emacs/emacs-lisp:我可以在交互表单之前插入建议吗?或者如何智能地预先设置编译命令?

一种选择是设置变量 compile-command 在模式挂钩中,类似于

(add-hook 'c++-mode-hook 'my-c++-set-compile-command)
(defun my-c++-set-compile-command ()
   (setq (make-local-variable 'compile-command) (format "gmake %s" (buffer-file-name))))

我有时会添加专门的命令来调整当前的编译行(打开/关闭调试标志、优化标志等),然后将这些命令绑定到迷你缓冲区中方便的击键。

关于在 interactive 形式上,你需要提出建议(无论是在前面还是周围),其中 有 您需要的交互式表单。来自advice.el库的示例:

;;(defadvice switch-to-buffer (around confirm-non-existing-buffers activate)
;;  "Switch to non-existing buffers only upon confirmation."
;;  (interactive "BSwitch to buffer: ")
;;  (if (or (get-buffer (ad-get-arg 0))
;;          (y-or-n-p (format "`%s' does not exist, create? " (ad-get-arg 0))))
;;      ad-do-it))

编译命令不必是字符串。compile函数会对其进行求值,因此它可以是返回特定于缓冲区或取决于一天中的时间的字符串的函数,等等:

(setq compile-command (lambda () (if (eq phase-of-moon 'waning) 
                                     "make -DWANING=1" 
                                    "make -DWANING=0")))

此外,尽管可能对您的特定需求不太有用,但您始终可以在文件变量部分定义compile命令:

/* -*- compile-command: "make -DFOO"; -*- */

或

// Local Variables:
// compile-command: "make -DSOMETHING_SPECIAL"
// End:

编译命令实际上用作 the manual .

啊,你知道我做了什么吗?我使用了一种倾斜的策略。

我已将C-XC-E全局设置为 compile . 我定义了一个函数来包装 编译 ,然后将c-xc-e绑定到 那个 . 在包装器中,我对compile命令进行了猜测。

(defun cheeso-invoke-compile-interactively ()
  "fn to wrap the `compile' function.  This simply
checks to see if `compile-command' has been previously guessed, and
if not, invokes `cheeso-guess-compile-command' to set the value.
Then it invokes the `compile' function, interactively."
  (interactive)
  (cond
   ((not (boundp 'cheeso-local-compile-command-has-been-set))
(cheeso-guess-compile-command)
(set (make-local-variable 'cheeso-local-compile-command-has-been-set) t)))
  ;; local compile command has now been set
  (call-interactively 'compile))

猜测函数是这样的:

(defun cheeso-guess-compile-command ()
  "set `compile-command' intelligently depending on the
current buffer, or the contents of the current directory."
  (interactive)
  (set (make-local-variable 'compile-command)
   (cond
    ((or (file-expand-wildcards "*.csproj" t)
     (file-expand-wildcards "*.vcproj" t)
     (file-expand-wildcards "*.vbproj" t)
     (file-expand-wildcards "*.shfbproj" t)
     (file-expand-wildcards "*.sln" t))
     "msbuild ")

    ;; sometimes, not sure why, the buffer-file-name is
    ;; not set.  Can use it only if set.
    (buffer-file-name
     (let ((filename (file-name-nondirectory buffer-file-name)))
       (cond

    ;; editing a .wxs (WIX Soluition) file
    ((string-equal (substring buffer-file-name -4) ".wxs")
     (concat "nmake "
         ;; (substring buffer-file-name 0 -4) ;; includes full path
         (file-name-sans-extension filename)
         ".msi" ))

    ;; a javascript file - run jslint
    ((string-equal (substring buffer-file-name -3) ".js")
     (concat (getenv "windir")
         "\\system32\\cscript.exe c:\\cheeso\\bin\\jslint-for-wsh.js "
         filename))

    ;; something else - do a typical .exe build
    (t
     (concat "nmake "
         (file-name-sans-extension filename)
         ".exe")))))

    (t
     "nmake "))))

下面是我使用的一些代码,它智能地选择了 University of Wyoming . 我目前已经为 C, C++ 和 Fortran . 您可以添加更多以满足您的需求。如果我打开一个程序 C++ 扩展和我执行 M—X 编译 ,我的编译命令发出 g++ -Wall currentfilename.cpp -o currentfilename -std=c++14 . 我就得打了 进入 .

;; M-x compile smarter in order to guess language
(require 'compile)
(defvar compile-guess-command-table
  '((c-mode       . "gcc -Wall -g %s -o %s -lm")
    (c++-mode     . "g++ -Wall %s -o %s -std=c++14")
    (fortran-mode . "gfortran -C %s -o %s")
    ))

(defun compile-guess-command ()
  (let ((command-for-mode (cdr (assq major-mode
                                     compile-guess-command-table))))
    (if (and command-for-mode
             (stringp buffer-file-name))
        (let* ((file-name (file-name-nondirectory buffer-file-name))
               (file-name-sans-suffix (if (and (string-match "\\.[^.]*\\'"
                                                             file-name)
                                               (> (match-beginning 0) 0))
                                          (substring file-name
                                                     0 (match-beginning 0))
                                        nil)))
          (if file-name-sans-suffix
              (progn
                (make-local-variable 'compile-command)
                (setq compile-command
                      (if (stringp command-for-mode)
                          ;; Optimize the common case.
                          (format command-for-mode
                                  file-name file-name-sans-suffix)
                        (funcall command-for-mode
                                 file-name file-name-sans-suffix)))
                compile-command)
            nil))
      nil)))


;; Add the appropriate mode hooks.
(add-hook 'c-mode-hook       (function compile-guess-command))
(add-hook 'c++-mode-hook     (function compile-guess-command))
(add-hook 'fortran-mode-hook (function compile-guess-command))

根据手册,您只需在建议中包含一个交互式表单,就可以用自己的表单覆盖函数的交互式表单。我认为您不能修改或包装现有的交互表单,只能完全覆盖它。

http://www.gnu.org/software/emacs/manual/html_node/elisp/Defining-Advice.html