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;;; c-conf.el --- configurations for C-mode -*- lexical-binding: t; -*-
;; Copyright (C) 2021 李俊緯
;; Author: Durand <mmemmew@gmail.com>
;; Keywords: c, convenience, languages
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; My configurations for editing C files.
;;; Code:
(setq c-macro-preprocessor "gcc -E -C -o - -")
;; We can achieve the functionality of the original binding
;; comment-region by comment-dwim bound to "M-;".
(define-key c-mode-map (vector 3 3) #'compile)
;; This proves to be too convenient not to bind.
(define-key c-mode-map (vector 'S-tab) #'ff-find-other-file)
;;; prefix map
(defvar durand-c-prefix-map '(keymap)
"The keymap of my custom functions.
This will be bound to the key ù.")
(let ((map durand-c-prefix-map))
(define-key map (vector ?i) #'durand-c-include)
(define-key map (vector ?p) #'c-generate-pragma))
;; generate pragmas automatically.
(define-key c-mode-map (vector ?ù) durand-c-prefix-map)
;;;###autoload
(defun c-generate-pragma ()
"Generate default pragmas for a C header file.
If invoked on a C file, include the corresponding header file."
(interactive)
(cond
((not (derived-mode-p 'c-mode 'c++-mode)))
((string-match-p "hp*$"(buffer-name))
(insert "#ifndef ")
(insert (replace-regexp-in-string
"\\." "_"
(upcase
(file-name-nondirectory
(buffer-file-name)))))
(newline)
(insert "#define ")
(insert (replace-regexp-in-string
"\\." "_"
(upcase
(file-name-nondirectory
(buffer-file-name)))))
(newline 2)
(insert "#endif")
(forward-line -1))
(t
(insert (format "#include \"%s\""
(replace-regexp-in-string
"c\\(p*\\)$" "h\\1" (buffer-name))))
(newline))))
;;;###autoload
(defun durand-c-include (&optional arg)
"Include a library.
If ARG is non-nil, ask for the type of the include: whether the
angle bracket type or the quote type."
(interactive)
(let* ((library (read-string "Include: "))
(type (cond
((null arg)
(cond
((string-match-p "^\\(std\\|string.h\\)" library)
'angle)
('quote)))
(t
(intern
(completing-read "Which type? "
'("angle" "quote")
nil t))))))
(save-restriction
(widen)
(save-excursion
(goto-char (point-min))
(re-search-forward "^#include" nil t)
(forward-line 0)
(insert "#include "
(cond ((eq type 'angle) "<")
((eq type 'quote) "\""))
library
(cond ((eq type 'angle) ">")
((eq type 'quote) "\""))
"\n")))))
(provide 'c-conf)
;;; c-conf.el ends here
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