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131 lines
4.4 KiB
131 lines
4.4 KiB
;;; go-complete.el --- Native code completion for Go
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;; Copyright (C) 2015 Vibhav Pant
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;; Author: Vibhav Pant <vibhavp@gmail.com>
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;; Version: 1.0
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;; Package-Version: 20151015.228
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;; Package-Requires: ((go-mode "0") (cl-lib "0.5"))
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;; Keywords: go, golang, completion
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;; URL: https://github.com/vibhavp/go-complete
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;;; Commentary:
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;; This package provides native code completion for the Go Programming
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;; Language.
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;; To enable, ad the following code into your .emacs:
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;; (require 'go-complete)
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;; (add-hook 'completion-at-point-functions 'go-complete-at-point)
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;; You need to have gocode (https://github.com/nsf/gocode) installed to use
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;; this package.
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;;; License:
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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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(defcustom go-complete-gocode-command "gocode"
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"The command to invoke `gocode'."
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:group 'go-completion
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:type 'string)
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(defun go-complete-run-gocode ()
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"Run gocode on the current point, return a buffer containing the output."
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(let ((temp-buffer (generate-new-buffer "*gocode*")))
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(if (buffer-modified-p)
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(call-process-region (point-min)
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(point-max)
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go-complete-gocode-command
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nil
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temp-buffer
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nil
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"-f=emacs"
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"autocomplete"
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(concat "c" (int-to-string (- (point) 1))))
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(call-process-region
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(point-min)
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(point-min)
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"gocode"
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nil
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temp-buffer
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nil
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"-f=emacs"
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(format "--in=%s" buffer-file-name)
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"autocomplete"
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(concat "c" (int-to-string (- (point) 1)))))
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temp-buffer))
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(defun go-complete-char-at (string index)
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"Return the character in STRING at index INDEX."
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(substring string index (+ index 1)))
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(defun go-complete-args-commas (string)
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"STRING is a function completion returned by gocode.
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Return a string in the format foo(,,), where foo is the function
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name, and the number of commas = number of arguments taken by the function"
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(let ((index (string-match ",,func(" string))
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(args 0))
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(unless (or (eq index nil) (string= (go-complete-char-at string (+ index 1)) ")"))
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(cl-incf index 2)
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(while (and (not (eq index (- (length string) 1))) (not (string= (go-complete-char-at string index) ")")))
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(when (string= (go-complete-char-at string index) ",")
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(cl-incf args))
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(cl-incf index))
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(format "(%s)" (make-string args ?,)))))
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(defun go-complete-make-completion (string)
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"Take a completion STRING from gocode, return a completion string.
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If STRING is a function completion, return foo(,,), where foo is the function
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name, and the number of commas = number of arguments taken by the function"
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(format "%s%s"
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(substring string 0 (string-match "," string))
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(if (string-match ",,func(" string) (go-complete-args-commas string) "")))
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(defun go-complete-make-completion-list (buffer)
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"Take a BUFFER containing gocode output, return a list of completions.
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The list returned is compatible with `completion-at-point-functions'"
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(with-current-buffer buffer
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(goto-char (point-min))
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(let ((completion-list '()))
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(while (not (eq (point) (point-max)))
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(setq completion-list
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(append completion-list (list (go-complete-make-completion
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(buffer-substring
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(line-beginning-position)
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(line-end-position))))))
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(forward-line))
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(kill-buffer buffer)
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completion-list)))
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;;;###autoload
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(defun go-complete-at-point ()
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"Complete go expression at point."
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(interactive)
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(when (derived-mode-p 'go-mode)
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(let ((token (current-word t))
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(completing-field (string= "." (buffer-substring
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(- (point) 1) (point)))))
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(when (or token completing-field)
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(list
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(if completing-field
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(point)
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(save-excursion (left-word) (point)))
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(point)
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(go-complete-make-completion-list (go-complete-run-gocode))
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.
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nil)))))
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(provide 'go-complete)
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;;; go-complete.el ends here
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