))
(delete-process proc)))))
(defun fcomp--make-syntax-table ()
"Modifies the current active sytanx table to include '_', '-'
and `fcomp-extra-valid-chars' as part of a word."
;; Thanks Dan for the syntax-table trick
;; https://emacs.stackexchange.com/questions/9583/how-to-treat-underscore-as-part-of-the-word
(let ((table (copy-syntax-table (syntax-table))))
(when (not (empty-string-p fcomp-extra-valid-chars))
(mapc (lambda (char) (modify-syntax-entry char "w" table)) fcomp-extra-valid-chars))
(modify-syntax-entry ?- "w" table)
(modify-syntax-entry ?_ "w" table)
(copy-syntax-table table)))
(defun fcomp-get-canditates (word)
"Return a list of candidates for WORD curated by fcomp."
(progn
(fcomp--autocomplete word (point) t))
(remove "" (split-string fcomp--output "\n")))
(defun fcomp-autocomplete ()
"Autocompete using fcomp.c
When `thing-at-point' is a word, autocomplete it based on buffer contents.
When invoked with no `thing-at-point' show a list of all possible candidates.
The syntax-table is temporarily modified and includes '_', '-' and
`fcomp-extra-valid-chars' as part of a word.
Requires fcomp. Get it at URL `https://git.eyesin.space/git/fcomp'"
(interactive)
(with-syntax-table (fcomp--make-syntax-table)
(fcomp--autocomplete (thing-at-point 'word 'no-properties) (point))))
(provide 'fcomp)
;;; fcomp.el ends here
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